Placing two inches of compacted sand over broken concrete is used for
airfield reconstruction. The sand can be 100% compact by flooding with
water .


"Zen Cohen" wrote in message
.. .
I have a very old 18' x 12' garage (really just a storage bldg now) with a
badly cracked slab. A concrete contractor said that he could but a layer
of
sand over the old slab and put a new 4" reinforced concrete slab over
that.
I won't be using the bldg for anything heavier than a motorcycle and don't
want to spend very much rehabbing this old thing (bid is $1400). He said
this method is common and pretty reliable. Any comments? Thanks.