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RE: [CONCRETE] When Is Concrete "Cracked"?

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See Table 4.1 in ACI 224R-01.
See ACI 318-05, Section R10.6.4 for what little 318 says about cracks.
For liquid-containing structures, see section R10.6.4 in ACI 350-06 for a more detailed discussion of flexural cracks.  Full thickness cracks (such as shrinkage cracks) typically start leaking at about 0.004-in width.
Bill Sherman

From: bill(--nospam--at) [mailto:bill(--nospam--at)]
Sent: Friday, May 16, 2008 12:42 PM
To: seaint(--nospam--at)
Subject: [CONCRETE] When Is Concrete "Cracked"?

I know that reinforced concrete "always cracks," but what is the criterion for determining when it is "too cracked;" that is, that the cracks are significant enough to need attention?

Seriously, I've had a tough time finding a defnition of this in ACI documents, etc.