Optimization of growth medium for <Emphasis Type="Italic">Sporosarcina pasteurii</Emphasis> in bio-based cement pastes to mitigate delay in hydration kinetics |
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Authors: | Sarah L Williams Mary Jo Kirisits Raissa Douglas Ferron |
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Institution: | 1.Department of Civil, Architectural, and Environmental Engineering,University of Texas at Austin,Austin,USA |
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Abstract: | Microbial-induced calcium carbonate precipitation has been identified as a novel method to improve durability and remediate cracks in concrete. One way to introduce microorganisms to concrete is by replacing the mixing water with a bacterial culture in nutrient medium. In the literature, yeast extract often has been used as a carbon source for this application; however, severe retardation of hydration kinetics has been observed when yeast extract is added to cement. This study investigates the suitability of alternative carbon sources to replace yeast extract for microbial-induced calcium carbonate precipitation in cement-based materials. A combination of meat extract and sodium acetate was identified as a suitable replacement in growth medium for Sporosarcina pasteurii; this alternative growth medium reduced retardation by 75 % (as compared to yeast extract) without compromising bacterial growth, urea hydrolysis, cell zeta potential, and ability to promote calcium carbonate formation. |
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