A flexible pavement was initially designed with 2 inches of sand-mix asphaltic wearing surface, 9 inches of dense-graded crushed stone base, 8 inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. If pavement is designed for 54-kip tandem axles vehicles, by how much daily traffic can be increased if wearing layer will be increased by 3 inches. State your answer in % in a form 00.00%. Round SN value to the nearest integer.

A flexible pavement was initially designed with 2 inches of sand-mix asphaltic wearing surface, 9 inches of dense-graded crushed stone base, 8 inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. If pavement is designed for 54-kip tandem axles vehicles, by how much daily traffic can be increased if wearing layer will be increased by 3 inches. State your answer in % in a form 00.00%. Round SN value to the nearest integer.

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 was initially designed with 2 inches of sand-mix asphaltic wearing surface, 9 inches of dense-graded crushed stone base, 8
inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. If pavement is
designed for 54-kip tandem axles vehicles, by how much daily traffic can be increased if wearing layer will be increased by 3 inches. State your
answer in % in a form 00.00%. Round SN value to the nearest integer.

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A flexible pavement has the following class loads during a particular hour of the day. i. ii. 80 buses with 2-axles (each axle load of 40 kN) ; ii. 160 trucks with 2-axles (from and rear axle loads of 40 kN and 80 kN, respectively) Find the equivalent standard axle load repetitions for this vehicle combination as per IRC 37-2012.
12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be allowed on this road for a 20-year analysis period?a. 10b. 33c. 100d. 1490
The data given below pertain to the design of a flexible pavement. Initial trafic = 1213 cvpd Traffic growth rate = 8 percent per annum Design life = 12 years Vehicle damage factor = 2.5 Distribution factor = 1.0 The design traffic in terms of million standard axles (msa) to be catered would be
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