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Re: New Subject-Testing Dowels/Expansion Bolts

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The testing engineers on the list can give you the best answer, but I would
also check with the local building department for their requirements. Bolts
in masonry have a different procedure than in concrete and prequalification
tests for variations in bolt type are acceptable to determine allowable
loads. Usually the proof loads are 1.5 to 2.5 times the *design* load, but I
would be careful, for example if you use an HD 10 anchor for a 1000 lb
design load, someone may try to use the full allowable load in the future
for some other remodel.

I once had a job where a rod was pull tested to 10k, but it failed at 8k.
Turns out that the contractor embedded it only 3" (spec'd at 14") with epoxy
on only half of the rod and it still made it to 8k. I don't think a pull
test can fail the concrete unless the ram supports are outside the cone
failure zone, so the test is really just testing the epoxy bond.

Jeff Smith
-----Original Message-----
From: suresh <suresh(--nospam--at)>
To: seaoc(--nospam--at) <seaoc(--nospam--at)>
Date: Saturday, January 31, 1998 6:07 PM
Subject: New Subject-Testing Dowels/Expansion Bolts

>Any suggestions on what percentage of drill-and-bond dowels (or exp. bolts)
installed in the OLD concrete to be specified for testing, and what should
the test load be (in terms of the specified allowable capacity)??. It is
possible that the old concrete might fail (in cone failure) during the test.
How can this situation be handled in the specifications? Any suggestions
would be appreciated.
>Oakland, CA