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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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