What temperature defines "cold weather concrete" operations?

The definition of "cold weather concrete" operations typically refers to conditions where the ambient temperature is at or below 40 degrees Fahrenheit. This standard recognizes that as temperatures drop, the curing and setting processes of concrete can be adversely affected. Cold weather can slow down the hydration process, potentially leading to problems such as incomplete curing, poor strength development, and increased risk of cracking.

Operating at temperatures above 40 degrees Fahrenheit provides a more suitable environment for concrete placement, allowing it to set and cure more effectively while minimizing the risk of complications associated with lower temperatures. Hence, the temperature threshold set at 40 degrees is critical for ensuring the integrity and performance of concrete in colder conditions.