低温环境微生物灌入法修复砂浆效果及性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (2): 478-486.

所属专题：水泥混凝土

低温环境微生物灌入法修复砂浆效果及性能研究

倪勇军¹, 李文荣¹, 宋维昌¹, 张生华¹, 李军², 田乾², 关博文²

1.青海省果洛公路工程建设有限公司,西宁 430070;
2.长安大学材料科学与工程学院,西安 710064

收稿日期:2023-08-04 修订日期:2023-11-20 出版日期:2024-02-15 发布日期:2024-02-05
通信作者: 李军,博士,讲师。E-mail:jun_li1992@163.com
作者简介:倪勇军(1980—),男。主要从事公路工程管理与施工方面的研究。E-mail:niyongjun1980@163.com
基金资助:
青海省重点研发与转化计划(2023-SF-123)

Effect and Performance of Microbial Healing Technology on Mortar Through Injection Method at Low Temperature

NI Yongjun¹, LI Wenrong¹, SONG Weichang¹, ZHANG Shenghua¹, LI Jun², TIAN Qian², GUAN Bowen²

1. Qinghai Guoluo Highway Engineering Construction Co., Ltd., Xining 430070, China;
2. School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China

Received:2023-08-04 Revised:2023-11-20 Online:2024-02-15 Published:2024-02-05

摘要/Abstract

摘要： 为解决低温环境下常用微生物生长活性降低而导致对混凝土的修复能力减弱的问题,本文采用灌入法研究了嗜温和耐寒细菌及两者组合在室温和低温下对砂浆裂缝的修复效果,并通过对比修复前后砂浆试件的抗折和抗压强度,对不同细菌和矿化液组合的修复效果进行了定量评价。结果表明,细菌对砂浆裂缝的修复效果与其在不同温度下的生长活性相关,与嗜温的巴氏芽孢杆菌fwzy14相比,耐寒短杆菌A779在常温和低温下均具有较强的生长活性,因此在试验温度下表现出更强的修复能力。当以硝酸钙作为钙源时,A779可以通过有氧呼吸和硝酸盐还原两种方式代谢,可以在裂缝深处缺氧区域生长代谢,从而对裂缝进行深度修复。

关键词: 混凝土微生物修复, 低温, 耐寒短杆菌, 灌入法, 抗折强度, 抗压强度

Abstract: To address the issue of reduced growth activity of common microorganisms in low-temperature environments, which leads to a decrease in their ability to repair concrete, the healing effects of mesophilic and cold-resistant bacteria and their combination on the prefabricated crack in mortar specimen were investigated through injection method and quantitatively evaluated by comparing the flexural and compressive strength of mortar specimens before and after healing. The results show that the healing effect of microorganism on mortar cracks is related to its growth activity at different temperatures. Compared with Sporosarcina pasteuri fwzy14, which can only grow well at room temperature, the cold-resistant Brevibacterium frigoritolerans A779 has the capacity of growing at both room and low temperature, and therefore shows more balanced repairing ability. In addition, A779 can metabolize through both aerobic respiration and nitrate reduction with calcium nitrate as precursor, which enables it to grow inside the crack that is anoxic and repair the crack in depth.

Key words: microbial healing of concrete, low temperature, Brevibacterium frigoritolerans, injection method, flexural strength, compressive strength

中图分类号:

TU502

倪勇军, 李文荣, 宋维昌, 张生华, 李军, 田乾, 关博文. 低温环境微生物灌入法修复砂浆效果及性能研究[J]. 硅酸盐通报, 2024, 43(2): 478-486.

NI Yongjun, LI Wenrong, SONG Weichang, ZHANG Shenghua, LI Jun, TIAN Qian, GUAN Bowen. Effect and Performance of Microbial Healing Technology on Mortar Through Injection Method at Low Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 478-486.

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低温环境微生物灌入法修复砂浆效果及性能研究

Effect and Performance of Microbial Healing Technology on Mortar Through Injection Method at Low Temperature

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