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Proposed Procedures for the Design of Pavements on Selected Subgrade and Lime Stabilised Subgrade Materials

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Publication no: AP-R435-13 Pages: 49

The report reviews current Australian and selected international structural design methods for pavements on lime-stabilised subgrade layers.  Research to investigate in-service strength and modulus of lime-stabilised materials is also summarised.  The report proposes design methods for inclusion in the Austroads Guide to Pavement Technology Part 2: Pavement Structural Design.  It is anticipated that these draft procedures will be used by practitioners and revised as necessary for inclusion in the next edition of the Guide.


Table of Contents

1 Introduction
  • 1.1 Background
  • 1.2 Scope
2 Review of Pavement Design Methods for Flexible Pavements which include Lime-stabilised Subgrade
  • 2.1 Introduction
  • 2.2 United States of America
  • 2.2.1 AASHTO MEPDG
  • 2.2.2 Texas Department of Transportation
  • 2.2.3 Florida Department of Transportation
  • 2.2.4 Illinois Department of Transportation
  • 2.3 UK Design Method
  • 2.4 French Design Method
  • 2.5 Australian Design Methods
  • 2.5.1 Queensland Department of Transport and Main Roads Design Methods
  • 2.5.2 VicRoads Design Methods
  • 2.5.3 Roads and Maritime Services NSW Design Methods
  • 2.5.4 Department of Planning, Transport and Infrastructure South Australia
  • 2.5.5 Main Roads Western Australia
3 Proposed Austroads Mechanistic Design Procedures
  • 3.1 Introduction
  • 3.2 Scope of Proposed Design Method
  • 3.3 Maximum CBR and Modulus of Lime-stabilised Subgrade
  • 3.3.1 Measure of Subgrade Support
  • 3.3.2 Determination of Modulus from CBR
  • 3.4 Variation in Modulus with Underlying Support
  • 3.4.1 Current Characterisation of Selected Subgrade Materials
  • 3.4.2 Proposed Characterisation of Lime-stabilised Subgrade Materials
  • 3.5 Proposed Method
4 Proposed Austroads Empirical Design Method
  • 4.1 Introduction
  • 4.2 Proposed Guidance on use for Pavements with Selected Subgrade or Stabilised Subgrade Materials
5 Conclusions
References
Appendix A Revised Text Sections 5.1 and 5.3.8
  • 5.1 General
Appendix B Revised Text Section 8.2
  • 8.2 Mechanistic Procedure
Appendix C Revised Text of Section 8.3
  • 8.3 Empirical Design of Granular Pavements with Thin Bituminous Surfacing
Appendix D Revised Text of Section 12.8.2
  • Determination of basic thickness
  • Pavement composition
Appendix E Revised Text of Appendix K of Part 2
  • K.1 Example 1: Utilising Unbound Granular Materials
  • K.2 Example 2: Utilising Crushed Rocks and Selected Subgrade Materials
  • Step 1 Trial selected subgrade thickness
  • Step 2 Design CBR of selected subgrade
  • Step 3 Select granular material types and thicknesses
  • Step 4 Check whether the total thickness of cover over in situ subgrade is adequate
  • Step 5 Increase selected subgrade thickness and repeat steps 1 to 4
  • K.3 Example 3: Utilising Crushed Rocks and Lime-stabilised Subgrade Materials
  • Step 1 Trial stabilised subgrade thickness
  • Step 2 Design CBR of stabilised subgrade
  • Step 3 Select granular material types and thicknesses
  • Step 4 Check whether the total thickness of cover over in situ subgrade is adequate

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