August 25, 2016
Geopolymers Part 4 | Manning the Sled to Ensure Consistency

Posted by: Joe Royer

While the Geospray sprayer is often attached to a sled that can be pulled through a pipe, the application process requires some human oversight.

For example, the person manning the sled will watch as the Geospray material is applied, checking thickness or depth gauges at multiple positions across the system for consistency. The gauges are physical markers that can be set up at various angles along the pipe to measure application thickness.

Depending on the diameter of the pipe, the repair team adjusted the amount of material and the speed of the sled. The spin head sprays uniformly 360 through the pipe. Walls closer to the spin head will get a little more material; walls farther away will get a little less. The installation team positioned the depth gauge at the farthest point away from the sled to make sure that that area received at least the intended design thickness. As a result, other areas throughout the pipe received slightly more.

As with most cements, cementitious materials and geopolymers, the water-to-cement ratio is critically important. Another key task for the repair team was to monitor the quality of the material being sprayed and ensure the appropriate water content. The physical properties of the finished product will vary based on this ratio, so it was crucial to keep it consistent.

The high-end water ratio Milliken Infrastructure recommends is .2; the low end is .16. If you get above .2, it becomes very hard for the materials to run, and it doesn’t stick. Conversely, if you get below .16, the GeoSpray material becomes fairly dry and it doesn’t pump very well. In essence, the material only operates in the spray system in the correct water ratios.

Guarantee your water ratios are correct before you spray your pipe – speak with our engineering team to dial in best application practices. Give us a call at 855.655.6750 or fill out a contact form.

Category: GeoSpray Geopolymer


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