SPring-8放射光X線回折法によるEVAエマルション中のアルミナセメントの水和過程

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概要

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• Polymer-modified mortars which consist of a polymer emulsion and cement materials have been widely developed in the construction materials fields. Forming process of the polymer-modified cement membrane simultaneously involves evaporation of water within the polymer emulsion and hydration of cement. It is important for the polymer-modified cement paste that the hydrate crystal of cement is generating by the hydration during the setting process under existence of the polymer emulsion. In this study, hydration process for calcium-aluminate cement under existence of poly (ethylene-vinyl acetate) (EVA) emulsion (polymer-cement ratio = 100%) was investigated by X-ray diffraction method using synchrotron radiation (SPring-8). The diffraction peaks of calcium aluminate (CA) disappeared after the hardening, on the other hand, the peaks of hydrate crystals of calcium-aluminate cement (C_2AH_8 and C_3AH_6) could be observed. This polymer-modified cement paste hydrated using the water within the polymer emulsion. The hydration of C_2AH_8 from CA started at around 300min, and then C_3AH_6 hydrate crystal increased after 700min at ambient temperature. This implies that the conversion from C_2AH_8 to C_3AH_6 occurred to be more stable phase. The setting temperature affected the reaction rate. In case of hydration at 35℃, the start time of the hydration for calcium-aluminate cement was quicker than that in the ambient temperature four or more times.

• 社団法人日本材料学会の論文
• 2005-07-15

著者

• 小寺 賢

  (財)高輝度光科学研究センター 産業応用利用支援グループ

• 小寺 賢

  (財)高輝度光科学研究センター

• 松田 幾代

  (株)大関化学研究所

• 宮下 景子

  (株)大関化学研究所

• 足立 伸幸

  (株)大関化学研究所

• 田村 久幸

  (株)大関化学工業

関連論文

• SPring-8放射光X線回折法によるEVAエマルション中のアルミナセメントの水和過程
• 放射光
• 放射光 (特集 接着に関する分析評価技術(1)表面分析)
• SPring-8放射光で眺める高分子の構造

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