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KMID : 1234420100380020216
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Korean Journal of Microbiololgy and Biotechnology
2010 Volume.38 No. 2 p.216 ~ p.221
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Application of Bacteria Isolated from Dok-do for Improving Compressive Strength and Crack Remediation of Cement-sand Mortar
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Park Sung-Jin
Lee Na-Young
Kim Wha-Jung
Kim Sa-Youl
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Abstract
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This study shows an application of microbiologically induced carbonate precipitate for strength improvement and crack remediation of cement-sand mortar. Seven calcium carbonate-forming bacteria (CFB) were isolated from Dok-do and partially identified by DNA sequence analysis of the 16s rRNA gene. Crystal aggregates were apparent around the bacterial colonies grown on an agar medium. These strains showed strain specific CaCO3 precipitation on urea-CaCl2 medium. Among 7 isolates, Arthrobacter nicotinovorans KNUC601, Microbacterium resistens KNUC602, Agrobacterium tumefaciens KNUC603, Exiguobacterium acetylicum KNUC604, and Bacillus thuringiensis KNUC606 showed a repairing of artificial forced cracks in cement-sand mortar. Compressive strength of cement-sand mortar consolidated with Stenotrophomonas maltophilia KNUC605 was increased around 14.07% compared with that of negative control.
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KEYWORD
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Dok-do, calcium carbonate-forming bacteria, mortar, compressive strength, crack remediation
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