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Re: Testing Old Concrete

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Thank you, Daryl, for the update on this project.

On 22 Sep 2013 at 14:22, h.d.richardson(--nospam--at) wrote:

> Fellow engineers,
> Back in August I submitted the inquiry below regarding the
> testing
> of old concrete.  As I indicated below the problem with the testing is
> that
> cores were not practical to retrieve due to crumbling of the
> concrete.
> The reason given by the testing expert is that the old concrete
> frequently was mixed using golf ball, and even baseball size aggregate
> with smooth, not crushed surfaces, hence the concrete often does not
> test well but usually performs well in practice.
> We, therefore, did some drilled and epoxied anchor pull-out
> and
> shear tests.  The test results were reasonably compatible with HILTI
> published values.  The ultimate values that I had assumed in my design
> were
> about 70% to 75% of the measured test values.  I, therefore, decided
> not

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