2012 Fiscal Year Final Research Report
Applicability of cathodic protection to reinforced concrete subjected to chloride induced deterioration and ASR
| Project/Area Number |
22560462
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Tottori University |
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Principal Investigator |
KURODA Tamotsu 鳥取大学, 大学院・工学研究科, 准教授 (30263487)
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| Project Period (FY) |
2010 – 2012
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| Keywords | コンクリート / 耐久性 / アルカリシリカ反応 / 塩害 / 電気防食工法 |
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| Research Abstract |
Investigation of the effects of electrical current applied to reinforced concrete on alkali content distribution and ASR expansion produced the following results. (1) An increase in the current density in the specimen was accompanied by an increase in the concentration of alkaline metal ions around the reinforcing steel, and the amount of ion migration is considered to depend on the cumulative current density. (2) The current promoted ASR expansion. The dependence of the pessimum value on the current density was also confirmed. (3) A current density of about 5 mA/m2was not found to promote ASR expansion to a large degree. (4) ASR expansion can be expressed as a function in terms of the current density and current duration. (5) By supplying a large current densities(1A/m2, 2A/m2) before application of the cathodic protection, ASR expansion during application of the cathodic protection could be restrained.
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