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Background <p>The development of self-healing cementitious materials offers a promising solution to enhance durability and extend the service life of concrete structures by autonomously repairing cracks. The purpose of this experiment was to compare Microbially Induced Calcite Precipitation with conventional treatments for cement-mortar specimens in terms of compressive strength, crack self-healing abilities, and bacterial metabolism. This study examines the efficacy of microbial self-healing in high-strength mortar, with a particular focus on bacterial strains (<i>Bacillus Subtilis</i>).</p> Results <p>The study examined compressive strength, crack recovery, water permeability, oxygen uptake rate of the modified cement mortar compared to the control ones over a time period of 28&#xa0;days. The results indicated that modified cement-mortar samples cured in 0.25 and 0.5&#xa0;M chemical and bacterial solutions showed better strength compared to control samples. Even samples cured in 0.5&#xa0;M solutions showed better early strength gain compared to 0.25&#xa0;M ones. High CaCO<sub>3</sub> deposits were found in the bacterial samples from microscopic pictures, suggesting that microbially induced calcite precipitation filled the tiny fissures and boosted strength. Bacterial samples with reduced water permeability showed calcite-filled fissures. Oxygen consumption showed that bacterial activity was ongoing based on the oxygen uptake rate.</p> Conclusion <p>A bacterial concentration of 0.5&#xa0;M was optimal since it enhanced the microstructure’s compressive strengths. This study promotes the use of microorganisms to produce more resilient and ecofriendly building materials, improving the sustainability of construction methods.</p>

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Performance analysis of Bacillus Subtilis implied self-healing cement mortar at local laboratory environment

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月6日

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  • Mohammad Shahidur Rahman,
  • Shofiur Rahman,
  • Md Saadman Chowdhury,
  • Md Razwanur Rashid Shuvo,
  • Anisur Rahman

摘要

Background

The development of self-healing cementitious materials offers a promising solution to enhance durability and extend the service life of concrete structures by autonomously repairing cracks. The purpose of this experiment was to compare Microbially Induced Calcite Precipitation with conventional treatments for cement-mortar specimens in terms of compressive strength, crack self-healing abilities, and bacterial metabolism. This study examines the efficacy of microbial self-healing in high-strength mortar, with a particular focus on bacterial strains (Bacillus Subtilis).

Results

The study examined compressive strength, crack recovery, water permeability, oxygen uptake rate of the modified cement mortar compared to the control ones over a time period of 28 days. The results indicated that modified cement-mortar samples cured in 0.25 and 0.5 M chemical and bacterial solutions showed better strength compared to control samples. Even samples cured in 0.5 M solutions showed better early strength gain compared to 0.25 M ones. High CaCO3 deposits were found in the bacterial samples from microscopic pictures, suggesting that microbially induced calcite precipitation filled the tiny fissures and boosted strength. Bacterial samples with reduced water permeability showed calcite-filled fissures. Oxygen consumption showed that bacterial activity was ongoing based on the oxygen uptake rate.

Conclusion

A bacterial concentration of 0.5 M was optimal since it enhanced the microstructure’s compressive strengths. This study promotes the use of microorganisms to produce more resilient and ecofriendly building materials, improving the sustainability of construction methods.