WATER-SOLUBLE COMPOSITE FOR STRENGTHENING AND PROTECTING THE OUTER LAYER OF CONCRETE BLOCK, MANUFACTURING METHOD OF CONCRETE BLOCK, AND METHOD FOR STRENGTHING THE OUTER LAYER OF CONCRETE BLOCK USING THE COMPOSITE

PURPOSE: A water-soluble composition for strengthening and protecting a surface layer of concrete block, a manufacturing method of concrete block using the same and superficial layer strengthening method of the concrete block are provided to enhance penetrating properties, water resistance, chemical resistance, acid-resistance, durability, salt tolerance and strength. CONSTITUTION: A water-soluble composition for strengthening and protecting a surface layer of concrete block comprises polymer emulsion having hydrophilicity and hydrophobicity and lithium silicate sol. The polymer emulsion comprises 60-95 parts by weight of styrene acryl, 0.1-25 parts by weight of 2-hydroxy ethylacrylate, 0.1-15 parts by weight of 2-methoxycarbonyl-1-propene, 0.1-7 parts by weight of sodium persulfate, and 0.1-15 parts by weight of zinc ammonium chloride. A manufacturing method of the concrete block comprises the following steps: installing mortar, in which a water-soluble composition for superficial layer strengthening of the concrete block is mixed, to a mold; installing a composition, in which 5-40 wt% of white cement, 0.5-10 wt% of copper slag or coarse aggregate, 5-80 wt% of dolomite or fine aggregate, 0.01-5 wt% of inorganic pigment, 0.01-5 wt% of water-soluble composition, 0.1-10 wt% of water, and 0.1-10 wt% of a composition for strengthening and protecting of a superficial layer are mixed, on top of the mortar in 0.3-3cm thickness; molding the installed composition by vibrating and compressing the same; and spreading the surface of the molded product with the composition for strengthening and protecting of concrete block and drying the same.