4. A rigid pavement option is being assessed for a rural 6-lane divided expressway (three lanes in each direction). Traf

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4 A Rigid Pavement Option Is Being Assessed For A Rural 6 Lane Divided Expressway Three Lanes In Each Direction Traf 1 (48.14 KiB) Viewed 43 times

4. A rigid pavement option is being assessed for a rural 6-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 24,500 with the following vehicle mix and axle loads. - Passenger cars = 55% - 3-axle single-unit trucks (14,000 lb/axle) = 35% 2-axle single-unit trucks (18,000 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% annually. The modulus of subgrade reaction is 100 lb/in and a 6 in cement-treated subbase is used. The concrete's modulus of rupture is 600 lb/in”. The pavement has no dowel bars and has a concrete shoulder. Use the PCA design method to check if an 8-inch slab is adequate for this pavement assuming that 40% of total truck traffic travels in the design lane.