How to Use Concrete Curing Blankets in Winter

Cold weather can complicate any construction project that requires concrete because it's more difficult for it to cure properly at lower temperatures. Fortunately, concrete wet curing blankets make it possible for concrete to cure properly even during the winter months. Here's what you need to know about why concrete blankets are important and how to use them.

Cold Weather Complications for Concrete

Concrete can only cure properly under the right conditions because certain chemical reactions have to occur for the curing to happen. When concrete dries out too quickly, like in hot conditions, its strength is greatly compromised. However, the same is true for concrete that freezes before curing. If concrete freezes, its potential strength can be cut in half. It's important to keep the concrete at the optimal temperature to keep this from happening.

Cold Weather Concrete

Concrete that's poured in certain conditions is referred to as cold weather concrete, so it must be cured using different methods than regular curing. Cold weather is defined by temperatures below 40 degrees Fahrenheit for more than 3 successive days. In addition, the air temperature is less than 50 degrees Fahrenheit for more than half of a 24-hour time frame. Concrete can still be poured and cured with the right methods in these conditions; however, it's important to remember that concrete shouldn't be poured when temperatures are below 20 degrees because the concrete will freeze and hydration won't occur.

Using Concrete Blankets

Before purchasing and using a concrete curing blanket for sale, be sure to properly prepare the area where the concrete will be poured. Concrete should not be poured on ground that's frozen, icy, or snow covered. Heaters must be used to thaw the ground first. There are mix design changes to consider as well, such as heated water or aggregate. You'll also need to decide what type of concrete blanket to use. Fiberglass insulating blankets are a popular choice and are covered with polyethylene fabric. Closed-cell foam blankets are another option and are usually more effective than fiberglass blankets. Be sure the blankets have grommets and buttons to keep the blanket in place. The blankets will keep the concrete above 50 degrees over the 3-7 days required for curing.