1905.6.2.4 Strength test.
BC § 1905.6.2.4
A strength test shall be the average of the strengths of two 6" x 12" or two 4" x 8" cylinders made from the same sample of concrete and tested at 28 days or at the test age designated for the determination of f 'c . Consideration shall be given to specifying an f 'c at 56 days or later for concrete utilizing pozzolans in the mix proportions. At the discretion of the registered design professional of record or the approved agency performing the testing, additional pairs of test cylinders may be taken at the time of sampling for testing at a later date. The additional cylinders may be tested at a later date should the strength at the specified date not meet the required f 'c .
