| Project/Area Number |
24656317
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Building structures/materials
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| Research Institution | Hokkaido University |
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Principal Investigator |
NAWA Toyoharu 北海道大学, 工学(系)研究科(研究院), 教授 (30292056)
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| Co-Investigator(Kenkyū-buntansha) |
KURUMISAWA Kiyofumi 北海道大学, 大学院工学研究院, 准教授 (40374574)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 高速・超高感度XRD / C3A / C3S / 初期水和解析 / NMR / 相平衡モデル / 流動性 / 許容最大廃棄物添加量 / 29Si-NMR / ナフタレンスルホン酸縁塩 / メタクリル酸塩 / 硫酸塩 / リートベルト法 / ごく初期水和反応 / 非晶質C-A-H / C-A-S-H |
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| Research Abstract |
When industrial waste is utilized as the raw material for cement, C3A, which is a mineral of four major constitutes of cement increases because the industrial waste condenses high amount of aluminum. In this study, the hydration behavior of C3A, of which hydration rate is very fast, was in- vestigated by using a high-speed, ultra-sensitive XRD in combination of amorphous phase analysis with 27Al MAS NMR, and elucidated the reaction mechanism of C3A in more detail using thermodynamic phase equilibri-um and surface complexation models. The change in properties of C-S-H formed by the hydration reaction of C3S with the increase of Al content in the cement was also analyzed by using 29Si MAS NMR. In addition, the influence of increase of C3A content on the fluidity of cement paste was also investigated to evaluate the limitation of industrial waste usage in cement production.
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