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July 28, 2016
Geopolymers Part 2 | Analyzing the Problem: Pipe Access and Application Issues

Posted by: Joe Royer

One of the only places the repair team could locate the pipe was through a manhole that allowed only limited access for the crew. To make matters more complicated, the material at the pipe went from round to arched and changed diameter in the middle, which is very difficult for most pipe repair technologies to deal with.

Fortunately, the team did not need to excavate any manholes to gain access to the pipe. Instead, they were able to set up the Geospray equipment in a parking lot approximately 400 or 500 feet away from the application point, then run the mortar hoses down an existing manhole to do the job.

Once the team was able to access the pipe, they had to deal with its irregular shape. With a shape change from arched to round at different points within the pipe, the team expected different thicknesses depending on the distance between the wall and the spin head. Because of the condition and the irregular shape of the pipe, the initial sprays were done by hand. The repair team then used a pump with a shotcrete type nozzle to fill the voids in the open granite, and stabilized the loose stones. This created a reasonable surface of a new, uniform host pipe. At that point, the sled carrying the GeoSpray sprayer was pulled through.

The spray application made the repair process extremely simple. Because the host pipe was used as a form, the contractor needed only to focus on spraying to the host pipe. Changes in the pipe from 36 to 42 to 60 inches in diameter simply meant changing the speed of the sled carrying the GeoSpray sprayer to ensure the right thickness was applied.

Want to see a GeoSpray sprayer in action? Check back soon for the video to get an up close look at exactly how it works. Contact our engineering team about any questions you have about the process.

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Category: GeoSpray Geopolymer

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