A flexible pavement is to be designed according to the AASHTO design method. The total expected ESAL for a new highway = 9 x106, APSI= 2, reliability = 99%, overall standard deviation = 0.4, if the pavement layers are: Thickness (inch) Layer Wearing surface Base Subbase 4 4 ? Structural layer coefficient a₁ = 0.44 a2 = 0.14 a30.11 The subgrade resilient modulus=20,000 psi, m2, m3=1, determine the thickness required for the subbase layer?

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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New flexible pavement is designed based on the following condition, use the design chart: 

A flexible pavement is to be designed according to the AASHTO design method. The total
expected ESAL for a new highway = 9 x106, APSI= 2, reliability = 99%, overall standard
deviation = 0.4, if the pavement layers are:
Thickness (inch)
Layer
Wearing surface
Base
Subbase
4
4
?
Structural layer coefficient
a₁ = 0.44
a2 = 0.14
a3 = 0.11
The subgrade resilient modulus=20,000 psi, m2, m3=1, determine the thickness required for the
subbase layer?
Transcribed Image Text:A flexible pavement is to be designed according to the AASHTO design method. The total expected ESAL for a new highway = 9 x106, APSI= 2, reliability = 99%, overall standard deviation = 0.4, if the pavement layers are: Thickness (inch) Layer Wearing surface Base Subbase 4 4 ? Structural layer coefficient a₁ = 0.44 a2 = 0.14 a3 = 0.11 The subgrade resilient modulus=20,000 psi, m2, m3=1, determine the thickness required for the subbase layer?
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