Comparing Different HWTT Analysis Methods for Asphalt Mixes Containing RAP and Correlating with MIST-TSR

What is it about?

The use of recycled asphalt pavement (RAP) is gaining popularity is asphalt community. There is a general consensus that RAP leads to the improvement in rutting and moisture damage resistivity of asphalt mixes. Hamburg wheel tracking test (HWTT) is gaining popularity for ascertaining these distresses. However, there has been a rapid increase in the number of analysis methods for analysing the results of HWTT. Hence, this study compares these analysis methods for RAP mixes and recommends the methods that are based on sound techical foundations. At the same time, moisture induced stress tester (MIST) has been recently developed for quickly simulating moisture damage due to stripping on account of repeated pore pressure generations. Considering that both MIST and HWTT evaluate the moisture damage, a correlation between MIST-tensile strength ratio (TSR) and HWTT moisture damage parameters has also been performed.

Featured Image