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Investigation of Crack Initiation Behavior of Asphalt Mixtures: Fatigue through Dynamic Semicircular Bending Test

机译:沥青混合料开裂行为的研究:疲劳的动态半圆弯曲试验

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The objective of this study was to investigate the crack initiation behavior of asphalt mixtures and examine the fracture mechanism using dynamic semicircular bending (SCB) test. The scope of the study encompassed estimation of crack initiation parameter (N-i) and fatigue failure of six asphalt mixtures, including, conventional dense-graded (D) and rubber-modified gap-graded (AR) mixtures covering 144 SCB specimens. At 5 degrees C, 15 degrees C, and 25 degrees C, D-mixes produced higher N-i than AR mixtures attributed to higher stiffness of D-mixes. Relative share analysis of N-i was found to be higher for D-mix than AR mixtures. Furthermore, correlation between vertical bar E*vertical bar and N-i indicated that higher stiffness of the mix resulted in brittle failure, which in turn increased the time for crack initiation to occur. Importantly, the stiffness of asphalt mixtures played a deciding role in contributing to the crack initiation phenomenon of these materials. Overall, the dynamic SCB test developed as part of the study was found to be a promising assessment technique to characterize crack initiation behavior of different types of asphalt mixtures.
机译:这项研究的目的是研究沥青混合料的裂纹萌生行为,并使用动态半圆弯曲(SCB)试验检查断裂机理。研究范围包括估计六种沥青混合料的裂纹起始参数(N-i)和疲劳破坏,包括覆盖144个SCB标本的常规致密等级(D)和橡胶改性的间隙等级(AR)混合物。在5摄氏度,15摄氏度和25摄氏度,D混合物比AR混合物产生更高的N-i,这归因于D混合物的刚度更高。发现D-mix的N-i相对份额分析高于AR混合物。此外,竖线E *竖线与N-i之间的相关性表明,混合物的较高刚度会导致脆性破坏,从而增加了裂纹萌生的时间。重要的是,沥青混合物的刚度在促成这些材料的裂纹萌生现象中起着决定性的作用。总体而言,作为研究的一部分而开发的动态SCB测试被认为是一种有前途的评估技术,可以表征不同类型的沥青混合物的裂纹萌生行为。

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