The bridge approach bump is one of the most common and costly maintenance problems in highway infrastructure.
What Causes Bridge Approach Bump?
Bridge approach bump is caused by differential settlement between the bridge structure and the approach embankment built on soft, compressible soils.
How EPS Geofoam Solves the Problem
By replacing heavy soil fill with lightweight EPS Geofoam, the stress on the underlying soft soil is dramatically reduced, minimizing or eliminating consolidation settlement.
Design Guidance for Bridge Approaches
Bridge approach geofoam designs typically use EPS 22 or higher. A reinforced concrete approach slab spans from the bridge deck to the geofoam fill area.
Retrofit vs. New Construction
EPS Geofoam can be used in both new construction and retrofit applications. Retrofit projects benefit from geofoam's fast installation.
Long-Term Performance
Long-term monitoring of bridge approach projects has shown that properly designed and installed geofoam fills maintain their elevation over decades.
Key Takeaways
- Bridge approach bump is caused by differential settlement between the rigid bridge and the settling approach embankment
- EPS Geofoam eliminates the bump by reducing stress on the underlying soft soil
- EPS 22 or higher is typically specified for bridge approach applications
- Geofoam works for both new construction and retrofit of existing problem approaches
Have a Project That Needs Geofoam?
Submit your details and get connected with supply options in your area.