Inicio  /  Applied Sciences  /  Vol: 7 Núm: 3 Par: March (2017)  /  Artículo
ARTÍCULO
TITULO

Fatigue Life Prediction of High Modulus Asphalt Concrete Based on the Local Stress-Strain Method

Mulian Zheng    
Peng Li    
Jiangang Yang    
Hongyin Li    
Yangyang Qiu and Zhengliang Zhang    

Resumen

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.

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