非规则再生骨料建模及再生骨料混凝土数值模拟  

Modeling of Irregular Recycled Aggregates and Numerical Simulation of Recycled Aggregate Concrete

作　　者：胡焱博 高鹏[1,2,3,4] 李景哲[1] 章国辉 王国陶 董帅志 储玉婷 詹炳根 余其俊 HU Yanbo;GAO Peng;LI Jingzhe;ZHANG Guohui;WANG Guotao;DONG Shuaizhi;CHU Yuting;ZHAN Binggen;YU Qijun(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Cement Based Materials Low Carbon Technology and Equipment Engineering Research Center of the Ministry of Education,Hefei 230009,China;Anhui Province Cement Based Materials Low Carbon Technology Engineering Research Center,Hefei 230009,China;Anhui Key Laboratory of Civil Engineering Structures and Materials,Hefei 230009,China;China Railway No.4 Engineering Group Co.,Ltd.,Hefei 230022,China;Hainan Yangtong New Materials Co.,Ltd.,Danzhou 578101,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]水泥基材料低碳技术与装备教育部工程研究中心,合肥230009 [3]安徽省水泥基材料低碳技术工程研究中心,合肥230009 [4]土木工程结构与材料安徽省重点实验室,合肥230009 [5]中铁四局集团有限公司,合肥230022 [6]海南洋砼新材料有限公司,儋州578101

出　　处：《硅酸盐通报》2024年第1期276-286,294,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家“十三五”重点研发计划(2020YFC1909902);国家自然科学基金青年科学基金(52002129);中央高校基本科研业务费专项资金资助(JZ2023HGTB0256,PA2023GDSK0069)。

摘　　要：传统再生骨料混凝土(RAC)模型多采用基本几何形状来代表再生骨料(RA)结构,这与实际情况差异较大。本文结合数字图像技术和傅里叶描述法构建了真实的二维骨料数据库,并提出了基于骨料叠加法随机生成RA的新方法。基于外接矩形框/内切圆的粗判定和基于重叠框的精细判定提出了一种新的适用于傅里叶重构骨料的快速投放算法,实现了不同RA取代率和RA残余砂浆含量的RAC细观结构的构建。基于内聚力模型根据随机生成的RAC的细观结构建立了数值模型,研究了RA取代率和RA残余砂浆含量对RAC单轴抗拉性能的影响。结果表明,RAC的抗拉强度和弹性模量随着RA取代率和RA残余砂浆含量的增加而降低,但峰值应变变化不大。该RA模型更符合实际,且附着砂浆的含量和分布可自主调整。Traditional recycled aggregate concrete(RAC)models mostly use basic geometries to represent recycled aggregate(RA)structures,which is quite different from the actual situation.In this paper,a real two-dimensional aggregate database was constructed by combining digital image technology and Fourier descriptor method,and a new method for random generation of RA based on aggregate overlap method was proposed.A new rapid placement algorithm suitable for Fourier reconstituted aggregate was proposed based on the coarse determination of the outer rectangular box/inscribed circle and the fine determination based on the overlap box.And the construction of RAC meso-structure with different RA substitution rates and RA residual mortar content was realized.Based on the cohesive zone model,a numerical model was established based on the meso-structure of randomly generated RAC,and the effects of RA substitution rate and RA residual mortar content on the uniaxial tensile performance of RAC were studied.The results show that the tensile strength and elastic modulus of RAC decrease with the increase of RA substitution rate and RA residual mortar content,but the peak strain does not change much.The RA model is more realistic,and the content and distribution of adhesion mortar can be adjusted independently.

关 键 词：傅里叶重构 再生骨料 再生骨料混凝土 细观结构 骨料投放算法 内聚力模型 

分 类 号：TU528.09[建筑科学—建筑技术科学]