复相机敏混凝土弯敏特性研究  

Study on Flexural Sensitivity of Smart Concrete with Compounding Functional Filler

作　　者：朱广富[1] 孙亚飞[1] 彭月月 周天舒 吴发红[1] ZHU Guangfu;SUN Yafei;PENG Yueyue;ZHOU Tianshu;WU Fahong(School of Civil Engineering,Yancheng Institute of Technology,Yancheng,Jiangsu 224051,China;School of Civil and Architectural Engineering,Anhui University of Science and Technology,Huainan,Anhui 232000,China;School of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]盐城工学院土木工程学院,江苏盐城224051 [2]安徽理工大学土木建筑学院,安徽淮南232000 [3]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《西昌学院学报（自然科学版）》2022年第3期57-61,共5页Journal of Xichang University(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51978597)。

摘　　要：为了研究碳纤维(CF)、镀铜钢纤维(SF)、多壁碳纳米管(MWCNTs)和炭黑(CB)4种功能材料掺量对复相机敏混凝土抗弯强度、电阻率与弯敏特性的影响规律,通过改变4种功能材料掺量方法设计了9组对比试验,分别采用二电极法、三点加载法测试试样的电阻率与弯敏性能。结果表明:(1)CF与SF是影响复相机敏混凝土弯敏特性的主要因素。(2)当4种导电材料的掺量比(CF∶SF∶MWCNTs∶CB)为1.2∶4∶0.25∶4时,试块28 d电阻率为887.5?·cm;当4种导电材料掺量比为0.3∶4∶0.5∶2时,试块抗弯强度最高;当构件挠度达到4 mm时,最大电阻变化率为158%,受弯机敏性较好,回归方程相关系数均大于0.95,复相机敏混凝土在受弯过程中电阻变化率与挠度变化关系相关性较好。The effects of conductive materials such as carbon fiber(CF),copper-coated steel fiber(SF),multi-walled carbon nanotubes(MWCNTs)and carbon black(CB)on the bending strength,electric resistivity and flexural sensitivity of smart concrete with compounding functional filler were studied. Nine groups of comparative experiments were designed by changing the content of four functional materials,in which the two-electrode method and the three-point loading method were used to test the resistivity and flexural sensitivity of the samples. The results show that:(1)CF and SF are the main factors affecting the flexural sensitivity of the material.(2)When the content ratio of four conductive materials(CF∶SF∶MWCNTs∶CB)is 1.2∶4∶0.25∶4,the 28 d resistivity of the specimen is 887.5 Ω·cm;When the content ratio of four conductive materials is 0.3∶4∶0.5∶2,the flexural resistance of the specimen is the highest;When the deflection of the structural member reaches 4 mm,the maximum resistivity change rate is 158%,the flexural sensitivity is better,the correlation coefficients of the regression equation are all greater than 0.95,and the correlation between the resistance change rate and the deflection change of the material during the bending process is better.

关 键 词：复相机敏混凝土 导电材料 抗弯强度 电阻率 灵敏度 

分 类 号：TU528.59[建筑科学—建筑技术科学]