YYA, that is, backwater and spray, the special slurry is a dry-mixed inorganic slurry composed of dozens of components. After stirring with water, it can promote the oxidation reaction of all metal elements in the gel and in the coarse and fine aggregates. Produces a high electrolyte, which disintegrates the particles and accelerates their hydration speed to the extent of complete hydration. A large amount of high-concentration slurry is simultaneously produced in the oxidation reaction, and has good colloidality and compactness. After hardening, it has the properties of resistance to water penetration, resistance to shrinkage and cracking.