该水泥复合材料中含有50～95重量份数的氧化铝水泥(含Al_2O_3的重量≥45％)和5—50重量份数的氧化镁。该水泥复合材料中还含有水溶性的聚甲基丙烯酸或其盐0.1—3％和/或羟基羧酸、羟基羧酸盐或无机碳酸盐0.1一2%(以水泥为100计)。这种水泥复合材料具有高耐火性、硬化后具有高机械强度、并且不发生硬化阻滞、并且有 The cement composite material contains 50 to 95 parts by weight of alumina cement (containing Al45% by weight of Al 2 O 3 ) and 5 to 50 parts by weight of magnesium oxide. The cement composite material also contains water-soluble polymethacrylic acid or salts thereof 0.1 to 3% and/or hydroxycarboxylic acid, hydroxycarboxylate or inorganic carbonate 0.1 to 2% (calculated as cement 100). This cement composite material has high fire resistance, has high mechanical strength after hardening, and does not undergo hardening retardation and has