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Journal of Engineering
Volume 2016, Article ID 8359103, 7 pages
http://dx.doi.org/10.1155/2016/8359103
Research Article

Survival Analysis of Fatigue and Rutting Failures in Asphalt Pavements

Civil Engineering Department, National Institute of Technology, Silchar, Silchar, Assam 788010, India

Received 3 February 2016; Accepted 14 April 2016

Academic Editor: İlker Bekir Topçu

Copyright © 2016 Pabitra Rajbongshi and Sonika Thongram. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fatigue and rutting are two primary failure mechanisms in asphalt pavements. The evaluations of fatigue and rutting performances are significantly uncertain due to large uncertainties involved with the traffic and pavement life parameters. Therefore, deterministically it is inadequate to predict when an in-service pavement would fail. Thus, the deterministic failure time which is known as design life () of pavement becomes random in nature. Reliability analysis of such time () dependent random variable is the survival analysis of the structure. This paper presents the survival analysis of fatigue and rutting failures in asphalt pavement structures. It is observed that the survival of pavements with time can be obtained using the bathtub concept that contains a constant failure rate period and an increasing failure rate period. The survival function (), probability density function (pdf), and probability distribution function (PDF) of failure time parameter are derived using bathtub analysis. It is seen that the distribution of failure time follows three parametric Weibull distributions. This paper also works out to find the most reliable life () of pavement sections corresponding to any reliability level of survivability.