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To reduce carbon emissions in the construction industry, this study uses Bacillus subtilis as a carbon fixation medium to achieve CO2 sequestration in cement-based materials. By combining shale ceramsite carriers with discrete element simulations, the microscopic reinforcement mechanism of microbial carbon fixation is revealed. The results show that when the carrier content is 8% with a particle size of 60–80 mesh, the strength of the cement mortar increases by 5.61%, and its multi-grading characteristic optimizes the material density. When the calcium carbonate generation amount is 50% and the particle size is 10–15 μm, the microcracks are optimally filled, leading to a strength increase of 18.36%. The vacuum adsorption carrier loading rate reaches 38.6%, maintaining microbial activity in a strong alkaline environment. This technology enhances material strength and carbon fixation efficiency through the CO2 mineralization-self-healing synergistic mechanism, providing an innovative path for the low-carbon transformation of the construction industry.

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Microbial Carbon Sequestration and Performance Enhancement of Cement Mortar via Synergistic Action of Bacillus Subtilis and Shale Ceramsite

  • 会议论文

  • 发表日期：

    2026年

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  • Yawei Zhang,
  • Yuxi Deng,
  • Yujia Pu,
  • Chengyi Liao,
  • Qie Mei,
  • Mingming Zheng

摘要

To reduce carbon emissions in the construction industry, this study uses Bacillus subtilis as a carbon fixation medium to achieve CO2 sequestration in cement-based materials. By combining shale ceramsite carriers with discrete element simulations, the microscopic reinforcement mechanism of microbial carbon fixation is revealed. The results show that when the carrier content is 8% with a particle size of 60–80 mesh, the strength of the cement mortar increases by 5.61%, and its multi-grading characteristic optimizes the material density. When the calcium carbonate generation amount is 50% and the particle size is 10–15 μm, the microcracks are optimally filled, leading to a strength increase of 18.36%. The vacuum adsorption carrier loading rate reaches 38.6%, maintaining microbial activity in a strong alkaline environment. This technology enhances material strength and carbon fixation efficiency through the CO2 mineralization-self-healing synergistic mechanism, providing an innovative path for the low-carbon transformation of the construction industry.