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Tim Foster gravatar image
RedR

Hi Lloyd. While the mix ratios are important for strength, so is the quality of the sand, aggregate and cement. Dirty sand, weak aggregate and low quality cement will all weaken a mix. The quantity of water is also very important, see comments above. Peter Stern suggesty 1;2:4 mixes for slabs without giving any strength. You mention 3,500 psi but do not say whether this is working or ultimate strength - and I assume compressive load... Please advise