| abstract |
[PROBLEMS] In addition to fluidity, prevention of bleeding, ensuring sufficient pot life, initial strength development at low temperatures, improvement of settlement phenomenon before curing, crack resistance when placed in a dry state, etc. An ultrafast cement composition, an ultrafast mortar composition, and an ultrafast grout mortar exhibiting the following effects are provided. Portland cement, amorphous calcium aluminate having a CaO / Al 2 O 3 molar ratio of 1.25 to 1.75, anhydrous gypsum, an alkali metal aluminate, a setting regulator, and a gas A super-fast-hardening cement composition containing a foaming substance. The ignition loss of the amorphous calcium aluminate is preferably 0.3 to 2%. Furthermore, the super-fast-hard mortar composition which mix | blended the most aggregate with the super-fast-hardening cement composition and the super-fast-hard grouting mortar which added water to this are comprised. [Selection figure] None |