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Meanwhile, back in the cement-sack warehouse, these guys are still piling it on. Columbus, Georgia, circa 1955. 4x5 inch acetate negative from the News Photo Archive. View full size.
... are "mixed up and set in their ways."
Why was 94 pounds the standard weight for a bag of cement? Because that's the weight of one cubic foot of dry cement.
That makes it easy to state concrete "recipes" in terms of volume because sand and rock were more easily measured by volume than by weight. The water/cement ratio is the critical factor but there, again, a gallon is easier to measure on a jobsite by volume than by weight.
About a month ago I helped a friend pour a concrete pathway to his front door. He was the on-his-knees guy, I was the wheelbarrow guy, and my 25-year-old son was the mixing guy. Over the course of the afternoon, my son heaved 67 bags (lifted and poured into mixer), each one 66 pounds (30 kg), so that’s 4,422 pounds = over two tons. Thank goodness for youth.
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