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Central Waikato Network Outcome – Renewal Sites
Foamed bitumen to the rescue
PROJECT: Central Waikato Network Outcome Contract – Renewal Sites CONTRACTOR: Hiway Stabilizers NZ CLIENT: Waka Kotahi NZ Transport Agency VALUE: $4.4m
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The Central Waikato NOC rehabilitation treatments have been undertaken using a refined Catalogue Design, meaning a single design is proposed for all rehabilitation sites.
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The proposed treatment is assessed against each rehabilitation section and confirmed to be appropriate through interpretation of deflection data, test pits and laboratory testing. Any amendments due to geometric constraints or other factors are The philosophy reduced the number considered. of test pits needed and laboratory During construction, Hiways has a testing was limited to confirmation full time Quality Assurance technician that foamed bitumen stabilisation is a monitoring every aspect of stabilisation suitable treatment for the job. Extensive to ensure that the design parameters are workshopping with Waka Kotahi met. With active traffic management, NZ Transport Agency and Downer traffic can be directed across the site sped up the design process – and with very low risk of damage to the implementation. surface of the stabilised layer.
A collaborative approach between Assessment of foamed bitumen the parties meant FWD testing was stabilisation has found it to have assessed and used in conjunction lower than normal whole of life carbon with site walkover to determine the emissions. It can be constructed quickly locations of test pits; finding the most and opened to traffic immediately if appropriate locations is critical to required. Foamed bitumen stabilisation success. Construction methodology is also a highly sustainable treatment was amended to mitigate risk of option for recycling / reuse of existing incorporating unsuitable materials basecourse materials – allowing the into the stabilised basecourse layer, reuse of “tired” aggregate, saving particularly with the level of testing for significant quantities of new quarried each site. material.
CCNZ / HIREPOOL CONSTRUCTION EXCELLENCE AWARDS 2022
