You must have worked in a plant as well, I'm familiar with the other admixtures and so on, but usually the design mix by as specified, by contract documents will incorporate those admixtures, and be submitted for approval by the engineer of record reflecting that in the submitted design mix. Many specifications call for a proven mix design, using specific local materials to that plant, so if a contractor submits that mix design, from that plant its usually approved.
In the residential world, you can get all kinds of variables and situations because people and or contractors don't have enough knowledge of the material.
I do remember all the precast concrete plank I ordered was specified to be 5000 psi.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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