Process for manufacturing concrete articles of improved initial strength and long-term strength

摘要

A process for manufacturing concrete articles of improved initial strength and long-term strength from a hydraulic cement composition capable of forming predominantly tobermorite group crystalline calcium silicate hydrate is provided. The hydraulic cement composition, having incorporated therein specified amounts of alumina cement and calcium hydroxide and/or oxide, is initially set in a mold and after the concrete so formed is allowed to stand at a temperature of not higher than approximately 40 DEG C for a period of 2 hours to 5 days, the concrete is finally cured at an elevated temperature and pressure.