amp;gamma;-BELITE-CONTAINING CEMENT-BASED MATERIAL WITH IMPROVED CARBONATION POTENTIAL IN ACTUAL ENVIRONMENT

摘要

PROBLEM TO BE SOLVED: To provide a γ-belite-containing cement-based material capable of being carbonated in a natural environment of high humidity.;SOLUTION: The cement-based material with improved carbonation potential in an actual environment is manufactured by impregnating a hardened body of a cement mixture containing 10-85 pts.mass of γ-belite vs. 100 pts.mass of cement with a silicone-based water-repellent material from its surface to form a water-repellent surface layer with an average thickness of 5-20 mm. A mixture with a water/powder ratio of 20-50% is preferable. As the silicone-based water-repellent material, an emulsion containing an alkylalkoxysilane of 10-50 pts.mass vs. a polyorganosiloxane of 1 pt.mass, where the total content of the polyorganosiloxane and the alkylalkoxysilane is controlled to be 60-90 mass%, is usable.;COPYRIGHT: (C)2007,JPO&INPIT