1. Cover concrete with straw curtains, sacks, sawdust, etc. Water shall be kept moist within 3 ~ 12h after concrete pouring, the concrete mixed with ordinary cement, portland cement and slag cement shall be cured for not less than 7d, and the retarded admixture and impervious concrete shall be mixed for not less than14d; ; When the temperature is above 15℃, water it at least once every 3 hours during the day and twice at night in the first 3 days after concrete pouring, and then water it about three times in the morning and evening. When the temperature is high or the climate is dry, the watering frequency should be appropriately increased.

2. When the average temperature of the day is lower than 5 degrees Celsius, watering is not allowed.

3. For large-area structures such as floor slab and roof slab, water storage maintenance can be adopted; For water storage tanks and other projects, water injection can be used for maintenance after the internal model is removed; For underground foundation engineering, covering soil can be used for maintenance. (Watering and maintenance of precast members, covering and maintenance of foundation works)

Moisturizing and curing of plastic film;

The plastic film is used as the covering, so that the concrete is isolated from the air, the water is no longer evaporated, and the cement is hardened by hydration and condensation of water in the concrete. It improves the construction conditions, saves labor and water, and ensures the curing quality of concrete. Moisturizing curing can be divided into plastic sheet curing and spraying plastic film curing liquid curing. (Moisturizing maintenance of row piles and frame columns) When using plastic film cloth for maintenance, its outer surface should be tightly covered and wrapped, and the secondary builder should also protect the plastic cloth from condensation water.