Antifreeze only changes the critical temperature of concrete frost resistance and ensures that it will not be damaged by frost heaving at low temperature.
In addition, concrete curing in winter construction is no longer the concept of concrete construction in summer, and its main function is not to keep moisture and promote the hydration of cement. The main function of winter construction and maintenance is heat preservation, keeping the hydration heat of cement, and promoting the rapid increase of cement strength to above the critical frost resistance strength of concrete.
Therefore, it is essential to consider the requirements of health preservation at this level. Rapidly improving the strength and shortening the curing time can increase the turnover times of formwork and other materials, thus reducing the cost.
When the outside air temperature is lower than 5℃, concrete can be mixed with antifreeze or treated with damp heat. Attention should be paid to the maintenance of concrete mixed with antifreeze: under the condition of negative temperature, watering maintenance is not allowed; The exposed surface must be covered, and the parts with weak structure or vulnerable to freezing injury should be strengthened; The curing temperature shall not be lower than the critical temperature specified by antifreeze. If the temperature is lower than the critical temperature, heating and heat preservation measures should be taken.
Hope to adopt.