Relationship between structural change and volume change of C-S-H during drying process
| Project/Area Number |
16H06105
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Building structures/Materials
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| Research Institution | The University of Tokyo (2019)
Tohoku University (2016-2018) |
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Principal Investigator |
Igarashi Go 東京大学, 大学院工学系研究科(工学部), 特任講師 (10733107)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2017: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2016: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Keywords | C-S-H / 乾燥収縮 / 水分特性 / 層間水 / ゲル水 / 吸着理論 / スリット空隙 / 処女乾燥 / セメント化学 / 層状構造 / 収縮低減 / 1H-NMR / 混和材 / 収縮提言 |
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| Outline of Final Research Achievements |
The first desorption isotherms (relationship between humidity and water content) of the cement paste, which cured under water at various temperatures were obtained and they were analysed based on the adsorption theory, which is called the extended BET theory. As a result, assuming that the void shape of the cement paste is a slit, the slit width is only 6 layers of water molecules. Furthermore, the saturation degree in the slit void is almost the same at high humidity regardless of temperature, but it is lower as the temperature decrease at low humidity.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の学術的意義は，これまでのセメント化学において定説化しつつあった毛管張力による乾燥収縮メカニズムではなく，新たにC-S-Hの層状構造の層間に生じる分離圧による乾燥収縮メカニズムによる可能性を示したことにある。これは，社会的意義からとらえると，無収縮コンクリートといった新材料開発への基礎的な知見となったことや，現在すでにストックとして存在する高経年化したコンクリートの性能評価手法の構築への基礎的な知見となったと考えられる。
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Report
(5 results)
Research Products
(10 results)
