HYDRATION ANALYSIS AND PHASE COMPOSITION OF CEMENT-BASED MATERIALS BY X-RAY DIFFRACTION/RIETVELD METHOD USING AN EXTERNAL STANDARD

This research focuses on the hydration analysis of ordinary Portland cement（OPC）and Portland cement-blast furnace slag（BFS）system by X-ray diffraction/Rietveld method using an external standard. Degree of hydration of cement compounds and BFS, amount of hydration products and amorphous were determined quantitatively by X-ray diffraction/Rietveld analysis using external and internal standard. In addition, relationships between the hydration reaction of OPC and OPC-BFS system and the microstructural evolution were studied. From the results of this study, following conclusion was obtained. Degree of hydration of cement compounds and BFS, amount of hydration products and amorphous determined by X-ray diffraction/Rietveld analysis using external and internal standard were almost the same results. Hydration of OPC-BFS system showed nonlinear behavior of development for gel water with hydrate precipitate, C-S-H produced from BFS hydration at later age had larger amount of gel water. The capillary pore volume of OPC-BFS system was larger in lower region of hydration degree, and remarkably decreased as hydration progressed.本研究では、X線回折/リートベルト解析の外部標準法を用い、普通ポルトランドセメント（OPC）および高炉セメント（BB）硬化体中のセメント鉱物やスラグ反応率、水和生成物量を測定した。比較として内部標準法についても同様の測定を行った。その結果、両手法により求めたセメント鉱物やスラグ反応率、水和生成物量の値は概ね一致した。さらに、OPCおよびBBの水和反応と硬化体の微細構造形成との関係について検討し、BBの生成するC-S-Hに内包するゲル空隙は水和後期において増加することで、効率的に毛管空隙が減少することが明らかとなった。