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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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