Document Type : Research Paper
Authors
1
PhD Candidate of Raod and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I.R. Iran.
2
Professor, Department of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I.R. Iran.
3
Professor Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Abstract
Cracks are one of the main causes of concrete failure, facilitating the penetration of chemical solutions and negatively impacting the characteristics of concrete structures. To address this problem, various methods such as coatings and adhesives have been used. However, due to the high costs and issues like peeling, attention has shifted toward alternative methods, including self-healing concrete. One of these methods involves the use of microorganisms to repair cracks. In this study, Bacillus subtilis bacteria were used, which, unlike other bacteria, do not require microcapsules or nanomaterials, making it less expensive to produce. The use of this bacteria has significantly improved the compressive, flexural, and tensile strength of the concrete. The RB10 and RB12 samples showed the highest strength increases, with RB10 exhibiting a 100% increase in flexural strength and 76.5% in compressive strength. Additionally, the tensile strength of the concrete increased by up to 15% with the use of this bacteria.
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