Tarmac has trialled an innovative low carbon concrete solution on the ongoing High Speed 2 (HS2) project.

Working alongside HS2 main works contractor Align JV – comprising Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick – Tarmac’s product was used to form a structural slab and a vertical wall forming part of the pre-cast factory which is producing segments for the UK’s longest railway bridge.

The mixes designed to Align concrete specification, exceeded expectations in both fresh and hardened properties, and showed that the new concrete can be produced in normal concrete plants and placed via mixer truck and by skip with tremie pipe.

According to Tarmac, the product allows a 62% reduction in CO2e per cubic metre of concrete compared to standard CEM I concrete, meeting the same specification in the same raw materials.

Tarmac head of commercial engineering solutions Robert Gossling said: “Against the backdrop of the climate emergency, this project underlines the clear benefits which can be unlocked when clients and contractors collaborate, in this case engaging to help understand and accelerate the adoption of this new low carbon concrete solution.

“Together we’ve shown the material is fit for purpose in slabs and walls, with good repeatability and works with standard production and construction methods. This product is a great step along the UK concrete and cement industry’s net zero routemap, and the demonstration will help accelerate adoption of this new concrete.”

Align project director Daniel Atlier added: “It is a strategic imperative for Align, reflecting the priorities of our JV partners and in line with HS2 commitments to reduce carbon emissions by 50% and look for opportunities to improve our carbon footprint.

“The early results of this trial are very encouraging and highlight the benefits to be gained through close collaboration with our supply chain partners”

Tarmac is currently providing concrete for the construction of Central 1 section of HS2 Phase One that is being delivered by Align. This includes a 21.6km section of high-speed rail infrastructure incorporating a 3.37km viaduct across the Colne Valley, a 16.04km twin-bored tunnel, and five vent shafts handling both intervention and tunnel ventilation facilities.

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