Evaluation of fatigue crack behavior in asphalt concrete pavements with different polymer modifiers
Evaluation of fatigue crack behavior in asphalt concrete pavements with different polymer modifiers
复制标题
DOI：
10.1016/j.conbuildmat.2011.08.017
复制
发表时间：
2012-02
影响因子：
7.4
通讯作者：
Suo Zhi;Wong Wing Gun;L. Hui;Tian Bo
中科院分区：
文献类型：
--
作者：
Suo Zhi;Wong Wing Gun;L. Hui;Tian Bo
疲劳裂缝是沥青混凝土路面结构破坏的主要形式之一。沥青混凝土路面材料在反复荷载作用下，由于宏观和微观裂纹的累积和扩展，逐渐发生劣化。现有的沥青混凝土路面预测模型通常没有考虑微观和宏观力学之间的相互作用和依赖关系。在本研究中，疲劳损伤模型和失效准则的基础上进行的间接拉伸疲劳试验（ITFT）和间接拉伸刚度模量（ITSM）测试AC材料与不同种类的聚合物改性剂。这些添加剂是聚丙烯（PP）、废橡胶（CR）、纤维素纤维（CF）、石棉纤维（AF）和Gilsonite（GS）。基于连续损伤力学的疲劳损伤模型描述了磨耗层材料（ACWC和SMA）中微裂纹的形成和扩展。采用疲劳损伤模型，对柔性路面结构磨耗层材料的抗裂性能进行了有限元分析。
Fatigue crack has been recognized as one of the main forms for structural damage in asphalt concrete pavements. Under the action of repeated vehicular loading, deterioration of the asphalt concrete (AC) materials in pavements, caused by the accumulation and growth of micro and macro cracks, gradually takes place. Existing prediction models in asphalt concrete pavement typically do not take the interaction and dependencies between micro and macro mechanics into account. In this research, the fatigue damage models and failure criteria are established based on the Indirect Tensile Fatigue Tests (ITFT) and Indirect Tensile Stiffness Modulus (ITSM) tests carried out on AC materials with different kinds of polymer modifiers. These additives are Polypropylene (PP), Crumb rubber (CR), Cellulose fiber (CF), Asbestos fiber (AF) and Gilsonite (GS). Fatigue damage model, based on continuum damage mechanics, describes the formation of micro-cracks and crack propagation developed in the wearing course materials (ACWC and SMA). With the fatigue damage models, finite element analysis is carried out to study the crack resisting performance of the wearing course materials in a flexible pavement structure.