A flexible pavement is constructed with 7 inches of sand-mix asphaltic wearing surface, 6 inches of dense-graded crushed stone base, and 10 inches of crushed stone subbase. The base has a drainage coefficient of 0.68 while the subbase drainage coefficient is 5. Determine the structural number of the pavement. (round your answer to the two decimal places)

A flexible pavement is constructed with 7 inches of sand-mix asphaltic wearing surface, 6 inches of dense-graded crushed stone base, and 10 inches of crushed stone subbase. The base has a drainage coefficient of 0.68 while the subbase drainage coefficient is 5. Determine the structural number of the pavement. (round your answer to the two decimal places)

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 16P

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A flexible pavement is to be designed to last 10 years. The initial PSI is 4.2 and the TSI (the final PSI) is determined to be 2.5. The subgrade has a soil resilient modulus of 15,000 lb/in². Reliability is 95% with an overall standard deviation of 0.35. For design, the daily car, pickup truck and light van traffic is 40,000 and the daily truck traffic consists of 1500 passes of single-unit trucks with two single axles and 325 passes of tractor semi-trailer trucks with single, tandem, and triple axles. The axle weights are: Cars, pickups, light vans = two 2 kip single axles Single-unit truck = 8 kip single axle and 24 kip single axle Tractor semi-trailer truck = 10 kip single axle, 18 kip tandem axle, and 42 kip triple axle. ● ● M₂ and M3 are equal to 1 for the materials in the pavement structure. Four inches of hot- mix asphalt (HMA) is to be used as the wearing surface and 10 inches of crushed stone as the subbase. Determine the thickness required for the base if soil cement is the…
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4- Describe the characteristics and functions of the top layer in a pavement system.
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A flexible pavement is to be constructed with a inches of sand-mix asphaltic wearing surface, b inches of emulsion/aggregate-bituminous base, c inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. What values of a, b, and c will NOT satisfy SN deign value of 4.1. О a. 5, 9, O b. 2, 9, О с. 5, 8, O d. 5, 7, О е. 3, 8, O f. 4, 7, O g. 4, 9, O h. 3, 9, O i. 3, 7, O j. 6, 8, and 9 and 9 and 9 and 9 and 10 and 10 and 9 and 10 and and 10 10