Project Overview

Bucknam Bridge crosses over interstate 295 in Falmouth, Maine. The bridge underwent significant repairs to replace aging infrastructure that was nearing the end of its useful life. The project was done in collaboration with RJ Grondin & Sons and the Maine Department of Transportation.

Design Challenges

Bucknam Bridge is located over compressible clay soils that are susceptible to settling. The bridge required fill material in the abutments to support its weight and the dynamic loads from ongoing roadway traffic. Traditional fill materials were too heavy for the soft marine clay soils found underneath the bridge and would have risked further settlement and instability. To ensure the bridge’s long term viability, a lightweight fill with high compressive strength was needed.

Glavel as a Solution

Glavel was chosen as the lightweight fill in this project’s bridge abutments because of a combination of its low bulk density and high compressive strength. The install team was able to compact 6 feet of Glavel to successfully raise the grade to support the vertical load above. By using Glavel, the project team reduced the weight burden on the compressible soils and ensured the structural stability of the bridge.