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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