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1] Determine the Structural Number (SN) for a flexible pavement that will be supported by the following subgrade, base, subbase: az = ? see Chart a3 = ? see Chart CBRbase 70% CBRsubbase 40% CBRsubgrade 1% use Mroadbed soil = 1500 * CBR Mr asphalt (68 deg. F) = 500,000 psi a, = 0.47, or see Chart

1] Determine the Structural Number (SN) for a flexible pavement that will be supported by the following subgrade, base, subbase: az = ? see Chart a3 = ? see Chart CBRbase 70% CBRsubbase 40% CBRsubgrade 1% use Mroadbed soil = 1500 * CBR Mr asphalt (68 deg. F) = 500,000 psi a, = 0.47, or see Chart

Traffic and Highway Engineering
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 13P: Repeat Problem 19-7 using two different depths of untreated aggregate bases of 6 in. and 12 in....
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Given:

Design ESAL = 10 x 106 

Initial serviceability index = 5 

Terminal serviceability =  2

Standard deviation = 0.5

Reliable = 95% 

1] Determine the Structural Number (SN) for a flexible pavement that will be supported by the following subgrade, base, subbase: CBRbase a2 = ? see Chart 70% 40% CBRsubbase CBRsubgrade a3 = ? see Chart 1% use Mroadbed soil = 1500 * CBR Mr asphalt (68 deg. F) = 500,000 psi a, = 0.47, or see Chart The pavement must be of the following characteristics: 95% Reliable Carry a total of 10 x 106 ESALS Standard deviation of 0.5 m2 = m3 = 0.8 Initial and terminal serviceability of 5 and 2, respectively. Determine also the thicknesses of the asphalt concrete, base course, and subbase course. Assume that the thickness of base and subbase are equal, and 3 times that of the asphalt. Round-up your thicknesses to the nearest 2". Screenshot (or take a picture of) your use of flexible pavement nomograph.
Transcribed Image Text:1] Determine the Structural Number (SN) for a flexible pavement that will be supported by the following subgrade, base, subbase: CBRbase a2 = ? see Chart 70% 40% CBRsubbase CBRsubgrade a3 = ? see Chart 1% use Mroadbed soil = 1500 * CBR Mr asphalt (68 deg. F) = 500,000 psi a, = 0.47, or see Chart The pavement must be of the following characteristics: 95% Reliable Carry a total of 10 x 106 ESALS Standard deviation of 0.5 m2 = m3 = 0.8 Initial and terminal serviceability of 5 and 2, respectively. Determine also the thicknesses of the asphalt concrete, base course, and subbase course. Assume that the thickness of base and subbase are equal, and 3 times that of the asphalt. Round-up your thicknesses to the nearest 2". Screenshot (or take a picture of) your use of flexible pavement nomograph.
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ISBN:
9781305156241
Author:
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Publisher:
Cengage Learning
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