2013 Fiscal Year Final Research Report
Experiments on choloride deterioration in concrete specimen modelled like piers in bridges
| Project/Area Number |
24760353
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Tomakomai National College of Technology |
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Principal Investigator |
WATANABE Akio 苫小牧工業高等専門学校, その他部局等, 准教授 (00422650)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | コンクリートの塩害 / 凍結防止剤 / 塩化物イオン濃度 |
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| Research Abstract |
Many bridge substructures are damaged by de-icing salt in Japan Expressways. This experimental study focuses on the water leakage from bridge expansion joint and the penetration of chloride ion at the bridge substructures. We prepare a concrete specimen(W/C 55%) and 3.5% salt water pour on the concrete specimen. A specimen is wet by salt for one day and dry for another six days, we continue this process twelve times.
As a result of this experiment, the dense of salt is measured at bound of wet surface. This phenomenon describes that salt water moves from the boundary part to the dried part by capillary action. Some of the salt water disappear into thin air by evaporation phenomenon. Therefore, it is predictable that the water is concentrated from salt density point of view, that is, only salt remains.
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