Dulux® Protective Coatings is providing a three coat AS/NZS 2312.1 PUR5 system to protect the bridge's structural steel. Importantly, our specification complies with the Queensland Department of Transport and Main Roads requirements outlined in TMR TN144.
An approved PUR5 system with a projected 25 years to first maintenance
The following PUR5 system was selected to deliver maximum durability and with an extended maintenance cycle of up to 25 years to first maintenance in accordance with AS 2312.1 Table 6.3:
- First coat: Dulux® Zincanode® 402 – a two pack epoxy zinc rich primer.
- Second coat: Dulux® Duremax® GPE – a high performance two pack epoxy formulated for severe environments.
- Third coat: Dulux® Weathermax® HBR – a high build recoatable polyurethane topcoat that is ideal for marine environments and can withstand extreme UV exposure.
The system in detail
Brendan Lichtendonk, our Sales Manager in Queensland outlines the benefits of each product in the system:
- "Zincanode 402 provides the sacrificial protection to the steel substrate, and in atmospheric exposure which is a critical part of the system. It's indefinitely recoatable and offers fast turnaround, delivering efficiency savings for Tranzblast, our painting and blasting partner on this project," Brendan says.
- "Duremax GPE offers a quick turn hardener, which is also important for fast turn around and workshop throughput."
- "Weathermax HBR offers long term colour and gloss retention, demonstrated over decades. While traditional bridge coatings are grey, a different look is required at Kangaroo Point Green Bridge. Weathermax HBR delivers the desired aesthetic finish in a durable, glossy off-white.
"Due to it being listed in the TMR Technical note 144 specification, this PUR5 system conforms to AS 2312.1 Table 6.3 - our guiding light when selecting systems to protect against atmospheric corrosion," explains Brendan.
"In a C3/C4 corrosivity category, AS 2312.1 Table 6.3 states a time to first maintenance of 25+ years. This is understandably very important to asset owners the Brisbane City Council, and other project stakeholders. The system also lends itself to ease of application for site touch ups after construction."
"Due to the choice of an off-white colour, Brisbane City Council were seeking a system that is somewhat self-cleaning. Weathermax HBR fits the bill as a gloss polyurethane - by nature of its smooth, hard polyurethane resin, it will self-clean in good rain events," Brendan adds.
Proven on projects around the nation
The PUR5 system in use at Kangaroo Point Green Bridge has been used on multiple high-profile projects around the country, where corrosion protection and aesthetics are critical.
In Queensland, the system is highly regarded and proven across infrastructure projects including 900 Ann Street Brisbane (Aurizon Building), the Kurrawa Surf Club and The Star Casino Gold Coast. In WA, the Aubin Grove Train Station overpass, which recently received a Level 1 coatings rating seven years after application was also coated in this robust, proven system.
Specification support from design to tender
Dulux Protective Coatings is providing ongoing support to diverse stakeholders on this project. Our specification was included in the reference design created by COX Architecture.
"We were engaged to deliver a fit-for-purpose coating system that would meet the requirements of the TN144 standard," explains Brendan Lichtendonk, our Sales Manager in Queensland. "Durability and warranty periods were also critical."
Brendan also provided coatings advice to BESIXWatpac during the construction tender process.
"Our team is happy to assist builders to interpret and cost specifications," Brendan says.
Following an extensive procurement process, Brisbane City Council appointed Connect Brisbane, led by BESIXWatpac, to design and construct the Kangaroo Point Green Bridge.
Outlining a program of works
The Queensland team continue to add value at every stage of the project. They are working with Beenleigh Steel Fabrications (BSF) and the applicators at Tranzblast, guiding them on the steps and processes required for each stage of construction, including:
- workshop applications
- dockside applications
- over water applications
- maintenance applications.
"We've been working with the design and construction team to deliver a protective coatings painting works procedure. We want to ensure every detail is considered," Brendan says.
Construction started in late 2021, with expected completion in 2024.
