ULTRA HIGH STRENGTH CONCRETE COMPOSITION FOR PHC PILE AND PREPARATION METHODS OF PHC PILE USING THEREOF

摘要

The present invention relates to a concrete composition for a PHC pile having ultra-high strength. The concrete composition comprises: 105-135 kg/m^3 of a unit material; 450-650 kg/m^3 of a unit binding material; 600-800 kg/m^3 of a unit fine aggregate material; and 1,000-13,000 kg/m^3 of a unit coarse aggregate material. The binding material comprises 5-50 parts by weight of a mixing material and 1-5 parts by weight of a water reducing agent with respect to 100 parts by weight of cement. The cement is three or more kinds of high early strength cement. The mixing material includes 40-80 wt% of silica powder, 10-30 wt% of limestone, and 10-30 wt% of a blast furnace fine powder with respect to the total weigh of the mixing agent. According to the present invention, the concrete composition for a PHC pile is used for manufacturing the PHC pile having ultra-high strength.