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October 10, 2016
Part 1 | Quickly, Easily Repair Large Diameter Pipes

Posted by: Joe Royer

Before a city puts a project out to bid, they do a condition assessment to confirm there is a problem with piping structure and it needs to be fixed.  

Milliken Infrastructure Solutions (MIS) works with contractors who do their own assessments and take video of what a project looks like before and after rehabilitation. If MIS’ GeoSpray geopolymer mortar has been specified for the repair, surface preparation typically follows the following steps:

1. Cleaning

2. Pressure washing

3. Stopping infiltration

Pressure washing is separate from cleaning because it has more to do with removing loose debris from the pipe. For example, the concrete in the crown of a sanitary sewer pipe is typically very soft, and contractors will want to expel that material before applying a repair.

Whatever ‘good’ material is left behind will work better for adhesion with the GeoSpray material. Otherwise, loose pieces of rock or pipe may fall off with the added weight of the repair material, creating a hole in the area that was just sprayed.

Depending on the job requirements and the shape of the pipe, contractors will either hand apply the repair material, or use a mechanical sled that has a spin-casting nozzle on it, especially for round pipes.

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Category: GeoSpray Geopolymer

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