高温后冻融玄武岩纤维再生混凝土力学性能  

Mechanical behaviour of freeze-thaw basalt fiber reinforced recycled aggregate concrete after high temperature

作　　者：郑君 张信龙 郭瑞晋 吕学涛 ZHENG Jun;ZHANG Xinlong;GUO Ruijin;LU Xuetao(School of Architectural Engineering,Guangzhou Vocational University of Science and Technology,Guangzhou 510000,China;China Northeast Architectural Design and Research Institute Co.,Ltd.,Shenyang 110000,China;Taiyuan Institute of Technology,Taiyuan 030008,China;School of Communications and Civil Architecture,Foshan University,Foshan 528231,China)

机构地区：[1]广州科技职业技术大学建筑工程学院,广东广州510000 [2]中国建筑东北设计研究院有限公司,辽宁沈阳110000 [3]太原工业学院,山西太原030008 [4]佛山大学交通与土木建筑学院,广东佛山528231

出　　处：《混凝土》2025年第3期46-50,共5页Concrete

基　　金：广东省教育厅普通高校创新团队项目(2024KCXTD068);广东省教育厅普通高校青年创新人才项目(2024KQNCX087);广东省教育厅普通高校特色创新项目(2023KTSCX218);辽宁省教育厅项目(LJKZ0336);广州科技职业技术大学2024年度校级课题(2024LG02)。

摘　　要：通过玄武岩纤维再生混凝土慢冻试验,研究不同玄武岩纤维掺量(0、0.10%、0.15%和0.20%)在冻融损伤条件下玄武岩纤维再生混凝土(BFRRAC)质量损失率、相对动弹性模量及损伤度,对相应试块进一步进行高温(20℃、200℃、400℃和600℃)试验,对冷却后试件进行试验,分析玄武岩纤维再生混凝土质量损失率、抗压强度、应力-应变关系曲线及劈裂抗拉强度与纤维掺量的关系.结果表明:经历25次冻融循环作用后,BFRRAC质量损失率及损伤度随纤维体积掺量增大而降低,相对动弹性模量随纤维掺量增大而增大;受冻融损伤影响的玄武岩纤维再生混凝土高温后质量损失率随温度升高而增大;对玄武岩纤维再生混凝土抗压强度、应力-应变关系曲线、劈裂抗拉强度影响最大的玄武岩纤维掺量为0.15%,为最优掺量。The quality loss,relative dynamic modulus of elasticity,and damage degree of different basalt fiber(0,0.10%,0.15%,0.20%)reinforced recycled aggregate concrete were studied by slow freezing test.Mechanical behaviours of basalt fiber reinforced recycled aggregate concrete(BFRRAC)subjected to freeze-thaw damage were tested after high temperature(20℃,200℃,400℃,600℃).The quality loss,compressive strength,splitting tensile strength,and stress-strain curve of BFRRAC with different content were analyzed.Test results showed that the quality loss and damage decreased with increasing basalt fiber(BF)content after 25 times freeze-thaw cycles,while relative dynamic modulus of elasticity increase with increasing BF content.The post-fire behaviour of BFRRAC achieved optimal value with BF content of 0.15%.

关 键 词：玄武岩纤维再生混凝土 冻融损伤 高温 力学性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]