HIGH FUNCTIONAL BINDER COMPOSITION FOR CARBON DIOXIDE REDUCTION DISPLAYING PROPERTIES OF EARLY STRENGTH

摘要

PURPOSE: A carbon dioxide reduction type binder composition which has high early strength property is provided to improve concrete strength degradation according to large amount of industrial byproduct and cement use by including phosphate magnesia, clinker dust, calcium hydroxide, and a mixture of calcium Sulfoaluminate aluminate based compound and dimorphism anhydrous gypsum. CONSTITUTION: A carbon dioxide reduction type binder composition which has high early strength property comprises 10-20 weight% of normal Portland cement, 30-80 weight% of blast furnace slag micropowder, 5-30 weight% of fly ash, 1-5 weight% of calcium hydroxide, 1-10 weight% of mixture of calcium sulfoaluminate(4CaO3Al2O3SO3) based compound(CSA) and dimorphism anhydrous gypsum(CaSO4), and 1-10 weight% of clinker dust, and 1-3 weight% of phosphate magnesia. A weight ratio of the dimorphism anhydrous gypsum to CSA is 1:1-4. The Blaine of clinker dust has a specific surface area of 8,000-12,000cm^2/g. Content amount of SO3 is 2-5 weight% and K2O+Na2O is 1-5 weight%.