Question: 6 (15 points) Calculate the required layer thicknesses (asphalt concrete, base, and subbase layers) for a new

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Question 6 15 Points Calculate The Required Layer Thicknesses Asphalt Concrete Base And Subbase Layers For A New 1 (105.57 KiB) Viewed 63 times

Question: 6 (15 points) Calculate the required layer thicknesses (asphalt concrete, base, and subbase layers) for a new asphalt concrete pavement on a fair draining base and subgrade. It is estimated that the pavement structure becomes saturated less frequently than 1% of the time. The following data is also given: Estimated number of ESALs over a 12-year maximum performance period = 20.0 million • Subgrade resilient modulus = 12,000 psi • The pavement layer modulus for the subbase = 25,000 psi • The pavement layer modulus for the base = 40,000 psi • Design reliability = 95% • Standard error in predicting serviceability=0.35. • Initial PSI = 4.2 • Terminal PSI = 2.0 Overall standard deviation, S, Design serviceability loss, APSI 50 99.9 107 5.0 HZ 99 1.0 0.5 0.4 0.6 0.5 0.1 0.05 90 80 70 60 50 1.5 2.0 2.5 3.0 1 9 8 7 6 5 4 3 2 6.5 5.5 4.5 3.5 2.5 1.5 Design structural number, SN 1