纤维增强微生物混凝土抗裂性能及自修复试验OA北大核心CSTPCD

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/m3 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 self-healing concrete effectively improves its crack resistance and enhances the self-healing effect of cracks.