Central Hawke's Bay District Council is committed to building a resilient roading network and is excited to team up with Downers Group NZ to undertake an anti-flush trial along a section of Pōrangahau Road.
Central Hawke's Bay District Council and Downer Group NZ will be proactively participating in an anti-flushing trial starting during the first few months of 2024. A section of Pōrangahau Road, between Bush Road and Wallingford Road that has the tendency to flush in the warmer weather has been selected to trial a new anti -flush product (bitumen). Data will be collected over the coming months to measure the performance of the anti-flush bitumen and if the product has a high success rate it may be used nationwide to improve the durability of NZ roads.
Committed to building a strong and resilient roading network, our teams are constantly seeking innovative ways to deliver benefits to our roads.
What is anti-flushing?
The flushing of our roads surface is an issue that continues to threaten the strength of our roads. When flushing is occurring, the surface will become shiny as the bitumen (used to stick the chip to the road) rises to the top and the chip sinks below. Hawke's Bay summers are well known to cause this flushing effect.
This issue leads to an increase in pot holes and a reduction in grip on our roads and pavements. Road Science (a technical laboratory division of Downer Group NZ) have developed a product that acts as a barrier to flushing of road surfaces. The product is called 'Anti-flush' and acts by blocking the bitumen from rising to the top. The high polymer binding is designed to suppress flushing and extend the seals lifespan.
Road Science have donated the product for the trial that will see it tested and data recorded to assess its viability for future use across New Zealand.
Disclaimers and Copyright
While every endeavour has been taken by the Central Hawke's Bay District Council to ensure that the information on this website is accurate and up to date, Central Hawke's Bay District Council shall not be liable for any loss suffered through the use, directly or indirectly, of information on this website. Information contained has been assembled in good faith. Some of the information available in this site is from the New Zealand Public domain and supplied by relevant government agencies. Central Hawke's Bay District Council cannot accept any liability for its accuracy or content. Portions of the information and material on this site, including data, pages, documents, online graphics and images are protected by copyright, unless specifically notified to the contrary. Externally sourced information or material is copyright to the respective provider.
© Central Hawke's Bay District Council - / +64 6 857 8060 / email@example.com