高温后再生混凝土力学性能研究  

Research on mechanical properties of recycled aggregate concrete after elevated temperatures

作　　者：李建沛[1] 周莹莹[1] LI Jian-pei;ZHOU Ying-ying(Henan Quality Polytechnic,He'nan Pingdingshan 467000,China)

机构地区：[1]河南质量工程职业学院,河南平顶山467000

出　　处：《消防科学与技术》2018年第12期1609-1613,共5页Fire Science and Technology

基　　金：国家自然科学基金项目(50778119)

摘　　要：为探究再生混凝土高温性能,基于试验对再生混凝土高温后表观变化、质量损失、抗压强度、抗拉强度展开研究。研究结果表明:随着温度的升高,再生混凝土表观颜色由青灰色变为棕黄色,再变为灰白色,最终变为白色泛黄。400～800℃时,随着再生骨料取代率的增加,高温后混凝土质量损失率逐渐增加。再生骨料取代率对混凝土高温后相对抗压强度影响并不显著,但其对相对抗拉强度影响较为明显,随着再生骨料取代率增加,再生混凝土高温后相对抗拉强度逐渐降低。基于试验结果,总结出200～600℃高温后再生混凝土相对抗拉强度折减系数。In order to investigate the high temperature performance of recycled concrete,the apparent change,mass loss,compressive strength and tensile strength are studied on the basis of tests.The results show that with the increase of temperature,the apparent color of regeneration changed from gray to brownish yellow,then to grey,and finally to white and yellow.With the increase of recy.cled aggregate replacement rate,the quality loss rate of recycled concrete gradually increased after 400~800℃of high temperature.The replacement ratio of recycled aggregate on the compressive strength of concrete after high temperature relative influence is not significant,but the tensile strength of concrete after high temperature effect is more obvious,with the increase of recycled aggregate replacement rate,relative tensile strength gradually decreased after high temperature of recycled concrete.Based on the test results,the reduction coefficient of relative tensile strength of recy?cled concrete at high temperature after 200~600℃is summed up.

关 键 词：再生混凝土 高温 抗压强度 抗拉强度 

分 类 号：X932[环境科学与工程—安全科学] TU311[建筑科学—结构工程]