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Re: Special Inspection

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UBC Chapter 17 "Special inspection" should not be confused with testing or contractor quality control.  Basically it is a code required extra set of eyes for certain items that the code believes are critical (or "special") for the proper performance of a structure.  It applies to ALL seismic categories.  Actual testing of concrete is given in UBC 1905.6,  "Evaluation and Acceptance of Concrete" which generally follows ACI 301 requirements such as:

UBC 1905.6.1.1  Samples for strength test of each class of concrete place each day shall be taken not less than once a day, or not less than once for each 150 cubic yards of concrete  or not less than once for each 5,000 square feet of surface area for slabs or walls. etc. etc.

Thomas Hunt, S.E.
ABS Consulting


11/01/2003 06:47 AM

Please respond to

Re: Special Inspection

In a message dated 10/31/2003 1:29:04 PM Eastern Standard Time, jpersing(--nospam--at)FHOARCH.COM writes:

I guess that's the reason for the UBC requiring an Inspection Program.  

Well,  doesn't the UBC only require special inspection for Seismic Performance categories greater than B?

If so,  when someone is out testing concrete on a "B" job,  what is it called?

Concrete testing is standard on almost all jobs, other than someone pouring a new patio.  But in this area, at least,  the concrete inspector often does not speak English.  If they speak English, they are likely a high-school drop out.   They are probably ACI certified,  but I would hate to think I was relying on them to be eyes and ears.  Whether they are contractually obligated to the owner or the engineer,  it seems they are really just testers - they do the test, they write down the numbers.

Post-tensioning is kind of interesting; usually if you have a blow-out,  it is because the tendons were placed with too much of a curvature - this is something an experienced person could probably see if reviewing the tendon layout before the concrete was poured.  Blowouts are never (at least in my experience)  blamed on the inspector, however, the inspector's contract may say something about verifying the tendon layout,  but the only thing they check is number of tendons and profile.

Also,  where else (how else) is concrete testing required by the codes, other than under the list of Special Inspection requirements?

Gail Kelley