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Precautions
Precautions which may be taken to protect the concrete in cold weather may consist of one or more of the following practices:
→ Avoid very cold mornings, so pour later in the day when everything has warmed up.
→ use (chloride-free) accelerating admixture and or higher cement contents
→ Providing heaters, insulating materials, and enclosures if sub-zero temperatures are expected
→ Do not placing concrete on frozen ground
→ Ensuring means of maintaining suitable curing temperatures - the temperature of the concrete should be maintained at 20°C or above for 3 days
→ Insulating the concrete with a thick insulating blanket
LAYING
IN COLD WEATHER
When concrete sets it is the result of the cement having a chemical reaction with water. Very cold temperatures slow down this reaction and so set times are slower. Keeping the temperature of the concrete as high as possible is therefore the goal.
Checklist
✓ Avoid sub zero times
✓ Use higher cement (strengths) mixes
✓ Insulate