Innovative asphalt used for Hume Highway rehabilitation

The next stage of the Hume Highway rehabilitation at Marulan will feature a high-strength asphalt instead of concrete, with the new approach aimed at improving the long-term performance of the connection.

The change follows a successful trial of the asphalt on the northbound lanes earlier this year.

Cassandra Ffrench, Executive Director Partnerships and Integration South for Transport for NSW, said the high-strength asphalt gives Transport for NSW the flexibility to work with the existing concrete road surface.

“It allows us to prioritise the sections most in need while opening up more options for future maintenance, including increasing pavement thickness where required,” said Ffrench.

“Although the result may appear patchy initially, it’s a deliberate approach that reduces construction time, limits traffic impacts and provides a stronger, more adaptable foundation for future work.

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“The project also includes upgrading drainage to support the new pavement and its longevity.”

The concrete was originally selected for major routes such as the Hume Highway due to its strength and long life. However, the sub-base and pavement thickness on this section were built to older standards, making ongoing concrete replacement less effective.

“High-strength asphalt offers a faster construction time, as it can be laid and reopened to traffic more quickly than concrete,” she said.

“It also provides greater flexibility for future maintenance, helping ensure a smoother and more efficient travel experience for motorists.

“The high-strength asphalt maintains load capacity even with reduced pavement thickness, allowing this section of highway to transition away from concrete. With more suppliers now producing this material, it’s also become a more cost-effective option for future maintenance.”

For more information, visit: www.transport.nsw.gov.au/