Along with a slump test, also inform the appropriate parties that you are taking test cylinders for compressive strength testing. That usually keeps these outfits straight. From experience of building high rises in NYC, I can tell you any deviation or failure of the approved mix design is a disaster. Funny how when you consider residential work, the formalities of inspection, testing etc. are often skipped.
The mix design will have a specific water to cementitous material ratio, which if you deviate from and add more water than is called for, it will reduce the compressive strength. All the materials which make up a mix design are used in specific amounts, change that and you now have a different mix design, one that may or may not perform as what was called for, only way to find out is testing. That's why 03300 specifications, in division 1-16 usually or most likely call for an existing design, that has been tested and is using specific materials to the area or the batch plant, change any of that and the mix must be tested to prove it performs.
If a more flowable material is desired, its best ordered that way, ie; pump mix for a pump truck, or as called for in the specifications.
Most residential or similar users of this material will order 3000, 4000 psi, and the suppliers rarely hear about any testing unless its a big commercial job, so its good measure to mention the taking of test cylinders, very easy to do, local testing outfit should be helpful in obtaining test cylinders. Take 4 cylinders, fill one at a time, 1/3 at a time with concrete, use a 1/2" steel rod to "rod" that 1/3rd portion, 25x, repeat for the next 2/3rds, rod 25x each 1/3rd, then screed the top off evenly, make sure to mark the date on the cylinder, testing outfits use a metal tag from what I recall, then have a testing outfit break at 7,14,21,28 days. That's typical in commercial work, just an FYI for here though.
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