Bridge Approach Polymer Grouting

Arlington, Virginia

The Job:

The George Washington Memorial Parkway connects Washington, DC with Fairfax and Alexandria Counties in Virginia. Originally designed as a scenic route, the road has transformed into a heavily used commuter route in and out of Washington. The road runs along the Potomac River, with bridges crossing deep ravines, including Windy Run.

Challenge:

Martins Construction reached out to CJGeo two weeks prior to required mobilization. The project was an accelerated deck replacement and structural repair, and loose soils on both approaches required stabilization using compaction grouting in a manor which would not affect return to service or the bridge deck overlay work.

CJGeo’s Solution:

CJGeo proposed polyurethane compaction grouting using CJGrout 30NHL, which is specifically formulated for improving the bearing capacity of loose soils. Grouting was performed on 4’ centers, at 5’, 10’ & 15’ below grade, until surface movement was detected. Top-down grouting was used to help ensure maximum densification of underlying soils, and approximately 25,000 pounds of grout were used over two mobilizations. Due to polyurethane grout’s nearly immediate cure, CJGeo helped ensure that ground improvement stayed out of the critical path of this accelerated project. Pre and post grouting DCP testing was performed by Schnabel Engineering to quantify the soil density improvement.

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