Pavement
- Publication no: AP-T225-13
- ISBN: 978-1-921991-73-8
- Published: 17 January 2013
- PDF (free) Download
This report presents the results of a laboratory study to investigate development of a new durability test method that is acceptable for use in Australia. The study aimed to develop a more robust long-term ageing test method and resolve the issues associated with the current Australian durability test method which include equipment sustainability and testing time duration.
Research into the development of a new durability test included the use of two new devices (the Pressure Ageing Vessel (PAV) and the Dynamic Shear Rheometer (DSR)). The PAV was found to be an ideal alternative device to the ageing oven used in the current durability test method. It appears the DSR is a suitable replacement for the Shell sliding plate micro-viscometer used in the current durability test. During this study an Australian PAV ageing protocol was developed for bitumen binders. Preliminary experiments were also conducted to investigate the visco-elastic property changes that occurred when PMB binders were subjected to the Australian PAV ageing protocol.
- 1. Introduction
- 1.1. Long-term Ageing Test: Need for a Better Test Method
- 1.2. Preliminary Review of Overseas Test Methods
- 1.3. Objectives
- 2. Review of Pressure Ageing Vessel (PAV) Test
- 2.1. Acceleration Methods for Long-term Ageing
- 2.2. Introduction to the PAV Test Method
- 2.2.1. UK HiPAT Procedure
- 3. PAV Test: Preliminary Investigation
- 3.1. PAV Ageing Trial
- 3.2. Prediction of Field Ageing
- 3.3. Modifications to Increase the Ageing Level
- 3.4. Preliminary Investigation on PAV: Discussion
- 4. Optimisation of THE PAV method for Sprayed Sealing Binders
- 4.1. PAV Tests with Varying Conditions
- 4.1.1. Binder Film Thickness
- 4.1.2. Stirring of Samples during the Ageing Process
- 4.1.3. Use of RTFO Pre-treatment
- 4.2. PAV Test with Varying Conditions: Results
- 5. PAV and Durability Tests
- 5.1. PAV Test of Binders with Varying Durability
- 5.2. Correlations between Durability Test Results and Post-PAV Viscosity Results
- 6. Shell Sliding Plate Micro-viscometer and DSR
- 6.1. Review of the Shell Sliding Plate Micro-viscometer and the DSR
- 6.2. DSR to Replicate the Shell Sliding Plate Micro-viscometer
- 6.3. Shell Sliding Micro-viscometer and DSR: Discussion
- 7. Review of a Conventional DSR Parameter
- 8. PAV Ageing of PMBs
- 8.1. Ageing of PMBs: Initial Study
- 8.1.1. Sample Preparation of PMBs
- 8.1.2. Segregation of PMBs
- 8.2. Visco-elastic Properties after the Ageing Process
- 8.3. Ageing of PMBs: Discussion
- 9. Conclusions
- References