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axe 02-23-2010 11:45 AM

hair line on concrete slab

I got my concrete pour in 5 sacks about 14 yards. After the contactor finish pouring the slab. I started to see hair line crack through out the drive way. Why is that. He said sometime it has that crack.

inspectorD 02-23-2010 12:22 PM

Concrete shrinks, and you need to groove a control joint into the concrete. This way the crack is going to be less noticable.

Just the way it is.:(

Wuzzat? 02-23-2010 12:29 PM


Originally Posted by axe (Post 41275)
hair line crack
Why is that.
sometime it has that crack.

Have him put that statement in writing, signed and dated.

funetical 02-23-2010 12:31 PM

So then cracks in cement are normal?

Wuzzat? 02-23-2010 02:49 PM

Preventing Concrete Cracks - The Concrete Network

itsreallyconc 02-26-2010 09:29 AM

normal ? no, of course not ! ! ! if that were the case, it wouldn't be the world's largest building mtl,,, however, they aren't unusual & the fault's often found w/the contractor,,, you don't mention what TYPE of crack's there so its difficult to give any advice,,, do like the idea of a sign'd letter - good luck w/that ! ! ! :rofl:

axe 03-24-2010 10:25 AM

Thanks for the reply. He does have control joint. It even crack on the smallest slab that is only 5x8. THat why it drive me naughts. Concrete sucks. but what it is, is what it is. Thanks

mudmixer 03-24-2010 12:12 PM

axe -

If the contractor used too much water or idi not finish the concrete correctly, you can expect cracks (especially thin surface cracks). - That is why there are good contractors and bad contractors.

The surface cracks are not minimized by control joints that are for other purposes.

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