Jefferson Barracks National Cemetery, just south of St.
Louis, is one of the nation's largest military burial sites.
Established shortly after the Civil War, it covers 331 acres (134
hectares) and 188,000 graves. The cemetery
sits on the banks of the Mississippi River, and a planned
expansion in 2011 revealed that box culverts running alongside the
expansion area were experiencing significant groundwater
URS Group concluded that more than 100 joints would
require repair in the 10' wide x 5' tall and 8' wide x 5' tall
culverts. Some of the joints had opened as much as 3 inches,
causing the rubber water stop to fall out of the joints.
Limited access was the biggest challenge. All the
material, equipment and personnel could only reach the work site
through a small number of manholes or the ends of the culvert. Cold
weather conditions provided an additional challenge.
Applied Polymerics was contracted to undertake chemical
grouting to seal the leaks and restore the culverts. Given the wide
gaps, the activated oakum technique was used: dry oakum
was soaked in a hydrophilic polyurethane resin that forms
structural foam. This was followed by injection an extremely low
viscosity, hydrophilic polyurethane resin. Repaired leaks were then
sealed with an epoxy gel.
More than 100 joints were ultimately repaired and fully sealed.
No residual leaks remained.
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