Cement mortar composite with excellent workability and water resistance repair method of concrete structure injection repair method for the concrete structure surface treating method of the concrete structure and surface protection method of the concrete structure using the composite

摘要

The present invention relates to a cement mortar composition having excellent constructability and waterproofness, and a repair method for a concrete structure, an injection repair method for a concrete structure, a surface treatment method for a concrete structure, and a surface protection treatment method for a concrete structure using the cement mortar composition. The cement mortar composition is composed of: 15-55 wt% of a cement-based binder; 15-55 wt% of fine aggregate; 0.1-30 wt% of a polymer-based admixture; and 5-40 wt% of water. The cement-based binder is composed of: 20-80 wt% of particle cement having 3,500-7,000 cm^2/g of Blaine fineness; 5-35 wt% of plaster; 10-40 wt% of calcium aluminate, and 0.1-10 wt% of lithium carbonate. The polymer-based admixture is composed of: 45-85 wt% of a polyurethane resin; 0.1-25 wt% of an isocyanate-based curing agent; 0.1-20 wt% of dibutyltin dilaurate; and 0.01-15 wt% of phosphazene. Therefore, the cement mortar composition can be easily constructed in a short time by being cured quickly, and can have excellent waterproofness and durability.