When using cement antifreeze, you need to add the antifreeze according to the weight of the cement, then clean the mixer, add sand, gravel and hot water to mix, then add the cement and antifreeze and mix. Finally, cover the sand and stones with canvas or plastic sheeting to prevent thawing.
1. General Portland cement or slag Portland cement is suitable. The production date of cement cannot exceed 2 months. Note that the cement must be above 32.5 and must be stored in the greenhouse the day before use. Before construction, remove stains on the surface of formwork and steel bars and perform maintenance. Aggregate: The quality of the sand and gravel used should comply with relevant national regulations on winter construction, and the aggregate should not contain ice, snow and other icing substances.
2. Adding amount: 4~6% can be added at 0~5℃
-When 5-10℃, 5-8% can be added
-When 10-15℃, 8-8% can be added 10% concrete
3. The concrete raw materials specified in the "Code for Construction and Acceptance of Reinforced Concrete Projects" must comply. The molding temperature of the newly poured concrete should not be less than 5' C. Cover it with plastic film and 1-2 straw bags immediately after molding, and insulate and moisturize the newly poured concrete. The curing period should be at least 7 days.
Extension: Cement antifreeze combined with winter climate conditions can accelerate the solidification and hardening of cement in low-temperature environments, and its strength increases significantly, which is beneficial to later development. Strength is not affected in any way, and the chlorine-free salt prevents corrosion of the steel bars and increases their durability.
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