The Effect of Temperature on Concrete Setting Time
Concrete placed in cold weather can result in insufficient strength and durability. The amount of protection concrete needs from cold weather increases dramatically as ambient (outside) temperatures decrease.
Concrete setting times vary greatly depending on the temperature. In general, setting times go up approximately 33 percent for every 10°F decrease in temperature.
Here’s a breakdown of setting times at various temperatures:
Temperature Approximate Concrete Setting Time
70°F – 6 hours
60°F – 8 hours
50°F – 11 hours
40°F – 14 hours
30°F – 19 hours
20°F – Concrete will freeze
As you can see, setting time increases dramatically as the outside temperature decreases. In order to maintain optimal curing temperatures of 65 – 85°F, use Powerblanket® concrete curing blankets. Powerblanket® concrete curing blankets create a consistent temperature regardless of daily or hourly changes in outside temperature. The sooner concrete sets and cures, the sooner you can continue the construction process, saving valuable time and cost.
To ensure optimal setting time, here are some tips for cold weather placements:
- Use a heated Powerblanket® or warm concrete mix.
- Don’t allow the concrete to freeze – use Powerblanket® concrete curing blankets to control temperature.
- Don’t place concrete on a frozen sub-grade – use Powerblanket® thawing blankets to control temperature.
- Protect concrete from excessive drying.
- Incorporate accelerators to maintain strength and normal set time.
- Avoid rapid changes in concrete temperature with Powerblanket® concrete curing blankets.
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