Investigation of effectiveness of prediction of fatigue life for hot mix asphalt blended with recycled concrete aggregate using monotonic fracture testing

The fatigue property of asphalt mixtures is important for the purpose of pavement engineering design; however, assessing fatigue life using cyclic tests in the laboratory is time-consuming and tedious. This study investigates the potential of using monotonic fracture testing to predict the fatigue life of asphalt mixtures. Both monotonic tests and cyclic tests were conducted using hot mix asphalt (HMA) blended with recycled concrete aggregate (RCA) at different ratios (0%, 20%, 40%, 60%, 80% and 100%). The predicted fatigue life obtained from monotonic testing are found to be much lower than the fatigue life obtained from cyclic testing, which could be due to the hysteresis loss and healing effect in the cyclic testing. It is also found that the fatigue resistance of HMA is adversely affected by the use of RCA.