Single unit trucks (assume 0.40 ESALs per truck) = 1872/dayĭouble unit trucks (assume 1.00 ESALs per truck) = 1762/day This represents a typical range of reliability levels encountered for Interstate highways. Investigate three levels: R = 90%, R = 95%, R = 99%. M R = 86 MPa (12,500 psi) in the wet months of November through April M R = 103 MPa (15,000 psi) in the dry months of May through October Use E = 3,447 MPa (500,000 psi) Base course: Crushed aggregate with M R= 193 MPa (28,000 psi)Subbase course: None used Surface course: 12.5 mm (0.5 inch) Superpave with E = 3,447 MPa (500,000 psi)Binder course: Dense-graded HMA mix with a nominal maximum aggregate sizeof 25 mm (1 inch). Investigate 20, 30 and 40 year design periods Assume 80% of the loading occurs in the design lane
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