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<p>Concrete durability is often compromised by the corrosion of embedded steel reinforcement due to crack formation. Recent developments in self-healing concrete offer a sustainable solution by enabling the repair of cracks through microbial activity. This study investigates the application of <i>Bacillus cohnii</i>, a less commonly explored bacterial strain, for enhancing the mechanical and durability properties of concrete. Different bacterial cell concentrations (10 to 10⁸ CFU/mL) were incorporated into the concrete mix. Experimental evaluations included compressive strength, split tensile strength, flexural strength, sorptivity, water absorption, Rapid Chloride Penetration Test (RCPT), and Ultrasonic Pulse Velocity (UPV) across multiple curing intervals. The results demonstrated up to a 24% improvement in compressive strength, a significant reduction in water absorption (by 31%), and enhanced resistance to chloride penetration. The Response Surface Methodology (RSM) was applied to optimize and model the combined effects of key parameters on concrete performance. This study presents a novel application of <i>Bacillus cohnii</i> for self-healing concrete and demonstrates its effectiveness in improving both mechanical strength and durability indicators, thereby contributing to the advancement of sustainable construction materials.</p>

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Optimizing concrete characteristics with Bacillus cohnii: an RSM-based study

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Shradha Jena,
  • Bidyadhar Basa,
  • Kishor Chandra Panda

摘要

Concrete durability is often compromised by the corrosion of embedded steel reinforcement due to crack formation. Recent developments in self-healing concrete offer a sustainable solution by enabling the repair of cracks through microbial activity. This study investigates the application of Bacillus cohnii, a less commonly explored bacterial strain, for enhancing the mechanical and durability properties of concrete. Different bacterial cell concentrations (10 to 10⁸ CFU/mL) were incorporated into the concrete mix. Experimental evaluations included compressive strength, split tensile strength, flexural strength, sorptivity, water absorption, Rapid Chloride Penetration Test (RCPT), and Ultrasonic Pulse Velocity (UPV) across multiple curing intervals. The results demonstrated up to a 24% improvement in compressive strength, a significant reduction in water absorption (by 31%), and enhanced resistance to chloride penetration. The Response Surface Methodology (RSM) was applied to optimize and model the combined effects of key parameters on concrete performance. This study presents a novel application of Bacillus cohnii for self-healing concrete and demonstrates its effectiveness in improving both mechanical strength and durability indicators, thereby contributing to the advancement of sustainable construction materials.