Advancing low carbon concrete in Australian infrastructure: design notes for engineers
Reviewed by Tom Sullivan

First reported on Roads & Infrastructure (AU)
30 Second Briefing
Approval of a 60 per cent Supplementary Cementitious Material (SCM) concrete mix by VicRoads for road and transport projects across Victoria marks a major shift in allowable low-carbon binders for state infrastructure. The mix, developed and trialled with Geoquest Australia, replaces the majority of Portland cement with SCMs such as fly ash and slag, cutting embodied carbon while maintaining performance to VicRoads specifications. Designers and contractors can now specify substantially higher SCM contents on VicRoads projects without seeking project-by-project exemptions.
Technical Brief
- Contractors now avoid project-specific departures, simplifying mix approval workflows and reducing design programme risk.
- Similar state road authorities are expected to reference the VicRoads approach when updating low-carbon concrete standards.
Our Take
VicRoads’ acceptance of mixes with around 60 per cent supplementary cementitious material (SCM) effectively sets a performance benchmark that local councils and other road authorities in Victoria are likely to mirror, accelerating demand for SCM supply chains in the state.
Geoquest Australia’s appearance across several Materials pieces in our database, including on climate‑resilient transport infrastructure, suggests it is positioning as a technical adviser not just on geotechnical risk but on low‑carbon materials specification for Australian road projects.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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