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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fca56f294-9344-4c99-a4c4-baf75a05a77d%2F400c4505-9cc9-4cf7-a6a0-b347c166c588%2Fj62kqqt_processed.jpeg&w=3840&q=75)
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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