What should be the mix proportions of antifreeze concrete admixture during freezing conditions and also suitable antifreeze to be used.
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Mix proportion of admixture in antifreeze concrete :
More information :
Any type of antifreeze product prevents the water against freezing before or during the hydration process of cement.
The problem is not preventing concrete from freezing. The problem is concrete quits hardening when the temperature drops below 50 degees F. Concrete produces heat with the heat of hydration and will aid in the hardening process. Cold weather concreting methods should be used and consist of insulating the concrete and/or providing heaters. Monitoring the temperature with thermometers is required.
Some people add calcium chloride to increase the heat of hydration. Calcium chlodride can cause some reinforcing steel to crorrode.
Madeh Izat Hamakareem
The mixing ratio of the concrete or the mortar, and the amount of the admixture to be used must be defined with the laboratory trials, using the raw materials taken from the construction site, depending on the required concrete class and the quality, and ambient temperature, Table below provide a percentage of the weight of the dry concrete mixture.
Regarding types of antifreeze admixture, please visit the following link:
An antifreeze admixture consisting of sodium nitrate and sodium sulfate in a ratio of sodium nitrate to sodium sulphate of 3:1 and wherein the admixture is present in the amount of from 2% to 8% , by weight of mixture.