We collaborated with Auckland Council and Hynds to reduce the carbon footprint of the Greenville Road Stormwater Culvert Upgrade project.
In a joint workshop to improve sustainability and value, Auckland Council Healthy Waters, McConnell Dowell, and Hynds Pipe Systems reviewed the pipe design to develop a low-carbon solution.
Karun Kumar, Tunnels Project Engineer for McConnell Dowell, says, "We made the decision to incorporate low-carbon concrete in the design of the pipes. It was important that the design of the jacking pipes allowed for 1,400 tonnes of thrust force, the maximum our jacking frame can apply. Working together we were able to deliver the lowest carbon option that met the project requirements for the material strength, program, and cost."
How?
Producing cement produces a lot of carbon so reducing the ratio of cement, along with adding supplementary cementitious materials in the concrete mix, the carbon footprint was minimised.
The project team agreed on 2100 mm diameter Hyforce® Butt Joint Concrete Jacking Pipes, a low-carbon product made by Hynds, strengthened with a fixed stainless steel jacking band.
The 92 pipes produced by Hynds saved approximately 62 tonnes of CO2e emissions, a 16% reduction compared with standard concrete pipes of the same size.
The collaborative approach with our customer and pipe supplier has already made a positive impact on the overall program and provided a cost-effective solution.
Tunnelling was completed in September 2024 and the project is due for practical completion in mid-2025.
Watch the video below to find out more about the low-carbon pipe solution.
