Development of an Experimental Method for Asphalt Concrete Overlay Reflective Cracking Evaluation

Gui-Lian Zou ； Chung Wu ； Jian Xu

《International Journal of Pavement Research and Technology》 6卷4期 (2013/07) Pp. 327-335

https://doi.org/10.6135/ijprt.org.tw/2013.6(4).327

並列摘要

From a concept normally used in metallic material science, the parameter ”Impact Toughness” was used in this study to evaluate the ability of various asphalt mixtures to resist reflective cracking in composite pavements. In this paper, Impact Toughness was defined as the area underneath the load-displacement curve of three point bending specimen subjected to impact loading. From fracture mechanics and energy principal, it was proved that the Impact Toughness of an asphalt mixture can be correlated to its ability of resisting reflective cracking; the higher the Impact Toughness value, the stronger the material. Further, the optimum testing temperature was determined to be 15°C, established from stress-temperature curves of six asphalt mixtures. The laboratory testing results indicated that the aggregate gradation and the asphalt binder type were major factors that influenced the mixtures' Impact Toughness. Dense graded asphalt mixtures had higher Impact Toughness value than gap graded and modified asphalt mixtures had higher value than unmodified ones. The maximum size of the aggregate used in the mixtures affected their Impact Toughness as well. To validate the test results, a pavement model consisting of an asphalt concrete overlay on top of a Portland cement concrete pavement joint was constructed and subjected to repeated loading of an Asphalt Pavement Analyzer (APA). The number of loading required for the crack to appear on the asphalt overlay surface was termed as the fatigue life. The results showed that there was an excellent linear relationship between the fatigue life of the pavement model and the Impact Toughness. Therefore, it is evident that the Impact Toughness of asphalt mixtures can represent the ability of the mixtures to resist reflective cracking and can provide guidance for asphalt mixture selection and design.

並列關鍵字

Experimental method ； Impact Toughness ； Reflective cracking

參考文獻

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