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.
National Walking and Cycling Participation Survey 2021
Inclusion of Recent Road Safety Research in the Guide to Road Design
Introducing Austroads’ New Road Safety Auditing Guidance
Use of Road-grade Recycled Plastics for Sustainable Asphalt Pavements Part 2
Use of Road-grade Recycled Plastics for Sustainable Asphalt Pavements Part 1
Road Authority Data for Connected and Automated Vehicles
Guide to Road Tunnels Part 2 Update: Rationalising Network Signage for Over-height Vehicles
New Direction for AusRAP – Austroads leadership of Australian Road Assessment Program
Strategic Review of the Guide to Traffic Management
New Pathway for the Implementation of Nationally Harmonised Temporary Traffic Management Practice
Cycling for Sustainable Cities
Investigation of Pavement Assessment Methodologies for PBS Access
National Specification for Crumb Rubber Binders in Asphalt and Seals
Data to Support the Heavy Vehicle Road Reform
Evaluating the Rutting Performance of Binders
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Review of the Guide to Road Safety and Structure for Online Access: Part 7
Review of the Guide to Road Safety and Structure for Online Access
Use of Recycled Plastics in Road Surfacing
Technical Basis of Changes to Guide to Pavement Technology
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