Pavement
Review of Relationship to Predict Subgrade Modulus from CBR (California Bearing Ratio)
- Publication no: AP-T130-09
- ISBN: 978-1-921551-23-9
- Published: 25 March 2009
- PDF (free) Download
The Austroads Guide to the Structural Design of Road Pavements: Pavement Design (now the Guide to Pavement Technology: Part 2 – Pavement Structural Design) has been used throughout Australia for over 20 years. Progressive development of the Guide is required to take advantage of improved knowledge and technology and hence improve pavement design procedures. This report includes recent research findings, including those on dynamic loading of pavements; recent developments in overseas design practices, particularly United States of America and South Africa; review design procedures chapter by chapter; identifies a strategy to develop a new Austroads response to load model; and identifies areas where the Guide should be improved.
- Review of Relationship to Predict Subgrade Modulus from CBR (California Bearing Ratio)
- Project Manager
- Austroads membership
- 1. INTRODUCTION
- 2. CURRENT AUSTROADS RELATIONSHIP FOR ESTIMATING SUBGRADE MODULUS FROM SUBGRADE CBR
- 2.1. Development of the Current Austroads Relationship
- 2.2. Lack of Conservatism of the Current Austroads Relationship
- 3. OVERSEAS PRACTICE
- 3.1. Relationships between Subgrade Modulus and Subgrade CBR
- 3.1.1. UK and USA
- 3.1.2. South Africa
- 3.1.3. Comparison of Australian, UK/USA and South African Relationships
- 4. LIMITATIONS OF SUBGRADE MODULUS FROM SUBGRADE CBR RELATIONSHIPS
- 4.1. Dependency of Subgrade Modulus on Subgrade Stress
- 4.2. Variability of the Subgrade Modulus Relationship with Material Type
- 4.3. Dependency of the Subgrade Strain Relationship on Subgrade Modulus
- 5. CONCLUSIONS
- 6. RECOMMENDATIONS
- REFERENCES
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