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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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