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New Subject-Testing Dowels/Expansion Bolts

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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.

Suresh
Oakland, CA