摘要
目前利用微生物修复混凝土裂缝因所用微生物和钙源无法固定在裂缝内部,修复过程需要反复灌浆,限制了微生物修复材料在工程中的应用。为此,本文利用海藻酸钠作为微生物的载体,研究了海藻酸钠溶液质量浓度对材料性能及其混凝土裂缝修复效果的影响,并结合修复产物的矿物组成和微观结构深入分析其对混凝土裂缝的修复效果。结果表明,利用基于海藻酸钠的微生物修复材料修复混凝土裂缝,1次灌浆就能完成封堵,当裂缝宽度为1.5 mm时,其7 d抗渗水率可达到100%,抗压强度恢复率可达到63.64%。
At present,the applications of microbial repair materials in engineering are restricted,because the used bacterial solution and calcium source cannot be fixed inside the cracks and the repair process requires repeated grouting.In this paper,the effect of the mass concentration of sodium alginate solution on the performance of repair material and its concrete crack repair effect were studied by using sodium alginate as a carrier for microorganisms.The repair effect of sodium alginate on the concrete cracks was analyzed in terms of the mineral composition and microstructure of repair products.The results indicated that only once grouting repair of concrete cracks using the microbial repair materials based on sodium alginate could seal the cracks of concrete specimens.The 7-day water penetration resistance of this repair material could reach 100%.Its compressive strength recovery rate reached 63.64%at a crack width of 1.5 mm.
作者
刘鑫
LIU Xin(China Railway Construction and Bridge Engineering Bureau Group Construction and Assembly Technology Co,Ltd,Tianjin 300300)
出处
《中国塑料》
CAS
CSCD
北大核心
2023年第5期22-27,共6页
China Plastics
基金
国家自然科学基金项目(52278268、52278269)
天津市重点研发计划科技支撑计划重点项目(20YFZCSN00520)。
关键词
混凝土
微生物
海藻酸钠
裂缝
修复效果
concrete
microorganism
sodium alginate
crack
repair effect
