アルミネート相およびフェライト相の水和反応に関する研究: ボルトランドセメントの水和機構に関する研究　その2

摘要

近年，セメントの水和反応からコンクリート，あるいは鉄筋コンクリート部材や構造物全体の性能を予測する試みが行われている1）。この時間依存性の問題において，外部環境とコンクリート中で生じている変化の相互依存性の中核となるのが，いわゆる水和反応モデルである。%Hydration process of many kinds of cement paste is investigated by powder X-ray diffraction (XKD)/Rietveld analysis. The parameters of the present study are type of cement (Ordinary Portland cement, Low heat cement, and Eco-cement), water to cement ratio (0.50, 0.35), and curing temperature (283,293, 313K). In this contribution, reaction of aluminate phase (SCaOAl_2O_3) and ferrite phase (4CaOAl_2O_3-Fe_2O_3) are focused and evaluated. Experimental results show that the reaction of both aluminate phase and ferrite phase are affected by the temperature and presence of calcite. When system includes calcite, monocarbonate aluminate is mainly produced, rather than ettringite. And in the case of high curing temperature, Al_2O_3 is reacted as amorphous. Regarding ferrite phase, the reaction degree at the age of 1 year decrease as curing temperature increases, this can be presumed due to dense amorphous phase around cement minerals. Based on these experimental fects, simple hydration model is proposed to evaluate development of hydration degree of aluminate phase and ferrite phase.