Pavement
- Publication no: AP-T357-21
- ISBN: 978-1-922382-72-6
- Published: 30 May 2021
- PDF (free) Download
This report documents the technical basis of the 2011 and 2019 editions of Austroads’ Guide to Pavement Technology Part 5: Pavement Evaluation and Treatment Design.
Pavement evaluation and rehabilitation treatment design is an integral part of managing a road network. Some roads require strengthening treatments to carry future traffic.
Austroads has provided guidance on the selection and design of strengthening treatments to rehabilitate pavements for more than 30 years. This report describes the development of methods to design strengthening treatments such as granular overlay, asphalt overlays, inlays and stabilisation treatment for flexible pavements.
Watch the webinar with Dr Michael Moffatt and Dr Geoff Jameson who detail the technical basis for changes made to the Guide.
- Summary
- 1. Introduction
- 1.1 Purpose
- 1.2 Scope
- 1.3 Methodology
- 2. Empirical Design of Granular Overlays
- 2.1 Introduction
- 2.2 Calculation of Characteristic Deflections
- 2.3 Overlay Design Using Traffic Speed Deflectometer Deflections
- 3. Flexible Pavement Treatment Design Using Mechanistic-Empirical Procedure
- 3.1 Introduction
- 3.2 Overview of MEP
- 3.3 Consideration of Strength Variability of Existing Pavements
- 3.4 Back-calculation of In situ Moduli
- 3.4.1 Introduction
- 3.4.2 Austroads Back-calculation Algorithm
- 3.4.3 Considerations of Modulus Variability
- 3.4.4 Adjustment of Isotropic Moduli to Anisotropic Values
- 3.4.5 Guidance on Layer Thicknesses
- 3.5 Determining Design Moduli of Existing Pavement Layers and Subgrade
- 3.5.1 Introduction
- 3.5.2 Subgrade
- 3.5.3 Selected Subgrade Materials
- 3.5.4 Lime-stabilised Subgrade
- 3.5.5 Unbound Granular and Modified Granular Materials
- 3.5.6 Asphalt
- 3.5.7 Cemented Materials and Lean-mix Concrete
- 3.5.8 Foamed Bitumen Stabilised Materials
- 3.6 Determining Design Moduli Foamed Bitumen Stabilised Materials
- 3.6.1 Introduction
- 3.6.2 FBS Modulus Adjustment for Temperature
- 3.6.3 FBS Modulus Adjustment for Rate of Loading
- 3.7 Performance Relationships
- 4. Summary and Conclusions
- References