不同矿化底物及掺量对自愈混凝土修复效果和力学性能的影响  

Impact of Various Mineralized Substrates and Dosages on Repairing Efficacy and Mechanical Properties of Self-healing Concrete

作　　者：刘晓[1] 耿俊峰 王浩 LIU Xiao;GENG Junfeng;WANG Hao(College of Architecture and Engineering,Shenyang University,Shenyang,Liaoning 110044,China)

机构地区：[1]沈阳大学建筑工程学院,辽宁沈阳110044

出　　处：《水利与建筑工程学报》2025年第2期10-18,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(52078306)。

摘　　要：矿化底物作为微生物诱导碳酸钙沉积技术中关键的功能组分,其种类和掺量对自修复混凝土的裂缝修复效果和力学性能具有重要作用。为深入研究矿化底物的作用机制,选用巴氏芽孢杆菌作为矿化微生物,以25%取代率的再生骨料作为载体,在不同矿化底物及其在不同掺量下系统研究其对混凝土裂缝修复能力和基本力学性能的影响。结果表明:在经过28 d修复养护后,制备出的自修复混凝土具有优异的裂缝自修复能力,以乳酸钙、尿素和营养物质为底物制备出的混凝土的裂缝修复能力最好,其平均和最大修复宽度分别为0.31 mm和0.6 mm。以乳酸钙和尿素为矿化底物,且掺量为胶凝材料质量分数2%的混凝土的力学性能最好。As a critical functional component of microbially induced calcium carbonate precipitation technology,the type and dosage of mineralization substrates significantly influence the crack repair efficiency and mechanical properties of self-healing concrete.To further investigate the mechanism of mineralization substrates,this work selected Bacillus pasteurii as the mineralizing microorganism and utilized recycled aggregates with a 25%replacement rate as carriers.A series of experimental schemes with different types and dosages of mineralization substrates were designed to systematically evaluate their effects on the crack repair capability and basic mechanical properties of concrete,providing a reference for optimizing the design of self-healing concrete.The results show that the self-healing concrete prepared after 28 days of repair and maintenance had excellent crack self-healing ability.The concrete prepared with calcium lactate,urea and nutrients as substrates had the best crack repair ability.The average and maximum repair widths were 0.31 mm and 0.6 mm,respectively.The mechanical properties of concrete with calcium lactate and urea as mineralized substrates and 2%of the mass fraction of cementitious materials were the best.

关 键 词：再生骨料 微生物矿化 裂缝自修复 矿化底物 底物掺量 修复能力 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]