As part of the M1 Pacific Motorway extension between Tomago and Raymond Terrace, Boral recently completed a field trial of its low carbon calcined clay concrete on the John Holland–Gamuda JV project. 

The trial formed part of Boral’s broader program to reduce embodied carbon in concrete by partially replacing cement with locally sourced calcined clay, while maintaining performance expected for major infrastructure applications.

The trial involved batching and placing calcined clay concrete on site in live conditions, allowing workability, finishing and performance to be assessed at scale. On the day, the concrete was reported to place and finish well, performing comparably to conventional supplementary cementitious material blends. 

Importantly, the trial demonstrated that calcined clay concrete can be successfully produced, delivered and finished at scale, supporting its future use on major road projects where reduced embodied carbon is an increasing priority. 

This on‑site milestone builds on years of laboratory testing and earlier feasibility trials and represents another step in Boral’s transition towards lower carbon concrete solutions for Australia’s transport infrastructure.