CEMENT CONCRETE COMPOSITE WITH HIGH DURABILITY AND SELF-REPAIRING AND REPAIR METHOD FOR CONCRETE STRUCTURE USING THE COMPOSITE

摘要

The present invention relates to a cement concrete composite, which includes 5-40% by weight of a binder, 25-70% by weight of fine aggregates, 20-65% by weight of coarse aggregates and 0.1-20% by weight of water, and an overlay pavement method for maintenance and protection of a concrete structure using the same. The binder includes 40-95% by weight of Portland cement, 1-50% by weight of phyllite powder having the specific surface of 3,500-4,500 cm^2/g and containing 70% or more of SiO_2, 1-30% by weight of blast furnace slag having 4,000-5,000 cm^2/g, 0.01-10 % by weight of rice hull aches having a specific surface of 10,000-12,000 cm^2/g, 0.01-15 % by weight of a powder-type durability improver, 0.01-5% by weight of a water reducing agent, 0.01-5% by weight of an antifoaming agent, and 0.01- 5% by weight of a shrinkage reducing agent. According to the present invention, the binder is mixed to sufficiently ensure finishing work time so that the workability can be improved. In addition insoluble calcium hydroxide is generated by using activated silica to promote the initial hydration of the cement and the densification of the texture of the cement, so dense cement can be produced. Accordingly, it is possible to prevent the surface cracking and expansion breakdown phenomenon of the cement and improve he flexural toughness, the bond strength, the long-term strength and the durability of the cement. Particularly, the flame retardancy, the freeze-thaw resistance and the alkali resistance of the cement can be improved.