骨料界面效应下含初始缺陷再生混凝土弹性模量的均匀化预测  

Homogenization Prediction of Elastic Modulus of Recycled Aggregate Concrete with Initial Defects under Aggregate Interface Effects

作　　者：柴正一 盛冬发 秦飞飞 霍晓伟 CHAI Zhengyi;SHENG Dongfa;QIN Feifei;HUO Xiaowei(College of Civil Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学土木工程学院,昆明650224

出　　处：《硅酸盐通报》2023年第10期3538-3545,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(11862023);云南省教育厅科学研究基金(2023Y0772,2023Y0774)。

摘　　要：为了合理地设计和利用再生混凝土,在再生混凝土均匀化过程中,综合考虑原生骨料界面处较大的孔隙率、砂浆处的孔洞和微裂缝,以及骨料界面效应,同时结合扭转变形原理、Mori-Tanaka方法、微分法和Christensen三相模型,建立了一套可预测骨料界面效应下含初始缺陷再生混凝土弹性模量的模型。计算结果表明,当再生骨料取代率由0%增加到100%(质量分数)时,再生混凝土的弹性模量会降低24.4%,新水泥砂浆和原生骨料弹性模量的下降会导致再生混凝土的弹性模量出现不同程度的降低,预测模型能较好地预测界面效应下含初始缺陷再生混凝土弹性模量,并实现参数化分析。In order to reasonably design and utilize recycled aggregate concrete,the larger porosity at the interface of primary aggregate,the pores and microcracks at the mortar and the aggregate interface effect were considered in the homogenization process of recycled aggregate concrete.A set of models that can predict the elastic modulus of recycled aggregate concrete with initial defects under aggregate interface effects was also developed by combining with the torsional deformation principle,Mori-Tanaka method,differential method and Christensen’s three-phase model.The calculation results show that with the increase of recycled aggregate replacement rate from 0%to 100%(mass fraction),the elastic modulus of recycled aggregate concrete decreases by 24.4%,and the decrease of elastic modulus of new mortar and primary aggregate also lead to the decrease the elastic modulus of recycled aggregate concrete by different degrees.The prediction model can better predict the elastic modulus of recycled aggregate concrete with initial defects under the interface effect,and realize parametric analysis.

关 键 词：初始缺陷 界面效应 再生混凝土 弹性模量 均匀化方法 三相模型 

分 类 号：TU528[建筑科学—建筑技术科学]