| abstract |
(57) [Abstract] [Object] The present invention significantly accelerates the setting and hardening of cement paste, mortar, concrete, etc. by mixing a predetermined amount with cement, and moreover, high initial strength can be stably obtained in a short time. To provide such cement admixtures and to use them to accelerate the hardening of concrete or mortar. [Configuration] The present invention, calcium monkey follower aluminate obtained by firing the CaO over Al 2 O 3 over SO 3 based composition and (3CaO · 3Al 2 O 3 · CaSO 4) 3CaO ・ Al 2 O 3 , CaO ・ Al 2 O 3 , 12CaO ・ 7A A crystalline highly hydrated active consisting of a cement mineral of calcium aluminate such as l 2 O 3 . |