What are the measures to ensure the quality of concrete construction in winter

When winter comes, the weather gradually turns cold and the points of attention in concrete construction of concrete mixing stations should be changed to avoid the quality of concrete due to the influence of temperature and other factors.

For temperature control of the environment the temperature decrease for pouring concrete construction is to control the influence of temperature difference, the biggest due to hydration heat is larger, the center temperature can reach 70 ~ 70 ℃, single surface concrete temperature decrease rapidly, forming temperature difference between inside and outside, easy to result in the crack of the concrete.

Concrete quality control method of concrete mixing station is:

1. After pouring, the insulation and moisturizing work should be done immediately, and water should be added slowly to cover the heat preservation and sprinkler maintenance.

2. The temperature of the control center is controlled by the water cooling of the buried pipeline in the larger volume concrete. When the maintenance measures of the cooperation are low, the insulation and maintenance should be carried out to prevent the concrete from freezing, so as to reach the frozen critical strength at an early date, so as to avoid cracking and other problems. The concrete can be maintained by heat preservation, steam curing, electric heating and curing, and can add a certain amount of anti-freeze agent, water reducing agent, early strength agent to strengthen the quality.

3, heat preservation for a long time at night night low temperature for a long time, easy to cause loose concrete structure, insufficient strength, strength increased slowly, and a series of problems, and to avoid the moisture from the concrete frost heave, lead to concrete quality is unqualified, so for the curing of the concrete should be set at night can be laid for thermal insulation layer, and adjusted according to the temperature conditions, aims at overall control of concrete surface temperature meet the requirements, for large temperature difference between day and night and fast temperature change, should also be designated persons on duty to cope with the temperature fell sharply at night.