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posted by  hornesa on 11/4/2009 7:59:09 PM  |  status: Live  |  Earned Karma: 25

Unit Weight of a Structure

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Civil Engineering N/A N/A N/A 11/6/2009 at 10:00:00 AM
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I was given a problem by my professor , he asked what the unit weight of a typical structure was. I know that the unit weight of concrete is around 150pcf, and the unit weight of air is around 7.5*10^-2pcf. But I don't know the proportion of air to concrete in a typical structure. If anyone can help, no calculations are necessary, however if anyone knows a rough approximation will do. Thanks.
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posted by Mobiusdick on 11/6/2009 1:01:35 AM  |  status: Live
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I'd approximate that for an average room in a large structure, you probably have a volume concrete to air ratio of .573. this was assuming mostly 20*20 sq. ft rooms and 10 ft ceilings. Thickness for the surrounding concrete was estimated at a foot thickness for all walls, 18 inches for floors and ceilings.
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