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Jul 31, 2018018332The weaker the subgrade, or the heavier the loads, then, the thicker the slab needs to be. Concrete strength also comes into play, but most slab concrete is around 3000 to 4000 psi, so its not a major factor. The tensile strength of concrete is typically taken as 10 to 15 of the compressive strength, so only about 400 or 500 psi..
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