Concrete Curing In Hot Weather

Curing is crucial at all the time, but it is particularly important in dry, hot conditions. It should begin when your closing operations are complete. If you are using plain gray concrete, choose curing compounds with white pigments which will reflect sunlight. If you’re employing a curing blanket make sure to use white ones that are single-use or the multi-use (Read further about curing concrete).

If you’re using curing compounds, be sure that it’s doing its job. Kozeliski recommends performing tests like this “Put an inch-square, 3-foot square piece of material on top, and place sand on the edges. Check back later and , if you notice that there’s water underneath the plastic, then the curing compound isn’t performing the job. Sometimes, contractors suffer from fractures, and they blame their concrete but in reality, the curing compound didn’t perform its job.”

Curing blankets in white can help keep concrete cooler , by reflecting sunlight. PNA Construction Technologies.

HOW do you deal with HOT WEATHER ON JOB SITE

If you begin with concrete that is below 80 degrees The goal is to maintain it’s cool and keep it from drying out. If you are experiencing extremely hot weather put the concrete in place early in the morning or at night. Make sure you are prepared! Be sure that your crew and equipment is ready to go when concrete arrives to remove the concrete from the truck. It will heat up quite a bit waiting in the mixer for it to be placed. Friction in the concrete while mixing could produce enough heat to raise the temperature of concrete by 5 degrees in 30 minutes.

Make sure that the sun is off the concrete surface, if at all possible. For indoor slabs, you should place them after the building has been sealed in. Outside, you can make use of sun shades. Make sure to keep all of your equipment and tools away from the sun particularly things like pump hoses which will come into direct contact with concrete.

For concrete for exterior use, where you’re putting it on a subgrade, you should wet all surfaces, including subgrades and forms by using cool water prior to putting the concrete. This will ensure that the moisture won’t be absorption into the concrete which could lead to cracks. “Wet the subgrade in a way that the water runs all the way to four inches of concrete,” Kozeliski says. Kozeliski. “Too often, contractors only gets the top 1/16″ wet and then it drains the water completely out.”

When the concrete is drained or bull floated apply the monomolecular film, also known as an evaporation retarder. The materials will evaporate in some time and do not have any negative effect on the concrete , but they stop the evaporation of water on the surface. Monomolecular film can prevent the cracking of plastic and surface crusting.


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