abstract |
(57) [Summary] [Problem] Having good workability and early strength, PROBLEM TO BE SOLVED: To provide a cement composition having a short demolding time and its concrete and concrete products. A predetermined amount of a pulverized clinker composition containing interstitial material and, if necessary, alite and belite, containing 50 to 92% by weight of CaO crystals is added to Portland cement or mixed cement. High-strength cement, and its concrete and concrete products. |