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You searched for subject:(high friction surface). Showing records 1 – 3 of 3 total matches.

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Kansas State University

1. Zahir, Humaira. Performance of local aggregate in high friction surface treatment.

Degree: MS, Department of Civil Engineering, 2016, Kansas State University

Road surfaces may prematurely lose pavement friction due to polished aggregates on sharp horizontal curves, steep grades, or near intersections resulting in vehicle skidding. The problem gets exacerbated during wet weather. The Federal Highway Administration (FHWA) estimates that about 70% of wet pavement crashes can be prevented or minimized by improving pavement friction. High Friction Surface Treatment (HFST), a specially-designed thin surface application of hard aggregates and thermosetting resins like epoxy, has been proven to be an effective method to increase road surface friction. Calcined bauxite has been predominantly used in the United States as the hard aggregate in combination with an epoxy binder for HFST. However, this treatment is expensive since the calcined bauxite is imported. The objective of this study is to evaluate the performance of a local aggregate in HFST. Slab specimens of hot-mix asphalt (HMA) were compacted in the laboratory and treated with HFST systems incorporating both calcined bauxite and a local, hard aggregate, Picher Oklahoma flint aggregate. The treated HMA specimens were then tested with a Dynamic Friction Tester (DFT) and a Circular Track Meter (CTM) to determine the frictional coefficient and texture depth, respectively. Also, Hamburg Wheel Tracking Device Testing were conducted on these HFST systems to evaluate wearing resistance under repetitive wheel load. Field measurements of texture depths on HFST were also done. Statistical analysis was performed to compare the performance of high friction surfaces prepared with different aggregate epoxy combinations. The results show that flint aggregate can be a suitable substitute for the calcined bauxite in HFST. Field measurements also showed marked improvements in texture depth with HFST. Advisors/Committee Members: Mustaque A. Hossain.

Subjects/Keywords: Friction; Skid resistance; High friction surface treatment; Local aggregate

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

APA (6th Edition):

Zahir, H. (2016). Performance of local aggregate in high friction surface treatment. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/34562

Chicago Manual of Style (16th Edition):

Zahir, Humaira. “Performance of local aggregate in high friction surface treatment.” 2016. Masters Thesis, Kansas State University. Accessed August 25, 2019. http://hdl.handle.net/2097/34562.

MLA Handbook (7th Edition):

Zahir, Humaira. “Performance of local aggregate in high friction surface treatment.” 2016. Web. 25 Aug 2019.

Vancouver:

Zahir H. Performance of local aggregate in high friction surface treatment. [Internet] [Masters thesis]. Kansas State University; 2016. [cited 2019 Aug 25]. Available from: http://hdl.handle.net/2097/34562.

Council of Science Editors:

Zahir H. Performance of local aggregate in high friction surface treatment. [Masters Thesis]. Kansas State University; 2016. Available from: http://hdl.handle.net/2097/34562


Luleå University of Technology

2. Yousfi, Mohamed Amine. Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel.

Degree: 2011, Luleå University of Technology

High strength boron steels are commonly used as structural reinforcements or energy absorbing systems in automobile applications due to their favourable strength to weight ratios. The high strength of these steels leads to several problems during forming such as poor formability, increased spring back, and tendency to work-harden. In view of these difficulties, high strength boron steels are usually formed by press hardening at elevated temperatures with a view to facilitate forming and simultaneous hardening by quenching of complex shaped parts.The high strength steel sheets are used with an Al–Si coating with a view e.g. to prevent scaling of components during hot-metal forming. The Al-Si coated high strength steel can lead to problems with galling (i.e. material transfer from the coated sheet to the tool surface) which have a negative influence on the quality of the produced parts as well as the process economy. The available results in the open literature pertaining to high temperature galling are very scarce. With this in view, the friction and wear behaviours of different tool steel coatings and different roughness lay directions sliding against Al–Si-coated high-strength steel at elevated temperatures have been investigated by using a high-temperature reciprocating friction and wear tester at temperature of 900 °C.The results have shown that parallel sliding with respect to the surface roughness lay reduces the severity of galling compared to perpendicular sliding. None of the coatings included in this study have shown beneficial effects in view of galling. The DLC coating experienced less galling compared to the AlCrN and TiAlN. Post polishing of the coated tool steel has resulted in more severe material transfer with higher and more unstable friction.

Validerat; 20111022 (anonymous)

Subjects/Keywords: Technology; Friction; Galling; Material transfer; High temperature; PVD coatings; Surface roughness; Teknik

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

APA (6th Edition):

Yousfi, M. A. (2011). Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-47706

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):

Yousfi, Mohamed Amine. “Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel.” 2011. Thesis, Luleå University of Technology. Accessed August 25, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-47706.

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

MLA Handbook (7th Edition):

Yousfi, Mohamed Amine. “Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel.” 2011. Web. 25 Aug 2019.

Vancouver:

Yousfi MA. Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel. [Internet] [Thesis]. Luleå University of Technology; 2011. [cited 2019 Aug 25]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-47706.

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

Council of Science Editors:

Yousfi MA. Influence of Surface Roughness Lay and Surface Coatings on Galling During Hot Forming of Al-Si Coated High Strength Steel. [Thesis]. Luleå University of Technology; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-47706

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


Virginia Tech

3. Roa, Julio Alberto. Evaluation of International Friction Index and High-Friction Surfaces.

Degree: MS, Civil Engineering, 2008, Virginia Tech

State highway agencies have an obligation to provide users with optimal surface conditions under various weather conditions throughout the year. A satisfactory pavement surface should exhibit good friction and texture depth to reduce roadway highway accidents. This is why friction is starting to receive increased attention in the pavement management process. There have been numerous research efforts by different countries and agencies to better understand the behavior of different friction testing devices and the influence of texture, speed, and other external conditions on their measurements. The first part of this thesis presents a research effort to compare and harmonize texture and skid resistance measurements taken with various devices on 24 pavement sections with a wide range of textures. Measurements were compared and the International Friction Index (IFI) calculated following PIARC and ASTM steps. The results revealed discrepancies in the IFI values calculated for the different devices, suggesting that the coefficients A, B, and C proposed by PIARC may need to be adjusted for each device considered before the IFI can be implemented by the surface properties consortium participating agencies. In this research the A, B, and C coefficients were then recalculated, and the predicted values of friction using these revised coefficients are presented. The coefficients developed were also used to obtain IFI values for high-friction surfaces (HFS). It has been found that under different conditions, different parameters and coefficients will result. It is strongly recommended equipment comparison experiments (like the NASA and Smart Road programs) continue to better determine the coefficients necessary for harmonization. HFS have emerged as viable high-friction pavement alternatives that mitigate the consequences of driver error, poor geometric alignment of the roadway, and insufficient friction at the tire-pavement interaction, especially during wet weather. This thesis presents a study of the HFS available in the U.S. market and their performance (friction and texture) in different applications, under different weather conditions, and in various locations. This thesis also presents the results of the benefit-cost analysis for the studied HFS. Advisors/Committee Members: Flintsch, Gerardo W. (committeechair), Wang, Linbing (committee member), Trani, Antonio A. (committee member).

Subjects/Keywords: high-friction surface; harmonization; International Friction Index; testing devices.; safety

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

APA (6th Edition):

Roa, J. A. (2008). Evaluation of International Friction Index and High-Friction Surfaces. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/36277

Chicago Manual of Style (16th Edition):

Roa, Julio Alberto. “Evaluation of International Friction Index and High-Friction Surfaces.” 2008. Masters Thesis, Virginia Tech. Accessed August 25, 2019. http://hdl.handle.net/10919/36277.

MLA Handbook (7th Edition):

Roa, Julio Alberto. “Evaluation of International Friction Index and High-Friction Surfaces.” 2008. Web. 25 Aug 2019.

Vancouver:

Roa JA. Evaluation of International Friction Index and High-Friction Surfaces. [Internet] [Masters thesis]. Virginia Tech; 2008. [cited 2019 Aug 25]. Available from: http://hdl.handle.net/10919/36277.

Council of Science Editors:

Roa JA. Evaluation of International Friction Index and High-Friction Surfaces. [Masters Thesis]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/36277

.