BFRP筋与地质聚合物混凝土的粘结滑移特性及海水环境下时变规律  

Bond slip characteristics of BFRP reinforcement and geopolymer concrete and their time-varying behavior in seawater environment

作　　者：杨永民 唐昀超 冯万辉 李松 于磊 吴玉友 杨智诚 YANG Yongmin;TANG Yunchao;FENG Wanhui;LI Song;YU Lei;WU Yuyou;YANG Zhicheng(College of Urban and Rural Construction,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China;Guangdong Lingnan Township Green Building Industrialization Engineering Technology Research Center,Guangzhou 510225,China;Institute of Sustainable Building and Energy Conservation,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China;Center for Marine Materials and Structures,Florida Atlantic University,Boca Raton 32611,USA)

机构地区：[1]仲恺农业工程学院城乡建设学院,广东广州510225 [2]广东省岭南乡镇绿色建筑工业化工程技术研究中心,广东广州510225 [3]仲恺农业工程学院可持续建筑与节能研究所,广东广州510225 [4]佛罗里达大西洋大学海洋材料与结构中心,佛罗里达博卡拉顿32611

出　　处：《仲恺农业工程学院学报》2023年第3期18-25,共8页Journal of Zhongkai University of Agriculture and Engineering

基　　金：广东省自然科学基金(2022A1515010853、2022A1515111011、2023A1515011671);广州市科技计划项目(2023A04J0647).

摘　　要：为了分析玄武岩纤维筋的粘结滑移特性以及长期暴露在海洋环境中的配筋混凝土的长期粘结滑移时变行为,研究了玄武岩纤维(Basalt fiber-reinforced polymer,BFRP)筋增强地质聚合物混凝土中筋尺寸、腐蚀龄期和混凝土强度对人工海水作用下混凝土中BFRP筋粘结滑移行为的影响,并采用改进的Bertero-Popov-Eligehausen(BPE)模型来描述BFRP筋的粘结滑移行为.结果表明,随BFRP筋直径的增大,BFRP筋与地质聚合物混凝土间的极限粘结强度与对应的滑移均逐渐降低,极限滑移与对应的粘结强度也逐渐降低,经过90 d海水腐蚀后极限粘结强度与对应的滑移降低,粘结滑移曲线出现了水平段,提高混凝土强度等级对提高海水环境下BFPR筋和混凝土之间粘结性能有利.改进的BPE模型更加适合表征BFRP筋与混凝土之间的粘结滑移,海水腐蚀后曲线的上升段更加趋于刚性,曲线的下降段更加趋于柔性.In order to analyze the bond slip characteristics of basalt fiber-reinforced steel bars and the long-term bond slip time-varying behaviors of reinforced concrete exposed to marine environments,the effects of bar size,corrosion age,and concrete strength of the Basalt fiber-reinforced polymer(BFRP)on the bond slip behavior of BFRP bars in concrete under artificial seawater were studied.An improved Bertero-Popov-Eligehausen(BPE)model was used to describe the bond slip behavior of BFRP bars.The results showed that as the diameter of BFRP bars increased,the ultimate bond strength and corresponding slip between BFRP bars and geopolymer concrete gradually decreased,and the ultimate slip and corresponding bond strength also gradually decreased.After 90 days of seawater corrosion,the ultimate bond strength and corresponding slip decreased,and the bond slip curve showed a horizontal section.Improving the concrete strength grade was beneficial for improving the bond performance between BFPR bars and concrete in seawater environment.The improved BPE model was more suitable for characterizing the bond slip between BFRP bars and concrete.After seawater corrosion,the rising section of the curve tended to be more rigid,and the falling section of the curve tended to be more flexible.

关 键 词：玄武岩纤维筋 地质聚合物混凝土 粘结滑移特性 时变规律 

分 类 号：TU521[建筑科学—建筑技术科学]