Leca® LWA Delivers Frost Protection for Critical Infrastructure in Hålogalandsveien Tunnels
Hålogalandsveien stands as one of Northern Norway’s largest and most ambitious transport infrastructure projects, aiming to enhance regional connectivity and road safety. This public–private partnership (PPP) includes the construction of 82 km of new European highway, featuring 7 tunnels (27 km) and 22 bridges, all designed to endure the challenges of Norway's rugged terrain and harsh climate.
Leca®’s Contribution to Tunnel Engineering
Leca played a key role in the project, supplying Leca® Lightweight Aggregate to several sections in collaboration with contractors Skanska and Hæhre.
The material was selected for its unique combination of thermal performance, lightweight structure, and drainage capacity, addressing several specific engineering challenges:
- • Frost insulation for water and sewer pipes
- • Thermal protection around manholes
- • Lightweight backfill in zones with low overburden tolerance
- • Frost protection in tunnel portals and rock-cut excavations
FACTS
Project name: OPS E10 Hålogalandsveien
Client: Skanska Norge & Hæhre Entreprenør
Location: E10 / Rv 85, Tjeldsund – Gullesfjordbotn – Langvassbukt, Norway
Construction period: 2023–2028
Innovative Delivery in Challenging Environments
Inside the Gullesfjord Tunnel, Leca LWA was applied using a pneumatic “blowing” technique, allowing the aggregate to be quickly and precisely placed around the pipelines within narrow trench spaces. This method proved highly efficient under the tight spatial constraints of tunnel work.
In the Brattfjell Tunnel, Leca LWA was delivered directly to Hæhre’s site and used as insulation around both pipes and manholes. The combination of low density and thermal performance made Leca LWA an optimal solution for installations exposed to cold and variable underground conditions.
Benefits of Leca® Lightweight Aggregate in Tunnel Applications
✔️ Accelerated construction pace – ideal for high-momentum infrastructure projects
✔️ Natural and sustainable material – reusable and environmentally friendly
✔️ Superior frost protection and drainage – engineered for Nordic climates
✔️ Load reduction – less stress on pipes and structural elements in confined backfill areas
Conclusion
Leca’s involvement in the Hålogalandsveien tunnels highlights the versatility and reliability of Leca LWA in complex infrastructure projects. Its performance in providing frost protection, reducing load, and accelerating workflow contributed significantly to meeting tight timelines and environmental conditions.
This project reinforces Leca’s reputation as a trusted partner in geotechnical and structural engineering, delivering proven results across challenging northern landscapes.
Downloads
