| abstract |
(57) [Problem] To provide a cement quick setting agent and a cement composition used in the civil engineering and construction industries, which have effects such as obtaining a cement composition excellent in quick setting properties. SOLUTION: 3CaO ยท A having a Blaine specific surface area value of 5,500 cm 2 / g or more and a CaO / Al 2 O 3 molar ratio of 2.5 to 4.5. CaO-Al 2 O 3 based Cook 50-95 parts 5-50 parts alkali carbonate composed mainly of l 2 O 3, also the CaO-Al 2 O 3 based Cook 5 0 to 95 parts, 5 to 50 parts of an alkali carbonate, and 20 parts or less of an alkali metal aluminate, a cement quick setting agent, CaO- The cement quick-setting agent, in which the Al 2 O 3 heat-treated material has a Blaine specific surface area value of 6,000 cm 2 / g or more, and a cement composition containing cement and the cement quick-setting agent. |