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<p>Concrete is one of the most widely used building materials globally, but its durability and service life are often compromised by cracking, a common issue. Timely and effective repair of initial microcracks is essential to prevent their propagation, reduce maintenance costs, and extend the lifespan of concrete structures. An innovative and eco-friendly solution involves incorporating microorganisms and other suitable additives into the mix design, creating bio-concrete. This study aims to identify the optimal proportions of micro-silica and the ideal concentration of microbial species to enhance concrete performance and explore their application as repair agents for cracked concrete. The impact of adding microorganisms and micro-silica to concrete on mechanical strength and water permeability was thoroughly examined. Mix designs were developed with varying micro-silica percentages, Bacillus subtilis concentrations, and combinations of both, to investigate the self-healing properties of bacterial concrete. The study assessed concrete durability, resistance, and pavement thickness through compressive, flexural, and tensile strength tests, as well as water and chloride penetration depth, water absorption, and XRD analysis. Results showed that adding micro-silica and bacteria significantly improved tensile, flexural, and compressive strengths. The MCB10 sample exhibited the highest flexural strength, while MCB12 demonstrated the greatest compressive strength and the lowest water and chloride penetration depths. Both MCB10 and MCB12 displayed superior resistance to freeze-thaw cycles and minimal water absorption. The pavement thickness of MCB10 increased by 18% compared to the control sample. A strong correlation (<i>R</i> = 0.99) was observed between flexural strength and water permeability depth, while an inverse relationship was noted between flexural strength and concrete slab thickness. These findings highlight the potential of micro-silica and microbial additives to enhance the performance and durability of concrete, making it a promising solution for sustainable construction practices.</p>

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Experimental study of bacterial self-healing of thermal micro-cracks in silica fume-enhanced concrete pavement

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Abolfazl Noori Shahr Abadi,
  • Gholamali Shafabakhsh,
  • Bita Bakhshi

摘要

Concrete is one of the most widely used building materials globally, but its durability and service life are often compromised by cracking, a common issue. Timely and effective repair of initial microcracks is essential to prevent their propagation, reduce maintenance costs, and extend the lifespan of concrete structures. An innovative and eco-friendly solution involves incorporating microorganisms and other suitable additives into the mix design, creating bio-concrete. This study aims to identify the optimal proportions of micro-silica and the ideal concentration of microbial species to enhance concrete performance and explore their application as repair agents for cracked concrete. The impact of adding microorganisms and micro-silica to concrete on mechanical strength and water permeability was thoroughly examined. Mix designs were developed with varying micro-silica percentages, Bacillus subtilis concentrations, and combinations of both, to investigate the self-healing properties of bacterial concrete. The study assessed concrete durability, resistance, and pavement thickness through compressive, flexural, and tensile strength tests, as well as water and chloride penetration depth, water absorption, and XRD analysis. Results showed that adding micro-silica and bacteria significantly improved tensile, flexural, and compressive strengths. The MCB10 sample exhibited the highest flexural strength, while MCB12 demonstrated the greatest compressive strength and the lowest water and chloride penetration depths. Both MCB10 and MCB12 displayed superior resistance to freeze-thaw cycles and minimal water absorption. The pavement thickness of MCB10 increased by 18% compared to the control sample. A strong correlation (R = 0.99) was observed between flexural strength and water permeability depth, while an inverse relationship was noted between flexural strength and concrete slab thickness. These findings highlight the potential of micro-silica and microbial additives to enhance the performance and durability of concrete, making it a promising solution for sustainable construction practices.