highway is to be designed using the AASHTO method to carry a design ESAL of 3 x
Problem No. 1
A flexible pavement for an urban interstate highway is to be designed using the AASHTO
method to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water to
be drained from within the pavement and the pavement structure will be exposed to moisture
levels approaching saturation for 30% of the time. The following additional information is available:
Elastic modulus of asphalt concrete = 450,000 psi
Resilient modulus of base material = 35,000 psi
Resilient modulus of subbase material = 15,000 psi
CBR of subgrade material = 8
(a) Consider designing the same pavement with only asphalt concrete and base layer (excluding subbase layer). Use the information provided in Problem 1.
(b) Compare strengths and weaknesses of each design.
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