吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (2): 641-647.doi: 10.13229/j.cnki.jdxbgxb20181001

• 交通运输工程·土木工程 • 上一篇    

微生物矿化作用下混凝土裂缝修复与性能补偿

袁杰1(),陈歆1,2(),何虹霖1,杨博1,朱小骏2,3   

  1. 1.哈尔滨工业大学 交通科学与工程学院, 哈尔滨 150090
    2.苏交科集团股份有限公司 在役长大桥梁安全与健康国家重点实验室, 南京 210019
    3.河海大学 土木与交通学院，南京 210098
  • 收稿日期:2018-09-29 出版日期:2020-03-01 发布日期:2020-03-08
  • 通讯作者: 陈歆 E-mail:hityuanj@163.com;xin.chen@alu.hit.edu.cn
  • 作者简介:袁杰（1971-），男，副教授，博士.研究方向：道路工程材料.E-mail:hityuanj@163.com
  • 基金资助:
    国家自然科学基金项目(51278157);江苏省青年基金项目(BK20160144)

Repair and rejuvenation of cracked concrete by microbiologically⁃induced calcite⁃precipitation

Jie YUAN1(),Xin CHEN1,2(),Hong-lin HE1,Bo YANG1,Xiao-jun ZHU2,3   

  1. 1.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
    2.State Key Laboratory of Safety and Health for In?service Long Span Bridges, JSTI Group, Nanjing 210019, China
    3.College of Civil Engineering and Transportation Engineering, Hohai University, Nanjing 210098, China
  • Received:2018-09-29 Online:2020-03-01 Published:2020-03-08
  • Contact: Xin CHEN E-mail:hityuanj@163.com;xin.chen@alu.hit.edu.cn

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摘要：

为全面评价基于微生物矿化的混凝土修补效率与效果，采用巴氏生孢八叠球菌，通过产物晶相分析优选钙源，配制微生物-尿素-钙源体系修复液，修复混凝土裂缝并扫描评价物理封堵效率；然后对不同裂缝状态下的混凝土进行吸水率、抗氯离子渗透性、抗冻性和抗硫酸盐侵蚀等试验，考察微生物矿化作用对开裂混凝土耐久性的补偿效果。结果表明：硝酸钙是良好钙源，沉积的方解石封闭了裂缝表面并填充裂缝体积50%以上，修复后混凝土抗渗性恢复显著，抗冻性与抗硫酸盐侵蚀性能也有所补偿。本文推荐了微生物技术的钙源，评价了该修补方法的效率，并肯定了其对开裂混凝土耐久性的补偿效果。

关键词: 建筑材料, 混凝土, 修复, 微生物, 耐久性

Abstract:

The research was conducted to comprehensively study the efficiency and effectiveness of bacteria-based concrete repair technology. In the research, Sporosarcina pasteurii were applied as working bacteria in healing agent, the calcium source was selected by analysis of product crystalline phases. The prepared healing agent was used to repair cracked concrete specimens. After repair computed tomography was applied to evaluate the physical sealing. Specimens with and without cracking and specimens with crack-sealing were processed, and a series of durability tests were conducted to study the sealing caused rejuvenation, including water absorption, chloride penetration resistance, frost resistance and sulfate attack resistance. Results show that calcium nitrate is suitable as calcium source, which reacts with hydrolysed urea to entirely seal the crack surface and can fill more than half of the crack space. The impermeability of the cracked concrete is greatly rejuvenated after repair, and both frost resistance and sulfate attack resistance are compensated in certain scale. This research has recommended calcium nitrate as calcium source for bacteria-based mineralization, evaluated sealing efficiency, and importantly, confirmed a good rejuvenation in concrete durability.

Key words: building materials, concrete, repair, microorganism, durability

中图分类号: 

  • TU57+8

图1

试件表面处理"

图2

产物晶相分析结果"

图3

试件修复前、后CT扫描图像"

图4

各层修复前、后的空隙面积"

图5

48 h吸水率"

图6

裂缝在冻融循环条件下的表现"

图7

冻融循环下质量损失率"

图8

冻融循环下抗压强度变化"

图9

裂缝在硫酸盐侵蚀下的表现"

图10

硫酸盐侵蚀下质量损失率变化"

图11

硫酸盐侵蚀下抗压强度变化"

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