1994 Fiscal Year Final Research Report Summary
Mechanism of concrete deterioration caused by micro organisms
| Project/Area Number |
05805067
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
生物・生体工学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
MORINAGA Tsutomu Hirosima Univ, Faculty of Engineering, Assistant Prof., 工学部, 助教授 (40034417)
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| Co-Investigator(Kenkyū-buntansha) |
TAZAWA Eiichi Hirosima Univ, Faculty of Engineering, Prof., 工学部, 教授 (60155067)
MUROOKA Yoshikastu Hirosima Univ, Faculty of Engineering, Prof., 工学部, 教授 (60029882)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Microorganisms / Concrete / Deterioration |
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| Research Abstract |
A certain undergroud concrete structure had been severely damaged, and the cause was belived to have been metabolites prorduced by microorganisms. In this study, several types of bacteria in the soil around the structure were isolated and cultured under aerobic conditions. Mortar simulation tests using the bacteria were then carried out and the composition of the metabolites produced by the bacteria analyzed. As a result, calcium ion was dissolved out from mortar soaked in the culture medium bred with the bacteria, and it was found that organic acids and carbonic acid were metabolized by the bacteria. It is already known that concrete can be severely damaged by anaerobic bacteria, but this study suggests that organic acids and carbonic acid metabolized by aerobic bacteria can also cause concrete to deterirate.
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