A flexible pavement is constructed with 5 inches of sand-mix asphaltic wearing surface (a = 0.35), 9 inches of dense-graded crushed stone base (a = 0.18), and 10 inches of crushed stone subbase (a = 0.11). The base has a drainage coefficient of 0.90 while the subbase drainage coefficient is 1.0. Determine the structural number of the pavement.

A flexible pavement is constructed with 5 inches of sand-mix asphaltic wearing surface (a = 0.35), 9 inches of dense-graded crushed stone base (a = 0.18), and 10 inches of crushed stone subbase (a = 0.11). The base has a drainage coefficient of 0.90 while the subbase drainage coefficient is 1.0. Determine the structural number of the pavement.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter20: Design Of Rigid Pavements

Section: Chapter Questions

Problem 17P

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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.

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