添加氧化铝对微生物修复裂缝影响的分析

陈润发1 缪林昌1 孙潇昊1 吴林玉1 王呈呈1

(1.东南大学交通学院岩土工程研究所, 江苏南京 211189)

【摘要】微生物修复裂缝技术由于环保经济的特点被广泛关注,但修复效率因混凝土内碱性环境受到很大影响;开展提高该技术的修复效率与效果的研究具有重要意义。探究高碱性环境下Al2O3对微生物钙化的促进作用,然后添加Al2O3对不同裂缝宽度的混凝土试件进行修复,修复中检测浸出液pH值与尿素含量,修复后通过声时值、碳酸钙生成效率、无侧限抗压强度等指标评价修复效果。结果表明:Al2O3能够降低碱性环境对细菌活性的抑制,提升其脲酶活性与碳酸钙转化效率。添加Al2O3使试件浸出液p H值从12降为9,pH值为9时更适合菌种的繁殖,尿素利用率显著提升到81%,提高了碳酸钙的产出率,明显缩短修复时间。添加Al2O3修复试件的声时值接近无裂缝试件,明显优于无添加试件。添加Al2O3后2 mm裂缝试件的碳酸钙生成率为77.32%,远高过无添加试件的20.98%。添加Al2O3修复试件强度恢复远高于无添加Al2O3修复试件,且强度恢复随裂缝宽度减小而增加。因此,混凝土修复过程中添加Al2O3能有效提高修复效率,减少修复时间,为后续实际工程中微生物快速高效修复裂缝提供重要参考。

【关键词】 裂缝修复; 氧化铝; 声时值; 碳酸钙产率; 强度恢复;

【DOI】

【基金资助】 国家自然科学基金项目(No.51578147) the National Natural Science Foundation Project(51578147)

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This Article

ISSN:1000-7598

CN:42-1199/O3

Vol 41, No. 03, Pages 933-938+951

March 2020

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Article Outline

摘要

  • 1 引言
  • 2 材料和方法
  • 3 氧化铝对MICP进程的影响
  • 4 微生物裂缝修复
  • 5 结论
  • 参考文献