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Concrete Coring Test Specimen

Concrete Coring Test Specimen

Concrete Coring Test Specimen

(OP)
For an existing foundation, if a core to be broken for strength values is taken with rebar included, does the presence of the rebar (#3 to #5) lower the possible capacity of the test specimen?

To me, it would seem best, if not mandatory, to have no included steel in the test matrix.

For petrographic analysis, though, it would seem that the presence of rebar would not be a negative issue, but might actually enhance the visual analysis for the presence of bond and bleed water channels.

Thoughts?

Mike McCann, PE, SE (WA)


RE: Concrete Coring Test Specimen

Quote:

To me, it would seem best, if not mandatory, to have no included steel in the test matrix.
I would agree...rebar will either expand the tested compression sky high or possibly create an early fracture plane and reduce the test capacity.

Quote:

For petrographic analysis, though, it would seem that the presence of rebar would not be a negative issue
Agree here also but you might contact a petro analysis guy to verify.

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RE: Concrete Coring Test Specimen

Mike - Neville and Brooks in their text "Concrete Technology" discuss briefly the influence of reinforcement but Gambhir actually gives correction equations. (Gambhir, M.L. Concrete Technology, 2nd Edition, (1995) Tata McGraw-Hill Publishing Company Limited, New Delhi). As this is likely an obscure book for most, I have attached the relevant page. Given that it is an Indian publication, this most likely has its roots in the former British Standards which are being supplanted by European Norms.

RE: Concrete Coring Test Specimen

(OP)
Thanks JAE and Ron for your advice. I'll put it to good use.

Mike McCann, PE, SE (WA)


RE: Concrete Coring Test Specimen

Mike....you just offended BigH by calling him "Ron"......no problem, I'll take credit for anything he says....He's smarter than I am!

Agree with all the above. I've tested both ways. Depending on the orientation and location of the rebar, it can either increase the compressive strength or screw up the stress distibution in the same and give you whacky results.

Agree that it shouldn't be in the test specimen if it can be avoided for strength purposes. OK for petrography.

RE: Concrete Coring Test Specimen

(OP)
Sorry BigH. I honestly read that as Ron. Man getting old sucks.

Mike McCann, PE, SE (WA)


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