Posted by Billy NY on April 26, 2020 at 12:58:08 from (74.70.87.149):
In Reply to: RE : concrete mixes posted by Ricey06 on April 26, 2020 at 09:51:48:
If you want to really prove the strength of the mix, get 4 concrete test cylinders and fill them properly.
Filling them is as follows: fill 1/3, using a steel rod, tamp 25 times. Repeat for the next 2/3rds. Screed off the top and take to a test lab. Typically 4 are taken for breaks at, 7 day, 14 day, 21 day and 28 days. (Break = test ) It is a way to see in advance, if the concrete is rising to the mix designs compressive strength, as you need to wait 28 days for it to fully cure, after that the strength may still rise, but very very slowly, it's almost irrelevant.
Moisture content, specific gravity etc. etc. all play a role in this, the mix design procedure is reference-able in ASTM. ASTM C39 is for: "Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens"
Reason I mention any of this is because there is a lot that goes into developing and proving a concrete mix design to a certain compressive strength. While the information you may have researched may be a guideline, you have no way of knowing without testing. If someone here or elsewhere got the wrong idea and used it for a critical structural component, an unproven mix design, it could easily fail catastrophically.
The fun part of this material is learning it. I never thought the ASTM or ACI reference material was too difficult to understand and practice, heck we even learned how to calibrate a concrete plant. We designed our mixes, we did all the breaks, made beams and tested those as well from mixes we designed. Prior to creating a mix design, the basis was testing all the aggregate and determining how much of each sieve size was used in the mix.
Now, there is also another way to test in place concrete, it's called a Windsor Probe. Look it up on the web, might be easier, but we typically take test cylinders of the mix before it's placed.
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