In order to ensure that the poured concrete reaches the design strength within the specified age and prevent shrinkage cracks, the maintenance work must be done well. According to the characteristics of this project, the following maintenance methods are selected for different parts:

One is to cover horizontal members such as beams and plates to keep water.

Under the natural condition that the average temperature is higher than +5℃, the concrete surface is covered with covering materials and watered for curing, so that the concrete can maintain the appropriate temperature and humidity conditions required for hydration for a certain period of time.

Covering water conservation shall meet the following requirements:

1, covering and watering maintenance shall be carried out within 12h after concrete pouring.

2. During the period of concrete water conservation, the concrete mixed with portland cement and ordinary portland cement shall not be less than 7d.

3, the number of watering according to can keep the concrete in a wet state to decide.

4, concrete curing water is the same as mixing water.

5. When the average temperature of the day is lower than 5℃, watering is not allowed.

Second, the concrete column with film cloth maintenance.

Use waterproof and airtight film cloth for maintenance. Cover all exposed parts of the column surface tightly with film cloth to ensure that the concrete can be fully cured without losing water, www.fdcew.com. The advantages of this curing method are no need for watering, simple operation and reusability, which can improve the early strength of concrete and speed up the turnover of molds. When curing, there must be condensed water in the film cloth.

Three, the wall concrete with film curing liquid curing.

Film curing solution curing is to spray the film-forming solution on the concrete surface, and form a film on the concrete surface after the solution volatilizes, so that the concrete surface is isolated from the air, and the water in the closed concrete no longer evaporates, thus completing hydration.

Fourth, concrete curing in winter

The vertical structure concrete is cured by comprehensive heat storage method. For the horizontal structure, the method of laying plastic sheets and insulating quilts is used for heat preservation and maintenance, and the insulating quilts should be tightly covered to prevent the concrete from being exposed and ensure that the concrete is not frozen.