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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Remediation of Concrete Using Microorganisms
Author(s): Santhosh K. Ramachandran, V. Ramakrishnan, and Sookie S. Bang
Publication: Materials Journal
Appears on pages(s): 3-9
Keywords: calcite; compressive strength; cracking; stiffness
Abstract:This paper describes an innovative biotechnology utilizing microbiologically-induced mineral precipitation for concrete remediation. Calcite precipitation induced by Bacillus pasteurii was studied in two types of portland cement mortar specimens: one prepared from mixing with microorganisms, and the other with simulated cracks filled with microbial mixtures. The study showed that there was a significant increase in compressive strength of the portland cement mortar cubes containing lower concentrations of live cells. Compressive strengths of the cubes containing live or dead cell mass, however, decreased as cell concentrations and curing time increased, suggesting the interference of mortar integrity by biomass. Cracks filled with bacteria and sand demonstrated a significant increase in compressive strength and stiffness values when compared with those without cells. Scanning electron micrographs identified that microbiological calcite precipitation occurred mainly close to the surface areas of the crack, where a dense growth of calcite crystals embedded with cells was observed.
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