| Project/Area Number |
02650392
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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 |
Building structures/materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KOIKE Michio Tokyo Institute of Technology, Research Laboratory of engineering materials, Professor, 工業材料研究所, 教授 (40001143)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIDA Hiroshi Tokyo Institute of Technology, Research Laboratory of engineering materials, Ass, 工業材料研究所, 助手 (20175532)
TANAKA Kyoji Tokyo Institute of Technology, Research Laboratory of engineering materials, Ass, 工業材料研究所, 助教授 (40016829)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1991: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Concrete surface / Finish / Delamination / Pore structure / Moisture / Bond / はく離 / ふくれ / 細孔空げき |
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| Research Abstract |
The following knowledge may be drawn from the experimental investigations on the surface characteristics of concrete substrate relating to the delamination of finishing layers applied on it.
Concrete with a high water/cement ratio or at an early age has a lot of large capillary pores and a high water permeability, which are the potential characteristics to damage the bond layer and to delaminate the finishes. Dense and dry concrete surface is consequently required to maintain the good performance of the finishes. If the bond component induces the osmotic pressure, however, dense concrete may be not always good for the finishes because the water movement is also accelerated by the narrow pores which may be expected to act as a semi-permeable membrane.
Pore structure of concrete surface is influenced by water/cement ratio and curing condition. As for concrete slabs, the moist curing at early age is of great importance for the pore structure densification. In spite of a later age, larger vacant pores remain in concrete surface when the surface is dried from the early age such as a few days.
It is important to take such concrete surface characteristics and mechanism of water movement into account for investigation on the delamination of finishes.
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