EARLY-STRENGTH ADMIXTURE FOR SECONDARY PRODUCT AND EARLY-STRENGTH CONCRETE FOR SECONDARY PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide an early-strength admixture which secures a pot life necessary for a work in any one of ordinary temperature and high temperature range ready for curing with steam, and then can achieve early-strength development of approximately 7.5 N/mm² or more in an early period of 3-4 hours.;SOLUTION: An early-strength admixture for secondary product contains alumina cement, anhydrous gypsum, slaked lime, and a retarder, where a content ratio of the alumina cement is 47 to 57 mass%, a content ratio of the anhydrous gypsum is 27 to 40 mass%, a content ratio of the slaked lime is 6 to 14 mass%, a content ratio of the retarder is 1 to 6 mass%, and a ratio of the alumina cement to the anhydrous gypsum is 56:44 to 64:36 in a mass ratio of "alumina cement:anhydrous gypsum".;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT