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- W651161005 abstract "An Accelerated Loading Facility (ALF) was used to validate the Superpave asphalt binder parameter for fatigue cracking, G*sin(delta). The ALF is a full-scale pavement testing machine that applies one-half of a single rear truck axle load. The speed of the ALF and the applied load were constant in this study. Two unmodified asphalt binders were used. These binders had Superpave performance grades (PGs) of 58-34 and 64-22, and continuous intermediate-temperature PGs of 9 and 17, respectively. Both asphalt binders were from the same crude source. A single aggregate gradation and a single asphalt binder content were used. Two asphalt pavement layer thicknesses were tested: 100 mm and 200 mm. Each pavement was tested at three temperatures: 28, 19, and 10 deg C. A total of 12 pavement sites (2 binders x 2 thicknesses x 3 temperatures) was tested by the ALF. The pavements failed sooner at the middle test temperature of 19 deg C for a given asphalt binder and asphalt pavement layer thickness. Neither the strain-control asphalt binder parameter, G*sin(delta), nor the stress-control asphalt binder parameter, G*/sin(delta), can, by itself, explain the effect of temperature. As expected, each 100-mm-thick pavement failed sooner than the 200-mm-thick pavement layer with the same asphalt binder and pavement test temperature. Only one of six comparisons used to evaluate the effect of asphalt binder grade on fatigue cracking performance showed that the mode of loading was strain control, which is the mode of loading used by the Superpave asphalt binder specification. Four of six comparisons indicated that the mode of loading was stress control, although the stress-control parameter, G*/sin(delta), could not explain the effect of test temperature on fatigue cracking performance. The sixth comparison was inconclusive in regards to the applicable mode of loading. The pavement data indicated that the mode of loading can change with temperature. The mode of loading for the 100-mm-thick pavements changed from strain to stress control with a change in temperature from 28 to 19 deg C. Fatigue cracks in all pavements started at the bottom of the asphalt pavement layer." @default.
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- W651161005 date "2002-10-01" @default.
- W651161005 modified "2023-09-23" @default.
- W651161005 title "VALIDATION OF THE SUPERPAVE ASPHALT BINDER FATIGUE CRACKING PARAMETER USING AN ACCELERATED LOADING FACILITY" @default.
- W651161005 hasPublicationYear "2002" @default.
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