2016 Fiscal Year Final Research Report
Clarification of mechanism of re-deterioration caused in RC after repair and application to maintenance management system
| Project/Area Number |
26289137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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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 | Kanazawa Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
高橋 良輔 山梨大学, 総合研究部, 准教授 (10371783)
田中 泰司 東京大学, 生産技術研究所, 准教授 (40377221)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 鉄筋コンクリート / プレストレストコンクリート / 表面含浸工法 / 断面修復工法 / 再劣化 / 遮水性 / 遮塩性 / 力学性能 |
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| Outline of Final Research Achievements |
The effect of the repair with silane-type surface penetrant material under an environment of ultraviolet rays was investigated. A low water permeability was kept for 20 years. On the other hand, a low chloride permeability was kept for 10 years but decreased at 20th year. However, it could be recovered by second application.
Secondly, it is easy to adsorb chloride ions on a formwork plane compared with a cut plane. However, the difference decreased in a concrete with high strength.
Further, when PC beams repaired a section, a step-by-step restoration distributed the pre-stress to several-time. Therefore, the pre-stress did not decrease when a section was cut down. As a result, the load of the stress increment of the existing concrete decreased, and the crack occurrence load of the repair part became large.
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| Free Research Field |
コンクリート工学
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