A rigid pavement is designed with a 9 inches slab and a subbase of 10 inches.The seasonal variation of the roadbed soil resilient modulus is given in the table 1, in this table ayear is divided into only four periods.SeasonRoadbed soil modulus MRWinterAutumnSummerSpringMPa207349076Table 1. Laboratory MR resultsThe rock depth is located 5 ft below the subgrade surface.a) Determine the effective resilient modulus of the subgrade.b) Considering a subbase modulus ESB of 15 000 psi, determine the composite modulus ofsubgrade reaction k, by using the chart below and assuming a semi-infinite subgradedepth.PSI30 0005 00013 00011 000 1,000,000600,000400,000200,000100,00075,00050,00030,00015,0001000200030005000700010,00012,00016,00020,000Subbase ElasticModulus, Esa (psi)Subbase Thickness, DSB (inches)+++18 16 14 12 10RoadbedSoil ResilientModulus, MR (psi)760150(Turning Line)Composite Modulus ofSubgrade Reaction,k (pci)(Assumes Semi-infinite SubgradeDepth)200$981000Chart for estimating of subgrade reaction20001500

Sub base= 10 inch slab= 9 inches

A rigid pavement is designed with a 9 inches slab and a subbase of 10 inches. The seasonal variation of the roadbed soil resilient modulus is given in the table 1, in this table a year is divided into only four periods.

A rigid pavement is designed with a 9 inches slab and a subbase of 10 inches. The seasonal variation of the roadbed soil resilient modulus is given in the table 1, in this table a year is divided into only four periods.

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 rigid pavement is designed with a 9 inches slab and a subbase of 10 inches.
The seasonal variation of the roadbed soil resilient modulus is given in the table 1, in this table a
year is divided into only four periods.
Season
Roadbed soil modulus MR
Winter
Autumn
Summer
Spring
MPa
207
34
90
76
Table 1. Laboratory MR results
The rock depth is located 5 ft below the subgrade surface.
a) Determine the effective resilient modulus of the subgrade.
b) Considering a subbase modulus ESB of 15 000 psi, determine the composite modulus of
subgrade reaction k, by using the chart below and assuming a semi-infinite subgrade
depth.
PSI
30 000
5 000
13 000
11 000

1,000,000
600,000
400,000
200,000
100,000
75,000
50,000
30,000
15,000
1000
2000
3000
5000
7000
10,000
12,000
16,000
20,000
Subbase Elastic
Modulus, Esa (psi)
Subbase Thickness, DSB (inches)
+++
18 16 14 12 10
Roadbed
Soil Resilient
Modulus, MR (psi)
7601
50
(Turning Line)
Composite Modulus of
Subgrade Reaction,
k (pci)
(Assumes Semi-
infinite Subgrade
Depth)
200
$98
1000
Chart for estimating of subgrade reaction
2000
1500

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