Work repairing the failing southeast bound lanes of U.S. 36 will continue into October as the Department of Transportation announced they’ll rely on lightweight geofoam to support the roadway. …
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Work repairing the failing southeast bound lanes of U.S. 36 will continue into October as the Department of Transportation announced they’ll rely on lightweight geofoam to support the roadway.
Crews have been working to repair the Boulder Turnpike after Denver-bound lanes began failing mid-July between the Broomfield and Church Ranch Boulevard exits.
Denver-bound traffic has been rerouted into the northbound lanes, creating a bottleneck in both directions on the road while crews work to repair the damage from a sinkhole that formed in the road.
The latest plan calls for crews to sink more than 100 concrete caissons to bedrock to support the road. Rather than soil, geofoam fill blocks will be placed along a retaining wall instead of soil. Geofoam is a lighter-weight polystyrene material often used to support roads and bridge approaches. Since it’s lighter than soil, it’s meant to reduce pressure on the underlying soil.
Next, a concrete slab will be placed over the geofoam to distribute the weight evenly. A crushed stone road base will go on top of that, followed by a concrete pavement driving surface.
The southeast bound lanes should reopen in October, with work installing pre-cast concrete panels along the road and work building a bike lane continuing through December.
Transportation department officials noticed cracks on the pavement on Thursday, July 12 and began monitoring them. By Friday afternoon, the cracks and widened enough close all but one lane of the road between Wadsworth Boulevard and Church Ranch Boulevard.
The cracks continued to widen over the weekend, leading the department to completely closed the southeastern-bound road.
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