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KMID : 0545120170270071331
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Journal of Microbiology and Biotechnology
2017 Volume.27 No. 7 p.1331 ~ p.1335
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Biocementation of Concrete Pavements Using Microbially Induced Calcite Precipitation
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Jeong Jin-Hoon
Jo Yoon-Soo
Park Chang-Seon
Kang Chang-Ho
So Jae-Seong
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Abstract
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In this study, the feasibility of introducing calcite-forming bacteria into concrete pavements to improve their mechanical performance was investigated. Lysinibacillus sphaericus WJ-8, which was isolated in a previous study and is capable of exhibiting high urease activity and calcite production, was used. When analyzed via scanning electron microscopy (SEM) and X-ray diffraction, WJ-8 showed a significant amount of calcite precipitation. The compressive strength of cement mortar mixed with WJ-8 cells and nutrient medium (urea with calcium lactate) increased by 10% compared with that of the controls. Energy dispersive x-ray spectroscopy analyses confirmed that the increase in strength was due to the calcite formed by the WJ-8 cells.
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KEYWORD
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Microbially induced calcite precipitation, concrete pavement, calcite-forming bacteria, cement mortar
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