Crack and crack growth behavior analysis of asphalt mixtures based on the digital speckle correlation method
Crack and crack growth behavior analysis of asphalt mixtures based on the digital speckle correlation method
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基于数字散斑相关法的沥青混合料裂纹及裂纹扩展行为分析
DOI：
10.1016/j.conbuildmat.2017.04.130
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发表时间：
2017-08-30
影响因子：
7.4
通讯作者：
Wang Xiao-xiao
中科院分区：
文献类型：
--
作者：
Li Chao;Wang Lan;Wang Xiao-xiao
裂缝是沥青路面损坏的主要原因之一。由于沥青混合料的各向异性，传统的试验方法不能准确分析位移场和应变场。数字散斑相关法是一种全场、非接触的测量技术，是分析沥青混合料变形特性的良好方法。利用数字散斑相关技术（DSCM）和半圆弯曲（SCB）试验，可以对裂纹的萌生和扩展规律进行实验测试;利用维克-3D软件可以对全场位移和应变进行分析。结果表明，应变场（Exx）和位移变化率场（dU/dt）适合于研究沥青混合料的裂缝特性和断裂特性。沥青结合料与石料之间的界面是整个结构中最薄弱的部分，通过对比橡胶粉（CR）改性沥青混合料和丁苯橡胶（SBS）改性沥青混合料的裂缝扩展速率和荷载位移曲线，发现CR改性沥青混合料的承载能力比SBS改性沥青混合料的承载能力强。(C)2017爱思唯尔有限公司版权所有
Cracking is one of the main reasons for asphalt pavement damage. Because of the anisotropism of asphalt mixtures, traditional experimental methods cannot analyze displacement and strain fields accurately. A full-field, noncontact measurement technology the digital speckle correlation method (DSCM) is a good method to analyze the deformation characteristics of asphalt mixtures. By using DSCM and a semi-circular bending (SCB) test, the crack initiation and propagation rules can be tested experimentally; the full-field displacement and strain can be analyzed by vic-3D software. The results show that the strain field (Exx) and the rate of change displacement field (dU/dt) are well suited to study the properties of crack and fracture characteristics of asphalt mixtures. The interface between asphalt binder and stone is the weakest part of the entire structure, and comparing the crack growth rate and load displacement curve of a crumb-rubber (CR) modified asphalt mixtures and a styrene-butadienestyrene (SBS) modified asphalt mixtures, it is found that the carrying capacity of a CR modified asphalt mixtures is stronger than that of a SBS modified asphalt mixtures. (C) 2017 Elsevier Ltd. All rights reserved.