The predicted traffic mix of a proposed four-lane urban non-interstate freeway: Passenger cars = 69% Single-unit trucks (two single axles): 2-axle, 5000 lb/axle = 20% 2-axle, 9000 lb/axle = 5% Single trailer trucks (three single axles): 3-axle, 23,000 lb/axle = 4% 3-axle 20,000 lb/axle = 2% The projected AADT (average annual daily traffic) during the first year of operation is 3500. The design period is 20 years and the traffic growth rate is estimated at 4% annually. The resilient modulus of the asphalt (EAC) is 300,000 lb/in. The CBR of subgrade is 80 (the modulus of subgrade is 18,5000 psi). Assume the percent of traffic on the design lane is 42%. Use pt = 2.5, and SN = 3 for the estimation of load equivalency factor and ESAL. Use a reliability level of 90%, standard deviation of 0.45, and APSI of 2.0, determine the asphalt layer thickness of full-depth asphalt pavement using the AASHTO 1993 design method.
The predicted traffic mix of a proposed four-lane urban non-interstate freeway: Passenger cars = 69% Single-unit trucks (two single axles): 2-axle, 5000 lb/axle = 20% 2-axle, 9000 lb/axle = 5% Single trailer trucks (three single axles): 3-axle, 23,000 lb/axle = 4% 3-axle 20,000 lb/axle = 2% The projected AADT (average annual daily traffic) during the first year of operation is 3500. The design period is 20 years and the traffic growth rate is estimated at 4% annually. The resilient modulus of the asphalt (EAC) is 300,000 lb/in. The CBR of subgrade is 80 (the modulus of subgrade is 18,5000 psi). Assume the percent of traffic on the design lane is 42%. Use pt = 2.5, and SN = 3 for the estimation of load equivalency factor and ESAL. Use a reliability level of 90%, standard deviation of 0.45, and APSI of 2.0, determine the asphalt layer thickness of full-depth asphalt pavement using the AASHTO 1993 design method.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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