Austroads: Transport Research and Trends
Government
The use of reclaimed asphalt pavement (RAP) in new asphalt mixes is a common practice in Australia and New Zealand due to its many benefits. RAP contents are typically about 10–20% but higher contents can be used, if the effect of the aged binders present in RAP is accounted for. Rejuvenators can be used to soften the hardened binders which are present in RAP, and are therefore considered an essential component for producing high-content RAP mixes.
Although Australian and New Zealand asphalt producers acknowledge the importance of rejuvenators (in particular when producing high RAP mixes), rejuvenators are not commonly used due to the lack of specifications/guidelines that can evaluate the potential performance of rejuvenators when used in RAP mixes. To address this issue, Austroads has developed a rejuvenator evaluation protocol. In this protocol, rejuvenators are evaluated as part of binder blends, and their short/long-term ageing resistance is assessed to ensure their performance at the production stage as well as during service in the long term.
This webinar with Young Choi, Robert Busuttil and Robert Urquhart presents the proposed protocol and its development work. The development work involved a literature review into international rejuvenator specifications and research studies, in particular those which investigated the effect of rejuvenator properties on the properties/ performance of asphalt binders and mixes.
The development work involved obtaining feedback from Austroads technical group members and international experts. These studies were conducted to ensure that the evaluation protocol is robust and practical.
The webinar also covers a plan for future validation studies which will ensure that the protocol is suitable for use in Australia and New Zealand.
Network Operation Planning: Case Studies and Capability Building
Revision of Austroads Guide to Road Tunnels Part 2: Planning, Design and Commissioning
Engineering Guideline to Bridge Asset Management
Improved Traffic Management Guidance: On-Road Public Transport Priority Tool
Improved Traffic Management Guidance: Freeway Capacity Analysis
Effectiveness and Implementation of Raised Safety Platforms
Pedestrian Planning and Design for Residential Areas
Innovation and Best Practice in Performance Measurement and Transport Outcomes
Road Cross-Section Design for Road Stereotypes and a Safe System
Pedestrian Planning and Design for Activity Centres
Pedestrian Planning and Design at Intersections
Midblock Crossings for Pedestrians
Transitions Between Steel Beam and Concrete Barriers
Road Space Allocation for Pedestrians
Opportunities to Build Capacity in Traffic Management
Development of Design Procedures for Lightly Bound Cemented Materials in Flexible Pavements
Improved Guidance on Interrupted Traffic Flow Theory
Best-Practice Approaches to Road Freight and Communities
Outcomes from the Long-Term Monitoring of Austroads Sprayed Seal Trials
Implications of Pavement Markings for Machine Vision
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