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Just fixed a crack in my driveway pour from last Tuesday
I had a small crack show up on a driveway I poured last Tuesday in Nashville. It was about 3 feet long and showed up after the first hot day we had. I thought I messed up the mix or the curing process. Turned out I just didn't wet the subbase enough before pouring. Dug out the crack, patched it with a repair mix, and it looks solid now. Anyone else deal with tiny cracks popping up fast in the summer heat?
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hall.charles5mo ago
Hot take but patching a crack that showed up that fast isn't really fixing the problem lol. That tiny crack was from the subbase drying out and pulling moisture from the concrete, but the real issue is the subbase wasn't compacted right either. Patching the top just hides it, next hot day that same spot or a new crack will pop up nearby. You gotta dig out at least 4 inches deep and make sure the gravel underneath is tamped solid with a plate compactor, not just wetted down. Wetting helps but it's not gonna fix a soft base that sinks under the slab. I'd keep an eye on it after the next rain or hot spell, bet you'll see more movement.
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riverowens5mo ago
Yeah the part about "hides it" really stuck with me. That's the thing with a lot of quick fixes in life, not just concrete. You see it with people who patch a drywall crack without figuring out the foundation shifted, or someone who throws a Band-Aid on a leaky pipe instead of replacing the whole section. The visible problem gets covered up but the real issue just keeps getting worse underneath. I learned that the hard way with a retaining wall that looked fine for a month after I "fixed" a bulge. Then it completely gave out one night during a thunderstorm. So yeah, you're probably right that I'll see more movement after the next rain, but at least now I know what to actually look for before it becomes a total mess.
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