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RE: Concrete Cracks.

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Nick:

In "Design & Construction Failures", Dov Kaminetzky defines a "hairline"
crack as being usually less than 0.005 inches wide. He references ACI 201,
but I don't have a copy of that handy. He further states that existing "old"
hairline cracks may be classified as negligible, but "new" ones should be
monitored.

Hope this helps.


Regards,
Dave K. Adams, P.E.
Lane Engineers, Inc.
PH: (559) 688-5263
E-mail: davea(--nospam--at)laneengineers.com


-----Original Message-----
From: npitera(--nospam--at)mmm.com [mailto:npitera(--nospam--at)mmm.com]
Sent: Friday, December 15, 2000 9:11 AM
To: seaint(--nospam--at)seaint.org
Subject: Concrete Cracks.




In concrete, there are cracks, and then there are CRACKS. For beam shear
cracks,
at what width limit does one consider the crack to be "hairline",0.
003",0.005"
0.007"?

Any comments are great appreciated.

Regards,

Nick.