数值模拟骨料颗粒形状和级配对再生混凝土力学性能的影响  

A Numerical Simulation Study of the Effects of Aggregate Particle Shape andGradation on the Mechanical Properties of Recycled Concrete

作　　者：郭利霞 李松 钟凌 郭磊 汪伦焰 张芳芳 GUO Lixia;LI Song;ZHONG Ling;GUO Lei;WANG Lunyan;ZHANG Fangfang(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Henan Water Valley Research Institute,Zhengzhou 450046,China;Henan Key Laboratory of Water Environment Simulation and Treatment,Zhengzhou 450002,China)

机构地区：[1]华北水利水电大学水利学院,郑州450046 [2]河南水谷研究院,郑州450046 [3]河南省水环境模拟与治理重点实验室,郑州450002

出　　处：《材料导报》2022年第15期61-67,共7页Materials Reports

基　　金：国家重点研发计划基金项目(2018YFC0406803);水利部堤防安全与病害防治工程技术研究中心开放课题(2018008);华北水利水电大学研究生教育创新计划基金资助项目(YK2020-06)。

摘　　要：再生混凝土是一种复杂的多相复合材料,骨料是其主要组分,起骨架和支撑作用,对再生混凝土性能影响较大。本工作采用理论分析、试验和数值模拟手段,基于分形理论,建立考虑骨料级配和形状的特征模型,分析再生骨料特性,并在此基础上设计不同骨料特征的单轴压缩模拟试验,模拟再生混凝土的破坏过程,结果表明:(1)随着再生粗骨料级配越接近最大密实度曲线,其级配的分形维数越大,再生混凝土的峰值应力和弹性模量也随之增大;(2)骨料颗粒形状越规则圆滑,其骨料形状特征值越小,再生混凝土的峰值应力和弹性模量越大;(3)再生混凝土骨料级配设计过程中,需使得骨料级配密实,并对简单破碎的再生混凝土骨料全部进行整形处理。上述研究可为再生骨料的资源化利用和工程设计提供理论依据。Recycled concrete is a multiphase composite material.As its main component,the aggregate serves as skeleton and support and has a profound impact on its performance.This work conducted theoretical analysis,experiments and numerical simulations to establish a characteristic model that considers aggregate gradation and shape based on fractal theory.The developed model was used to analyze the characteristics of recycled aggregates.On this basis,a uniaxial compression simulation experiment with different aggregate characteristics was designed to simulate the failure process in recycled concrete.Results show:(i)as the gradation of recycled coarse aggregates approaches the maximum-density curve,the gradation fractal dimension increases,as do the peak stress and elastic modulus accordingly;(ii)the smoother and more regular the aggregate particles,the smaller the aggregate shape eigenvalues and the larger the peak stress and elastic modulus;(iii)in designing the mix proportions,a dense aggregate gradation should be used and all simply crushed recycled concrete aggregates should be reshaped.The above results provide a theoretical basis for renewable aggregate recycling and engineering design.

关 键 词：再生混凝土 颗粒整形 分形理论 力学性能 

分 类 号：TV43[水利工程—水工结构工程]