Concrete curing agent, also known as concrete curing liquid, is a kind of coating. Sprayed concrete curing agent is a kind of polymer material, which is sprayed on the concrete surface and solidified to form a dense film, which isolates the concrete surface from the air and greatly reduces the evaporation loss of water on the concrete surface. Therefore, the hydration of concrete can be completed to the maximum extent by using its own moisture, and the purpose of maintenance can be achieved. The spraying amount depends on the product and the effect to be achieved, and should be determined according to the product description or test. Concrete curing agent is a new colloid curing agent synthesized from organic polymer materials and inorganic alkali metal silicate. When the curing agent is sprayed on the concrete surface, it can not only form a covering film on the concrete surface quickly, but also react with the free calcium hydroxide in the shallow layer of concrete to form a dense and hard surface layer in the permeable layer, so as to prevent the water in the cement concrete from evaporating, make the cement fully hydrated and achieve the purpose of autotrophic. The purpose of curing agent is to protect concrete, because the surface of concrete loses water during the hardening process, and the concrete will shrink and produce cracks, which are called plastic shrinkage cracks. Before the final setting of concrete, it is impossible to spray water for curing, so using curing agent is a better choice. Some concrete structures are difficult to be wetted by water, and can also be protected by curing agent. Concrete curing is surface moisturizing, and the essential function of curing agent is "protection" rather than "curing", because the concept of curing is to prevent concrete from losing water, replenish water, help cement hydrate and make its strength grow healthily.

Judging from the above materials, the disadvantage is that even if curing agent is used, the early curing still needs watering, which is equivalent to the final setting of concrete. At this time, curing agent can be used, which saves the trouble of manual water spraying, but this thing can not be used until it is cured in the early stage. If the early maintenance is not done well, it seems bad to use curing agent directly.