The predicted traffic mix of a proposed 4-lane urban non-interstate freeway is: Passenger cars = 78% Single Unit Trucks: 2-axle 22.2 kN/axle =12% 2-axle 39.9 kN/axle =4% 3-axle or more 102 kN/axle =3% Tractor semitrailers and combinations: 3-axle 88.8kN/axle = 3% The projected AADT during the first year of operation is 3900 (both directions). If the traffic growth rate is 3%, and CBR of the subgrade is 7.5%, determine the depth of a full-asphalt pavement using the AASHTO (1993) method and design life of the pavement is 20 years. The resilient modulus of asphalt is 2206 MPa. Assume the mi of subgrade is 1, and percent of traffic on the design line is 42%. Initial serviceability index is 4.5, terminal present serviceability index is 2.5, and SN=4. Use a reliability of 90%, a standard deviation of 0.45. NOTE: All the steps that are followed during the design must be shown and explained clearly. Only number without explanations will not get any credit.
The predicted traffic mix of a proposed 4-lane urban non-interstate freeway is: Passenger cars = 78%
Single Unit Trucks:
2-axle 22.2 kN/axle =12%
2-axle 39.9 kN/axle =4%
3-axle or more 102 kN/axle =3% Tractor semitrailers and combinations: 3-axle 88.8kN/axle = 3%
The projected AADT during the first year of operation is 3900 (both directions). If the traffic growth rate is 3%, and CBR of the subgrade is 7.5%, determine the depth of a full-asphalt pavement using the AASHTO (1993) method and design life of the pavement is 20 years. The resilient modulus of asphalt is 2206 MPa. Assume the mi of subgrade is 1, and percent of traffic on the design line is 42%. Initial serviceability index is 4.5, terminal present serviceability index is 2.5, and SN=4. Use a reliability of 90%, a standard deviation of 0.45.
NOTE: All the steps that are followed during the design must be shown and explained clearly. Only number without explanations will not get any credit.
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