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Concrete Compression Tests

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The ASTM default standard for compression test cylinder molds (for
acceptance testing) has been 6 inch diameter x 12 inches for as long as I
can remember, but the test labs tell me that about half the tests they run
these days are on 4 inch diameter x 8 inch specimens. Has anybody out there
had problems with the reliability of the tests done with the smaller
specimen size. The tests are a little cheaper with the smaller size, and I'm
getting asked if it's ok to use them.I don't know whether I should go with
the flow or insist on the old standby.

Jim Lutz
Earth Tech, Inc.

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