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University of Johannesburg
1.
Krijnauw, Pieter.
Die skuifsterkte van gewapende beton.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/9263 
► M.Ing. (Civil Engineering)
The shear strength of a concrete structure is usually determined in practice in accordance with the applicable national concrete design code. Calculation…
(more)
▼ M.Ing. (Civil Engineering)
The shear strength of a concrete structure is usually determined in practice in accordance with the applicable national concrete design code. Calculation methods prescribed in national design codes differ from code to code and yield widely divergent results. The methods given for different cases in specific codes are often based on different approaches. Further, some of the methods do not agree with the observed behaviour during failure. This shows that there is a need for more accurate methods of determining shear strength, as well as approaches leading to universally applicable methods. A literature study was undertaken to establish whether such methods or approaches have already been developed. Special attention was given to the underlying mechanisms involved in shear resistance, to the shear resistance of concrete elements without shear reinforcement, of elements with varying depth, and of areas near points of contraflexure, and to punching resistance of flat slabs. A review of the latest research on the subject is given, and areas where further research is required, are identified.
Subjects/Keywords: Reinforced concrete.; Reinforced concrete construction.
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APA (6th Edition):
Krijnauw, P. (2014). Die skuifsterkte van gewapende beton. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9263
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Krijnauw, Pieter. “Die skuifsterkte van gewapende beton.” 2014. Thesis, University of Johannesburg. Accessed April 11, 2021.
http://hdl.handle.net/10210/9263.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Krijnauw, Pieter. “Die skuifsterkte van gewapende beton.” 2014. Web. 11 Apr 2021.
Vancouver:
Krijnauw P. Die skuifsterkte van gewapende beton. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10210/9263.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Krijnauw P. Die skuifsterkte van gewapende beton. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9263
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
2.
Shields, Silas A.
Assessing durability of reinforced concrete and ductile Iron.
Degree: MS, 2017, Oregon State University
URL: http://hdl.handle.net/1957/61656
► The first goal of this master’s thesis was to investigate the linkage between a non-destructive testing method, surface resistivity, and premature concrete deterioration brought on…
(more)
▼ The first goal of this master’s thesis was to investigate the linkage between a non-destructive testing method, surface resistivity, and premature
concrete deterioration brought on by chloride ingress and/or freeze-thaw cycling. The experimental method for this project consists of taking surface resistivity measurements of
reinforced concrete slabs after they were ponded with a magnesium chloride de-icing solution, containing a corrosion inhibitor.
Reinforced concrete slabs and companion
concrete cylinders also underwent freeze/thaw cycling to observe its effect on surface resistivity in conjunction with exposure to chlorides. Many factors such as internal and ambient temperature and relative humidity affect surface resistivity measurements so this data was also collected. To compare the surface resistivity to the rate of chloride ingress, cores were taken from the slabs. As expected, the surface resistivity of the
concrete slabs initially increased while the
concrete cured and lost moisture due to the hydration process and to the environment. Once ponding of the chloride solution started, however, there began to be a decrease in surface resistivity. This decrease in surface resistivity is believed to be caused by the increase of free chlorides present in the slabs after being saturated with the de-icing solution. The surface resistivity of the corresponding slabs that were ponded with tap water remained constant. These results show that surface resistivity measurements are a potential indicator of chloride ingress and, therefore, may correlate to risk of corrosion in
reinforced concrete. The effect of freeze/thaw cycling on surface resistivity, according to this study, is that it increases the surface resistivity. This is due to the micro-cracking in the
concrete matrix, caused by the freeze-thaw damage.
In the second part of this master’s thesis the corrosion susceptibility of ductile iron pipe (DIP) was investigated. Ductile iron pipe has been used mostly in the water transmission field since the 1950s. At that time, ductile iron pipe replaced traditional cast iron pipe, due to ductile iron’s superior strength properties. More recently, ductile iron pipe has been considered as a replacement for traditional timber poles for power transmission. While there are benefits to using ductile iron such as its strength and sustainability, ductile iron suffers from pitting corrosion due to the nodular structure of its free graphite. This type of corrosion can lead to severe deterioration of the pipe in localized areas. Due to this, researchers have been studying ductile iron durability and developing solutions for its durability issues. In this research study ductile iron was tested for its susceptibility to corrosion. Samples were subjected to an accelerated corrosion process inside a salt fog chamber. After the samples had corroded, mass loss measurements were taken. Tensile strength tests were also done before and after corrosion. Stainless steel samples were tested alongside the ductile iron for comparison. In…
Advisors/Committee Members: Isgor, Burkan O. (advisor), Barbosa, Andre (committee member).
Subjects/Keywords: Reinforced Concrete
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APA (6th Edition):
Shields, S. A. (2017). Assessing durability of reinforced concrete and ductile Iron. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61656
Chicago Manual of Style (16th Edition):
Shields, Silas A. “Assessing durability of reinforced concrete and ductile Iron.” 2017. Masters Thesis, Oregon State University. Accessed April 11, 2021.
http://hdl.handle.net/1957/61656.
MLA Handbook (7th Edition):
Shields, Silas A. “Assessing durability of reinforced concrete and ductile Iron.” 2017. Web. 11 Apr 2021.
Vancouver:
Shields SA. Assessing durability of reinforced concrete and ductile Iron. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1957/61656.
Council of Science Editors:
Shields SA. Assessing durability of reinforced concrete and ductile Iron. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61656
Rutgers University
3.
Abdulhameed, Haider Adel, 1979-.
Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material.
Degree: PhD, Civil and Environmental Engineering, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/55972/
► Self-consolidating concrete (SCC) has been used for repairs due to its ability in overhead applications and hard to access areas such as condensed reinforcement. However,…
(more)
▼ Self-consolidating concrete (SCC) has been used for repairs due to its ability in overhead applications and hard to access areas such as condensed reinforcement. However, due to its high content in cementitious and supplementary materials, SCC is subjected to shrinkage cracking. To overcome this aspect, fibers were used in the SCC mixtures to form what is known as fiber-reinforced self-consolidating concrete (FR-SCC). Experimental and analytical programs were carried out to investigate the use of the FR-SCC as a repair material. The experimental program included the flexural behavior of 10 beam specimens made of FR-SCC using different volume fractions of two types of supplementary cementitious materials (silica fume (SF) and slag (SL)) and two types of fibers (steel fiber (STF) and polypropylene fiber (PPF)). The main reinforcement for the control beams consisted of5 reinforcing bars, while the main reinforcement for the repaired beams was either #4 or #3 reinforcing bars that were introduced to simulate 35 % and 65 % loss in rebar areas due to corrosion, respectively. The goal of the repair scheme is focused on extending the service life of the structural elements for about 5-10 years. The analytical part of this research included the development and validation of a finite element model (FEM) that can be used for the analysis and prediction of the structural behavior at various load points. Additionally, results from the experimental program were compared with predictions of the structural properties of all the beams using various code provisions. Results from tests on the fresh and hardened mechanical properties demonstrated that the optimized FR-SCC mixtures were efficient repair materials and can develop adequate bond strength to existing concrete. The flexural test results showed that the repaired beams have higher cracking capacities compared with the control beams. A maximum percentage increase of 29 % was achieved for the beam repaired with 10SF50S compared to the average cracking load for the two control beams. This demonstrated that the repair material markedly improves the repaired area properties, especially the tensile strength. Such improvement is vital in extending the life of the repaired structure under the service loads. The ACI 318, CSA A23.3, and AASHTO-LRFD were non-conservative in estimating the cracking load as well as the deflection in both control and repaired beams, while the ACI 544 equations were conservative and provided a safe prediction for both cracking and ultimate loads. The developed finite element models (FEMs) were effective in producing good prediction in the elastic and plastic ranges of the applied load but did not produce the ultimate deflections (i.e., ductility) exhibited during the tests. Nonetheless, FEM could be used as a tool to further investigate the behavior of repaired and unrepaired concrete beams under static loading.
Advisors/Committee Members: Nassif, Hani H (chair), WANG, HAO (internal member), Najm, Husam S (internal member), Tsakalakos, Thomas (outside member), School of Graduate Studies.
Subjects/Keywords: Concrete – Reinforced; Self-consolidating concrete
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APA (6th Edition):
Abdulhameed, Haider Adel, 1. (2018). Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/55972/
Chicago Manual of Style (16th Edition):
Abdulhameed, Haider Adel, 1979-. “Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material.” 2018. Doctoral Dissertation, Rutgers University. Accessed April 11, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/55972/.
MLA Handbook (7th Edition):
Abdulhameed, Haider Adel, 1979-. “Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material.” 2018. Web. 11 Apr 2021.
Vancouver:
Abdulhameed, Haider Adel 1. Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material. [Internet] [Doctoral dissertation]. Rutgers University; 2018. [cited 2021 Apr 11].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55972/.
Council of Science Editors:
Abdulhameed, Haider Adel 1. Experimental and analytical study of fiber-reinforced self-consolidating concrete as a repair material. [Doctoral Dissertation]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55972/
Rutgers University
4.
Haddad, Elie I., 1993-.
Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams.
Degree: MS, Civil and Environmental Engineering, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/59108/
► Reinforced concrete bridge decks tend to deteriorate over time due to the increase in live load and corrosion of reinforcement and many other reasons. Economic…
(more)
▼ Reinforced concrete bridge decks tend to deteriorate over time due to the increase in live load and corrosion of reinforcement and many other reasons. Economic factors do not allow for a complete replacement of such structures which validates the importance of
concrete rehabilitation technologies. With the launch of high performance materials, the use of cementitious composites for infrastructure application for rehabilitation has become more common. Ferrocement application for bridge decks repairs is inexpensive and can extend the life of the bridge by 5 to 10 years.
This study presents the results of an experimental research performed to investigate the behavior of damaged
reinforced concrete beams repaired with fiber
reinforced ferrocement laminate. The ferrocement layer acts as a replacement to a damaged or peeled off clear cover. A total of 30 beams were tested under two point loading system up to failure. The research work discusses the effect of; the number and type of reinforcement in the laminate, and the incorporation of macro polypropylene fibers at different volume in the mortar used for the repair layer. The beams differed by their reinforcement ratios in the ferrocement laminate, thickness of the lamniate, size and number of shear studs which act as a bond between the two layers. All beams are designed to fail in flexure.
Results showed that the beams tested had noticeable improvement in terms of ductility, cracking strength (163%) and ultimate capacity (109%). The results also showed the material properties of multiple mortar mixes that were considered to be used for the fabrication of the repair layers. These mixes differed by their cementitious components, fibers content, and other parameters that will be discussed later on are in the study.
Advisors/Committee Members: Nassif, Hani H (chair), School of Graduate Studies.
Subjects/Keywords: Reinforced concrete; Concrete beams
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APA (6th Edition):
Haddad, Elie I., 1. (2018). Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/59108/
Chicago Manual of Style (16th Edition):
Haddad, Elie I., 1993-. “Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams.” 2018. Masters Thesis, Rutgers University. Accessed April 11, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/59108/.
MLA Handbook (7th Edition):
Haddad, Elie I., 1993-. “Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams.” 2018. Web. 11 Apr 2021.
Vancouver:
Haddad, Elie I. 1. Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams. [Internet] [Masters thesis]. Rutgers University; 2018. [cited 2021 Apr 11].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59108/.
Council of Science Editors:
Haddad, Elie I. 1. Investigation of fiber reinforced ferrocement composites in retrofitting reinforced concrete beams. [Masters Thesis]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59108/
Oregon State University
5.
Lostra, Mackenzie M. W.
Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars.
Degree: MS, Civil Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/59903
► Large numbers of reinforced concrete (RC) bridges were built in the past that are now considered seismically deficient. The structural members most likely to be…
(more)
▼ Large numbers of
reinforced concrete (RC) bridges were built in the past that are now considered seismically deficient. The structural members most likely to be considered deficient are the supporting columns. Typical deficient columns contain inadequate transverse reinforcement and poorly detailed lap splice lengths above the foundation. Insufficient lap splice lengths can lead to bond failure and an inability to develop the strength of the longitudinal reinforcement. Deterioration of the mechanical bond between the longitudinal reinforcement bars and the surrounding
concrete reduces the stiffness and strength of the column-footing joint and provides limited or no ductility. In addition, widely spaced transverse reinforcement may not adequately confine the base of the column. This permits premature buckling of the longitudinal reinforcement that may occur between transverse bar locations and poor confinement of the
concrete core. Complete replacement of these bridges is not practical due to limited resources thus, rehabilitation of existing deficient infrastructure is a practical approach. In this research, titanium alloy bars (TiABs) were explored as an alternative material to retrofit RC columns with poorly detailed reinforcing steel above the footing. The well-defined material properties of TiABs have the potential to provide effective and economical seismic strengthening of deficient RC columns. Compared to conventional reinforcing steel, they have relatively low stiffness, high strength, high ductility, and are fully resistant to corrosion in the operating environment. The proposed installation allows for inspection of the members and the environmental durability of the TiABs make them a viable long-term solution for column strengthening. To evaluate the potential for using TiABs to remediate seismically deficient RC columns with poor lap splice details and inadequate transverse reinforcement that were common in the U.S. prior to 1970, four full-scale columns were tested. One was a control specimen without strengthening and the other three (3) had externally mounted TiABs. The specimens were subjected to fully reversed cyclic lateral loading in the laboratory. The experimental results showed improved ductility and stable cyclic response with minor flexural strength degradation in the specimens retrofitted with TiABs and the failure modes of the columns were altered from non-ductile lap splice failure in the conventionally
reinforced column to ductile flexural failure in the retrofitted columns. They demonstrated that TiABs offer a new option for effectively strengthening seismically deficient square bridge columns.
Advisors/Committee Members: Higgins, Christopher (advisor), Evans, Matthew (committee member).
Subjects/Keywords: Reinforced Concrete; Reinforced concrete – Earthquake effects
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APA ·
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APA (6th Edition):
Lostra, M. M. W. (2016). Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59903
Chicago Manual of Style (16th Edition):
Lostra, Mackenzie M W. “Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars.” 2016. Masters Thesis, Oregon State University. Accessed April 11, 2021.
http://hdl.handle.net/1957/59903.
MLA Handbook (7th Edition):
Lostra, Mackenzie M W. “Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars.” 2016. Web. 11 Apr 2021.
Vancouver:
Lostra MMW. Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1957/59903.
Council of Science Editors:
Lostra MMW. Seismic Performance of Square Reinforced Concrete Columns Retrofitted with Titanium Alloy Bars. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59903
Stellenbosch University
6.
Gerber, Johannes Daniel.
Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures.
Degree: MEng, Civil Engineering, 2016, Stellenbosch University
URL: http://hdl.handle.net/10019.1/100069
► ENGLISH ABSTRACT: In the construction of multi-storey buildings, the reinforced concrete (RC) core or shear walls normally precede the construction of the RC floors. A…
(more)
▼ ENGLISH ABSTRACT: In the construction of multi-storey buildings, the
reinforced concrete (RC) core or shear
walls normally precede the construction of the RC floors. A system is therefore required to connect the floors to the already cast walls. There are many different floor-to-wall connection systems available in South Africa, but their behaviour and capacity are not always fully understood, especially when the moment capacity of the joint is to be utilised in order to design more economical structures.
This research investigation focusses on four systems. The first is the conventional way of casting walls and floors by using continuous starter-bars that protrude through the
formwork. The second system makes use of pre-bent site-installed starter-bars that are
fixed within the wall, straightened after the wall is cast and then lapped with the slab reinforcement. The third system is also based on the principle of pre-bent starter bars, but they are pre-assembled inside a steel box to speed up the installation process and ease access to the bars once the wall is cast. Another system, that is not as popular in South Africa yet, is the use of cast-in anchors with mechanical couplers. The anchors are cast into the
concrete wall and, once the form work is removed, threaded continuation bars are screwed into the couplers to make the connection between the floor and wall.
The design procedure for the continuous starter-bar system is well understood and documented in design codes, but not enough information is available on the design procedure for the other systems. Certain practical aspects of the installation process are also not fully understood.
Cold bending and straightening of the starter-bars are inevitable in both bend-out systems.
Previous research shows that this cold working of the reinforcement can reduce the yield stress, ductility and E-modulus of the steel. In order to investigate these findings, a series of tensile tests are conducted on Y10 and Y12 reinforcement (high yield, deformed
reinforcing bars). The results indicate that a significant reduction can be expected in both the yield stress and modulus of elasticity of the steel. A low cycle fatigue test further
con rmed that a reduction in the ductility of the steel is also present.
The next phase in the research investigation is to construct full scale models of the four
connection systems. The systems are installed in four separate joints between a cantilever
oor and a free-standing wall. The systems are designed to all have the same moment and
shear capacity and are based on a typical wall-to-slab connection found in an o ce block.
The construction of the models are done in such a way as to mimic the construction
methods in practice as closely as possible. The entire process is done in a controlled
environment, with a best practice approach adopted. Once the models are constructed,
a load is applied at the tip of the cantilever oor in order to generate a bending moment
and shear force at the wall-to-slab joint. The displacement of…
Advisors/Committee Members: Van Zijl, G. P. A. G., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Reinforced concrete slabs; UCTD; Reinforced concrete walls; Reinforced concrete construction – Models; Reinforced concrete construction – Testing
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APA ·
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Manager
APA (6th Edition):
Gerber, J. D. (2016). Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/100069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gerber, Johannes Daniel. “Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures.” 2016. Thesis, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/100069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gerber, Johannes Daniel. “Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures.” 2016. Web. 11 Apr 2021.
Vancouver:
Gerber JD. Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures. [Internet] [Thesis]. Stellenbosch University; 2016. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/100069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gerber JD. Alternative Wall-to-slab Connection Systems in Reinforced Concrete Structures. [Thesis]. Stellenbosch University; 2016. Available from: http://hdl.handle.net/10019.1/100069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rutgers University
7.
Grek, Daniel, 1987-.
High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP).
Degree: PhD, Civil and Environmental Engineering, 2017, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/55503/
► Use of Fiber Reinforced Polymer (FRP) composite in infrastructures has steadily increased over the last two decades. The primary use is still for repair, rehabilitation…
(more)
▼ Use of Fiber Reinforced Polymer (FRP) composite in infrastructures has steadily increased over the last two decades. The primary use is still for repair, rehabilitation and strengthening of structural elements made of reinforced or prestressed concrete. FRP has substantial advantage over classical structural materials such as steel in the area weight, strength, and durability against corrosion. Two major drawbacks of FRP are the lack of fiber resistance and brittle fracture of high strength fibers. The results presented in this dissertation address these two issues. High strength steel wire, commercially known as “Hardwire,” was used in combination with inorganic matrix. The inorganic matrix, similar in chemistry to Portland cement matrix, is more compatible with steel than organic polymers. In addition, the matrix can withstand more than 2000°F with no smoke, or toxins. The larger fiber diameter, as compared to thin carbon or other high strength fibers, and non-simultaneous failure of wires provide better ductility as compared to classical FRP. The experimental and analytical investigations were tailored to evaluate steel reinforced inorganic polymer (SRiP) composite at high temperatures. Rectangular reinforced concrete beams strengthened with SRiP on the tension side were tested with high moment section exposed to temperatures upwards of 1000°F. The beams were loaded in four point loading, and the maximum moment section at the midspan was heated using hot plates. Heating and cooling were repeated three times to establish the robustness of the repair at high temperature. After this cyclic exposure, Beams were tested to failure. Control beams with no strengthening and control strengthened beams that were not exposed to high temperature were also tested to compare the behavior of SRiP beams with carbon FRP strengthened beams. The results show that SRiP strengthened beams behaved similarly to classical FRP strengthened beams and can withstand higher temperatures without losing load capacity. Note that most polymers cannot withstand more than 300°F and carbon fibers start to oxidize around 800°F. Overall results presented in the dissertation show that inorganic polymer-steel fiber, high strength composite is a viable FRP for strengthening and rehabilitation. The added advantages are high temperature resistance and improved ductility.
Advisors/Committee Members: Balaguru, P N (chair), Najm, Husam (internal member), Yong, Yook-Kong (internal member), Yi, Jingang (outside member), School of Graduate Studies.
Subjects/Keywords: Polymers; Reinforced concrete
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Manager
APA (6th Edition):
Grek, Daniel, 1. (2017). High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP). (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/55503/
Chicago Manual of Style (16th Edition):
Grek, Daniel, 1987-. “High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP).” 2017. Doctoral Dissertation, Rutgers University. Accessed April 11, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/55503/.
MLA Handbook (7th Edition):
Grek, Daniel, 1987-. “High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP).” 2017. Web. 11 Apr 2021.
Vancouver:
Grek, Daniel 1. High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP). [Internet] [Doctoral dissertation]. Rutgers University; 2017. [cited 2021 Apr 11].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55503/.
Council of Science Editors:
Grek, Daniel 1. High temperature resistance of reinforced concrete beams strengthened with steel reinforced inorganic polymer (SRIP). [Doctoral Dissertation]. Rutgers University; 2017. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55503/
Rutgers University
8.
Sholy, Christopher.
Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams.
Degree: MS, Civil and Environmental Engineering, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/57726/
► The deteriorated state of the current infrastructure is problematic and economic factors limit the complete replacement of structures, stressing the importance on rehabilitation to extend…
(more)
▼ The deteriorated state of the current infrastructure is problematic and economic factors limit the complete replacement of structures, stressing the importance on rehabilitation to extend the service life of existing structures. The use of self-consolidating
concrete (SCC) in recent years has greatly reduced the cost of labor due to the fresh material properties such as superior flowability and workability compared to other types of
concrete, allowing it to flow under its own weight and fill formwork and without the use of mechanical consolidation. It’s application in rehabilitation of
reinforced concrete beams can significantly shorten construction time while simultaneously enhancing flexural behavior. This study addresses the effect of steel and synthetic fibers to the fresh and hardened properties of SCC when applied as a strengthening laminate for
reinforced concrete beams. Eight fiber-
reinforced self-consolidating
concrete (FR-SCC) mixes were developed by introducing crimped steel fibers (1.5”), macro-synthetic fibers (0.75”, 1.5” and 2.0”), and micro-synthetic fibers (0.75”) at variable dosages, with respect to a control SCC mix. Four FR-SCC mixes and the control were utilized for retrofitting
reinforced concrete beams. Results show that certain FR-SCC mixes enhance hardened properties relative to the control SCC, while still maintaining highly workable fresh properties. To simulate deterioration and loss of
concrete cover,
reinforced concrete beams were casted with exposed stirrups. Beams were then retrofitted varying the amount and type of steel reinforcement (#2 rebar, galvanized welded wire mesh, and galvanized low-density tape), type and size of the shear studs, fiber type and length, and fiber content of the laminate. Results show that the addition of welded wire mesh reinforcement increases service loads by an average of 8% per layer and ultimate deflection by an average of 9%, but also increases crack width in bending. The addition of2 rebar in the laminate increases ultimate loads by 34% and ultimate deflection by 30% on average while also reducing crack width. Cracking loads and ultimate loads were enhanced by up to 34% and 18%, respectively as stud size increased. The use of FR-SCC for laminates reduced crack width relative to plain SCC laminates up to 16%, while also enhancing deflection up to 35% and increasing cracking loads.
Advisors/Committee Members: Nassif, Hani (chair), Abu-Obeidah, Adi (internal member), Jin, Jing (Peter) (internal member), School of Graduate Studies.
Subjects/Keywords: Fiber-reinforced concrete
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APA (6th Edition):
Sholy, C. (2018). Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/57726/
Chicago Manual of Style (16th Edition):
Sholy, Christopher. “Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams.” 2018. Masters Thesis, Rutgers University. Accessed April 11, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/57726/.
MLA Handbook (7th Edition):
Sholy, Christopher. “Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams.” 2018. Web. 11 Apr 2021.
Vancouver:
Sholy C. Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams. [Internet] [Masters thesis]. Rutgers University; 2018. [cited 2021 Apr 11].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/57726/.
Council of Science Editors:
Sholy C. Investigation of fiber reinforced self-consolidation concrete laminates in retrofitting concrete beams. [Masters Thesis]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/57726/
Rutgers University
9.
Shehata, Andrew, 1996-.
Creep behavior of high-performance concrete reinforced with polypropylene fibers.
Degree: MS, Civil and Environmental Engineering, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61058/
► High performance concrete (HPC) is being used on daily basis by the construction industry, due to its suburb properties. HPC attains high strength and durability…
(more)
▼ High performance
concrete (HPC) is being used on daily basis by the construction industry, due to its suburb properties. HPC attains high strength and durability that made it out preform other
concrete mixes. With the extensive use of HPC in all type of infrastructures, challenges tended to arise, and shrinkage issues became obvious, and accelerated curing was needed by the construction industry. Shrinkage in HPC resulted into cracking, which made the steel reinforcement in all the structures vulnerable to corrosion. Fiber reinforcement in
concrete became one of the practices to minimize shrinkage cracks, and avoid corrosion concerns. Moreover, accelerator admixtures started gaining popularity because it allowed faster construction, which resulted in shorter traffic closures, as well as lowering construction costs.
Effects on creep and shrinkage behaviors with the use of fibers and accelerator liquid admixtures in HPC remains in question. Although fiber
reinforced HPC and high early strength (HES)
concrete is being frequently used, there is not enough research preformed to understand their creep and shrinkage phenomena.
The objective of this research study is to investigate the effects of polypropylene fibers and accelerated admixtures to creep and shrinkage deformations in HPC. Several theoretical models will also be modeled, analyzed and evaluated with comparison to the experimental results. Finally, adjustments to the models will be suggested to improve creep predictions.
Advisors/Committee Members: Nassif, Hani (chair), Abu-Obeidah, Adi (co-chair), WANG, HAO (internal member), School of Graduate Studies.
Subjects/Keywords: Reinforced concrete – Creep
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APA (6th Edition):
Shehata, Andrew, 1. (2019). Creep behavior of high-performance concrete reinforced with polypropylene fibers. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61058/
Chicago Manual of Style (16th Edition):
Shehata, Andrew, 1996-. “Creep behavior of high-performance concrete reinforced with polypropylene fibers.” 2019. Masters Thesis, Rutgers University. Accessed April 11, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61058/.
MLA Handbook (7th Edition):
Shehata, Andrew, 1996-. “Creep behavior of high-performance concrete reinforced with polypropylene fibers.” 2019. Web. 11 Apr 2021.
Vancouver:
Shehata, Andrew 1. Creep behavior of high-performance concrete reinforced with polypropylene fibers. [Internet] [Masters thesis]. Rutgers University; 2019. [cited 2021 Apr 11].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61058/.
Council of Science Editors:
Shehata, Andrew 1. Creep behavior of high-performance concrete reinforced with polypropylene fibers. [Masters Thesis]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61058/
Kansas State University
10.
Liao, Changmin.
Design
considerations for two-flight reinforced concrete
stairs.
Degree: MS, Department of Architectural
Engineering and Construction Science, 2020, Kansas State University
URL: http://hdl.handle.net/2097/40601
► The reinforced concrete stairs are commonly used in the built environment for many years. In the early 20th century, the use of steel as the…
(more)
▼ The
reinforced concrete stairs are commonly used in
the built environment for many years. In the early 20th century,
the use of steel as the structural system for stairs has increased,
and
reinforced concrete has decreased as the most common structural
material. However, the ability to make any shape, readily available
materials, the compressive strength, and outstanding fire
resistance of
reinforced concrete ensure that it is a vital
material in the built environment. Especially for stairs serving as
egress for people to evacuate under severe conditions,
reinforced
concrete as a building material stands out. This report presents a
design procedure for two-flight
reinforced concrete stairs and
provides a parametric study to analyze the relationship between
flexural reinforcement and critical factors: reinforcement design
methods, geographic locations, stair slab thicknesses, and boundary
conditions. For this study, the materials are limited to normal
weight
concrete with ASTM 615 Grade 60 steel reinforcing with a
specified yield strength of 60,000 psi. Twenty-four cases are
designed with varying reinforcement design methods, geographic
locations, stair slab thicknesses, and boundary conditions. The
purpose of this report is to examine the differences in
reinforcement design for
reinforced concrete stairs.
Advisors/Committee Members: Jongchul SongKimberly W. Kramer.
Subjects/Keywords: Reinforced
concrete;
Stair; Reinforced
concrete stair; Two flight
reinforced concrete stair
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Manager
APA (6th Edition):
Liao, C. (2020). Design
considerations for two-flight reinforced concrete
stairs. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/40601
Chicago Manual of Style (16th Edition):
Liao, Changmin. “Design
considerations for two-flight reinforced concrete
stairs.” 2020. Masters Thesis, Kansas State University. Accessed April 11, 2021.
http://hdl.handle.net/2097/40601.
MLA Handbook (7th Edition):
Liao, Changmin. “Design
considerations for two-flight reinforced concrete
stairs.” 2020. Web. 11 Apr 2021.
Vancouver:
Liao C. Design
considerations for two-flight reinforced concrete
stairs. [Internet] [Masters thesis]. Kansas State University; 2020. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2097/40601.
Council of Science Editors:
Liao C. Design
considerations for two-flight reinforced concrete
stairs. [Masters Thesis]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40601
Florida Atlantic University
11.
Nazim, Manzurul.
Corrosion Propagation of Rebar Embedded in High Performance Concrete.
Degree: MS, 2017, Florida Atlantic University
URL: http://purl.flvc.org/fau/fd/FA00004941
;
(URL)
http://purl.flvc.org/fau/fd/FA00004941
► Summary: The FDOT has been using supplementary cementitious materials while constructing steel reinforced concrete marine bridge structures for over 3 decades. Previous findings indicated that…
(more)
▼ Summary: The FDOT has been using supplementary cementitious materials while constructing steel reinforced concrete marine bridge structures for over 3 decades. Previous findings indicated that such additions in concrete mix makes the concrete more durable. To better understand corrosion propagation of rebar in high performance concrete: mature concrete samples that were made (2008/2009) with Portland cement, a binary mix, a ternary mix and recently prepared (April 2016 with 50% OPC + 50% slag and 80% OPC + 20% Fly ash) concrete samples were considered. None of these concretes had any admixed chloride to start with. An accelerated chloride transport process was used to drive chloride ions into the concrete so that chlorides reach and exceed thechloride threshold at the rebar surface and initiate corrosion. Electrochemical measurements were taken at regular intervals (during and after the electro-migration process) to observe the corrosion propagation in each sample.
2017
Degree granted: Thesis (M.S.) – Florida Atlantic University, 2017.
Collection: FAU
Advisors/Committee Members: Presuel-Moreno, Francisco (Thesis advisor), Florida Atlantic University (Degree grantor), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering.
Subjects/Keywords: Reinforced concrete – Corrosion.; Reinforced concrete – Chemical resistance.; Reinforced concrete – Deterioration.; Concrete – Corrosion.; Concrete – Mechanical properties.
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Manager
APA (6th Edition):
Nazim, M. (2017). Corrosion Propagation of Rebar Embedded in High Performance Concrete. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/fau/fd/FA00004941 ; (URL) http://purl.flvc.org/fau/fd/FA00004941
Chicago Manual of Style (16th Edition):
Nazim, Manzurul. “Corrosion Propagation of Rebar Embedded in High Performance Concrete.” 2017. Masters Thesis, Florida Atlantic University. Accessed April 11, 2021.
http://purl.flvc.org/fau/fd/FA00004941 ; (URL) http://purl.flvc.org/fau/fd/FA00004941.
MLA Handbook (7th Edition):
Nazim, Manzurul. “Corrosion Propagation of Rebar Embedded in High Performance Concrete.” 2017. Web. 11 Apr 2021.
Vancouver:
Nazim M. Corrosion Propagation of Rebar Embedded in High Performance Concrete. [Internet] [Masters thesis]. Florida Atlantic University; 2017. [cited 2021 Apr 11].
Available from: http://purl.flvc.org/fau/fd/FA00004941 ; (URL) http://purl.flvc.org/fau/fd/FA00004941.
Council of Science Editors:
Nazim M. Corrosion Propagation of Rebar Embedded in High Performance Concrete. [Masters Thesis]. Florida Atlantic University; 2017. Available from: http://purl.flvc.org/fau/fd/FA00004941 ; (URL) http://purl.flvc.org/fau/fd/FA00004941
Florida Atlantic University
12.
Ellis, Spencer G.
SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST.
Degree: MS, 2020, Florida Atlantic University
URL: http://fau.digital.flvc.org/islandora/object/fau:42604
► In order to study the mechanical performance of dry-cast synthetic fiber reinforced concrete (SynFRC), samples of varying geometry, fiber content, and environmental exposure were developed…
(more)
▼ In order to study the mechanical performance of dry-cast synthetic fiber reinforced concrete (SynFRC), samples of varying geometry, fiber content, and environmental exposure were developed and tested using the modified indirect tensile test. The samples created consisted of three different thicknesses (with two different geometries), and six different fiber contents that differed in either type, or quantity, of fibers. Throughout the duration of this research, procedures for inflicting detrimental materials into the concrete samples were employed at a number of different environments by implementing accelerated rates of deterioration using geometric adjustments, increased temperature exposure, wetting/drying cycles, and preparation techniques. The SynFRC samples studied were immersed in a wide range of environments including: the exposure of samples to high humidity and calcium hydroxide environments, which served at the control group, while the sea water, low pH, and barge conditioning environments were used to depict the real world environments similar to what would be experienced in the
Florida ecosystem. As a result of this conditioning regime, the concrete was able to imitate the real-world effects that the environments would have inflicted if exposed for long durations after an exposure period of only 20-24 months. Having adequately conditioned the samples in their respective environments, they were then tested (and forensically investigated) using the modified indirect tensile testing method to gather data regarding each sample’s toughness and load handling capability. By analyzing the results from each sample, the toughness was calculated by taking the area under the force displacement curve. From these toughness readings it was found that possible degradation occurred between the fiber-matrix interface of some of the concrete samples conditioned in the Barge environment. From these specimens that were immersed in the barge environment, a handful of them exhibited multiple episodes of strain softening characteristics within their force displacement curves. In regard to the fibers used within the samples, the PVA fibers tended to pull off more while the Tuff Strand SF fibers had the highest tendency to break (despite some of the fibers showing similar pull off and breaking failure characteristics). When it comes to the overall thickness of the sample, there was clear correlation between the increase in size and the increase in sample toughness, however the degree to which it correlates varies from sample to sample.
2020
Degree granted:
Collection: FAU
Advisors/Committee Members: Presuel-Moreno, Francisco (Thesis advisor), Florida Atlantic University (Degree grantor), Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science.
Subjects/Keywords: Reinforced concrete; Fiber-reinforced concrete – Testing; Reinforced concrete – Mechanical properties; Tensile Strength; Concrete—Environmental testing
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ellis, S. G. (2020). SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST. (Masters Thesis). Florida Atlantic University. Retrieved from http://fau.digital.flvc.org/islandora/object/fau:42604
Chicago Manual of Style (16th Edition):
Ellis, Spencer G. “SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST.” 2020. Masters Thesis, Florida Atlantic University. Accessed April 11, 2021.
http://fau.digital.flvc.org/islandora/object/fau:42604.
MLA Handbook (7th Edition):
Ellis, Spencer G. “SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST.” 2020. Web. 11 Apr 2021.
Vancouver:
Ellis SG. SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST. [Internet] [Masters thesis]. Florida Atlantic University; 2020. [cited 2021 Apr 11].
Available from: http://fau.digital.flvc.org/islandora/object/fau:42604.
Council of Science Editors:
Ellis SG. SYNTHETIC FIBER REINFORCED CONCRETE PERFORMANCE AFTER PROLONGED ENVIRONMENTAL EXPOSURE UTILIZING THE MODIFIED INDIRECT TENSILE TEST. [Masters Thesis]. Florida Atlantic University; 2020. Available from: http://fau.digital.flvc.org/islandora/object/fau:42604
Stellenbosch University
13.
Nieuwoudt, Pieter Daniel.
Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level.
Degree: D.Phil, Civil Engineering, 2016, Stellenbosch University
URL: http://hdl.handle.net/10019.1/98497
► ENGLISH ABSTRACT: The addition of steel fibres to a concrete matrix is known to improve the material’s post crack mechanical behaviour under short term loading…
(more)
▼ ENGLISH ABSTRACT: The addition of steel fibres to a
concrete matrix is known to improve the material’s post crack mechanical behaviour under short term loading conditions. However, limited information is available on the material’s post-crack behaviour under long-term loading, particularly under sustained uni-axial tensile loading.
The purpose of this research study is to investigate and quantify the time-dependent Crack Mouth Opening Displacement (CMOD) behaviour of cracked Steel Fibre
Reinforced Concrete (SFRC) under sustained uni-axial tensile loading, and to develop a mathematical model which is able to simulate the time-dependent crack width opening behaviour of cracked SFRC under sustained uni-axial tensile loading.
To reach this goal, experimental investigations were performed at two levels, namely macroscopic level and single fibre level. At the macroscopic level, the short term mechanical properties of SFRC were investigated by performing compressive and uni-axial tensile strength tests. To investigate the long term mechanical properties of cracked SFRC, sustained uni-axial tensile load tests were performed at stress levels ranging from 30 % to 85 % of the residual tensile strength. To understand the mechanisms causing the time-dependent CMOD as well as the factors that can influence the behaviour, single fibre pull-out rate tests and single fibre sustained load tests were performed on hooked-end steel fibres.
The SFRC showed significant toughness and energy absorption capacity after cracking, both under compression and uni-axial tensile loading. The sustained uni-axial tensile load results showed that the time-dependent CMOD increases with the applied sustained stress level. Over the measured time period of 240 days none of the tested specimens fractured even for stress levels as high as 85 % of the residual tensile strength. Significant variability was found in the results at each load level and it was concluded that the variation in the crack plane fibre count for each specimen is one possible reason for the variability at each load level.
The single fibre pull-out rate results showed significant rate sensitivity for the slip at maximum pull-out force. This rate effect is induced by the interface between the hooked-end of the fibre and the surrounding matrix. The fibre embedment inclination angle and the geometry of the mechanical hooked-end of the fibre have been found to significantly affect the pull-out behaviour. The single fibre sustained load results showed that the pull-out due to a sustained load is dependent on the applied load level. The pull-out due to a sustained load is referred to as pull-out creep and is defined as the relative movement between the fibre and the matrix interface under sustained loading. It is found that the pull-out creep is induced by the localised compression of the surrounding matrix by the hooked-end of the fibre. The mechanisms responsible for the pull-out creep are therefore believed to be similar as the creep for bulk normal
concrete under compression.
A…
Advisors/Committee Members: Boshoff, W. P., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Fiber-reinforced concrete; Reinforced concrete construction; Concrete – Expansion and contraction; Concrete – Cracking; Concrete – Curing; UCTD
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APA (6th Edition):
Nieuwoudt, P. D. (2016). Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/98497
Chicago Manual of Style (16th Edition):
Nieuwoudt, Pieter Daniel. “Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level.” 2016. Doctoral Dissertation, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/98497.
MLA Handbook (7th Edition):
Nieuwoudt, Pieter Daniel. “Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level.” 2016. Web. 11 Apr 2021.
Vancouver:
Nieuwoudt PD. Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level. [Internet] [Doctoral dissertation]. Stellenbosch University; 2016. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/98497.
Council of Science Editors:
Nieuwoudt PD. Time-dependent Behaviour of Cracked Steel Fibre Reinforced Concrete: from Single Fibre Level to Macroscopic Level. [Doctoral Dissertation]. Stellenbosch University; 2016. Available from: http://hdl.handle.net/10019.1/98497
Stellenbosch University
14.
Bester, Hermanus Lambertus.
Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications.
Degree: MEng, Civil Engineering, 2017, Stellenbosch University
URL: http://hdl.handle.net/10019.1/100854
► ENGLISH ABSTRACT: The versatility and ready availability of concrete has ensured that this material will continue to be one of great and increasing importance for…
(more)
▼ ENGLISH ABSTRACT: The versatility and ready availability of
concrete has ensured that this material will continue to
be one of great and increasing importance for all types of construction (Domone, 2010). Due
to its low tensile strength in comparison with its compressive strength, unreinforced
concrete
suffers from brittle failure in uni-axial or flexural tension. This drawback can be compensated
for by the addition of fibres to the
concrete in its fresh state to provide ductility to the brittle
concrete matrix.
The primary objective of this study is to create generic models which can be implemented to
predict the post-cracking performance of Macro-Synthetic Fibre
Reinforced Concrete (MSFRC),
specifically for industrial flooring applications. To develop the generic models, an extensive
background study on FRC is conducted to identify possible factors influencing the performance
of MSFRC.
Concrete compressive strength, coarse aggregate size, coarse aggregate volume, fibre
dosage, and mixing time of MSFRC in its fresh state are identified as the possible influencing
factors. Research hypotheses are stated and investigated to determine which of the factors
identified have a significant influence on the post-cracking performance of MSFRC, specifically
for an experimental macro-synthetic fibre supplied by CHRYSO.
Generic linear models are derived to predict the residual flexural tensile strength of MSFRC at
specific crack mouth opening displacements (CMOD) and are based on the macro-mechanical
tests performed according to EN 14651 (European Norms, 2007). It is concluded that fibre
dosage is the only identified factor indicating a significant influence on the residual flexural
strength of MSFRC. It is also concluded that the limit of proportionality (LOP), which corresponds
to the maximum stress between a CMOD of 0 − 0.05 mm, is only influenced by the
compressive strength.
Single-fibre pull-out tests (SFPOT) are performed to investigate the effect of compressive strength
on the single-fibre performance of the CHRYSO macro-synthetic experimental fibre in its virgin
and premixed fibre state. An increase in the performance is evident for the premixed fibres and
can be attributed to the mixing process, causing a roughening of the fibre surface and ultimately
increasing the fibre-matrix bond characteristics. It is established that compressive strength does
not affect the single-fibre performance of the fibre in its virgin state. However, an increase in
the performance of the premixed fibres is evident for a decrease in compressive strength, with
the explanation of this phenomenon being unclear.
Simple- and multiple regression analyses are performed to statistically identify the factors that
have a significant effect on the performance of MSFRC and to derive linear models predicting the performance parameters. The regression analyses are based on the obtained macro-mechanical
results. As from the visual inspection of the macro-mechanical results, the regression analyses
concluded that fibre…
Advisors/Committee Members: Boshoff, William Peter, Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Reinforced concrete; Reinforced concrete – Cracking; Flooring, Concrete; UCTD
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Manager
APA (6th Edition):
Bester, H. L. (2017). Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/100854
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bester, Hermanus Lambertus. “Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications.” 2017. Thesis, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/100854.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bester, Hermanus Lambertus. “Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications.” 2017. Web. 11 Apr 2021.
Vancouver:
Bester HL. Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/100854.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bester HL. Generic model for predicting the performance of macro-synthetic fibre reinforced concrete for industrial flooring applications. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/100854
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
15.
Ramadevi K.
Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;.
Degree: Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/49451
► The concept of using fibres to reinforce a brittle material is not new According to American Concrete Institute ACI manual of concrete practice the use…
(more)
▼ The concept of using fibres to reinforce a brittle
material is not new According to American Concrete Institute ACI
manual of concrete practice the use of two or more types of fibres
in a concrete mix is considered promising An appropriate
combination of fibres produces a better composite concrete than
individual fibres for special applications The various fibres used
in concrete are Steel Glass Carbon Polypropylene and Polyolefin The
combination of steel and polyolefin appears to be the currently
developing choice as revealed by a review of recent literature In
the present research experimental studies were carried out to
investigate the ductile behaviour of Hybrid Fibre Reinforced
Concrete HFRC elements of grade M25 using Steel and Polyolefin
fibres The effect of hybrid fibres in Beams Slabs and Frames with
and without infills was studied experimentally
newline
Advisors/Committee Members: Venkatesh Babu D L.
Subjects/Keywords: Civil engineering; Ductile beahaviour; Hybrid fibre reinforced concrete; Reinforced concrete elements; Reinforced concrete frames
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Manager
APA (6th Edition):
K, R. (2015). Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/49451
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
K, Ramadevi. “Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;.” 2015. Thesis, Anna University. Accessed April 11, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/49451.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
K, Ramadevi. “Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;.” 2015. Web. 11 Apr 2021.
Vancouver:
K R. Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Apr 11].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/49451.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
K R. Investigations on ductile behaviour of hybrid fibre
reinforced concrete elements and frames;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/49451
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
16.
Bezuidenhout, Schalk Ruan.
Corrosion propagation in cracked reinforced concrete structures.
Degree: MEng, Civil Engineering, 2017, Stellenbosch University
URL: http://hdl.handle.net/10019.1/102853
► ENGLISH ABSTRACT: The durability of a reinforced concrete (RC) structure is significantly influenced by the presence of cracks. Cracks act as pathways that accelerate the…
(more)
▼ ENGLISH ABSTRACT: The durability of a reinforced concrete (RC) structure is significantly
influenced by the presence of cracks. Cracks act as pathways that accelerate the ingress of corrosion agents into the concrete to the
embedded reinforcement. This causes the acceleration of both the corrosion initiation and propagation stages of degradation. The increase in the corrosion rate in the corrosion propagation stage leads to a reduction in the residual service life of a structure. The overall effect of
cracks in RC structures is that the residual service life of a structure is remarkably shortened.
In recent years, many researchers have investigated the corrosion of structures in the propagation stage. However, the majority of these investigations are focused on specimens with only one crack and
reinforcement rod. This study investigates cracked RC exposed to chloride-induced corrosion. The experimental investigation considers three different reinforcement layouts, namely 1Y10, 2Y10 and 3Y10, and
four crack spacings (Sc), as follows: single crack, 70 ≤ Sc ≤ 85 mm, 85< Sc < 100mm ≤ 100 ≤ Sc ≤ 120 mm. Twenty-seven 150 x 150 x 700 mm long beams were sustained in flexural loading to maintain a consistent
surface crack width of 0.4 ± 0.1 mm. The specimens were subjected to cyclic ponding for 36 weeks, and were monitored weekly to measure the corrosion rate and corrosion potential.
The results indicate that the corrosion rate of the RC members is influenced by a change in reinforcement density. For a given crack spacing, the corrosion rate decreased with an increase in reinforcement
density. In addition, the corrosion rates were influenced by different crack spacing. It was also observed that single cracked specimens were susceptible to a higher corrosion rate than the multiply cracked specimens. The combined effect of reinforcement density and crack
spacing has shown that apart from a complex relationship between the anode and cathode region, the increase in reinforcement density has a greater in
uence on the corrosion rate than the increase in crack spacing.
In current practice, the onset of the corrosion propagation stage conservatively marks the end of the structure's serviceable life. A model for determining the residual service life of a structure in the corrosion
propagation stage is proposed. This model may be used to gain insight regarding a structure's \corrosion state" for planning maintenance and determining its remaining service life. The study recommends that reinforcement density and crack spacing, accompanied by the prediction
of residual service life, should be taken into consideration in the durability design of RC structures.
AFRIKAANSE OPSOMMING: Die duursaamheid van 'n gewapende beton (GB) struktuur word aansienlik beïnvloed deur die teenwoordigheid van krake. Krake dien as weë wat die indringing van roesmiddels in die beton na die bewapening versnel. Dit veroorsaak die versnelling van beide die korrosie-inisiasie en
voortsettingsfases van verwering. Die toename in die korrosiesnelheid…
Advisors/Committee Members: Van Zijl, Gideon Pieter Adriaan Greeff, Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Reinforced concrete – Corrosion; Reinforced concrete – Cracking; Corrosion rate; Reinforced concrete – Testing; Stress corrosion; UCTD
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APA (6th Edition):
Bezuidenhout, S. R. (2017). Corrosion propagation in cracked reinforced concrete structures. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/102853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bezuidenhout, Schalk Ruan. “Corrosion propagation in cracked reinforced concrete structures.” 2017. Thesis, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/102853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bezuidenhout, Schalk Ruan. “Corrosion propagation in cracked reinforced concrete structures.” 2017. Web. 11 Apr 2021.
Vancouver:
Bezuidenhout SR. Corrosion propagation in cracked reinforced concrete structures. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/102853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bezuidenhout SR. Corrosion propagation in cracked reinforced concrete structures. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/102853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Technology, Sydney
17.
Kabir, MI.
Short and long term performance of concrete structures repaired/strengthened with FRP.
Degree: 2014, University of Technology, Sydney
URL: http://hdl.handle.net/10453/30380
► Fibre Reinforced Polymer (FRP) composites have lately become a popular choice for strengthening and/or repairing of reinforced concrete (RC) structures due to their advantageous properties…
(more)
▼ Fibre Reinforced Polymer (FRP) composites have lately become a popular choice for strengthening and/or repairing of reinforced concrete (RC) structures due to their advantageous properties such as high strength- to-weight ratio, high corrosion resistance and easy application process. As the performance of FRP bonded RC structures depends on the effective stress transfer between FRP and concrete, extensive research has been conducted on the FRP-concrete bond system under short term loads. However, studies on the long term performance of FRP-concrete bond subjected to environmental conditions are very limited.
Experimental studies on the long term performance of FRP strengthened structures to-date include the study of the effect of various environmental conditions using a variety of test set-ups such as pull-off, bending tests of beams and direct shear tests. However, the available studies based on various conditions and set-ups make it difficult to compare the findings. As the effectiveness of FRP-strengthening schemes, either used for flexural or shear strengthening, lies in the shear stress transfer between FRP and concrete, study of FRP-concrete bond subjected to different environmental conditions by direct shear tests were suggested by some of the researchers. Even sensitivity of this set-up to environmental conditions was also reported. Therefore, more research with similar test set-ups to create a large database of FRP-concrete bond behaviour under various environmental conditions can be of immense value. In addition, using very high temperature for accelerated ageing was found to be very common in available literatures. However, in reality structures may not be exposed to such high temperatures and using high temperature may lead to conservative prediction of long-term properties. Moreover, unavailability of test data for FRP-concrete bond subjected to natural ageing observed in the existing literatures necessitates the investigation on FRP-concrete behaviour under natural environment.
In regards to the short term performance of reinforced concrete beams strengthened and/or repaired with FRP, extensive research have been conducted to-date in terms of experimental and analytical study. Some of these studies have also proposed design guidelines. However, the equations for prediction of load carrying capacity of severely damaged repaired beams, especially, considering the strain hardening after yielding are not recommended.
Considering the identified gaps in the previous research on long term performance of FRP-concrete bond system and the short term performance of RC beams strengthened and/or repaired with FRP, the research study presented in this dissertation has mainly focused on the experimental investigation of the long-term performance of carbon FRP and glass FRP-concrete bond under three separate environmental conditions, namely, temperature cycles, wet-dry cycles and outdoor environment up to 18 months. The secondary objective is to investigate the effectiveness of typical FRP-strengthening schemes,…
Subjects/Keywords: FRP.; Fibre reinforced Polymer.; Reinforced concrete structures.; Fibre reinforced concrete.; Concrete repair.; Wildcardtest.
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APA (6th Edition):
Kabir, M. (2014). Short and long term performance of concrete structures repaired/strengthened with FRP. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/30380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kabir, MI. “Short and long term performance of concrete structures repaired/strengthened with FRP.” 2014. Thesis, University of Technology, Sydney. Accessed April 11, 2021.
http://hdl.handle.net/10453/30380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kabir, MI. “Short and long term performance of concrete structures repaired/strengthened with FRP.” 2014. Web. 11 Apr 2021.
Vancouver:
Kabir M. Short and long term performance of concrete structures repaired/strengthened with FRP. [Internet] [Thesis]. University of Technology, Sydney; 2014. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10453/30380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kabir M. Short and long term performance of concrete structures repaired/strengthened with FRP. [Thesis]. University of Technology, Sydney; 2014. Available from: http://hdl.handle.net/10453/30380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
18.
Vrána, Libor.
Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE.
Degree: 2015, Brno University of Technology
URL: http://hdl.handle.net/11012/16833
The Bachelor´s thesis describes static analysis and design of reinforced concrete slabs of the buildings office. Entering the work is to verify and dimension elements of structure.
Advisors/Committee Members: Šulák, Pavel (advisor), Horáková, Hana (referee).Subjects/Keywords: Železobeton; železobetonová stropní konstrukce; železobetonové žebro; Reinforced concrete; reinforced concrete slab; reinforced concrete rib
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APA ·
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APA (6th Edition):
Vrána, L. (2015). Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/16833
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vrána, Libor. “Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE.” 2015. Thesis, Brno University of Technology. Accessed April 11, 2021.
http://hdl.handle.net/11012/16833.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vrána, Libor. “Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE.” 2015. Web. 11 Apr 2021.
Vancouver:
Vrána L. Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE. [Internet] [Thesis]. Brno University of Technology; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/11012/16833.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vrána L. Posouzení nosné konstrukce polyfunkčního domu: ASSESSMENT SUPPOSTING CONSTRUCTION OF THE BUILDINGS OFFICE. [Thesis]. Brno University of Technology; 2015. Available from: http://hdl.handle.net/11012/16833
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
19.
Mazarei, Vandad.
Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems.
Degree: MS, Civil Engineering, 2015, Oregon State University
URL: http://hdl.handle.net/1957/57962
► Alkali silica reaction (ASR) and corrosion of reinforcement are two deterioration mechanisms in reinforced concrete (RC) structures. These deterioration mechanisms can significantly damage a RC…
(more)
▼ Alkali silica reaction (ASR) and corrosion of reinforcement are two deterioration mechanisms in
reinforced concrete (RC) structures. These deterioration mechanisms can significantly damage a RC structure and reduce its service life. Supplementary cementitious materials (SCMs) are commonly used to improve the durability of RC systems containing reactive aggregate that are exposed to chloride environments. Fly ash is commonly used to decrease the chloride transport rate in
concrete. This reduction can result in longer times to corrosion initiation and longer service lives. Significant research has also been conducted on the effects of fly ash on ASR. The literature indicates that inclusion of fly ash in concretes that contains reactive aggregate can reduce the expansion and damage. Although significant research has been conducted to investigate ASR and corrosion separately, little research has been done to quantify the synergistic effects of ASR and fly ash content on corrosion performance of RC systems.
The research presented here investigates the synergistic effects of aggregate reactivity (e.g., ASR) and fly ash content on corrosion performance of RC specimens. Specimens containing different fly ash contents (0, 20, and 40%) with and without reactive aggregate were exposed to wetting and drying cycles exposed to a 100 °F (38 °C) and >95% relative humidity environment. Expansion of the specimens, corrosion potential, and macrocell current were measured at monthly intervals until the embedded reinforcement began to actively corroded. Apparent diffusivity was measured when the corrosion initiation occurred in the specimens.
Results show that increasing fly ash content in specimens with non-reactive aggregate results in lower Da values and lower CT values in
concrete. Lower Da values are beneficial for extending time to corrosion initiation whereas lower CT values are not. Results from this research indicate that the benefits from the lower Da values are more significant than the disbenefits from the reduction in CT when assessing time to corrosion initiation.
Results for specimens containing reactive aggregates indicate that inclusion of 20% fly ash exhibits the longest time to corrosion initiation. Results indicate that the formation of small amounts of ASR gel in specimens containing 20% fly ash with reactive aggregate can fill the ITZs and cracks. EDX analyses of the ASR gel indicate that chlorides are not present in the gel. This indicates that the transport rate of chlorides through ASR gel is significantly lower than the hcp. The results from this research indicate that the ASR gel can reduce the Da of the overall
concrete system and increase the time to corrosion initiation.
Advisors/Committee Members: Trejo, David (advisor), Ideker, Jason (committee member).
Subjects/Keywords: Corrosion; Reinforced concrete – Corrosion
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APA (6th Edition):
Mazarei, V. (2015). Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/57962
Chicago Manual of Style (16th Edition):
Mazarei, Vandad. “Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems.” 2015. Masters Thesis, Oregon State University. Accessed April 11, 2021.
http://hdl.handle.net/1957/57962.
MLA Handbook (7th Edition):
Mazarei, Vandad. “Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems.” 2015. Web. 11 Apr 2021.
Vancouver:
Mazarei V. Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1957/57962.
Council of Science Editors:
Mazarei V. Synergistic Effects of Alkali Silica Reaction (ASR) and Fly Ash on the Corrosion Characteristics of Reinforced Concrete Systems. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/57962
20.
Chandrasekhar, Morampudi.
Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels.
Degree: Civil Engineering, 2013, Jawaharlal Nehru Technological University, Hyderabad
URL: http://shodhganga.inflibnet.ac.in/handle/10603/19937
► The development of Self Compacting Concrete (SCC) is described by the Concrete Society and Building Research Establishment (BRE) newlineas a quiet revolution in the construction…
(more)
▼ The development of Self Compacting Concrete (SCC)
is described by the Concrete Society and Building Research
Establishment (BRE) newlineas a quiet revolution in the
construction industry resulting in massive usage of SCC worldwide.
Incorporation of fibres has further enhanced the strength and
durability of the properties of SCC. The fibres include
newlinesteel, nylon, poly-propylene, glass, Carbon and so on.
Further, hybridization of different typs of fibres proved to be
more effective. Hybridization of fibres means using a combination
of two or more newlinedifferent types of fibres. In the earlier
days, wall panels were mostly used for newlineenvironmental
protection ignoring its structural capacity. But in the recent
years, reinforced concrete walls have been used as integral part of
structural system to resist lateral and seismic loads and they
gained popularity in the construction of ultistoreyed buildings. It
is observed that not much work has been done on the behaviour of
fibre reinforced SCC walls as structural members.
newline
Appendix p 170-185 , Reference P.
187-205
Advisors/Committee Members: Rao, M V Seshagiri, Janardhana, M.
Subjects/Keywords: Behaviour; Compacting; Concrete; Panels; Reinforced
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APA (6th Edition):
Chandrasekhar, M. (2013). Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels. (Thesis). Jawaharlal Nehru Technological University, Hyderabad. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/19937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chandrasekhar, Morampudi. “Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels.” 2013. Thesis, Jawaharlal Nehru Technological University, Hyderabad. Accessed April 11, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/19937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chandrasekhar, Morampudi. “Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels.” 2013. Web. 11 Apr 2021.
Vancouver:
Chandrasekhar M. Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels. [Internet] [Thesis]. Jawaharlal Nehru Technological University, Hyderabad; 2013. [cited 2021 Apr 11].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/19937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chandrasekhar M. Behaviour of Fibre reinforced Self-Compacting concrete
and its application as wall Panels. [Thesis]. Jawaharlal Nehru Technological University, Hyderabad; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/19937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
21.
Mbewe, Peter Binali Kamowa.
Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars.
Degree: MScEng, Civil Engineering, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/18088
► ENGLISH ABSTRACT: There is an increasing demand for the development and use of innovative materials with reduced cost of construction while offering improved structural properties.…
(more)
▼ ENGLISH ABSTRACT: There is an increasing demand for the development and use of innovative materials with
reduced cost of construction while offering improved structural properties. Steel fibre
reinforced concrete (SFRC) can be used as a structural material to substitute the conventional
reinforcing bars partially or fully. However, there is little or no codified approach on the
design procedures for SFRC members in the latest guidelines outlined in the draft 2010
Model code.
It is against this background that analytical methods are derived in this study for the
determination of the flexural capacity of strain-softening, deflection-hardening SFRC with
and without steel reinforcing bars. Models used for the determination of the flexural capacity
of SFRC rectangular sections are based on equivalent stress blocks for both compression and
tensile stresses. These are derived from an elastic-perfect plastic model for compression and
either an elastic-constant post-peak response or Rilem’s multi-linear model for tension, in
which strain compatibility and force equilibrium theories are used. By employing the
equivalent stress blocks for both tensile and compressive stress states, parameters are defined
by converting the actual stress-strain distribution to an equivalent stress block, depending on
the ratio of yield (or cracking) strain and post-yield (post-cracking) strains. Due to the
simplicity of a drop-down tensile model and a bilinear compression model, these material
models are used for the subsequent derivation of the flexural models for both SFRC with and
without steel reinforcing bars.
An experimental program is designed and executed for model verification. This includes
material characterisation experiments for the determination of material model input
parameters, and main beam flexural experiments for the determination of the beam bending
capacity. An indirect tensile test is used for the characterisation of the tensile behaviour while
a four-point bending test is used for beam bending behaviour.
Both flexural models for SFRC with and without reinforcing bars have been verified to fairly
predict the flexural capacity of the beams. However, the flexural model for SFRC with steel
bars offers some challenges as to whether the synergetic effect of using both steel bars and
steel fibres should be incorporated at the low fibre volumes as used in the verification
exercise. Furthermore, the use of indirect methods to characterise tensile behaviour added
some uncertainties in the material model parameters and hence may have affected the
predictability of the model. More research on the verification of the models is required to
enable the use of a wider concrete strength spectrum for the verification and possible
modification of the models. Studies on the model uncertainty may also help determine the
reliable safety factor for the use of the model in predicting design strength of beam sections at
a prescribed reliability index.
AFRIKAANSE OPSOMMING: Daar is ‘n groeiende aanvraag na die…
Advisors/Committee Members: Van Zijl, G. P. A. G., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Civil engineering; Fiber-reinforced concrete
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APA (6th Edition):
Mbewe, P. B. K. (2011). Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/18088
Chicago Manual of Style (16th Edition):
Mbewe, Peter Binali Kamowa. “Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars.” 2011. Masters Thesis, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/18088.
MLA Handbook (7th Edition):
Mbewe, Peter Binali Kamowa. “Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars.” 2011. Web. 11 Apr 2021.
Vancouver:
Mbewe PBK. Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars. [Internet] [Masters thesis]. Stellenbosch University; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/18088.
Council of Science Editors:
Mbewe PBK. Development of analytical flexural models for steel fibre-reinforced concrete beams with and without steel bars. [Masters Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/18088
Stellenbosch University
22.
Combrinck, Riaan.
Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete.
Degree: Civil Engineering, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/6572
► Thesis (MScEng (Civil Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: Plastic shrinkage cracking (PSC) is the cracking caused by the early age shrinkage of concrete…
(more)
▼ Thesis (MScEng (Civil Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: Plastic shrinkage cracking (PSC) is the cracking caused by the early age shrinkage of concrete
within the first few hours after the concrete has been cast. It results in unsightly surface
cracks that serve as pathways whereby corroding agents can penetrate the concrete which
shortens the expected service life of a structure. PSC is primarily a problem at large exposed
concrete surfaces for example bridge decks and slabs placed in environmental conditions
with high evaporation rates.
Most precautionary measures for PSC are externally applied and aimed to reduce the
water loss through evaporation. The addition of a low dosage of polymeric fibres to
conventional concrete is an internal preventative measure which has been shown to reduce
PSC. The mechanisms involved with PSC in conventional and low volume fibre reinforced
concrete (LV-FRC) are however not clearly understood. This lack of knowledge and guidance
leads to neglect and ineffective use of preventative measures. The objective of this study is
to provide the fundamental understanding of the phenomena of PSC. To achieve the
objective, an in depth background study and experiments were conducted on fresh
conventional concrete and LV-FRC.
The three essential mechanisms required for PSC are: 1→ Capillary pressure build-up
between the particles of the concrete is the source of shrinkage. 2→ Air entry into a
concrete initiates cracking. 3→ Restraint of the concrete is required for crack forming.
The experiments showed the following significant findings for conventional and
LV-FRC: PSC is only possible once all the bleeding water at the surface has evaporated and
once air entry has occurred. The critical period where the majority of the PSC occurs is
between the initial and final set of concrete. Any preventative measure for PSC is most
effective during this period. The bleeding characteristics of a mix have a significant influence
on PSC. Adding a low volume of polymeric fibres to concrete reduces PSC due to the added
resistance that fibres give to crack widening, which increases significantly from the start of
the critical period.
The fundamental knowledge gained from this study can be utilized to develop a
practical model for the design and prevention of PSC in conventional concrete and LV-FRC.
AFRIKAANSE OPSOMMING: Plastiese krimp krake (PSK) is die krake wat gevorm word a.g.v. die vroeë krimping van beton
binne die eerste paar ure nadat die beton gegiet is. Dit veroorsaak onooglike oppervlak
krake wat dien as kanale waardeur korrosie agente die beton kan binnedring om so die
dienstydperk van die struktuur te verkort. Dit is hoofsaaklik ʼn probleem by groot
blootgestelde beton oppervlaktes soos brug dekke en blaaie wat gegiet is in klimaat
kondisies met hoë verdamping tempo’s.
Meeste voorsorgmaatreëls vir PSK word ekstern aangewend en beperk die water
verlies as gevolg van verdamping. Die byvoeging van ʼn lae volume polimeriese vesels is ʼn
…
Advisors/Committee Members: Boshoff, W. P., University of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Civil engineering; Fiber-reinforced concrete
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Combrinck, R. (2011). Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/6572
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Combrinck, Riaan. “Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete.” 2011. Thesis, Stellenbosch University. Accessed April 11, 2021.
http://hdl.handle.net/10019.1/6572.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Combrinck, Riaan. “Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete.” 2011. Web. 11 Apr 2021.
Vancouver:
Combrinck R. Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete. [Internet] [Thesis]. Stellenbosch University; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10019.1/6572.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Combrinck R. Plastic shrinkage cracking in conventional and low volume fibre reinforced concrete. [Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/6572
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
23.
Tu, Lin.
Development of surface fluorinated polypropylene fibres for use in concrete.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/9436
► D.Ing. (Civil Engineering)
Polypropylene (PP) fibre is one of the most widely used fibres for reinforcing concrete. Due to its unique material properties such as…
(more)
▼ D.Ing. (Civil Engineering)
Polypropylene (PP) fibre is one of the most widely used fibres for reinforcing concrete. Due to its unique material properties such as economic production cost, relatively high melting point and alkaline resistance, PP fibres in concrete are found to increase the toughness, provide restrained plastic and drying shrinkage cracking resistance, increase impact resistance and flexural loading capacity (especially during the post-crack stage) of concrete structures and components. The wettability of PP fibre surfaces is poor due to the hydrophobic surface nature of polypropylene. The bonding between the PP fibre and the concrete matrix is recognized as poor and currently the PP fibre / concrete interfacial bonding depends upon interlocking and keying (mechanical bonding). As the interfacial bond strength between the PP fibre and the concrete is much smaller than the tensile strength of PP fibre and concrete, in order to fully explore the reinforcing effect of PP fibres in concrete, further improvement of interfacial bonding is necessary. In this investigation, the research work was conducted on the surface oxyfluorinated PP fibre newly developed by the Atomic Energy Corporation of South Africa Limited. Examining the feasibility of using this fibre in concrete, as well as evaluating its superiority over unmodified PP fibres, is the key task of this investigation. This new type of oxyfluorinated PP fibre shows a large increase in interfacial bond strength compared to the unmodified PP fibres. The surface free energy concept and Lewis acid-base interfacial interaction theory were innovatively used to examine the interfacial bonding between the PP fibre and the concrete matrix. The purpose of this study was to develop the background of such oxyfluorinated PP fibres, to establish the mechanism of the increase in interfacial bonding and to investigate the basic properties of the concrete incorporating oxyfluorinated PP fibres. The experimental results on the properties of oxyfluorinated PP fibre reinforced concrete compared with those of unmodified PP fibre reinforced concrete and plain concrete are presented, with some field test results focused on the improvement in shrinkage cracking control capacity. It is concluded in this investigation that the surface oxyfluorinated PP fibres possess significantly increased PP fibre / concrete interfacial bonding due to the chemical bond arising from the acid base interfacial interaction and the intimate interfacial contact arising from the improved fibre surface wettability. When combining oxyfluorinated pp fibre with concrete, a general improvement in the physical and mechanical properties of fibrous concrete compared to that created with unmodified PP fibres, is obtained.
Subjects/Keywords: Reinforced concrete; Polypropylene fibers
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APA (6th Edition):
Tu, L. (2014). Development of surface fluorinated polypropylene fibres for use in concrete. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9436
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tu, Lin. “Development of surface fluorinated polypropylene fibres for use in concrete.” 2014. Thesis, University of Johannesburg. Accessed April 11, 2021.
http://hdl.handle.net/10210/9436.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tu, Lin. “Development of surface fluorinated polypropylene fibres for use in concrete.” 2014. Web. 11 Apr 2021.
Vancouver:
Tu L. Development of surface fluorinated polypropylene fibres for use in concrete. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/10210/9436.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tu L. Development of surface fluorinated polypropylene fibres for use in concrete. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9436
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
24.
Getzlaf, Douglas Donald.
An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams.
Degree: 2012, University of Toronto
URL: http://hdl.handle.net/1807/33212
► Non-corroding materials, such as Fibre-Reinforced Polymer (FRP) bars, are now being used as reinforcement for reinforced concrete structures in order to extend their lifetime and…
(more)
▼ Non-corroding materials, such as Fibre-Reinforced Polymer (FRP) bars, are now being used as reinforcement for reinforced concrete structures in order to extend their lifetime and minimize maintenance costs. Because of the softer and brittle behaviour of GFRP bars, behaviour of structural members reinforced with this material is different than that of steel-reinforced members. In this study, 16 GFRP reinforced beams were constructed and tested under flexure and shear loads to failure. Effects of different variables, such as amount of longitudinal and lateral reinforcements, type of bars and concrete strength, were investigated for their effects. The flexural provisions of design codes, namely CSA S806-12, CSA S6-06, and report ACI 440.1R-06, were evaluated against the test data. The main provisions investigated are failure modes, ultimate strength, moment-curvature response, deflection, crack widths, and deformability.
MAST
Advisors/Committee Members: Sheikh, Shamim A., Civil Engineering.
Subjects/Keywords: Structural Engineering; Reinforced Concrete; 0543
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APA (6th Edition):
Getzlaf, D. D. (2012). An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/33212
Chicago Manual of Style (16th Edition):
Getzlaf, Douglas Donald. “An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams.” 2012. Masters Thesis, University of Toronto. Accessed April 11, 2021.
http://hdl.handle.net/1807/33212.
MLA Handbook (7th Edition):
Getzlaf, Douglas Donald. “An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams.” 2012. Web. 11 Apr 2021.
Vancouver:
Getzlaf DD. An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1807/33212.
Council of Science Editors:
Getzlaf DD. An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33212
University of Toronto
25.
Wu, Sixian.
Rational Modeling of Arching Action in Laterally Restrained Beams.
Degree: 2013, University of Toronto
URL: http://hdl.handle.net/1807/35148
► It is well known that arching action in reinforced concrete slabs resulting from surrounding restraining elements is responsible for much greater collapse loads than those…
(more)
▼ It is well known that arching action in reinforced concrete slabs resulting from surrounding restraining elements is responsible for much greater collapse loads than those estimated considering flexural effects only. However, the subject needs to be better understood and simplified if it is to be reliably applied in broader practice. This thesis presents a rational treatment of the problem. By limiting the scope of investigation to one-way slab systems, for the first time an explicit method of calculating the load-carrying capacity of elastic- plastic slab strips with a laterally rigidly restrained boundary condition is derived. Application of the proposed model to specimens selected from four experiment programs proves its reliability in ultimate strength calculations. The proposed model is then employed in a parametric study of structural responses of deck slab strips. The parametric study shows that a longer span, lightly reinforced deck slab system is still adequate in strength if it is cast in higher strength concrete and sufficient lateral restraint is available.
MAST
Advisors/Committee Members: Gauvreau, Douglas Paul, Civil Engineering.
Subjects/Keywords: Arching Action; Reinforced Concrete; 0543
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APA (6th Edition):
Wu, S. (2013). Rational Modeling of Arching Action in Laterally Restrained Beams. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/35148
Chicago Manual of Style (16th Edition):
Wu, Sixian. “Rational Modeling of Arching Action in Laterally Restrained Beams.” 2013. Masters Thesis, University of Toronto. Accessed April 11, 2021.
http://hdl.handle.net/1807/35148.
MLA Handbook (7th Edition):
Wu, Sixian. “Rational Modeling of Arching Action in Laterally Restrained Beams.” 2013. Web. 11 Apr 2021.
Vancouver:
Wu S. Rational Modeling of Arching Action in Laterally Restrained Beams. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1807/35148.
Council of Science Editors:
Wu S. Rational Modeling of Arching Action in Laterally Restrained Beams. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/35148
Oregon State University
26.
Goodall, Joshua K.
Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders.
Degree: MS, Civil Engineering, 2010, Oregon State University
URL: http://hdl.handle.net/1957/16280
► Large numbers of vintage reinforced concrete deck-girder bridges remain in the national bridge inventory. Many of these exhibit diagonal cracking and other distress. Due to…
(more)
▼ Large numbers of vintage
reinforced concrete deck-girder bridges remain in the national bridge inventory. Many of these exhibit diagonal cracking and other distress. Due to the design practices of the time, it is common to observe cracks at locations where flexural reinforcing steel is terminated along the span. The presence of diagonal cracking increases the demand in the flexural steel and some details may be susceptible to anchorage failure. Recent developments in load rating using Load and Resistance Factor Rating (LRFR), which incorporates Modified Compression Field Theory (MCFT), require a check of the flexural
steel in the presence of shear. This practice has resulted in tensile anchorage or flexural capacity checks controlling some load ratings. Previous tests performed by OSU indicate that
failure for many girders exhibiting steep initial diagonal cracking is eventually controlled by shear-moment interaction which evolves into a much more shallow crack at failure. It is
hypothesized that this is due to an underestimation of the bond stress in developing bars. To test this hypothesis, four full-scale tests were performed on specimens with a pre-cast crack
and cutoff tensile bars. These tests indicate that the bond stress in the developed bars is greater than that predicted by current specifications. Failure behavior and subsequent load-induced cracking of each specimen was found to be independent of the initial diagonal cracking. Analysis indicates that current code procedures are sufficient to predict failure modes. However this must be done using a more appropriate estimate of bond stress.
Advisors/Committee Members: Higgins, Christopher C (advisor), Miller, Thomas (committee member).
Subjects/Keywords: Reinforced; Concrete bridges – Cracking
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APA (6th Edition):
Goodall, J. K. (2010). Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16280
Chicago Manual of Style (16th Edition):
Goodall, Joshua K. “Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders.” 2010. Masters Thesis, Oregon State University. Accessed April 11, 2021.
http://hdl.handle.net/1957/16280.
MLA Handbook (7th Edition):
Goodall, Joshua K. “Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders.” 2010. Web. 11 Apr 2021.
Vancouver:
Goodall JK. Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1957/16280.
Council of Science Editors:
Goodall JK. Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16280
Florida Atlantic University
27.
Balasubramanian, Hariharan.
INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS.
Degree: 2019, Florida Atlantic University
URL: http://fau.digital.flvc.org/islandora/object/fau:41321
► This research was conducted to better understand the corrosion propagation stage on dry-cast reinforced concrete pipes (DCRCPs) while exposed to high moisture conditions and chlorides.…
(more)
▼ This research was conducted to better understand the corrosion propagation stage on dry-cast reinforced concrete pipes (DCRCPs) while exposed to high moisture conditions and chlorides. Corrosion initiation and propagation were studied in instrumented specimens obtained from segments of dry-cast reinforced concrete pipes. All specimens were subjected to accelerated chloride transport by the application of an electric field. Corrosion of the steel wire mesh initiated after a few days to a few months rather than several years. The specimens were then transferred to high moisture environments (immersed in water, high humidity and/or covered with wet sand) during the corrosion propagation stage. Reinforcement potentials, linear polarization resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS) measurements were carried out periodically. During the propagation stage in different exposures, reinforcement eventually reached negative potentials values (< –-0.55 Vsce), which suggest mass transfer limitations. These specimens showed no visual signs of corrosion such as cracks or corrosion products except the ones exposed to high humidity and laboratory environments; where some corrosion products have reached the concrete surface. Moreover, the apparent corrosion rate values obtained suggest high corrosion rates. No crack appearance on specimens exposed to other conditions could be explained by the porosity of the specimens; the corrosion products moved into saturated pores. It is speculated that although there might be mass transfer limitations present, the current demanded by the anode is being balanced by a larger cathode area due to macrocell effects since the high moisture conditions likely reduced the concrete resistivity and increased the throwing power. The corrected polarization resistance (Rc) was calculated by subtracting the solution resistance from the apparent polarization resistance measured. The Rc values measured over time were used to obtain the calculated mass loss (using Faraday’s Law). Most specimens were forensically analyzed and the measured mass loss compared to the calculated mass loss. The forensic examination includes the measurement of the actual corroding areas. The measured corroding areas were used to obtain corrosion current density (icorr) values. A comparison was made of the calculated corrosion current densities obtained using the linear polarization resistance method (LPR) and the extrapolation method from cyclic polarization tests. It was evident that most of the specimens’ corrosion rates were significantly high. The corrosion products filled the wet-pores inside the concrete and provide an explanation for no cracks or corrosion bleed outs being visually observed on the specimens.
2019
Degree granted: Dissertation (Ph.D.) – Florida Atlantic University, 2019.
Collection: FAU
Advisors/Committee Members: Presuel-Moreno, Francisco (Thesis advisor), Florida Atlantic University (Degree grantor), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering.
Subjects/Keywords: Reinforced concrete; Corrosion; Environmental effects
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APA (6th Edition):
Balasubramanian, H. (2019). INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS. (Thesis). Florida Atlantic University. Retrieved from http://fau.digital.flvc.org/islandora/object/fau:41321
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Balasubramanian, Hariharan. “INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS.” 2019. Thesis, Florida Atlantic University. Accessed April 11, 2021.
http://fau.digital.flvc.org/islandora/object/fau:41321.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Balasubramanian, Hariharan. “INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS.” 2019. Web. 11 Apr 2021.
Vancouver:
Balasubramanian H. INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS. [Internet] [Thesis]. Florida Atlantic University; 2019. [cited 2021 Apr 11].
Available from: http://fau.digital.flvc.org/islandora/object/fau:41321.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Balasubramanian H. INITIATION AND PROPAGATION OF CORROSION IN DRY-CAST REINFORCED CONCRETE PIPES WITH ENVIRONMENTAL EFFECTS. [Thesis]. Florida Atlantic University; 2019. Available from: http://fau.digital.flvc.org/islandora/object/fau:41321
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
28.
Van der Have, R.C. (author).
Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:25780e9a-49c4-4085-9a65-af73119d97a7
► With more advanced methods and increasing computational power, the simulation of reinforced concrete in a Finite Element Analysis (FEA) has become more and more realistic.…
(more)
▼ With more advanced methods and increasing computational power, the simulation of
reinforced concrete in a Finite Element Analysis (FEA) has become more and more realistic. In a non-linear analysis of
reinforced concrete, cracking behaviour and the maximum load-capacity can be determined. Such analyses sometimes suffer from unstable behaviour, especially when large parts of the structure crack at the same time. It is expected that spatially varying
concrete material properties will affect crack initialization, crack patterns and the stability of the analysis. In this report, the use of spatial variability in the material properties of
concrete in a Finite Element Analysis (FEA) was investigated. To incorporate spatial variation in the Finite Element method (FEM), discretized random fields are used which are assigned to elements or integration points in the Finite Element (FE) model. In this research the following methods are implemented and have been assessed on their performance: Covariance Matrix Decomposition method (CMD), Fast Fourier Transform method (FFT), Local Avarage Subdivision method (LAS) and Expansion Optimal Linear Estimation method (EOLE). To be appropriate for the implementation in a general purpose FEM program the method has to be efficient with respect to computation time, accurate in representing the statistical characteristics of
concrete and easy to implement in the program. In a literature review, a large variation was found in the used values for the statistical characteristics which are involved in the modelling of the spatial variation of
concrete properties. In the assessment of the random field generators this range of values was used as input. From literature and the assessment it was found that the CMD method is easy to implement and is the most accurate in representing the statistical characteristics of
concrete. With respect to efficiency, the method performs poorly when the number of nodes increases. This is the case for random fields in multiple dimensions and/or for random fields with a small correlation length. The FFT method is slightly less accurate but performs very well with respect to efficiency when the number of nodes increase. The derivation of the one sided Spectral Density Function (SDF), which is needed in the FFT method, is however quite difficult. The threshold value in the correlation function and the distribution type have the largest influence on the accuracy of the random field. If the threshold value increases, and a log-normal distribution type with a high coefficient of variation (COV) is selected, the accuracy of the different methods decreases. The FFT method is slightly more accurate in representing the statistical characteristics in that case. With a large correlation length and a threshold value, the values in the random field are strongly correlated. It was found that in such a case the assumption of ergodicity does not hold any more. In the general purpose FEM program DIANA, a random field application has been developed. The guidelines in the JCSS…
Advisors/Committee Members: Hendriks, M.A.N. (mentor), Hicks, M.A. (mentor), Roy, A. (mentor), Schreppers, G.M.A. (mentor).
Subjects/Keywords: Random Fields; Reinforced Concrete; JCSS
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APA (6th Edition):
Van der Have, R. C. (. (2015). Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:25780e9a-49c4-4085-9a65-af73119d97a7
Chicago Manual of Style (16th Edition):
Van der Have, R C (author). “Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete.” 2015. Masters Thesis, Delft University of Technology. Accessed April 11, 2021.
http://resolver.tudelft.nl/uuid:25780e9a-49c4-4085-9a65-af73119d97a7.
MLA Handbook (7th Edition):
Van der Have, R C (author). “Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete.” 2015. Web. 11 Apr 2021.
Vancouver:
Van der Have RC(. Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Apr 11].
Available from: http://resolver.tudelft.nl/uuid:25780e9a-49c4-4085-9a65-af73119d97a7.
Council of Science Editors:
Van der Have RC(. Random Fields for Non-Linear Finite Element Analysis of Reinforced Concrete. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:25780e9a-49c4-4085-9a65-af73119d97a7
Michigan State University
29.
Blanchard, Charles M.
Tests of steel-concrete beams.
Degree: B.S., 1903, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:48899
Subjects/Keywords: Reinforced concrete
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APA (6th Edition):
Blanchard, C. M. (1903). Tests of steel-concrete beams. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:48899
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Blanchard, Charles M. “Tests of steel-concrete beams.” 1903. Thesis, Michigan State University. Accessed April 11, 2021.
http://etd.lib.msu.edu/islandora/object/etd:48899.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Blanchard, Charles M. “Tests of steel-concrete beams.” 1903. Web. 11 Apr 2021.
Vancouver:
Blanchard CM. Tests of steel-concrete beams. [Internet] [Thesis]. Michigan State University; 1903. [cited 2021 Apr 11].
Available from: http://etd.lib.msu.edu/islandora/object/etd:48899.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Blanchard CM. Tests of steel-concrete beams. [Thesis]. Michigan State University; 1903. Available from: http://etd.lib.msu.edu/islandora/object/etd:48899
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan State University
30.
Coffron, William James.
An analysis of bond stress between Hi-Bond bars and concrete.
Degree: B.S., 1949, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:39590
Subjects/Keywords: Reinforced concrete
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APA (6th Edition):
Coffron, W. J. (1949). An analysis of bond stress between Hi-Bond bars and concrete. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:39590
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Coffron, William James. “An analysis of bond stress between Hi-Bond bars and concrete.” 1949. Thesis, Michigan State University. Accessed April 11, 2021.
http://etd.lib.msu.edu/islandora/object/etd:39590.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Coffron, William James. “An analysis of bond stress between Hi-Bond bars and concrete.” 1949. Web. 11 Apr 2021.
Vancouver:
Coffron WJ. An analysis of bond stress between Hi-Bond bars and concrete. [Internet] [Thesis]. Michigan State University; 1949. [cited 2021 Apr 11].
Available from: http://etd.lib.msu.edu/islandora/object/etd:39590.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Coffron WJ. An analysis of bond stress between Hi-Bond bars and concrete. [Thesis]. Michigan State University; 1949. Available from: http://etd.lib.msu.edu/islandora/object/etd:39590
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations