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Q2. A flexible pavement is to be designed based on AASHTO method. The following are the...

Q2. A flexible pavement is to be designed based on AASHTO method. The following are the characteristics of this pavement: R = 90%, S0 = 0.40, Pi = 4.5, Pt = 2.0, SN = 3.5 and Mr (subgrade) = 15,000 psi. (a) If it was decided to use to a base course and an asphalt layer, what will be the thickness of each if you know that the sub-grade CBR = 8, base course CBR = 85, m = 1.0, surface modulus of elasticity = 400,000 psi. (b) How many years this pavement will approximately last, knowing that the average ESAL per year during the design period is 530 000 repetitions.

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