水蒸気吸着によるC-S-HのBET比表面積とC-S-Hが有する反応基との相関に関する基礎的考察  [in Japanese] RELATIONSHIP BETWEEN SPECIFIC SURFACE AREA OF C-S-H BY VAPOR ADRORPTION ISOTHERM AND SILANOL GROUP ON THE SURFACE OF C-S-H  [in Japanese]

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Author(s)

    • 五十嵐 豪 IGARASHI Go
    • 名古屋大学 大学院環境学研究科都市環境学専攻 NAGOYA UNIVERSITY, Graduate School of Environmental Studies
    • 丸山 一平 MARUYAMA Ippei
    • 名古屋大学 大学院環境学研究科都市環境学専攻 NAGOYA UNIVERSITY, Graduate School of Environmental Studies

Abstract

合成したC-S-Hに関して、Ca/Siモル比の変化に伴う水蒸気吸着性状の変化について検討を行った。水蒸気吸着等温試験および熱分析により、C-S-Hの水蒸気吸着性状に関する実験値を取得し、Nonatらが提唱しているC-S-H溶解平衡モデルを基とした構造モデルおよび水蒸気吸着モデルを提案し、水蒸気吸着BET比表面積の予測を試みた。その結果、Ca/Siモル比の変化に伴う比表面積の変化をC-S-H表面の反応基の変化に基づき予測できるモデルが構築された。

It is known that the evaluation of volume change of hardened cement paste is controlled the hydration force, which derived from the potential of hydroxyl group. And then, for the evaluation of volume change due to hardened cement paste drying, specific surface area of calcium silicate hydrate in the hardened cement paste, which affects statistical adsorption vapor thickness in the hardened cement paste, is focused. The synthesized calcium silicate hydrate(synthesized C-S-H), which calcium to silicate molar ratio is 0.9, 1.1, 1.3, 1.5, is prepared. The specific surface area of each C-S-H, which pre-treated under degased and each temperature(30degC, 105degC, 150degC), is measured by 20degC vapor adsorption isotherm and B.E.T theory. The H<sub>2</sub>O/Si molar ratio of each C-S-H, which humidificated under each relative humidity(0%RH, 60%RH, 95%RH), are measured by Thermal Gravity Analysis. Based on thermodynamic model of silanol group on the C-S-H by Nonat, the unit model of C-S-H, which has four silanol group(two variable -SiOH, a -SiOH, a -SiOCaOH) is proposed. the number of water molecule, which adsorbs on each silanol groups, is identified and the specific surface area model of C-S-H in adsorption process are proposed. The proposed model can predict the specific surface area of various C-S-H, which has various Ca/Si molar ratio or pretreated each temperature drying condition.

Journal

  • Cement Science and Concrete Technology

    Cement Science and Concrete Technology 65(1), 140-145, 2011

    Japan Cement Association

Codes

  • NII Article ID (NAID)
    130004745668
  • Text Lang
    JPN
  • ISSN
    0916-3182
  • Data Source
    J-STAGE 
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