Evaluation of Influence Factors to Crack Initiation of LTPP Resurfaced Asphalt Pavements Using Parametric Survival Analysis

Survival model with Weibull hazard function was employed to evaluate the influence of different factors on the crack initiation of resurfaced asphalt pavement. Data from SPS-5 experiments of Long Term Pavement Performance (LTPP) program were used to conduct the analysis. The initiation time of four types of cracks including the alligator (fatigue) crack, longitudinal crack on wheel path, non-wheel path longitudinal crack and transverse crack were evaluated. Analyzed factors include overlay thickness, traffic volume, freeze index, mixture (using RAP or virgin) and mill (or no mill) before overlay. It was found that traffic level was a significant factor for all of the four types of cracks. High traffic level accelerated the initiation of cracking. Thick overlay delayed the initiation of cracking except for the non-wheel path longitudinal crack, which is mainly caused by poor construction. Severe freeze thaw conduction accelerated the occurrence of the non-wheel path longitudinal and transverse cracks; whereas, mill before overlay significantly retarded the occurrence of the two types of cracking. Incorporating 30% recycled asphalt material in the overlay accelerated the initiation of longitudinal crack on wheel path, but did not influence the initiation of other three types of cracking.

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