Effect of Aggregate Characteristics and Distribution on the Mechanical Characteristics of Recycled Concrete

IF 2.9 4区 综合性期刊 Q1 Multidisciplinary Arabian Journal for Science and Engineering Pub Date : 2024-08-11 DOI:10.1007/s13369-024-09395-7
Lixia Guo, Yuqing Yang, Ling Zhong, Jianwei Zhang
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Abstract

Recycled concrete is a green material composed of natural aggregate and recycled aggregate mixed with cementing material and water in a certain ratio. The random distribution of aggregate in concrete has a great impact on material properties due to its supporting effect. In order to explore the characteristics of aggregate and the influence of its random distribution on the compressive strength performance of recycled aggregate concrete, numerical simulation is adopted in this paper. By using RAND function in ANSYS software APDL, a five-phase random aggregate model of recycled aggregate concrete was generated based on Monte Carlo method, and numerical simulation of uniaxial compression mechanical properties of concrete specimens under different recycled aggregate substitution rates (0%, 35% and 100%) was carried out. On the basis of reliability of the numerical simulation method verified by laboratory tests, multiple groups of stress–strain characteristic curves were obtained, the failure characteristics and stress characteristics of recycled concrete were analyzed, and Weibull probability statistical distribution was introduced to characterize the randomness and heterogeneity of mechanical characteristic parameters of recycled aggregate concrete. The results show that the compressive strength of recycled aggregate concrete is subject to Weibull distribution under random distribution of aggregate, and the shape coefficient m in Weibull distribution parameter can characterize the randomness and complexity of the failure of recycled concrete. The dispersion of the compressive strength of recycled aggregate concrete shows a decreasing trend with the increase in the substitution rate of recycled aggregate.

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骨料特性和分布对再生混凝土机械特性的影响
再生混凝土是由天然骨料和再生骨料与胶结材料和水按一定比例混合而成的绿色材料。骨料在混凝土中的随机分布具有支撑作用,对材料性能有很大影响。为了探讨骨料的特性及其随机分布对再生骨料混凝土抗压强度性能的影响,本文采用了数值模拟的方法。利用 ANSYS 软件 APDL 中的 RAND 函数,基于 Monte Carlo 方法生成了再生骨料混凝土的五相随机骨料模型,并对不同再生骨料取代率(0%、35% 和 100%)下混凝土试件的单轴压缩力学性能进行了数值模拟。在实验室试验验证数值模拟方法可靠性的基础上,得到了多组应力-应变特性曲线,分析了再生混凝土的破坏特性和应力特性,并引入 Weibull 概率统计分布表征了再生骨料混凝土力学特性参数的随机性和异质性。结果表明,在骨料随机分布的情况下,再生骨料混凝土的抗压强度服从威布尔分布,威布尔分布参数中的形状系数 m 可以表征再生混凝土破坏的随机性和复杂性。随着再生骨料替代率的增加,再生骨料混凝土抗压强度的离散性呈下降趋势。
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来源期刊
Arabian Journal for Science and Engineering
Arabian Journal for Science and Engineering 综合性期刊-综合性期刊
CiteScore
5.20
自引率
3.40%
发文量
0
审稿时长
4.3 months
期刊介绍: King Fahd University of Petroleum & Minerals (KFUPM) partnered with Springer to publish the Arabian Journal for Science and Engineering (AJSE). AJSE, which has been published by KFUPM since 1975, is a recognized national, regional and international journal that provides a great opportunity for the dissemination of research advances from the Kingdom of Saudi Arabia, MENA and the world.
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