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Design of Flexible Pavement(Guide to Pavement Technology Part 2:Pavement
Structural Design Austroads)
First Published 2008, Updated : Feb 2010
a.k.a NAASRA (National Association of
Australian State Road Authorities), 1979
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Overview Austroads is the association of State, Territory, and
Federal Road and traffic authorities in Australia. It
was established in 1989 to replace NAASRA (National
Association of Australian State Road Authorities)
Austroads published A Guide to the Structural Design
of Road Pavement in 1992, renewed May 2008, last
updated Feb 2010)
This Guide based on Analytical Approach in
Pavement Design
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Guide to Pavement Technology
by Austroads
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Pavement Design System by Austroads
(Chapter Framework)
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Project Reliability (Chapter 2)
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Environment Moisture Environment
The stiffness/strength of unbound materials and subgrades isheavily dependent on the moisture content of the materials.
The moisture condition in unbound granular pavement materials
can also have a major effect on performance. When the degree ofsaturation of unbound granular materials exceeds about 70% thematerial can experience significant loss of strength/stiffness
Temperature Environment
For pavement design, the temperature of asphalt can becharacterized in terms of the Weighted Mean Annual PavementTemperature (WMAPT). The WMAPT takes into account therelationship between asphalt temperature and fatigue life ofthick asphalt pavement, published by SHELL in 1978. Calculationof WMAPT can be seen in Appendix B.
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Procedure to calculate WMAPT
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Sample WMAPT in Australia Region
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Subgrade Evaluation
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Presumptive value of CBR
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Subgrade Strain Criterion
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Flexible Pavement Material
Unbound Granular Material
Modified Granular Materials
Cemented Material
Asphalt
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Pavement Material Category
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Unbound Granular Material
Consist of gravelor crushed rockswhich
have a grading that makes them
mechanically stable Characterization : Modulus Elastic and
Poisson ratio (assumed : 0.35)
Properties : Cross Anisotropic
Presumptive value : Table 6.3
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Presumptive Value of Elastic
Parameter of Unbound Granular
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Modified Granular Material
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Cemented Material
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Presumptive Values
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Fatigue Criteria
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Asphalt
Combination of bitumen and aggregates
which are mixed together, spread, and
compacted while hot to form pavement layer Characterization : Modulus Elastic and
Poisson ratio, can be determined by
Laboratory (UMATTA) or nomograph (Figure
6.7)
Properties : Isotropic
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Modulus of Asphalt (Australian
Typical)
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Fatigue Criteria
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Design Traffic
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Design New Flexible Pavement
There are two option :
Mechanistic Procedure
Using CHARTS, see the catalogue in Table 8.4 3 Layers
Granular Base (EC01 to EC03)
Cemented Base (EC07 to EC18)
2 Layers Full Depth Asphalt (EC04 to EC06)
4 Layers (EC19 to EC24)
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Pavement Structure Model
Model of Pavement Loading
-Dual Wheel
-Uniform Circular Loading
-Spacing 330mm center to center
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Two Layers (Full Depth Asphalt)
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Three Layer (Unbound Granular
Based)
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Three Layers (Cemented Base)
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Four Layers
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Mechanistic Procedure
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CIRCLY Output
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CIRCLY Output
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CIRCLY Output
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