5.4 Specimen Size versus Aggregate Size—The diameter of
a cylindrical specimen or minimum cross-sectional dimension
of a rectangular section shall be at least three times the nominal
maximum size of the coarse aggregate in the concrete as
defined in Terminology C 125. Occasional over-size aggregate
particles (of a size not normally found in the average aggregate
grading) shall be removed by hand picking during the molding
of the specimens. When the concrete contains aggregate larger
than that appropriate for the size of the molds or equipment to
be used, wet-sieve the sample as described in Practice C 172