| Project/Area Number |
08455207
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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 |
土木材料・力学一般
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| Research Institution | Okayama University |
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Principal Investigator |
SAKATA Kenji Okayama University, Department of Environmental and Civil Engineering, Professor, 環境理工学部, 教授 (20093685)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥6,500,000 (Direct Cost: ¥6,500,000)
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| Keywords | Shrinkage / Creep / Temperature / Humidity / Temperature Historics / Curing Temperature / Season of Casting / Prediction Equation / 予測 / 予測手法 |
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| Research Abstract |
The effect of ambient temperature and humidity to which concrete is exposed prior to or during loading should be taken into account, when creep and shrinkage is predicted. Especially, in countries like Japan which have four seasons with significant variation in temperature, it is very important to predict the effect of ambient temperature on creep and shrinkage of concrete effectively and appropriately for design of concrete structures. The purpose of this study is to clarify the effects of environmental temperature and humidity changes on the creep and shrinkage of concrete. In this study, we carried out the creep and shrinkage tests under constant and varying histories of temperature and humidity. The creep and shrinkage tests corresponding to actual circumstance were also carried out in the room where the effect of rain and wind were negligible.
The effect of temperature history on shrinkage in much bigger than that of change in humidity. The shrinkage of concrete with increasing temperature history is much bigger than that in other temperature history. The magnitude of creep and shrinkage in highly influenced by the difference of the season in which concrete is cast. The effect of variance of humidity on creep seems to be small. Creep of concrete was much influenced by the temperature of curing water before application of load.
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