An existing rural four-lane highway is to be replaced by a six-lane divided expressway (three lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads. Passenger cars 50% 2-axle single-unit trucks (12,000 lb/axle) 40% 3-axle single-unit trucks (16,000 lb/axle) 10% The vehicle mix is expected to remain the same throughout the design life of 20 years, although traffic is expected to grow at a rate of 3.5% annually. Using the AASHTO design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years. R 95% So 0.3 Cd 1.0 J 3.2 k 130 Ec 5 106 lb>in.2 S¿ c 650 lb>in.2 Pt 2.5 Pi 4.5
An existing rural four-lane highway is to be replaced by a six-lane divided expressway
(three lanes in each direction). Traffic volume data on the highway indicate that the
AADT (both directions) during the first year of operation is 24,000 with the following
vehicle mix and axle loads.
Passenger cars 50%
2-axle single-unit trucks (12,000 lb/axle) 40%
3-axle single-unit trucks (16,000 lb/axle) 10%
The vehicle mix is expected to remain the same throughout the design life of 20 years,
although traffic is expected to grow at a rate of 3.5% annually. Using the AASHTO
design procedure, determine the minimum depth of concrete pavement required for
the design period of 20 years.
R 95%
So 0.3
Cd 1.0
J 3.2
k 130
Ec 5 106
lb>in.2
S¿
c 650 lb>in.2
Pt 2.5
Pi 4.5
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