Investigation of Cracking Resistance of Asphalt Mixtures and Binders

The Minnesota Road Research Project (MnROAD) and National Center for Asphalt Technology (NCAT) have formed a partnership to execute asphalt mixture performance testing experiments with a nationwide implementation impact. The MnROAD Cracking Group (CG) experiment is a 3-year pooled-fund project sponsored by five states including Illinois, Michigan, Minnesota, New York, and Wisconsin. The CG experiment at MnROAD will focus on low-temperature cracking, although there is a potential for other types of cracking such as fatigue and top-down. Construction will take place summer 2016. Minnesota Department of Transportation (MnDOT) is interested in investigating performance tests in addition to those investigated as part of the CG experiment. These additional test methods have been used by a number of agencies and research laboratories and have shown significant potential for predicting the cracking behavior of the materials tested. The main objective of this project is to determine the viability of using three asphalt mixture test methods and one asphalt binder test method in the material selection process, quality control, and forensic investigations of asphalt paving materials. These test methods are: the Bending Beam Rheometer (BBR) for creep and strength of asphalt mixtures; low temperature SCB fracture testing for asphalt mixtures; E*testing of asphalt mixtures using the IDT configuration; and BBR strength testing of asphalt binders.