| Project/Area Number |
18560448
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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 |
Civil engineering materials/Construction/Construction management
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| Research Institution | Niigata University |
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Principal Investigator |
SAEKI Tatsuhiko Niigata University, Institute of Science and Technology, Associate Professor (90215575)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,760,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | C-S-H / Ca / Si ratio / Fly ash / Blast furnace slag / Chloride ion / Diffusion / Fixation / Carbonation |
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| Research Abstract |
The purpose of this study is to estimate the concrete performances using the properties of hydration products independent of the kind of materials and mix proportions of concrete. Synthesized C-S-H with various Ca/Si molar ration and Fly ash and Blast furnace slag were used in the experiments. The details and results of the research are as follows
1. A hydration model for blended cement(Fly ash cement and Blast furnace slag cement)was developed. The amount of calcium hydroxide and C-S-H and the Ca/Si molar ratio of hardened cement paste can be predicted by the hydration model.
2. Effects of the Ca/Si molar ratio of the synthesized C-S-H on its density, specific surface area and the characteristic of chloride fixation were investigated. The effect of carbonation on chloride fixation was also studied.
3. Concrete properties, such as diffusion coefficient of ions, chloride binding capacity, are explained by from the view point of Ca/Si ratio of C-S-H. Therefore, the durability of concrete can be evaluated qualitatively by chemical composition of C-S-H.
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