自密实全再生混凝土单轴受压性能及强度指标换算关系研究  

Study on uniaxial compression performance and strength index conversion relationship of self-compacting fully recycled concrete

作　　者：韦柳媚 郑述芳 黄媚 陈祥花 廖浩宇 梁莹 陈宗平[1,3,4] WEI Liumei;ZHENG Shufang;HUANG Mei;CHEN Xianghua;LIAO Haoyu;LIANG Ying;CHEN Zongping(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Urban and Rural Construction,Guangxi Vocational University of Agriculture,Nanning 530007,China;School of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西农业职业技术大学城乡建设学院,广西南宁530007 [3]南宁学院土木与工程建筑学院,广西南宁530200 [4]广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《混凝土》2024年第3期17-22,29,共7页Concrete

基　　金：国家自然科学基金(51578163);八桂学者专项经费资助项目([2019]79号);广西科技基地与人才专项(桂科AD21075031);中央引导地方科技发展资金项目(桂科ZY21195010);广西重点研发计划项目(桂科AB21220012);广西农业科技自筹经费项目(Z202232);广西高校中青年教师科研基础能力提升项目(2023KY1225);南宁市科技重大专项(20223024)。

摘　　要：为深入了解自密实全再生混凝土单轴受压力学性能,以水胶比(0.36、0.40、0.45)与粉煤灰掺量(20%、30%、40%、50%、70%)为变化参数,设计并制作11组(共99个)自密实全再生混凝土试件对其立方体抗压强度、轴心抗压强度和弹性模量进行试验研究,观察试件受压破坏过程及破坏形态,获取各力学性能指标的变化趋势,基于试验结果及现有文献成果,建立强度指标换算关系,并提出自密实全再生混凝土的本构方程。研究表明:自密实全再生混凝土受压破坏过程及破坏形态与普通混凝土相似,总体上自密实全再生混凝土立方体抗压强度、轴心抗压强度及弹性模量随水胶比、粉煤灰掺量的增加而降低,所提计算式可较好预测自密实全再生混凝土的单轴受压性能指标及本构关系。In order to deeply understand the uniaxial compression performance of self-compacting fully recycled concrete,11 groups(99 in total)of self-compacting fully recycled concrete specimens were designed and manufactured with water-binder ratio(0.36,0.40,0.45)and fly ash content(20%,30%,40%,50%,70%)as changing parameters.The cube compressive strength,axial compressive strength and elastic modulus were tested and studied.The compression failure process and failure mode of the specimens were observed,and the change trend of each mechanical performance index was obtained.Based on experimental results and previous literature results,the conversion relationship of strength index was established.The constitutive equation of self-compacting recycled concrete is proposed.The results show that the failure process and failure mode of self-compacting fully recycled concrete are similar to those of ordinary concrete.In general,the cubic compressive strength,axial compressive strength and elastic modulus of self-compacting fully recycled concrete decrease with the increase of water-binder ratio and fly ash content.The proposed formula can better predict the uniaxial compression performance index and constitutive relationship of self-compacting fully recycled concrete.

关 键 词：自密实全再生混凝土 抗压强度 弹性模量 粉煤灰 水胶比 强度指标换算关系 本构方程 

分 类 号：TU528.53[建筑科学—建筑技术科学]