Concrete can gradually set and harden after being cast, mainly because of the curing effect of cement-water concrete, and hydration needs suitable temperature and humidity conditions. Therefore, in order to ensure that concrete has suitable curing conditions and the strength continues to grow, concrete must be cured. After concrete pouring, if the weather is hot and the air is dry, the water in the concrete evaporates too quickly, which leads to dehydration, so that the cement particles that have formed gel can not be fully hydrated, can not be transformed into stable crystals, and lack sufficient cohesive force, thus causing the concrete surface to fall off in flake or powder. In addition, when concrete does not have enough strength, premature evaporation of water will also produce large shrinkage deformation and dry shrinkage cracks, which will affect the durability and integrity of concrete. Therefore, the initial curing after concrete pouring is very important. Concrete should be cured immediately after final setting, and hard concrete should be cured immediately after pouring. In summer, the initial setting time of concrete is generally 2-3 hours, and the final setting time is generally 5-7 hours.