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非规则再生骨料建模及再生骨料混凝土数值模拟

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
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.
Modeling of Irregular Recycled Aggregates and Numerical Simulation of Recycled Aggregate Concrete
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.

Fourier reconstructionrecycled aggregaterecycled aggregate concretemeso-structureaggregate placement algorithmcohesive zone model

胡焱博、高鹏、李景哲、章国辉、王国陶、董帅志、储玉婷、詹炳根、余其俊

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合肥工业大学土木与水利工程学院,合肥 230009

水泥基材料低碳技术与装备教育部工程研究中心,合肥 230009

安徽省水泥基材料低碳技术工程研究中心,合肥 230009

土木工程结构与材料安徽省重点实验室,合肥 230009

中铁四局集团有限公司,合肥 230022

海南洋砼新材料有限公司,儋州 578101

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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

国家"十三五"重点研发计划国家自然科学基金青年科学基金中央高校基本科研业务费专项资金资助中央高校基本科研业务费专项资金资助

2020YFC190990252002129JZ2023HGTB0256PA2023GDSK0069

2024

硅酸盐通报
中国硅酸盐学会 中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心
影响因子：0.698
ISSN：1001-1625
年,卷(期)：2024.43(1)
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