Pavement
- Publication no: AP-T354-20
- ISBN: 978-1-922382-27-6
- Published: 25 September 2020
- PDF (free) Download
This report presents the findings of site inspections and binder ageing performance studies associated with two Austroads sprayed seal trial sites constructed near Coober Pedy, South Australia and Cooma, New South Wales. These trials were established to evaluate the relative performance of various grades of polymer modified binders (PMBs). After eight years of life, all trial sections of the Coober Pedy site were showing similar, satisfactory performance. Further monitoring of the Coober Pedy site is required so that variations in the performance of the different binders can be observed. The Cooma site showed signs of severe distress in several sections after six years of life, which led to resealing of the entire site.
Changes in the surface texture depth of the seals at Coober Pedy and Cooma during service were investigated. This information was used to validate a new seal voids parameter.
Various rheological and chemical tests were conducted on the trial binders. All binders showed complex property changes on ageing. More complex rheological tests (e.g. repeated loading tests) appear to be needed to develop a durability performance test for PMBs in the Austroads PMB specification (ATS3110).
- Summary
- 1. Introduction
- 1.1 Purpose
- 1.2 Scope
- 1.3 Methodology
- 2. Trial Site Details
- 2.1 Coober Pedy Trial Site
- 2.1.1 Location
- 2.1.2 Climatic Conditions
- 2.1.3 Traffic Count
- 2.1.4 Site Details
- 2.2 Cooma Trial Site
- 2.2.1 Location
- 2.2.2 Climatic Conditions
- 2.2.3 Traffic Count
- 2.2.4 Site Details
- 2.1 Coober Pedy Trial Site
- 3. Inspections of Trials
- 3.1 Introduction
- 3.2 Coober Pedy Seal Performance by Visual Assessments
- 3.2.1 Sections A1 and A2 – C170 (Control)
- 3.2.2 Sections B1 and B2 – S10E
- 3.2.3 Sections C1 and C2 – S20E
- 3.2.4 Sections D1 and D2 – S35E
- 3.2.5 Sections E1 and E2 – Shell S5E
- 3.2.6 Sections F1 and F2 – S45R
- 3.2.7 Sections G1 and G2 – S15E
- 3.2.8 Sections H1 and H2 – SAMI S20E SS
- 3.3 Cooma Seal Performance by Visual Assessments
- 3.3.1 Section A – S10E
- 3.3.2 Section B – S35E
- 3.3.3 Section C – S15E
- 3.3.4 Section D – S15RF
- 3.3.5 Section E – S20E
- 3.3.6 Section F (Northbound) – Fulton Hogan Surfix 70X
- 3.3.7 Section F (Southbound) – SAMI Samiflex E40HR
- 3.3.8 Section G – C170 (Control)
- 3.3.9 Section H (Southbound) – SAMI Polyseal HR
- 3.4 Discussion on Visual Assessment Results
- 3.4.1 Coober Pedy
- 3.4.2 Cooma
- 4. Crack Mapping of Seals
- 4.1 Coober Pedy
- 4.2 Cooma
- 5. Surface Texture Depth Measurements
- 5.1 Validation of a New Seal Voids Parameter for Seal Design
- 6. Investigation into the Ageing Properties of Binders
- 7. Stress Ratio Test Properties of Binders
- 7.1 Introduction
- 7.2 Stress Ratio Test Results
- 7.2.1 Stress Ratio Tests on the Aged Coober Pedy C170 and S15E Binders
- 7.3 Effect of Ageing on the Stress Ratio Properties of Binders
- 7.4 Effect of Ageing on the Stress at 3 Strain Properties of Binders
- 8. Fourier Transform Infrared Spectroscopy
- 8.1 Introduction
- 8.2 Effect of Ageing on Carbonyl Peak Intensity
- 9. Shell Sliding Plate Viscosity of Bitumen
- 10. Discussion on Ageing Performance of Binders
- 11. Summary and Conclusions
- References
- Appendix A Site Inspection Data
- A.1 Inspection Rating Index Guidelines
- A.1.1 Cracking
- A.1.2 Aggregate performance
- A.2 Coober Pedy Inspection Rating
- A.3 Cooma Inspection Rating
- A.1 Inspection Rating Index Guidelines
- Appendix B Cooma Crack Map Photographs
- B.1 Section A Crack Maps
- B.2 Section B Crack Maps
- B.3 Section C Crack Maps
- B.4 Section D Crack Maps
- B.5 Section E Crack Maps
- B.6 Section F Northbound Crack Maps
- B.7 Section G Crack Maps
- Appendix C Stress Ratio Test Results
- Appendix D FTIR Chemical Assignments
- Appendix E FTIR Spectroscopy Results