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Hydration activity of belite-rich cement, based on the heat evolution for up to ～10d, was effectively improved by a remelting reaction of the constituent belite. The modified cement, termed remelted belite cement, is mainly composed of belite in which the remelting reaction occurred for a large extent, and thus distinct from the conventional belite-rich cement. The liquid, exsolved by the reaction, contained a much higher concentration of alkalies than the host belite. The alkalies accelerated the hydration and the main heat evolution peak began ～7 h earlier during the initial stage up to ～30 h. The subsequent heat evolution between ～30 h and ～10 d was mainly increased by the presence of twin boundaries in the host β-phase belite ; the boundaries on the crystal surface behaved like active centers for the reaction with water. The grindability was also improved by the remelting reaction, in agreement with a previous study.
Acceleration of Early Hydration in Belite-Rich Cement by Remelting Reaction
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