DG ponders:
>Any civil engineers in the house?
That's me!
>From experience designing roads for New York's DOT - they use 9-10" of
reinforced concrete on 12" of subbase material for major highways - I'd say
you need 6" to 8" of reinforced concrete for what you're proposing (we use
this for concrete pads at truck loading docks at your local Wal-Mart). Keep
the 12" subbase.
One stipulation - I think your assumption that you will use unskilled or
skilled but free labor is a real stretch, considering the magnitude of what
you are proposing, unless you are planning on doing this a section at a time
over the course of 10 years
Using NYSDOT prices (which include all installation costs with union labor
at prevailing wage rates):
640000 SF of concrete pavement @ 6" @ $250 per cubic yard = $2,950,000
640000 SF of reinforcement @ $5/SY = $120,000
640000 CF of subbase @ $15/CY = $350,000
So you're talking $3.5 million without factoring in drainage, survey,
grading, permitting, design costs, etc. Maybe halve that since you're not a
state agency ;-). Or cut it by two-thirds it if you can find your free
labor. ;-) ;-)
Asphalt - you would want at least 8" I would say. This translates to about
11,000 tons of asphalt @ $30 per ton = $330,000. Keep the subbase the same
and your overall cost is much cheaper, but you're still better off buying
the dyno :) :) :)
Hope this helps with your decision!
Brent
(who's really wanting to build a 1/2 mile asphalt kart track suitable for
autocross events on his parents farm)
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