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VTrans describes Colchester Exit 17 rebuild; uses foamed glass aggregate behind bridge abutment
Summary
Agency engineers described the multi‑season Exit 17 Reconstruction project, which includes new ramps, a US‑2 bridge over I‑89 and use of foamed glass aggregate (FGA) as lightweight backfill to stabilize abutment soils.
Vermont Agency of Transportation project staff briefed the group on the Colchester NH 028‑1 (Exit 17) reconstruction project, a multi‑season contract that includes new interstate on/off ramps and a new US‑Route 2 bridge over I‑89.
The contractor is using foamed glass aggregate (FGA), a lightweight engineered aggregate, in the backfill for a mechanically stabilized earth abutment at the new bridge. A highway division presenter said FGA is…
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