| abstract |
The present invention relates to a process for producing a quick-setting type binder, which comprises 4 to 30% by weight of a fast-spinning binder, 25 to 65% by weight of a fine aggregate, 20 to 60% by weight of a coarse aggregate, 0.1 to 15% by weight of water and 0.01 to 15% by weight of a polymer admixture, Is a binder which exhibits strength at 12 hours of age and is usually 20 to 55 wt% of Portland cement, 5 to 40 wt% of calcium or magnesium sulfoaluminate, 0.1 to 25 wt% of aluminate, 0.01 to 20 wt% of gypsum, 0.01 to 20% by weight of fly ash, 0.01 to 20% by weight of aluminum hydroxide, 0.01 to 10% by weight of aluminum hydroxide and 0.01 to 10% by weight of barium sulfate, wherein the polymer admixture comprises 50 to 99% by weight of methyl methacrylate, By weight of propylene glycol, 0.1 to 15% by weight of butyl acrylate, 0.01 to 10% by weight of polyethylene propylene, 0.01 to 10% by weight of itaconic acid, 0.01 to 10% by weight of sodium persulfate and 0.01 to 10% Characterized in that, And a maintenance method of a concrete structure using the composition. According to the present invention, it is possible to improve workability of concrete, improve durability of concrete, and reduce defects of concrete by improving bending strength, tensile strength, initial strength, long term strength, salt resistance and freezing and thawing resistance. |