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 - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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