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Your dimensions 3' x 3' x 4" equate to .1 cubic yard. One cu yd of concrete weighs from 2000 to 3500 lbs, depending on the mix. Commercial concrete is around 3200 lbs per cu yd, so your .1 cu yd would weigh 320 lbs.

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15y ago
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Q: How much does a 3'x3'x4 slab of concrete weigh?
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