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 5.6.2.4. 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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7-day vs. 28-day compressive strength tests 3
- Thread starter sapperDAK
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This is simple, you do as your client directs. Express your concerns if they are not following the Specifications or Building Codes. Only do this once, more then that and you will probably not remain their testing firm. They can deal with the Building Officials if the concrete test reports are not accepted.
On a side note, we routinely except 7 day breaks and have never been questioned by a Building Official. However, we fully expect 7 and 28 days breaks when specified.
On a side note, we routinely except 7 day breaks and have never been questioned by a Building Official. However, we fully expect 7 and 28 days breaks when specified.
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