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reusing concrete chunks for new slab?

 
Posts: 74
Location: Portland, OR
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can anyone think of a reason why one shouldnt reuse urbanite chunks as filler when casting a new slab of the stuff?
 
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Location: Conroe, Tx
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Cold joints.
 
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You can use it like giant solid concrete block but not as a filler to reduce the concrete volume.  I am not certain how you would tie all of the reinforcement together.  If you were planning on stacking it with a really cement rich mortar it would be ok but I agree the biggest problem is cold joints. 
 
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