When placing concrete, what temperature should special protection be provided for?

When placing concrete, special protection should be provided at temperatures around 40°F. At this temperature level, the risk of freezing and adverse effects on the curing process increases significantly. Concrete needs to set and cure properly to achieve its designed strength and durability, and temperatures around or below this threshold can lead to issues like incomplete hydration, freeze-thaw damage, and ultimately, compromised structural integrity.

Providing protection, such as insulating blankets or heated enclosures, ensures that the concrete remains above critical temperatures during the curing stage, allowing for proper hydration and strength development even in cold conditions. This practice is essential in preventing potential issues and ensuring the longevity of the concrete structure.