Meso-damage behavior of cement stabilized macadam for a long-time immersion based on particle flow theory

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-11-10 DOI:10.1680/jmacr.23.00012

Guofang Zhao, Chengcheng Luo, Xiaoyong Wu, Xinqiang Wang, Yongkang Yan, Zhanyou Yan

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Abstract

Water can cause a certain degree of damage to cement stabilized macadam. If cement stabilized macadam is immersed in water for a long time, the degree of damage will be greater. In order to study the damage of cement stabilized macadam with long-time water immersion, a discrete element model of cement stabilized macadam was established in this paper. The Weibull distribution function was used to simulate the heterogeneous contact between particles. The parallel bond model was to simulate the material constitutive relationship. The microscopic parameters of cement-stabilized macadam were obtained by trial-and-error method. The stress-strain curve was obtained by immersion test. The micromechanics behavior of cement stabilized macadam after immersion was analyzed. The results show that the contact area and strength of cement stabilized macadamia immersed for 30 days are 31.4 % and 46 % smaller than that of not immersed macadamia. The force chains between particles are evenly distributed. At the loading peak, the normal contact force between particles is much larger than the tangential force, and the vertical force chain is much larger than the transverse force chain. The distribution of cementation energy/friction energy/impact energy is not uniform in the middle/peak loading stage.

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基于颗粒流理论的水泥稳定碎石长时间浸没细观损伤行为

水会对水泥稳定碎石体造成一定程度的破坏。水泥稳定碎石如果长期浸泡在水中，其破坏程度会更大。为了研究水泥稳定碎石在长时间浸水作用下的损伤，建立了水泥稳定碎石的离散元模型。采用威布尔分布函数模拟颗粒间的非均匀接触。采用平行键模型模拟材料本构关系。采用试错法获得了水泥稳定碎石的微观参数。通过浸渍试验得到了应力-应变曲线。对水泥稳定碎石浸没后的细观力学行为进行了分析。结果表明，水泥稳定30 d的夏威夷果的接触面积和强度分别比未浸泡的夏威夷果小31.4%和46%。粒子间的力链分布均匀。在加载峰值处，颗粒间法向接触力远大于切向力，垂直力链远大于横向力链。在加载中峰阶段，胶结能/摩擦能/冲击能分布不均匀;

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.