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集料强度对环氧沥青混合料弯曲开裂行为影响的试验评估

Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures.

作者信息

Xu Wei, Wei Xiaoshu, Wei Jintao, Chen Zhengxiong

机构信息

School of Civil Engineering and Transportation, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510641, China.

出版信息

Materials (Basel). 2020 Apr 16;13(8):1876. doi: 10.3390/ma13081876.

DOI:10.3390/ma13081876
PMID:32316299
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7215811/
Abstract

The flexural cracking resistance of an asphalt concrete mixture used in a steel bridge deck pavement needs to be higher than that of one used in ordinary pavement. In this study, mechanical experimental tests were used to evaluate the influence of the aggregate strength on the flexural cracking behavior of epoxy asphalt concrete (EAC). The aggregate fracture area of beam cross sections was quantitatively analyzed by digital image processing, and crack propagation in the mixture was analyzed using fracture mechanics theory. The bending test results showed that the EAC containing high-strength aggregates exhibited the highest flexural cracking resistance among all of the aggregate mixtures under the same conditions. The use of high-strength aggregates led to a reduction in the aggregate fracture area, thereby improving the flexural cracking resistance of the mixture. The aggregate strength had a significant influence on the flexural cracking propagation behavior of the mixture. Fatigue test results at strain-controlled levels of 600-1200 με and 15 °C showed that the aggregate strength had no evident influence on the fatigue properties of the EAC. It is recommended that high-strength aggregates are used to increase the fracture resistance of aggregates and the flexural crack resistance of EACs.

摘要

钢桥桥面铺装中使用的沥青混凝土混合料的抗弯曲开裂性能需要高于普通路面中使用的混合料。在本研究中，采用力学试验来评估集料强度对环氧沥青混凝土（EAC）弯曲开裂行为的影响。通过数字图像处理对梁截面的集料断裂面积进行了定量分析，并使用断裂力学理论分析了混合料中的裂缝扩展情况。弯曲试验结果表明，在相同条件下，含有高强度集料的EAC在所有集料混合料中表现出最高的抗弯曲开裂性能。使用高强度集料导致集料断裂面积减小，从而提高了混合料的抗弯曲开裂性能。集料强度对混合料的弯曲开裂扩展行为有显著影响。在600 - 1200 με应变控制水平和15°C下的疲劳试验结果表明，集料强度对EAC的疲劳性能没有明显影响。建议使用高强度集料来提高集料的抗断裂性能和EAC的抗弯曲开裂性能。

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引用本文的文献

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