摘要
选用低碱性的硫铝酸盐水泥(SAC)作为载体来负载微生物芽孢,对比研究浸泡在水泥基材料模拟孔隙中不同时间后,SAC负载保护和无负载的微生物芽孢的复活能力。同时研究了开裂龄期为90 d时SAC负载微生物对砂浆试件后期裂缝的自修复效果,并对其自修复机理进行了详细的探讨。研究结果表明:在水泥基模拟孔隙溶液中,与未负载的芽孢相比,SAC负载芽孢具有更好的保护效果,在水泥基材料模拟孔隙溶液浸泡90 d后,芽孢仍具有良好的活性。对于0.3~0.4 mm的砂浆裂缝,经28 d的修复养护后,面积修复率高达100%,渗水系数下降两个数量级,裂缝平均修复深度为2246.9μm。水泥基材料裂缝的自修复过程主要是通过微生物矿化作用来实现的。
Low alkaline sulphoaluminate cement(SAC)was used as carrier to encapsulate microbial spores,and the reactivation ability of SAC encapsulated and unencapsulated microbial spores was compared and studied after being soaked in simulated pore solution of cement-based materials for different time.Meanwhile,the self-healing effect of SAC-encapsulated spores on the later age cracks of mortar specimens was studied when the cracking age was 90 d,and the self-healing mechanism was discussed in detail.The results showed that in the simulated pore solution of cement-based materials,SAC-encapsulated spores had better protection effect than the unencapsulated spores,and the spores still had good activity after being soaked in the cement-based simulated pore solution for 90 d.For the width of 0.3-0.4 mm mortar cracks,after 28 d healing time,the area repair ratio was as high as 100%,the water permeability coefficient decreased by two orders of magnitude,and the average healing depth of cracks was 2246.9μm.The self-healing process of cement-based materials cracks was mainly realized by microbial mineralization.
作者
任蓉
闫建文
REN Rong;YAN Jianwen(School of Architectural Engineering Hohhot Vocational College,Hohhot 010020,China;College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University,Hohhot 010018,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2023年第2期290-299,共10页
Journal of Materials Science and Engineering
基金
内蒙古自然基金资助项目(2020MS05052)。
关键词
硫铝酸盐水泥
微生物芽孢
保护
后期裂缝
微生物矿化
Sulphoaluminate cement
Microbial spores
Protection
Later age cracks
Microbial mineralization
