Q1A flexible pavement was designed for a 12-year design life with the following daily traffic:1300 single axles at 8,000 lb each900 tandem axles at 15,000 lb each20 single axles at 40,000 lb each200 tandem axles at 40,000 lb eachThe highway section consists of 4 inches of hot-mix asphalt wearing surface (aj = 0.41), 4 inches of granular base(a2 = 0.34), and 8 inches of crushed stone subbase (a3 = 0.10). The reliability was 70%, overall standard deviationwas 0.5, APSI was 2.0 (with a Pt 2.5), and all drainage coefficients were 0.75. What was the soil resilientmodulus of the subgrade used in design? (Use AASHTO equation).

Answered: A flexible pavement was designed for a…

A flexible pavement was designed for a 12-year design life with the following daily traffic: 1300 single axles at 8,000 lb each 900 tandem axles at 15,000 lb each

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

Q1
A flexible pavement was designed for a 12-year design life with the following daily traffic:
1300 single axles at 8,000 lb each
900 tandem axles at 15,000 lb each
20 single axles at 40,000 lb each
200 tandem axles at 40,000 lb each
The highway section consists of 4 inches of hot-mix asphalt wearing surface (aj = 0.41), 4 inches of granular base
(a2 = 0.34), and 8 inches of crushed stone subbase (a3 = 0.10). The reliability was 70%, overall standard deviation
was 0.5, APSI was 2.0 (with a Pt 2.5), and all drainage coefficients were 0.75. What was the soil resilient
modulus of the subgrade used in design? (Use AASHTO equation).

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