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Articles 61 - 64 of 64
Full-Text Articles in Civil Engineering
Seasonal And Spatial Variation Of Subgrade Response, Mustaque Hossain, Stefan Romanoschi, Andrew J. Gisi
Seasonal And Spatial Variation Of Subgrade Response, Mustaque Hossain, Stefan Romanoschi, Andrew J. Gisi
Civil Engineering Faculty Publications - Archive
Temperature, subgrade moisture content, and Falling Weight Defleetometer (FWD)-deflection data were collected monthly on four asphalt pavement test sections in Kansas for a year. The subgrade moduli were baekealeulated using the elastic layer theory. It was found that for almost all sites, the monthly variation in subgrade moisture content was not very significant over the seasons. The patterns of subgrade response, in terms of subgrade moduli versus time, simulated sine-shaped forms signifying a possible temperature effect. Higher variabilities across the site were associated with the extreme temperature conditions, usually very low or high average pavement temperatures. In all cases, the …
Conditions For Stripping Using Accelerated Testing, Changlin Pan, Thomas D. White
Conditions For Stripping Using Accelerated Testing, Changlin Pan, Thomas D. White
JTRP Technical Reports
A laboratory study was conducted to determine water sensitivity and rutting potential of asphalt mixtures. Two major tests were included in the study: AASHTO T-283 and a laboratory wheel tracking device (PURWheel). AASHTO T-283 has been adopted in the Superpave system for evaluating mixture stripping potential. The PURWheel device and test method was developed with the concept creating conditions associated with stripping, i.e. moisture, high temperature, and a moving wheel load. The laboratory wheel track tests can be conducted with hot/wet or hot/dry environments. The objective of the study is to determine the factors that most influence bituminous mixture stripping …
Minimum Crushed Aggregate Requirements, Haiming Huang, Thomas D. White
Minimum Crushed Aggregate Requirements, Haiming Huang, Thomas D. White
JTRP Technical Reports
An accelerated pavement testing facility has been developed by Purdue University for the Indiana Department of Transportation. The test facility includes a test pit in which prototype scale pavement sections can be installed. The Accelerated Pavement Tester loading system has the capability of applying moving wheel loads to the test sections. An initial study utilizing the accelerated pavement test facility has been conducted at Purdue University to determine the minimum crushed aggregate requirements in asphalt mixtures in Indiana. This study addresses effects of various constituents of the asphalt mixture on pavement rutting. The factors included in this study are aggregate …
Using Pyrolized Carbon Black (Pcb) From Waste Tires In Asphalt Pavement (Part 2, Asphalt Binder), Yongdong Zeng, C. W. Lovell
Using Pyrolized Carbon Black (Pcb) From Waste Tires In Asphalt Pavement (Part 2, Asphalt Binder), Yongdong Zeng, C. W. Lovell
JTRP Technical Reports
Scrap tires derived from automobiles have become a large environmental problem in the United States. In this study, research is carried out to investigate the potential use of tire-derived pyrolyzed carbon black from scrap tires as an asphalt cement modifier. The asphalt cements used in this research were AC10 and AC20. Penetration and softening point tests were performed to obtain the consistency of the asphalt cements. The pyrolyzed carbon black, as provided by Wolf Industries, was combined with the asphalt cement in the following percentages; 5%, 10%, 15% and 20%. Penetration, softening point and ductility tests were performed to determine …