United States Department of Transportation
i
Presentation for new binder tests and specification change workshop.
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2014-06-18
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[PDF-4.08 MB]
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Abstract:The research team of the Texas A&M Transportation Institute (TTI) developed and taught a new asphalt binder test workshop, which was held at the Cedar Park branch of the Texas Department of Transportation (TxDOT) on June 18, 2014. The focus of the workshop was to identify a simple, practical fatigue type of test for asphalt binders, since the cracking issue is the most critical problem pavement engineers are facing every day. It was found that the linear amplitude sweep (LAS) test is a very promising fracture test for evaluating fatigue cracking resistance of asphalt binders at intermediate temperature. Both laboratory mixture tests and field test sections have been employed to validate this binder fatigue cracking test. The mixture fracture test results showed that the LAS test has a reasonable correlation with the Overlay test, which is the standard mixture test for cracking resistance of asphalt mixtures in Texas. Field test sections are still being monitored, and the field observation will be critical for the final validation of the LAS test. The workshop presentation is presented.
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