Guide to Pouring Concrete in Cold Weather

Concrete should be protected from freezing in the first 24 hours or until it has reached a minimum strength of 500 psi after it has been poured. The American Concrete Institute (ACI) defines 'too cold' as when, for more than three days successively, the average daytime temperature is below 40 degrees Fahrenheit. Concrete can lose up to 50% of its final strength if it becomes too cold too quickly. Before pouring, preheat the aggregate and water (not the concrete itself), work in batches, and avoid using slag cement or fly ash during colder periods. During pouring, set up windbreaks to protect against heavy winds, and if temperatures drop significantly, set up heat enclosures using canvas, tarps, wood, or polyethylene sheets. After pouring, leave forms in place as long as possible, use concrete curing blankets, and check the internal temperature using an infrared temperature sensor — the optimal temperature is at least 40 degrees Fahrenheit. Wait until all bleed water has evaporated before finishing. ACI recommends minimum curing periods ranging from 3 days (Type III cement) to 14 days (Type IV or V cement). A-Core Concrete Specialists have been serving the Utah region since 1974, skilled in concrete cutting, core drilling, concrete pouring, demolition, GPR scanning, and grinding and grooving.