纤维增强微生物混凝土抗裂性能及自修复试验  

Crack resistance and self-healing experiment of fiber reinforced microbial concrete

作　　者：孟永东[1,2] 程林 徐晓蔚 蔡征龙[1,2] 田斌 MENG Yongdong;CHENG Lin;XU Xiaowei;CAI Zhenglong;TIAN Bin(Hubei Key Laboratory of Hydropower Engineering Construction and Management,Three Gorges University,Yichang 443002,China;College of Water Conservancy and Environment,Three Gorges University,Yichang 443002,China)

机构地区：[1]水电工程施工与管理湖北省重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《水力发电学报》2024年第8期22-31,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金面上项目(52179137)。

摘　　要：为了探究纤维对微生物混凝土抗裂性能和裂缝自修复效果的改善作用,试验优选出聚丙烯腈纤维并掺入微生物混凝土中,测试掺入纤维后微生物混凝土的力学性能、自修复养护期的裂缝透水性和裂缝残余宽度。试验结果表明,当纤维掺量为1.5 kg/m^(3)时,混凝土试件的劈裂抗拉强度恢复至未加载体试件的95.1%;修复养护28 d后,平均裂缝宽度为0.43 mm的试件透水性系数由3.35×10^(-5)m/s降至3.40×10^(-6)m/s,降幅达89.9%;能够愈合的最大裂缝宽度为0.82 mm。在微生物自修复混凝土中掺入纤维可有效提高其抗裂性能,增强裂缝自修复效果。To explore the effect of fiber on the self-healing effect of microbial concrete cracks,polyacrylonitrile fiber is selected and incorporated into microbial concrete;an experiment is conducted to test the mechanical properties of microbial concrete blended with fiber,its crack permeability,and the residual crack width during its self-healing cure.The results show the concrete specimen with a fiber content of 1.5 kg/m^(3) has a splitting tensile strength that recovers to 95.1%of that of the specimen without microbial carrier.After 28 days,the permeability coefficient of the specimen with an average crack width of 0.43 mm is lowered from 3.35×10^(-5) m/s to 3.40×10^(-6) m/s,or a relative decrease of 89.9%.The maximum width of cracks that can self heal is 0.82 mm.The incorporation of fiber into microbial selfhealing concrete effectively improves its crack resistance and enhances the self-healing effect of cracks.

关 键 词：水工混凝土 矿化微生物 MICP 纤维 力学性能 裂缝自修复 

分 类 号：TV431[水利工程—水工结构工程]