HEALTH CERTIFICATE FOR HIGH-TEMPERATURE HIGH-PRESSURE WATER CONDITIONS AND PROCEDURES FOR EXHAUSTING HEALTH CERTIFICATE

摘要

Method of manufacturing high strength chemically prestressed concrete molding products with great amount of introduced chemical prestress and smaller loss of the same, a high temperature high pressure underwater curing apparatus concrete molding products excellent in energy efficiency, productivity and safety by re-utilizing curing water, as well as a curing method thereof are provided. Concretes formed by kneading a cement composition containing cement and expansive additive is molded and cured in curing water at high temperature exceeding 100 DEG C to manufacture chemically prestressed concrete molding products. The curing apparatus comprises a plurality of pressure resistant vessels 4A and 4B. Each of the pressure resistant vessels comprises a curing water supply device 6, a pressurized supply device 8, a heater 12 and a deaeration device 10. Transfer pipes 16A and 16B communicating with other vessel for high temperature high pressure water are disposed to the lower portion thereof, thus the vessels are connected to each other via the transfer pipes so as to form a circulation channel. The curing water just after the completion of curing is transferred successively to the other pressure resistant vessels during stand-by state at an atmospheric pressure by utilizing a high pressure in the pressure resistant vessel and used repeatedly. IMAGE