How Cold Is Too Cold for Concrete?

When temperatures dip below 40 °f, the chemical reactions that strengthen concrete slow down and can lead to weaker concrete. If concrete curing temperatures are below freezing, the water inside the concrete can freeze and expand, resulting in cracks.

How Cold Is Too Cold for Concrete?

When it comes to building with concrete, there is a certain temperature range that should be maintained in order for the concrete to be able to reach its full potential. This range is typically between 40°F and 80°F, although some builders will take advantage of the fact that concrete can be poured at temperatures as low as 20°F. But what happens when the temperature drops below 20°F? What is the coldest temperature that concrete can handle before it becomes too cold for concrete?

Concrete is a composite material made up of cement, aggregate, and water that undergoes a chemical reaction, known as hydration, when the concrete is mixed with the water. This hydration process is what gives concrete its strength and durability. Unfortunately, when the concrete is exposed to extremely cold temperatures, this process is hindered or even stopped, which can lead to a weakening of the concrete. In some cases, the concrete can even crack due to the extreme cold.

The American Concrete Institute (ACI) has established a set of guidelines that builders must follow when pouring concrete in cold weather. The guidelines state that the temperature of the concrete should remain above 20°F and the air temperature should not drop below 32°F for an extended