All the jobs I worked on, a pump mix design is submitted for approval, whether it has admixtures, or lower slump, the compressive strength has to meet the specifications for the job, test cylinders are to be taken, said contractor will know this up front, if the mix design fails, they eat it. Adding water to any great extent in the field is not something I like to see.
Regardless, you tell a contractor that each pour or every so many yards, test cylinders will be taken, in addition to their responsibility for the material attaining its specified strength, as per a contract, you usually don't get any problems, can still happen, but they know not to fool with it, eyes are on them.
There's a bunch of admixtures out there, modern mix designs for all kinds of purposes, like I've said before, and has been said by others here as well, that W/C ratio is key, you can't deviate very much from it and still get the intended results.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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