CRYSTALLINE HIGHLY HYDRATED AND ACTIVATED MATERIAL HARDENING ACCELERATING MATERIAL FOR CEMENT AND ACCELERATION OF SETTING AND HARDENING OF MORTAR OR CONCRETE

摘要

PROBLEM TO BE SOLVED: To obtain an admixture for various kinds of cements capable of remarkably accelerating the setting and hardening of a cement paste, a mortar, a concrete, etc., by blending it in a prescribed amount and stably providing a high initial strength even at normal temperatures or under low-temperature environments in a short time. ;SOLUTION: This crystalline highly hydrated and activated material containing C₂A₃.CaSO₄, C₄AF, C₃A, C₁₂A₇ and C₁₁A₇.CaF₂ is obtained by baking a CaO-Al₂O₃-Fe₂O₃-SO₃-CaF₂-based composition at 1000-1400°C temperature. The resultant material is then suitably mixed with a gypsum, lime, an alkali carbonate, sodium aluminate, an alkali sulfate and aluminum hydroxide, etc., to provide a hardening accelerator for cements.;COPYRIGHT: (C)1997,JPO