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Old 10-14-2010, 10:58 AM   #1
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Cracks in new concrete - IMPORTANT


Hi folks....

I recently (1 month ago) had a large pad (24x26 feet) concrete pad poured for a floor of a pole building workshop. There are 2 hairline cracks developing about 10 feet apart from each other and about 6-8 feet long. They both are running the same direction laterally (24 feet across dimension). Though I was not present when they poured (contractors) wife tells me they put down rocks and rebar.

Any comments or thoughts concerning this? what can be done at this stage to minimize? what do I need to look out for?

any feedback is appreciated.
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Old 10-14-2010, 11:03 AM   #2
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Cracks in new concrete - IMPORTANT


Got any pics?
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Old 10-14-2010, 01:46 PM   #3
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Cracks in new concrete - IMPORTANT


Hairline cracks aren't an issue until they begin to separate either vertically or horizontally.
What size of rebars? What spacing? How thick is the slab? Was the bar centred in the slab?
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Old 10-14-2010, 06:53 PM   #4
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Cracks in new concrete - IMPORTANT


These new cracks are not in the control joints already cut? http://www.nrmca.org/aboutconcrete/cips/06p.pdf

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Old 10-16-2010, 07:26 AM   #5
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Cracks in new concrete - IMPORTANT


If I had to venture a guess, I'd say the cracks developed right off of the posts, which is ironically where the control joints should have been cut.

We always isolate the posts with expansion material, to allow the slab some movement when it's shrinks, and still cut control joints.

24' x 26' is far too large for no joints, unless it's over a foot thick and had a great cure.
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