Road Maintenance

Road Maintenance on Challenging Ground Conditions

Many roads require maintenance and rehabilitation due to challenging ground conditions, ageing infrastructure, or recurring problems with settlements and frost damage.

In areas with soft or unstable soils, traditional repair methods can increase loads on the subsoil and contribute to further settlements. Lightweight materials can help reduce these challenges by minimizing the load transferred to the ground.

Benefits of Foamed Glass Aggregate in Road Maintenance

Foam glass aggregates are one of the lightest granular construction materials available. The filling’s low density makes it particularly suitable for road maintenance and rehabilitation projects where reducing weight and improving ground stability are important factors.

By replacing thick layers of asphalt and heavier fill materials, foam glass aggregates can reduce the need for excavation and removal of existing masses. This can simplify construction, reduce transportation requirements, and contribute to more efficient and sustainable maintenance projects.

Foamit has developed a methodology using foam glass and geogrids that can effectively repair unstable slopes. The methodology has been tested on several roads with lasting results several years after the maintenance was carried out.

In short, the slope is secured by replacing existing masses on the half of the road facing the slope. The superstructure is then rebuilt with foam glass in the reinforcement layer, which drastically reduces the fill’s weight.

Frost Protection and Drainage in Road Rehabilitation

Foam glass aggregates contain approximately 80% enclosed air, providing excellent thermal insulation properties.

When used in road rehabilitation, it helps protect frost-susceptible soils from freezing and reduces the risk of frost heave and associated damage. Its drainage capacity also helps manage water within the road structure, improving durability and performance over time.

The low weight of foam glass aggregates make it easy to handle and install, even in projects with limited access or demanding construction conditions.

Once placed, the material forms a stable layer that can be compacted efficiently using conventional construction equipment.

The combination of low weight, stability, drainage capacity, and thermal insulation helps reduce the risk of settlements, water-related damage, and frost-related deterioration. This can contribute to extended service life and reduced maintenance requirements for road infrastructure.