| abstract |
(57) [Summary] [PROBLEMS] Compared to conventional products, temperature dependence is extremely low. To provide an alumina cement composition having an excellent water reducing effect, fluidity, and strength, and having an appropriate pot life, and an amorphous refractory using the same. A CA20~80 parts, CA 2 5 to 50 parts, and C 12 A 7 1 Alumina cement composition containing 2020 parts of an alumina cement containing a mineral composition and an admixture having a specific structural unit, and a BET having an average particle size of 1 to 10 μm. The specific surface area is 0.1 to 2 m 2 / g, and the vitrification rate is 5 The alumina cement composition using 0% or less of the alumina cement, the alumina cement composition and the refractory aggregate, and the amorphous refractory containing ultrafine powder. |