Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack- A Review
Publish place: Journal of Chemical Reviews، Vol: 1، Issue: 4
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JCHM-1-4_005
تاریخ نمایه سازی: 17 آذر 1398
Abstract:
Deleterious ions in the environment such as sulfates may degrade the concrete structures. The interaction of cement hydration products with these destructive agents contributes to severe durability threat of the concrete structures. External sulfate attack is well-known for causing permanent changes in concrete. Microbially induced calcium carbonate (MICP) precipitation has been considered as a unique technique in enhancing the durability properties of concrete. This review paper discusses the possibility of bio-deposition from MICP process as a barrier in microbial treated concrete against the penetration of sulfate ions in a sulfate- rich environment. The effect associated with chemical and physical sulfate attack is discussed in line with the mechanical properties of cement such as compressive strength whereas microscopic evaluation is based on scanning electron microscopy studies. The shortcomings associated with sulfate ions in cement-based materials and the positive effects of incorporating bacillus species bacteria in sulfate rich areas is discussed. This review found that, MICP can significantly reduce the ingress of sulfate ions in cement-based materials, which results in improving the mechanical properties of the cement mortar/concrete.
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Authors
Onesmus Mulwa Munyao
Department of Chemistry, School of Pure and Applied Sciences, Kenyatta University, Nairobi, Kenya
Joseph Karanja Thiong o
Department of Chemistry, School of Pure and Applied Sciences, Kenyatta University, Nairobi, Kenya
Jackson Muthengia Wachira
Department of Physical Sciences, University of Embu, Embu, Kenya
Daniel Karanja Mutitu
Department of Physical Sciences, University of Embu, Embu, Kenya
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