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Crackman Tip 20 - How Long does it take a Concrete Slab to Dry? – Providence, RI

Joseph Coupal - Wednesday, May 10, 2017

Frank in Providence, RI: “How long can I estimate for a new concrete slab to dry?”

Crackman: That is a very interesting question. There are a lot of factors that contribute to how long it takes concrete to dry. There are a lot of different materials in concrete and it depends on the materials used, the amount of water and temperature around that slab, and is wind there.

You want that concrete to dry as much as possible. Concrete is an expensive product to pour, and labor to apply it. So you don’t want to go on it too soon. We are not just talking about stepping on it, people drive cars and machinery on it. What you want to do is a relative humidity test which can be done on slabs. This determines how much water is in the, when it is at least 90% cure. Concrete never fully cures, there is always water or moisture in it. If you are going to drive a car or put heavy equipment on it, you should wait at least a week or more so you don’t take one step forward and two back.

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