Pavement
- Publication no: AGPT04J-25
- ISBN: 978-1-922994-86-8
- Published: 4 September 2025
- Edition: 2.0
- PDF (free) Download
Guide to Pavement Technology Part 4J provides guidance on the selection, classification, specification, and assessment of source rock and aggregates used in pavement construction. It outlines the geological and engineering characteristics that influence the durability and performance of crushed rock products and presents approaches to quality assurance testing aligned with industry practice.
The Guide reflects Australasian practice and supports the consistent specification of materials across jurisdictions, acknowledging local variation in geology, test methods and agency requirements. It covers igneous, sedimentary, metamorphic and recycled materials, including industrial slags, and details the distress mechanisms that affect rock performance in service.
By incorporating advances in durability assessment and aligning with national standards, this edition provides a practical resource for transport agencies, quarry operators, designers and engineers working to ensure the long-term integrity of road infrastructure.
Edition 2.0 includes:
- improved clarity, terminology, and formatting
- additional guidance related to the use of recycled materials, including industrial slag
- updates to references, including Australian Standards test references, with expanded commentary on slag testing
- expanded guidance on testing procedures.
- 1. Introduction
- 1.1 Scope
- 2. Classification and Description of Source Rocks
- 2.1 Introduction
- 2.2 Igneous rocks
- 2.3 Sedimentary rocks
- 2.4 Metamorphic rocks
- 2.5 Natural sands and gravels
- 2.6 Recycled material sources
- 2.6.1 Industrial slag
- 3. Properties Requiring Specification
- 3.1 Introduction
- 3.2 Rock distress mechanisms
- 3.3 Durability
- 3.4 Developments in durability assessment
- 3.5 Types and descriptions of durability tests
- 3.5.1 Wet/Dry strength Variation
- 3.5.2 Los Angeles Value
- 3.5.3 Sulphate Soundness Loss
- 3.5.4 Degradation Factor
- 3.5.5 Accelerated Soundness Index
- 3.5.6 Secondary Mineral Content
- 3.5.7 Unsound Stone Content
- 3.5.8 Alkali Reactivity
- 3.5.9 Weathering Quality Index for Coarse Aggregate
- 3.6 Approaches to durability control
- 3.7 Specification of durability
- 3.7.1 Uniform sources
- 3.7.2 Durability changes with product size
- 3.7.3 Blended materials
- 3.7.4 Non-uniform sources
- 3.7.5 Recycled materials
- 4. Quality Assessment
- 4.1 Assessment of rock source
- 4.2 Sampling
- 4.3 Testing
- References