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asphalt/black top requires a machine to lay it HOT
AND BE ROLLED BY AN OTHER MACHINE
and is oil based
both machines may have a problem with your wood border
I suspect concrete is cheaper
as no machines or operators needed
other then the delivery truck
and a 2x4 to level the top
but steel rebar is needed and extra cost over the concrete
no idea if clay is decent for subgrade
as we do not have clay in S Fl
but it needs to be dry and very compacted
we use 6'' of crushed rock over sand
well rolled and compacted
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