海外セメントの基礎物性および簡易品質評価手法に関する検討
本研究では海外で製造されたセメントの特徴と簡易な品質評価手法を検討するため、化学組成、鉱物組成を分析ののち、物理試験と水和発熱量測定を行い、物理特性と水和発熱量の相関について検討を加えた。その結果、石膏の種類、混合材の種類が異なる海外のセメントにおいて、初期の圧縮強さと総発熱量、圧縮強さ比とSiO2量の間には相関があることが明らかとなり、材齢初期の水和発熱量を測定することで、初期から長期のセメントの圧縮強さが予測できる可能性が示された。
Basic Property and Simple Method for Evaluating the Quality of Imported Cement
In this study, the authors clarified the characteristic features of imported cement and develop a simple method for evaluating the quality. First, the chemical composition and mineral composition was analyzed using x-ray fluorescence, x-ray diffraction, and others. Next, the heat of hydration was determined using a conduction calorimeter. Finally, the correlation between the strength and the heat of hydration was evaluated. The results show that imported cement contains different kinds of plasters and admixtures, such as lime stone, blast furnace slag, fly ash, and natural pozzolan. The results also show a clear correlation between the early strength and the early heat of hydration. The strength after 28 days and the quantity of SiO2 also correlated. Therefore, the early to long-term compressive strength of imported cement can be accurately estimated by measuring the heat of hydration at an early stage.