I'm not too sure about the supposed negative effects of concrete in a BOW. When I was involved in the concrete industry we poured many a bridge job, including footings and pilings, for state projects.
"Forget pounds and ounces, I'm figuring displacement!"
If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.
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