I recently ran across a City street standard requiring 5000 psi concrete strength in 28 days. My recollection of the AASHTO Road Studies indicated that the purpose of pavement is to shed water and transfer wheel loads to the subgrade. I seems to recall that there isn't much difference in load transfer between 3000 psi pavement and 5000 psi pavement for a given depth of pavement. Wouldn't this City be better off requiring additional depth of concrete rather than the high strength? Or better yet, putting the additional cost of cement in the improvement of the sub-grade?
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