C-S-Hの組成がゲル空隙の量およびゲル空隙の空隙径分布に及ぼす影響  [in Japanese] EFFECT OF CHEMICAL COMPOSITION OF C-S-H ON VOLUME AND PORE SIZE DISTRIBUTION OF GEL PORE  [in Japanese]

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Abstract

本研究は,セメント硬化体の中で主要な水和物であるC-S-Hが保有しているゲル空隙に対し,その組成変化が及ぼす影響を明らかにすることを目的として検討を行った.<br> 本研究では,C-S-Hのゲル空隙について検討するため,エーライト水和試料の水蒸気吸着等温線に着目し,水和物(C-S-H)が保有している水分と毛細管空隙中の水分を分離した.<br> 次に,得られたC-S-Hの水蒸気吸着等温線より,C-S-Hの保有するゲル空隙の量や空隙径分布に対してC-S-Hの組成が及ぼす影響について検討を行い,C-S-Hの組成とゲル空隙の関係を明らかにした.その結果,その組成変化を考慮することでC-S-Hのゲル空隙の量や空隙径分布を推定する方法を提案した.

 C-S-H is a dominant hydration product of cementitious materials. Therefore, its chemical composition and physical properties affect the properties of concrete. With regard to the pore structure of C-S-H, it is known that the gel pore volume of C-S-H is 28% and the gel pore size is about 2nm. However, the gel pore of C-S-H generated from various materials, such as cement, blast furnace slag, fly ash and silica fume have not been completely clarify. Therefore, the purpose of this study is to estimate chemical composition and gel pore of C-S-H, such as pore volume and pore size distribution.<br> From the experimental results, The gel pore volume of C-S-H was affected by the C/S ratio. Based on the composition of C-S-H, the inversely relationship between the gel volume and the C/S ratio of C-S-H was clarified. And, it was clarified that the gel pore size distribution of C-S-H was not influenced by the change of the C/S ratio from these results.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 70(2), 134-152, 2014

    Japan Society of Civil Engineers

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