Mesoscale fracture simulation of recycled aggregate concrete under uniaxial compression based on cohesive zone model

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-06-07 DOI:10.1016/j.dibe.2024.100481

Chunqi Zhu , Eryu Zhu , Bin Wang , Zhu Zhang , Mingyang Li

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引用次数: 0

Abstract

It is important to clarify the uniaxial compressive mechanical properties and fracture mechanism of recycled aggregate concrete (RAC) from a mesoscale perspective for its further application in engineering. In this study, the cohesive zone model (CZM) based on the Benzeggagh–Kenane (B–K) criterion was used to simulate the RAC's complex fracture behavior. Meanwhile, the effects of cohesive element parameters and mechanical properties of mesoscale components on macroscopic mechanical properties and damage modes of RAC were investigated. The results show that the CZM based on the B–K criterion can be used to characterize the whole fracture process of RAC. The RAC's compressive strength has an exponential relationship with the shear strengths of the mortars as well as the ITZs and is quadratically related to the logarithm of cohesive element stiffness. The RAC's damage morphology is more sensitive to the change of element stiffness, Mode II fracture energy and hybrid fracture energy ratio.

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基于粘聚区模型的单轴压缩条件下再生骨料混凝土的中尺度断裂模拟

从中尺度角度阐明再生骨料混凝土（RAC）的单轴抗压力学性能和断裂机理对其在工程中的进一步应用非常重要。本研究采用基于 Benzeggagh-Kenane （B-K）准则的内聚区模型（CZM）来模拟 RAC 的复杂断裂行为。同时，研究了内聚元素参数和中尺度部件的力学性能对 RAC 宏观力学性能和损伤模式的影响。结果表明，基于 B-K 准则的 CZM 可用于表征 RAC 的整个断裂过程。RAC 的抗压强度与砂浆和 ITZ 的抗剪强度呈指数关系，与内聚元素刚度的对数呈二次关系。RAC 的破坏形态对元素刚度、模式 II 断裂能和混合断裂能比率的变化更为敏感。

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

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.