Xypex Case Studies

Rosedale WWTP Outfall

  • Location: Takapuna, Auckland

  • Project Dates: September 2008 – November 2008

Project Description

Xypex Admix C-1000NF was added to the in-situ cast sections of the Rosedale Wastewater Treatment Plant Outfall Tunnel, bordering the sink shaft taking treated water to the Hauraki Gulf.

The shaft was bored vertically then a shunt area created and the Outfall Tunnel sections containing Xypex Admix were constructed, followed by lowering a TBM machine and subsequent boring and laying of precast sections of a smaller diameter on the seabed of the Hauraki Gulf and placement of the diffusers.

A significant volume of Xypex Admix was included in the in-situ cast concrete to self heal any fine cracks that might occur and help protect the reinforcing steel in these areas.

A small volume of Kuniseal was employed for some construction joints in select areas.

Photos provided by McConnell Dowell Constructors Ltd.

Project Details

  • Project Type: New

  • Structure Type: Sewerage/Treatment; Tunnel

  • Type of Construction: Conventionally Reinforced Structure

  • Type of Cement: GP

Products Used

Project People

  • Construction Company: McConnell Dowell Constructors Ltd

  • Concrete Supplier: Holcim NZ

  • Engineering Firm: Connell Wagner/Aurecon - Design

  • Engineer(s): Tom Hogan - Mac Dow

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