Cold weather is defined as air temperature below what degree during the protection period?

Cold weather conditions during concrete construction are typically defined by specific temperature thresholds to ensure proper curing and setting of the concrete. In this context, air temperatures below 40°F are considered cold weather, which can adversely affect the hydration process of concrete, leading to issues such as incomplete curing, reduced strength, and increased chances of cracking.

Concrete must be protected from these low temperatures during the protection period to maintain its integrity and performance. The protection measures often include the use of insulated blankets, heated enclosures, or additives that promote curing at lower temperatures. Knowing that cold weather is defined with respect to the 40°F threshold helps inspectors and construction professionals implement the necessary protective measures effectively to ensure the quality and durability of the concrete being placed.

Understanding this temperature threshold is crucial for compliance with industry standards and guidelines, as well as for ensuring the longevity and performance of concrete structures in varying weather conditions.