| Project/Area Number |
06650505
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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 |
土木材料・力学一般
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| Research Institution | WAKAYAMA NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
TOGAWA Kazuo WAKAYAMA NATIONAL COLLEGE OF TECHNOLOGY, DEPARTMENT OF CIVIL ENGINEERING,ASSOCIATE PROFESSOR, 環境都市工学科, 教授 (80043537)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMOTO Junji WAKAYAMA NATIONAL COLLEGE OF TECHNOLOGY, DEPARTMENT OF CIVIL ENGINEERING,PROFESS, 環境都市工学科, 助教授 (70043552)
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| Project Period (FY) |
1994 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Blast furnace slag / Slag content / Fineness of slag / Permeability / Hhydration / Durability / Shrinkage / Porosity / 置換率 / 粉末度 / 始発 / 終結 / ブリーディング / 水和 / 高炉スラグ微粉末 / 養生条件 / 強度特性 / クリープ / 凍結融解 / 強度発現 / 養生温度 / 超微粉砕スラグ / スラグ含有率 |
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| Research Abstract |
It is essential that concrete structures should withstand the conditions for which it has been designed over a period of years. The lack of durability may be caused either by the environment to which the concrete is exposed. This paper describes the results of an experimental study carried out on basic properties of high slag content concrete which has large amounts of ground granulated blast furncace slag (GGBS). The maximum replacement of slag is 95% by weight of the total cementitious materials, and the fineness of slag are 404 and 1670 m^2/kg. So many tests for strength development, heat evolution, drying shrinkage, creep, autogenous shrinkage, freezing and thawing resistance, chemical attack resistance, carbonation and water permeability were carried out on a large number of concrete specimens.
The following conclusions can be drawn from this study.
1. Drying shrinkage of HSC concrete was less than of slag free concrete, and increased with increasing slag content.
2. Utilization of GGBS into concrete mixture gave rise enlargement of progress rate of autogenous shrikage regardless of AE concrete and SP concrete.
3. Slag content and duration of preiminary water curing show the significant influence on the carbonation rate of HSC concrete.
4. The vulnerability of concrete to sulfate attack can be reduced by using of GGBS as an ingredient of cement.
5. The water tightness of HSC concretes could be improved by utilizing the high fineness slag within the range of 1200m^2/kg, and also could be improved remarkably by utilizing an air entraining and high range water redicing admixture.
6. The water permeability of HSC concretes were closely related to the porosity over the certain threshold value of diameter rather than to the meam diameter of pores.
7. HSC concrete could have satisfactory high resistance to freezing and thawing by using AEHW agent, even if the slag content was 95%..
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