for concrete structural projects constructed in winter, the amount of concrete antifreeze should be selected according to the type of concrete antifreeze.

① when using a single antifreeze component, the maximum amount of antifreeze should not be greater than the following regulations: the amount of chlorine salts should not be greater than 7% of the mixing water; sodium nitrite the dosage of calcium nitrite, sodium nitrate and calcium nitrate shall not exceed 5% of the weight of cement; the dosage of urea shall not exceed 4% of the weight of cement; the dosage of potassium carbonate shall not exceed 10% of the weight of cement.

② when using concrete antifreeze with composite components, the selection should be based on the temperature, dosage and process requirements specified in the product manual. it is strictly prohibited to adjust the dosage at will. quantity.