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不同再生混凝土骨料（RCA）含量的砂-RCA混合物直接剪切行为的试验与数值研究

Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA.

作者信息

Liu Yiming, Huang Shiqiang, Li Lihua, Xiao Henglin, Chen Zhi, Mao Haijun

机构信息

School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.

Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.

出版信息

Materials (Basel). 2021 May 28;14(11):2909. doi: 10.3390/ma14112909.

DOI:10.3390/ma14112909
PMID:34071474
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8198910/
Abstract

Recycled concrete aggregate (RCA) is a typical construction and demolition (C&D) material generated in civil engineering activities and has been widely used as the coarse-grained filler added to sand for roadbed fillings. The effect of RCA content on the mechanical behavior of sand-RCA mixtures is complicated and still not fully understood. To explore the effect of RCA content on the macroscale and microscopic behavior of the sand-RCA mixtures with various RCA contents, laboratory direct shear tests and numerical simulations using the 3D discrete element method were performed. Experimental direct shear tests on sand-RCA mixtures with different contents of RCA were first carried out. Numerical direct shear models were then established to represent the experimental results. The particle shape effect was also considered using a new realistic shape modeling method to model the RCA particles. Good agreement was observed between the DEM simulation and experimental results, verifying the ability of the numerical direct shear models to represent the direct shear behavior of sand-RCA mixtures. The macroscopic responses of both experimental and numerical tests showed that all samples presented an initial hardening followed by a post-peak strain softening. The peak-state friction angles increased with the RCA content for samples under the same vertical stress. The effect of RCA content on the microscopic behavior based on DEM simulation was also found. The microscopic properties of RCA-sand mixtures, such as coordination numbers, PDFs and contact force transformation features, were analyzed and related to the macroscopic results.

摘要

再生混凝土骨料（RCA）是土木工程活动中产生的一种典型的建筑废弃物，已被广泛用作添加到砂中的粗粒填料用于路基填筑。RCA含量对砂-RCA混合物力学性能的影响较为复杂，目前仍未完全明晰。为探究不同RCA含量对砂-RCA混合物宏观和微观行为的影响，开展了室内直剪试验以及采用三维离散元法的数值模拟。首先对不同RCA含量的砂-RCA混合物进行了直剪试验。随后建立了数值直剪模型以表征试验结果。还采用一种新的真实形状建模方法考虑了颗粒形状效应来模拟RCA颗粒。离散元模拟结果与试验结果吻合良好，验证了数值直剪模型表征砂-RCA混合物直剪行为的能力。试验和数值试验的宏观响应均表明，所有试样均呈现出初始硬化，随后是峰值后应变软化。在相同竖向应力下，试样的峰值状态摩擦角随RCA含量的增加而增大。基于离散元模拟还发现了RCA含量对微观行为的影响。分析了RCA-砂混合物的微观特性，如配位数、概率密度函数和接触力转换特征，并将其与宏观结果相关联。

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本文引用的文献

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Waste Manag. 2016 Mar;49:131-145. doi: 10.1016/j.wasman.2015.12.021. Epub 2015 Dec 31.