Designing the Right Concrete Mix
Using the ACI 211.1 method, here is an abbreviated run-through on how to design a mix:
So you see that after all these fancy calculations, the bottom line is that concrete is still designed by experience with previous mixes or by making trial batches in the lab and testing the concrete. Nothing beats experience with a mix. Many decorative contractors will have 4 or 5 mixes that they use for different applications or weather conditions. If you have these mixes already in your ready mix provider's office, he can quickly pull out the design and you can tell him to bring your mix #3 or #5.
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