期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 257, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.119476
关键词
Fatigue life; Residual strain; Residual strain ratio; Damage variable; Damage evolution; Fatigue equation
资金
- National Natural Science Funding of China [51308084]
- Special Subsidized Project of Basic Scientific Research Business Fees in Central Universities [3132017029]
- Natural Science Foundation Project of Liaoning [2018010659301]
This study aims to develop the fatigue life (N-f) prediction method of rubber asphalt mixture based on residual strain (RS) analysis by using three-point bending fatigue test. The RS mechanical model established based on the modified Burgers model was used to characterize the evolution laws of RS, the residual viscoelastic strain (RVES) and the residual viscous-flow strain (RVFS), and the mechanical parameter of residual strain ratio (RSR) was defined based on the evolution laws. The correlation analysis was performed to explore the relationship between the N-f and the RSR, and the damage indication was advanced. The damage variable was defined based on the RSR evolution and the established fatigue damage model based on the ExpAssoc damage evolution model was used to perform the damage evolution analysis. The correlation analysis between the RSR and the damage evolution speed (D-s) was conducted to establish the fatigue and remaining fatigue equations. The results showed that RS mainly consisted of RVES and RVFS, and the RVFS was primarily responsible for the material damage. The RS mechanical model can characterize the non-linear evolution laws of RS, RVES and RVFS with sufficient accuracy, and the RVES can be regarded as a constant under given conditions. The RSR characterizing D-s can determine damage evolution and Nf prediction, and define the damage variable by isolating the damage factor from the viscoelastic factor. The established damage model can be capable of capturing the damage evolution of the rubber asphalt mixture. The increased Ds led to the exhibited decrease in the N-f. The established fatigue equation and remaining fatigue equation succeeded in accurately predicting the N-f and remaining fatigue life (N-fr) corresponding to the early damage evolution stage of rubber asphalt mixture, respectively. (C) 2020 Published by Elsevier Ltd.
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