POLYMER MODIFIED RAPID-HARDENING CEMENT CONCRETE COMPOSITION AND REPAIRING METHOD OF CONCRETE STRUCTURE USING THE COMPOSITION

摘要

The present invention relates to a polymer-modified rapid-hardening cement concrete composition containing 8 to 35 wt% of rapid-hardening cement-based binding material, 20 to 65 wt% of fine aggregate, 20 to 70 wt% of coarse aggregate, 0.1 to 20 wt% of water, and 0.01 to 20 wt% of polymer-based modifier, in which the polymer-based modifier contains 75 to 99 wt% of styrene-acryl emulsion, 0.01 to 15 wt% of polymethacrylic acid methyl, 0.01 to 15 wt% of polybutadiene, 0.01 to 15 wt% of methacrylic acid methyl butadiene, and 0.01 to 15 wt% of vinyl toluene, and a repairing method for a concrete structure using the same. According to the present invention, concrete operability and concrete durability are improved based on the addition of the polymer-based modifier in which the styrene-acryl emulsion, polymethacrylic acid methyl, polybutadiene, methacrylic acid methyl butadiene, and vinyl toluene are mixed and the rapid-hardening cement-based binding material. In addition, concrete defects can be reduced based on the improvement of flexural strength, tensile strength, initial strength, long-term strength, chloride resistance, freezing and thawing resistance, and the like.