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Crack and crack growth behavior analysis of asphalt mixtures based on the digital speckle correlation method

机译：基于数字散斑相关法的沥青混合料裂缝及裂缝扩展行为分析

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摘要

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.
机译：破裂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，传统的实验方法无法准确地分析位移和应变场。数字散斑相关法（DSCM）是一种全场非接触式测量技术，是分析沥青混合料变形特性的好方法。通过使用DSCM和半圆形弯曲（SCB）测试，可以通过实验测试裂纹的萌生和扩展规则。全场位移和应变可以通过vic-3D软件进行分析。结果表明，应变场（Exx）和变化率位移场（dU / dt）非常适合研究沥青混合料的裂缝和断裂特性。沥青粘合剂与石材之间的界面是整个结构中最薄弱的部分，并比较了碎橡胶（CR）改性沥青混合物和苯乙烯-丁二烯（SBS）改性沥青混合物的裂纹扩展速率和载荷位移曲线，据发现，CR改性沥青混合物的承载能力强于SBS改性沥青混合物的承载能力。 （C）2017 Elsevier Ltd.保留所有权利。

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