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June 13, 2018
Engineering Spotlight: Meet Scott Naiva

Posted by: Natalie Swift

During the last post, you learned more about Dave Keaffaber, P.E., and his role of representing GeoSpray® geopolymer mortar in the Storm & Sanitary industry. This week, we’re going to find out more about GeoSpray geopolymer as it pertains to lining maintenance holes as we

Meet Scott Naiva, P.E.

Scott’s experience in all aspects of infrastructure rehabilitation attracted him to GeoSpray geopolymer mortar because of its innovation to the Storm & Sanitary industry. 

“It is a game changing disruptive technology because it has superior compressive, flexural strength and excellent corrosion resistance all in one,” said Naiva. “More importantly, from a constructability standpoint, the self-bonding of GeoSpray mortar means we can place more material at one time than some competing systems.”

For example, when applying this product to a manhole, the same material can be used to parge (fill in) voids and irregularities before applying the prescribed liner thickness, as opposed to a two-step alternative.

According to Scott, there is plenty of work that needs to be done in the Storm & Sanitary industry, including rehabilitating maintenance holes. Scott has found success in this form of rehabilitation over the alternatives:

  • Portland cement lining – If you need a short-term, quick and easy fix to stop infiltration, this may be the least expensive upfront cost, but the harsh environment may preclude this option as a successful long-term solution. 
  • Portland cement and epoxy combo– This can be a timely and expensive two-step process to install. The cement underlayment is necessary to provide strength and a good surface for the epoxy to bond.  The epoxy is generally an excellent corrosion resistant non-structural protection layer when installed properly. The portland cement may often need time to cure and de-gas prior to placement of the epoxy. If care is not taken however, one drawback could be long term adhesion of the system. 
  • Calcium aluminate – This material works very well and has terrific corrosion resistant properties. In some cases, constructability can be a challenge. We believe that our geopolymer materials offer similar lifetime performance while being very contractor-friendly through ease of use and efficiency.

Challenges with these systems have led municipalities to approach Scott looking for alternatives. With GeoSpray geopolymer mortar, customers get the structural strength and corrosion resistance needed all in one application, as opposed to a two-step process. 

One of Scott’s clients tested GeoSpray mortar last year, and has now specified the product for this year’s maintenance hole rehabilitations. In another case, a client has decided to not only rehabilitate existing maintenance holes, but to also line new ones to extend the structure’s service life.

Scott believes as more asset owners, engineers and contractors experience the consistent successful performance of GeoSpray geopolymer mortar, it will become the preferred choice not only in large diameter pipe rehabilitation but also in manhole rehabilitation.

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Category: GeoSpray Geopolymer, Feature Articles

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