COMPOSITION FOR CONCRETE HAVING IMPROVED FREEZE HAZARD RESISTANCE, MOLDED ARTICLE FORMED BY MOLDING THE SAME, MANUFACTURING METHOD THEREOF AND QUALITY CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a composition for concrete having improved freeze hazard resistance, molded article formed by molding the same, manufacturing method thereof and quality control method.SOLUTION: The composition for concrete according to the present invention contains a fine aggregate including blast furnace slag fine aggregate, a binder material including cement, water, and a coarse aggregate, and has suppressed bleeding. The relative dynamic modulus of elasticity at a freeze-thaw cycle of 300 times in a freeze-thaw test based on the method A described in JIS A 1148 for a concrete specimen made from the concrete composition is 60% or more, which means the excellence in freezing and thawing resistance.SELECTED DRAWING: None