Characterization of Fatigue Damage of Hot Mix Asphalt Based on Residual Strength

This study carried out laboratory investigations of fatigue damage development of hot mix asphalt (HMA) by semicircular bending (SCB) test. Strength of the HMA specimen was first investigated at different loading rates, the results of which indicate an exponential relationship between strength and loading rate. The SCB fatigue test at stress-control mode was then performed at six levels of stress-strength ratio (SSR). Two fatigue life prediction models have been established accordingly based on the concepts of the nominal SSR and the authentic SSR. The latter model can better predict fatigue behaviors. As follows, another round of SCB fatigue test was continued to investigate the relationship between residual strength and fatigue damage evolution. Analysis of test results indicate that fatigue damage evolution is nonlinear and consists of two components: the accumulative damage development and last-cycle damage jump. A fatigue damage evolution model has been finally built based on the residual strength, which can capture the “sudden death” phenomenon of the fatigue damage process at stress-control mode.

Language

  • English

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Filing Info

  • Accession Number: 01633169
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Apr 7 2017 3:01PM