2013 Fiscal Year Final Research Report
Effect of interface-treatment for the unity and reliability on the interface between existing concrete and repair materials
| Project/Area Number |
22360173
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Tokyo Metropolitan University |
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Principal Investigator |
UJI KIMITAKA 首都大学東京, 都市環境科学研究科, 教授 (70326015)
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| Co-Investigator(Renkei-kenkyūsha) |
UENO Atsushi 首都大学東京, 都市環境科学研究科, 准教授 (50232765)
OHNO Kentaro 首都大学東京, 都市環境科学研究科, 助教 (80571918)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | コンクリート |
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| Research Abstract |
The shear capacity in existing RC beams increases by attaching the carbon fiber reinforced plastic (CFRP) grids and the polymer cement mortar (PCM) to side areas of base concrete beams.
In this study, the relation between shear bond strength and roughness, the shift of shear resisting area and the effect of strengthening of beam using CFRP were investigated. Shear bond strength was directly proportional to the degree of surface roughness. The pull-out tests of element specimens were conducted, to investigate shear bond behavior between existing concrete and sprayed PCM with a CFRP grid. From the experimental results and numerical analysis results, it was clarified that the bearing areas of shear bond stress shift from bottom of the specimen which is near the loading point to upper part of the specimen. Also, it was confirmed that the combination of sprayed PCM and CFRP were effective for strengthening existing reinforced concrete beams.
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[Remarks] 宇治公隆, コンクリート構造物の長寿命化における課題, 日刊工業新聞,11月29日号 ,pp.14-15, 2012
