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Knox County, IL
Concrete Clothâ„¢: Culvert Invert Lining

Project Overview


This existing 9-foot diameter corrugated metal pipe (CMP) was corroding
or rusting through the invert or base of the pipe. At some points, water
was just beginning to undermine the culvert, forcing the township to take
some action or risk affecting the roadway embankment and potentially
forcing an unscheduled replacement of the culvert. Stormwater runoff in this
agricultural area magnifies the corrosion rate of the metal culvert, either as
a result of the areas soils or fertilizers used, or both. In addition, there was
beginning to be some significant erosion at the inlet and outlet of the culvert,
which needed to be addressed.

Solution


The township considered pouring concrete in the invert to reestablish the
bottom of the pipe. Liners and complete replacement were also considered
but they were deemed too expensive. Further complicating some of these
options was the difficult access to the inlet and outlet of the pipe. Nature
had created a stilling basin at the outlet of the pipe and the flow of the
water course at the inlet along with fencing impacted what would be easy or
difficult during the project.
Once a road commissioner and county engineer agreed to share the cost
with the township using joint bridge funds, the project was able to move
forward. “This (Concrete Cloth) seemed to be so logical a solution, I wanted
to try it,” said the road commissioner.


Day 1 Access to the site was cleared and riprap was placed nearby. In addition,
a load of rock was staged close to the culvert ends so that the remaining
riprap could be placed after the Concrete Cloth GCCM was installed.
 

Day 2 Concrete Cloth GCCM was placed, hydrated and powder-actuated
fasteners were used to fix the material to the culvert. The entire second day
of work took 2.5 hours to complete.


Day 3 25 gallons of mastic were used along the high end of the Concrete
Cloth GCCM near the spring lines of the pipe to prevent water from getting between the material and the metal culvert.

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