Design a three layer flexible pavement system using the AASHTO method for the following traffic and pavement properties: 1- Sub-grade soil resilient modulus 2- Granular sub-base resilient modulus M 17,500 Psi 3- Granular base resilient modulus M = 5000 Psi M = 25,000 Psi 4- Bituminous Layer Elastic Modulus EAC 400,000 Psi 5- Initial PSI, P.=4.5, 6- Reliability, R=90%, overall standard deviation, So= 0.35 7- Drainage coefficient for sub-base, ms= 0.8 8- Drainage coefficient for base, m= 0.9 9- Traffic Properties are as follows: Terminal PSI, P, = 2.5 (AADT =9000 v/d), (annual traffic grow th rate (r 4.5%)), (design period 18 years), (traffic percentage on the design lane is (f 35%)), and Traffic proportions: 1- Passenger car (1,000 lb/axle) = 30% 2- Single unit truck with 2 sing le axle (12,000 lb/axle) = 40% 3- Single unit truck with 2 single axle (6,000 lb/axle) And 1 tandem axle (22,000 lb/axle) = 30% Note: upload only the AA SHTO flexible pavement nomograph, and the calculations for the (ESAL) and the pavement layers thicknesses.
Design a three layer flexible pavement system using the AASHTO method for the following traffic and pavement properties: 1- Sub-grade soil resilient modulus 2- Granular sub-base resilient modulus M 17,500 Psi 3- Granular base resilient modulus M = 5000 Psi M = 25,000 Psi 4- Bituminous Layer Elastic Modulus EAC 400,000 Psi 5- Initial PSI, P.=4.5, 6- Reliability, R=90%, overall standard deviation, So= 0.35 7- Drainage coefficient for sub-base, ms= 0.8 8- Drainage coefficient for base, m= 0.9 9- Traffic Properties are as follows: Terminal PSI, P, = 2.5 (AADT =9000 v/d), (annual traffic grow th rate (r 4.5%)), (design period 18 years), (traffic percentage on the design lane is (f 35%)), and Traffic proportions: 1- Passenger car (1,000 lb/axle) = 30% 2- Single unit truck with 2 sing le axle (12,000 lb/axle) = 40% 3- Single unit truck with 2 single axle (6,000 lb/axle) And 1 tandem axle (22,000 lb/axle) = 30% Note: upload only the AA SHTO flexible pavement nomograph, and the calculations for the (ESAL) and the pavement layers thicknesses.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Design a three layer flexible pavement system using the AASHTO method for the
following traffic and pavement properties:
1- Sub-grade soil resilient modulus
2- Granular sub-base resilient modulus M 17,500 Psi
3- Granular base resilient modulus
4- Bituminous Layer Elastic Moduhus EAC 400,000 Psi
5- Initial PSI, P.=4.5,
6- Reliability, R = 90%,
7- Drainage coefficient for sub-base, ms= 0.8
8- Drainage coefficient for base, m2= 0.9
9- Traffic Properties are as follows:
M = 5000 Psi
M = 25,000 Psi
Terminal PSI, P, =2.5
overall standard deviation, S.= 0.35
(AADT =9000 v/d), (annual traffic growth rate (r= 4.5%)), (design period 18 years),
(traffic percentage on the design lane is (fa 35%)), and Traffic proportions:
1- Passenger car (1,000 lb/axle)
= 30%
2- Single unit truck with 2 single axle (12,000 lb/axle)
= 40%
3- Single unit truck with 2 sing le axle (6,000 lb/axle)
And 1 tandem axle (22,000 lb/axle)
= 30%
Note: upload only the AA SHTO flexible pavement nomograph, and the calculations for
the (ESAL) and the pavement layers thicknesses.
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