abstract |
A cement admixture containing calcium aluminate, wherein the chemical composition of the calcium aluminate is that in the total of CaO, Al 2 O 3 , SiO 2 , Fe 2 O 3 and TiO 2 , CaO is 21-27 parts by mass, Al 2 O 3 is 65-73 parts by mass, SiO 2 is 1-5 parts by mass, Fe 2 O 3 is 1-6 parts by mass, TiO 2 is 1-5 parts by mass, and the Blaine specific surface area value is 2,000-6,000 cm 2 /g. |