Study on Fatigue Life of Cement Stabilized Macadam Base during Crack Expanding Phase Based on Accelerated Loading Test

摘要

The evaluation for remaining life of semi-rigid base layer has a significant effect on pavement maintenance scheduling like resurface or rehabilitation. An accurate evaluation can obviously improve the pavement maintenance, which could also utilize the original pavement structure in a rationally way, and optimize the entire maintenance plan. In this study, a series of laboratory investigation were conducted on the cement stabilized macadam materials. The fatigue life and deterioration characteristics of cement stabilized macadam materials were analyzed during the pre-cracked (fatigue cracks occurring) phase and crack expanding phase by laboratory fatigue test and full-scale accelerated loading test, respectively. Then, a fatigue life correction coefficient of the crack expanding phase was used to analyze the fatigue properties of the semi-rigid base, and a modulus degradation model of the semi-rigid base life was characterized. It proved to be convenient to evaluate the residual life of semi-rigid base according to the modulus.