Abstract
Previously published studies have proposed fatigue life prediction models for dense graded asphalt pavement based on flexural fatigue test. This study focused on the fatigue life prediction of High Modulus Asphalt Concrete (HMAC) pavement using the local strain-stress method and direct tension fatigue test. First, the direct tension fatigue test at various strain levels was conducted on HMAC prism samples cut from plate specimens. Afterwards, their true stress-strain loop curves were obtained and modified to develop the strain-fatigue life equation. Then the nominal strain of HMAC course determined using finite element method was converted into local strain using the Neuber method. Finally, based on the established fatigue equation and converted local strain, a method to predict the pavement fatigue crack initiation life was proposed and the fatigue life of a typical HMAC overlay pavement which runs a risk of bottom-up cracking was predicted and validated. Results show that the proposed method was able to produce satisfactory crack initiation life.
Highlights
Fatigue damage refers to the accumulation of damage in asphalt concrete, causing cracks and fracture extensions, and resulting in loading failure
In order to be widely applied in the design and development of High Modulus Asphalt Concrete (HMAC) [29,30], the Neuber equation is modified by replacing the theoretical stress concentration factor
This study provides an experimental investigation into the fatigue performance of high modulus asphalt concretes, including the cyclic σ − ε test and direct tensile fatigue test
Summary
Fatigue damage refers to the accumulation of damage in asphalt concrete, causing cracks and fracture extensions, and resulting in loading failure. One of the major achievements of the SHRP asphalt mix research projects is the development of a fatigue life prediction model based on the results of intensive bending beam fatigue tests. We conduct direct tensile fatigue tests and cyclic stress-strain tests at different strain levels to determine the fatigue properties of HMAC, and propose a method to predict the fatigue crack initiation life of HMAC. This method is based on a modified Neuber equation and the local stress-strain method
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