Ultra high strength concrete composition using type i cement

PURPOSE: An ultra high strength concrete composition using a first kind of cement is provided to improve application property by mixing low viscosity concrete using silica fume with low fineness. CONSTITUTION: An ultra high strength concrete composition using a first kind of cement has unit amount of 130-150kg/m^3, 11-13 wt% of water-binder, 2.9-3.1 weight% of fine aggregate assembly rate, 15-45 wt% of fine aggregate rate. The binder comprises 50-70 wt% of normal Portland cement, 15-25 wt% of low fineness silica fume having fineness of 80000-150000 cm^2/g and 15-25 wt% of blast furnace slag powder having fineness of 40,000-10,000cm^2/g. The binder additionally includes anhydrous gypsum.