Numerical simulation study on fracture behavior of asphalt concrete under temperature segregation effect

IF 8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Xu Chen , Dongya Ren , Changfa Ai , Yuan Cao , Chuanqi Yan , Mengying Tang
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引用次数: 0

Abstract

Existing studies on the influence of temperature segregation on the fracture behavior of asphalt pavement in cold regions are mostly based on conventional macroscopic tests, lacking research on the meso-mechanical behavior of internal particles in asphalt concrete. In view of this, this paper, based on the gradation and void ratio of standard Marshall specimens, employs the discrete element numerical simulation method to analyze the influence of temperature segregation on the meso-fracture behavior of asphalt concrete, including interparticle contact forces, displacement, and crack propagation. It is found that temperature segregation alters the mechanical behavior of asphalt concrete by restructuring its meso-spatial configuration. The main conclusions are as follows: temperature segregation reorganizes the spatial structure of meso-particles (aggregates and asphalt mortar) in asphalt concrete, thereby inducing a redistribution of interfacial contact forces among particles. This subsequently leads to coordinated changes in particle displacement and ultimately alters the crack distribution pattern. This cascading mechanical response deteriorates the low-temperature crack resistance of asphalt concrete.
温度离析作用下沥青混凝土断裂行为的数值模拟研究
现有的温度偏析对寒冷地区沥青路面断裂行为影响的研究大多基于常规的宏观试验,缺乏对沥青混凝土内部颗粒细观力学行为的研究。鉴于此,本文基于标准马歇尔试件的级配和孔隙率,采用离散元数值模拟方法,分析温度偏析对沥青混凝土细观断裂行为的影响,包括颗粒间接触力、位移和裂缝扩展。研究发现,温度偏析通过重塑沥青混凝土的细观空间结构来改变沥青混凝土的力学行为。主要结论如下:温度偏析使沥青混凝土中细观颗粒(骨料和沥青砂浆)的空间结构重新组织,从而引起颗粒间界面接触力的重新分布。这随后导致颗粒位移的协调变化,最终改变裂纹分布模式。这种级联力学响应使沥青混凝土的低温抗裂性能恶化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
期刊介绍: Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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