Joe wrote in
:



Steve's right...you're confusing paving asphalt (contains a lot of
gravel aggregate) and roofing asphalt (contains minor amounts of finer
fillers). Next time you drive by a highway surfacing project note the
big dump body trucks lined up there filled with hot mix. No liquids
there.



Then there's "hardtop", which is common in my area on lightly-loaded roads:
You lay down the usual packed-aggregate roadbed, then spray really runny
tar on the surface. Then you spread pea-gravel on top of that, and just let
passing traffic roll it in the rest of the way. Excess gravel gets pushed
off to the shoulder over time. It's fairly durable if you keep heavy trucks
off of it.

--
Tegger