SPR-787

Description:

A balanced mix design (BMD) approach to asphalt mixtures that considers both cracking and rutting resistance is important to minimize road-maintenance costs and extend the life of the pavement. Arizona Department of Transportation (ADOT) is currently engaged in a research project to assess innovative test methods to predict the cracking resistance of ADOT asphalt mixes across the state. The ADOT Materials Laboratory (Lab) obtained an apparatus known as the IDEAL-RT, which is used to conduct the shear rutting tests that predict the resistance to rutting (permanent deformation) of asphalt mixes. The Lab is interested in this test method to determine if it is acceptable for regular use in future rutting-resistance assessments of ADOT asphalt mixes. To refine its mix designs and improve resistance to cracking and rutting, the Lab needs valid, reliable methods to test and predict asphalt performance. Assessment results would inform the Lab in correlating the results of the IDEAL-RT with the traditional Hamburg Wheel Tester and the Asphalt Pavement Analyzer test methods. This project will focus on assessing the IDEAL-RT as a tool for predicting rutting resistance. 

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