Question: As the pavement design engineer you are given the task of constructing a flexible pavement for a five-mile project. The following resilient modulus values were

As the pavement design engineer you are given the task of constructing a flexible pavement for a five-mile project. The following resilient modulus values were obtained for the subgrade on this project: 6500 psi, 5300, 3750, 2900, 3850, 3700, 5200, 2500, 4100, and 3850. What is the subgrade resilient modulus for this material? If this highway were to be constructed in central Illinois, what effective subgrade modulus would you use for the empirical AASHTO design? If you wanted to increase the reliability in empirical AASHTO pavement design, how would you change this effective resilient modulus value?

Suppose you were to design a conventional flexible pavement for a high volume urban expressway/freeway by the Asphalt Institute method. What resilient modulus value would you use in their procedure? You are given 10 million ESALs for the design traffic and a mean annual air temperature (MAAT) of about 60oF, no expansive clay or frost heave is expected, and the pavement to be constructed will be a high volume urban expressway/freeway. Design a pavement by the empirical AASHTO and Asphalt Institute procedures.

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To solve this problem we will approach it stepbystep First we will calculate the subgrade resilient modulus and then determine the effective subgrade modulus for the empirical AASHTO design Finally we ... View full answer

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