As a construction services inspection and testing firm, we routinely cast sets of four 6 x 12-inch specimens (2 tested @ 7 and 2 @ 28) and sets of five 4 x 8-inch specimens (1 @ 7, 3 @ 28, 1 to hold). Recently a client questioned why they should pay us to test the 28-day specimens when the 7-day specimen achieved the specified 28-day strength. Can we hang our hat on anything other than ACI 318 184.108.40.206. indicating a valid test requires the average of 3 4x8's, and the loose "7-day tests are purely diagnostic" comment? Thanks!
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