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Hello members I hope this thread finds you well. My query today is related to compressive strength of concrete bored piles. The issue is that pilegroup with 24 no of piles have been casted almost two years ago but there were observations regarding quality control on couple of piles in the group which are not known. Now the higher-ups are recommending to resume the project again and unfortunately I'm the incumbent and have to propose a methodology. Now the question is that since the piles are already buried underground, which procedure shall be adopted to predict its compressive strength near to its actual. Your suggestions will highly be appreciated. Thanks.

There are different way depending upon the risk category of the structure. Pile capacity of concrete is one things and geotechnical capacity is another. The best way would be to do a pile load test on this pile group. Geotechnical consultants normally do such test and it helps verify capacity of existing piles both structurally and geotechnically. For concrete strength, like you said core testing is one way. I am not familiar with GPR for strength testing of concrete piles. I have seen a lot of results of GPR surverys to find buried lines but nothing to determine strength. Hope this helps.