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Re: Spec needed for 3000 psi concrete

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Dennis:
 
Do try not to get sucked in to do the contractors job. If you do he will point the finger at you for all his job problems. I the contractor and/or his superintendent is not qualified inform your client and let him deal with it.  It is not the engineers responsibility to fix job problems that are not his fault.  As far as the mix design, as Nels indicated, let the concrete supplier provide a 3000 psi mix, with cylinder break history.  That way if any problems arise the supplier has to fix them not you. In contractor terms pull you pants over your but and get of the job site.
Sometimes it's the sly contractor who sucks everyone else into his problems and he shares the expenses with your dollars.
 
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA