A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material coefficient = 0.4), 10 inches of granular base (material coefficient 0.11 and resilient modulus = 22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus = 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9 and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard deviation is 0.45, P; = 4.5 and P= 2.5. Determine the maximum 18,000 lb ESAL applications that can be carried safely by this pavement structure. %3D %3D %3D %3D %3D

A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material coefficient = 0.4), 10 inches of granular base (material coefficient 0.11 and resilient modulus = 22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus = 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9 and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard deviation is 0.45, P; = 4.5 and P= 2.5. Determine the maximum 18,000 lb ESAL applications that can be carried safely by this pavement structure. %3D %3D %3D %3D %3D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design of pavements

Pavement is a structure that is made up of different layers such as sub-base course layer, base course layer, binder course, and a surface course formed with different materials such as gravel, above the subgrade soil constructed to act as a path or carriageway enabling the movement of vehicles. The surface of the pavement should possess characteristics such as adequate friction, light reflection, and drainage. The pavements are classified based on structural design into rigid pavements, flexible pavements, composite pavements, and unpaved pavements. The process of determining a suitable pavement type, its constituent layers, and its thickness is called pavement design.

Question

A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material
coefficient = 0.4), 10 inches of granular base (material coefficient = 0.11 and resilient modulus =
22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus
= 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9
and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard
deviation is 0.45, P; = 4.5 and P = 2.5. Determine the maximum 18,000 lb ESAL applications that
can be carried safely by this pavement structure.

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The design equations for flexible pavements were determined as a result of laboratory experiments. True False
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