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
胡焱博 1高鹏 2李景哲 1章国辉 3王国陶 4董帅志 1储玉婷 1詹炳根 2余其俊2
作者信息
- 1. 合肥工业大学土木与水利工程学院,合肥 230009
- 2. 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
- 3. 中铁四局集团有限公司,合肥 230022
- 4. 海南洋砼新材料有限公司,儋州 578101
- 折叠
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.
Abstract
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Key words
Fourier reconstruction/recycled aggregate/recycled aggregate concrete/meso-structure/aggregate placement algorithm/cohesive zone model引用本文复制引用
基金项目
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)
中央高校基本科研业务费专项资金资助(PA2023GDSK0069)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据