- 期刊
Asphalt Mixtures' Crack Propagation Assessment Using Semi-Circular Bending Tests
並列摘要
The main objective of this study was to evaluate asphalt mixtures for their crack propagation potential using the semi-circular bending (SCB) test. The work encompassed two major tasks: first, preparing two laboratory blended asphalt mixes and obtaining relevant fracture characteristics of those mixtures using the SCB tests; and second, implementing the laboratory test methodology in studying the actual field test sections for their crack propagation potential by utilizing SCB tests on the procured field-cored samples. For the laboratory-prepared mixes, the mix with higher binder content provided better resistance to crack propagation in terms of fracture energy. For the field-cored samples, the mix with an additional binder provided significantly higher resistance to fatigue cracking and propagation. The modified mix (with an additional binder percentage) and the reference mix had significantly different fracture energy characteristics. At all test temperatures, the modified mix was 50% higher in magnitude than the reference mix. This was also confirmed from the previously conducted routine fatigue cracking tests. Overall, the SCB tests and analytical methodologies provided insight in understanding the comprehensive picture of the fatigue criteria and in the prediction of the design service lives of the two different road base layers essential for pavement design. It is envisioned that the procedure developed in this study can be useful for a comprehensive fatigue evaluation of the asphalt mixtures and aid in their pavement design methodology in forecasting the residual life of the flexible pavement.
延伸閱讀
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