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You searched for subject:(Physical sulfate attack). Showing records 1 – 2 of 2 total matches.

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University of Texas – Austin

1. Lowe, Travis Evans. An investigative study on physical sulfate attack and alkali-silica reaction test methods.

Degree: Civil, Architectural, and Environmental Engineering, 2011, University of Texas – Austin

This thesis is unique in that it investigated two completely different forms of concrete deterioration: physical sulfate attack and the alkali-silica reaction (ASR). Research was undertaken to better understand physical sulfate attack in order to provide much needed guidance on how to prevent durable this form of deterioration. A testing regime was designed to evaluate and analyze different concrete mixtures with varying water to cementitious material ratios (w/cm), cement types (Type I and V), and use of supplementary cementing materials (SCMs) in accelerated laboratory exposure and outdoor exposure testing. The accelerated laboratory testing evaluated the performance of concrete cylinder segments fully submerged in 30% (by mass of solution) sodium sulfate solution exposed to a temperature and humidity cycle that would promote cycles of alternative conversion between anhydrous sodium sulfate (thenardite) and decahydrate sodium sulfate (mirabilite). In the outdoor exposure site, two different sized concrete cylinders per mixture proportion were partially submerged in 5% (33,000 ppm) sodium sulfate solution and exposed to alternative wetting and drying conditions, along with, temperature fluctuations that would promote conversion between thenardite (Na2SO4) and mirabilite (Na2SO4∙10H2O). With regard to ASR test methods, it has been shown with past research that it is not possible to evaluate “job mixtures” or determine alkali thresholds using ASTM C 1293 (Concrete Prism Test) with evaluating aggregates and concrete mixture proportions for the susceptibility of ASR when testing job mixtures. The most commonly cited issue with the concrete prism test is excessive leaching of alkalis during the course of the test, which may not be a major issue when using the standard, high-alkali concrete mixtures as per ASTM C 1293 but is clearly an issue when testing lower-alkali concrete mixtures. For low-alkali mixtures, alkali leaching can reduce the internal alkali content below the threshold that triggers expansion for a given aggregate. A comprehensive study was initiated that evaluated various modifications to ASTM C 1293, with the intention of developing a testing regime better suited to testing “job mixes” and/or low-alkali concrete mixtures. Advisors/Committee Members: Folliard, Kevin J. (advisor).

Subjects/Keywords: Physical sulfate attack; Physical salt attack; Alkali-silica reaction; Concrete prism test; ASTM c1293; ASTM C 1293; Alkali-silica reaction test methods

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lowe, T. E. (2011). An investigative study on physical sulfate attack and alkali-silica reaction test methods. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-3339

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):

Lowe, Travis Evans. “An investigative study on physical sulfate attack and alkali-silica reaction test methods.” 2011. Thesis, University of Texas – Austin. Accessed July 17, 2019. http://hdl.handle.net/2152/ETD-UT-2011-05-3339.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lowe, Travis Evans. “An investigative study on physical sulfate attack and alkali-silica reaction test methods.” 2011. Web. 17 Jul 2019.

Vancouver:

Lowe TE. An investigative study on physical sulfate attack and alkali-silica reaction test methods. [Internet] [Thesis]. University of Texas – Austin; 2011. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3339.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lowe TE. An investigative study on physical sulfate attack and alkali-silica reaction test methods. [Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3339

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Rahman, Md. Mahbubur. Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions.

Degree: Civil Engineering, 2014, University of Manitoba

There are still research gaps regarding the effects of key parameters such as water-to-cementitious materials ratio (w/cm), type of binder and pore structure characteristics on the response of concrete to special forms of sulfate attack: physical salt attack (PSA) and thaumasite sulfate attack (TSA). Hence, this study aims at developing an innovative type of concrete: nano-modified fly ash concrete, incorporating various dosages of nano-silica (NS) or nano-alumina (NA) and fly ash, and explores its efficiency in resisting various forms of sulfate attack. Advisors/Committee Members: Bassuoni, Mohamed T. (Civil Engineering) (supervisor), El-Salakawy, Ehab (Civil Engineering) Ojo, Olanrewaju (Mechanical Engineering) (examiningcommittee).

Subjects/Keywords: Durability; Nanoparticles; Fly ash; Physical salt attack; Conventional sulfate attack; Thaumasite sulfate attack

sulfate attack on concrete can occur due to physical and chemical interactions between various… …attack, physical salt attack (PSA) and thaumasite sulfate attack (TSA) is… …this thesis is on special forms of sulfate attack: physical salt attack (PSA) and… …thaumasite sulfate attack (TSA). 12 2.2. Physical Salt Attack (PSA) 2.2.1… …physical salt attack (PSA)’ for this type of damage, which might be caused by sulfate… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Rahman, M. M. (2014). Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/24055

Chicago Manual of Style (16th Edition):

Rahman, Md Mahbubur. “Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions.” 2014. Masters Thesis, University of Manitoba. Accessed July 17, 2019. http://hdl.handle.net/1993/24055.

MLA Handbook (7th Edition):

Rahman, Md Mahbubur. “Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions.” 2014. Web. 17 Jul 2019.

Vancouver:

Rahman MM. Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions. [Internet] [Masters thesis]. University of Manitoba; 2014. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/1993/24055.

Council of Science Editors:

Rahman MM. Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions. [Masters Thesis]. University of Manitoba; 2014. Available from: http://hdl.handle.net/1993/24055

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