Old timer told me to wet cure my slab for 7 days straight... I think he was wrong

I had a guy with 30 years in the trade tell me I needed to keep my driveway slab wet for a full week without letting it dry out even once. I followed his advice exactly, soaked it every few hours with a hose and covered it with wet burlap. After day 4 I noticed some surface crazing starting to show up, tiny hairline cracks all over. I stopped after day 5 and let it dry normally, and now at 3 months old that slab has more surface checking than a neighbor's job that only cured for 3 days. Maybe it was the mix we used or the weather being too hot that week, idk. Has anyone else seen wet curing backfire like that on a residential pour?

3 comments

3 Comments

wood.uma1d ago

Hate to say it but yeah, I've seen this exact thing happen before. Had a buddy do the same soak cure on his patio in July and got the same crazy surface checking you're talking about. Think the old timers learned that trick in a different era with different concrete mixes and different weather. Now with all the shrinkage compensating stuff and low water mixes we use, soaking it wet for a full week can actually mess with the surface hydration and cause that crazing. Plus if the temps are high and the water evaporates fast it's like a constant wet dry cycle that just aggravates the surface. You probably did everything right by the book but that method just doesnt translate well to modern pours especially in hot weather.

jordan_hill1d ago

My neighbor does the exact same thing with his lawn. Soaks it every single day during a dry spell, thinks he's helping. Ends up with shallow roots and a yard full of crabgrass. People just assume MORE water has gotta be better. Like we all forgot moderation is a thing. It's the same with concrete I guess. More isn't always the answer. Sometimes you just gotta let stuff dry out a little.

brooke_jones23h ago

Jumping off what wood.uma said about the constant wet dry cycle... that's exactly what I think happened to you. That whole soak cure thing works in a controlled environment, like a lab or a perfect cool shady spot, but out in the real world with the sun beating down on it, that water's just going to evaporate way too fast. So you're hitting it with a hose every few hours, but in reality you're just giving it a quick cool down and then letting it bake again. That constant change in temperature and moisture on the surface is what kicks off those tiny little cracks. The old guy probably had luck with it in his day on a shaded pour in the spring, but on a hot driveway it's a recipe for crazing.