Heidelberg’s sustainable asphalt at Eurotunnel: design and emissions notes for engineers
Reviewed by Joe Ashwell
First reported on The Construction Index
30 Second Briefing
Heidelberg Materials UK has resurfaced 1,600m² at the Kent entrance to the Eurotunnel service tunnel and emergency vehicle garages with 140 tonnes of Tufflex asphalt using a CarbonLock bio-binder and CleanAir additive, cutting CO₂ by more than 25% versus the original SMA specification. The Era 140 warm mix process enabled production at up to 40°C lower temperature, reducing plant emissions by up to 15%, improving on-site conditions and shortening possession time. Biogenic CarbonLock permanently stores absorbed CO₂ even after recycling, while CleanAir cuts specific gas and particulate emissions by up to 40%, critical for tunnel air quality.
Technical Brief
- Resurfacing targeted the Kent-side entrance to the Eurotunnel service tunnel and emergency response vehicle garage apron.
- Tufflex mix design prioritises high deformation resistance for heavy emergency-vehicle loading and frequent turning movements.
- The same mix also provides enhanced skid resistance, important for braking and manoeuvring in constrained tunnel approaches.
- Use of a low-odour binder system directly addresses ventilation and worker exposure constraints typical of enclosed tunnelling environments.
Our Take
Heidelberg Materials UK’s 15% CO₂ reduction in asphalt production at the Kent Eurotunnel site aligns with its wider decarbonisation push seen in our coverage, including hydrogen-fuelled asphalt production trials and the planned carbon capture facility at Padeswood cement works in north Wales.
Using 140 tonnes of lower-temperature asphalt at the Eurotunnel service tunnel entrance gives Heidelberg Materials a high-profile reference for low-emission surfacing on critical infrastructure, which is likely to support future highways contracts such as the re-secured £9m Wirral Borough Council resurfacing framework.
Across our Infrastructure coverage, Heidelberg Materials UK appears frequently in sustainability-tagged pieces, signalling that UK clients now see low-CO₂ asphalt and concrete as a differentiator on safety-critical assets like tunnels and emergency access routes rather than a niche add-on.
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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