South Karori, Wellington, New Zealand
GeoSpray®: Stormwater Corrugated Culvert

Project Overview 

Wellington City Council was looking for a solution to repair the 1350-millimeter South Karori stormwater corrugated culvert. During the past 50 years of its service, the culvert's invert had fully degraded over its entire length (220 meters) from erosion and corrosion, with holes of up to 500 millimeters deep thorughout the culvert. The culvert was installed simultaneously with the subdivision surrounding it, so it followed the natural stream bed, with four bends, vertical and horizontal deviations of up to 32 degrees and backfilled with up to 10 meters of cover.

The close proximity of the residential properties meant a trenchless, non-disruptive solution was required with at least a 50-year design life and an applicaiton that is less than 100 millimeters thick. The area was also popular for hiking and mountain biking, so public access had to be maintained during construction.

Opus International Consultants was hired to find a suitable product to meet the budget and timefram specifications of the council. After reviewing submissions, Concrete Treatments NZ Limited (CTNZ) was awarded the project by proposing GeoSpray geopolymer mortar as the structural solution.

Read the full case study here.

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