低温微生物诱导碳酸钙沉积及其在混凝土裂缝修复中的应用研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (3): 959-968.

低温微生物诱导碳酸钙沉积及其在混凝土裂缝修复中的应用研究

易丹¹, 杨国军²

1.江苏城乡建设职业学院管理工程系,常州 213000;
2.东南大学土木工程学院,南京 210096

收稿日期:2021-11-07 修回日期:2022-01-10 出版日期:2022-03-15 发布日期:2022-04-08
作者简介:易丹(1983—),女,讲师。主要从事水泥基材料裂缝自修复方向的研究。E-mail:yidanjs@163.com
基金资助:
国家自然科学基金(51978163);住房和城乡建设部2020年科学技术计划项目(2020-K-192)

Low Temperature Microbial Induced Calcium Carbonate Precipitation and Its Application in Concrete Crack Repair

YI Dan¹, YANG Guojun²

1. Department of Management Engineering, Jiangsu Urban and Rural Construction College, Changzhou 213000, China;
2. School of Civil Engineering, Southeast University, Nanjing 210096, China

Received:2021-11-07 Revised:2022-01-10 Online:2022-03-15 Published:2022-04-08

摘要/Abstract

摘要： 近些年来,对于混凝土裂缝的修复,微生物诱导碳酸钙沉积(MICP)已成一种高效和环境友好的技术。本文选用一种可在低温环境下生长的矿化微生物,然后在碱性溶液中研究Ca²⁺浓度、pH值和钙化速率的变化,来揭示微生物诱导矿化的动态过程。随后,将此微生物应用到混凝土裂缝自修复中,同时采用裂缝愈合率和渗水系数来表征混凝土裂缝的自修复效果。试验结果表明,微生物能够快速降低溶液中的Ca²⁺浓度,并提高钙化速率,矿化产物主要是球状方解石CaCO₃。对于宽度小于0.50 mm的早期混凝土裂缝,在10 ℃的养护温度下,28 d修复后裂缝表面基本能被白色物质填充,渗水系数下降2个数量级,并且裂缝区修复产物主要是大小不一的球状方解石CaCO₃。

关键词: 低温, 微生物, 矿化, 裂缝自修复, 自修复效果, 钙化速率, 碳酸钙

Abstract: In recent years, microbial induced calcium carbonate precipitation (MICP) has become an efficient and environmentally friendly technology for repairing concrete cracks. In this paper, a mineralization microorganism that grows in a low temperature environment was selected, and then the changes of Ca²⁺ concentration, pH value and calcification rate were studied in alkaline solution to reveal the dynamic process of microbial induced mineralization. Subsequently, the microorganism was applied to the self-healing of concrete cracks, and the crack healing ratio and permeability coefficient were used to characterize the self-healing effect of concrete cracks. The results show that the microorganism quickly reduces the Ca²⁺ concentration in the solution and increases the calcification rate. Meanwhile, the mineralization products are mainly spherical calcite CaCO₃. For the early concrete cracks with the width of less than 0.50 mm, the surface of the crack basically fills with white precipitations after 28 d healing time at the curing temperature of 10 ℃, and the permeability coefficient drops by two orders of magnitude. In addition, the healing products at the crack mouth are mainly spherical calcite CaCO₃ with different sizes.

Key words: low temperature, microorganism, mineralization, crack self-healing, self-healing effect, calcification rate, calcium carbonate

中图分类号:

易丹, 杨国军. 低温微生物诱导碳酸钙沉积及其在混凝土裂缝修复中的应用研究[J]. 硅酸盐通报, 2022, 41(3): 959-968.

YI Dan, YANG Guojun. Low Temperature Microbial Induced Calcium Carbonate Precipitation and Its Application in Concrete Crack Repair[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 959-968.

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