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August 11, 2016
Geopolymers Part 3 | Cincinnati Steep Grades and Sewer Degradation

Posted by: Joe Royer

It’s hard to see in these pictures, but one of the biggest challenges of this repair job was its position on a steep (25 percent) grade. In fact, the slope was so severe in some places that the repair team needed to be tied to a rig so they would not slide down through the system. As a result, the sled carrying the GeoSpray sprayer could only be run one way – up the grade.

Otherwise, it would have run away and left a splattered and inconsistent coat of material on the inside of the pipe.

In addition to the difficulties with the slope, the stone that made up the pipe itself was misshapen and jagged. All of the grout material between the sections of stacked granite had also been eroded. Past repairs had used CIPP to cover these jagged edges. Because CIPP is a non-woven, bagged product, however, it was easy to puncture and therefore not a viable option for a long-term repair.

In a sense, applying CIPP in this particular pipe would have been like running a pair of nice, new dress socks across a razor blade.

Following inspection of the pipe, the pipe was thoroughly cleaned, and large chunks of stone at the bottom of the system were cleared out. While parts of the pipe made of laid brick were generally in better shape, a lot of them were still missing. Some bricks had lifted up and floated through the pipe as the grout deteriorated. While some floated away entirely, others settled at the bottom of the pipe.

Interested in how CIPP compares to the GeoSpray system in terms of performance, strength, and total installation costs? Check out the GeoSpray product page.

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Category: GeoSpray Geopolymer

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