3. Transparency protection. That is, using special molecular structure, materials can penetrate into the surface of concrete slurry, they gather on the capillary wall of matrix surface to form hydrophobic film, water permeability protection can greatly reduce the water in concrete holes, reduce the erosion of chloride ions, Prevent damage caused by freeze-dissolution and steel corrosion; long-term durability, alkali resistance, UV resistance keep concrete holes permeable and natural appearance.