Crown Sydney, also known as One Barangaroo, features a casino, luxury apartments, hospitality venues and the city’s first six-star hotel. At 271 metres high and 75 floors, it is the new tallest building in Sydney, and the 4th tallest in Australia.
Crown Sydney is a major highlight of the 22-hectare Barangaroo project, which is an innovative redevelopment transforming a former container terminal alongside Sydney Harbour into a multi-faceted space.
The skyscraper takes inspiration from natural forms and curved geometry, with three 'petals' that twist and rise together.
Project Challenge
The client set an ambitious sustainability goal for Crown Sydney - a 20% reduction in embodied carbon across the entire site versus standard methods of construction.
Additionally, the congested Sydney Harbour site layout and requirements for continuous high-volume pours necessitated tailored concrete mix designs to optimise results under challenging pumping conditions.
Boral's Solution
To overcome logistical challenges, Boral built a bespoke onsite concrete batch plant to substantially reduce traffic movements – in line with the project’s safety and sustainability goals. Due to the scale of the project, up to 2,000m3 of concrete was required during peak times to service the construction site. This would represent approximately 300 agitator truck movements per day causing significant transport emissions and associated traffic impacts.
Boral's purpose-built batch plant was designed for a demanding pumping environment and eliminated the need for testing cylinders for early age strength through use of temperature tagging.
Our team developed a centralised pumping system using 4 separate lines to span the entire site and substantially reduce the need for agitator trucks. The batch plant sent concrete up to 300 lineal metres before pumping up the tower.
Unique long line concrete mix options were created to solve the challenges of pumping long distances plus high towers. De Martin and Gasparini, a subsidiary of Boral, supplied, pumped and placed the concrete during the build.
Project Outcomes
Boral’s low carbon concrete, ENVISIA®, was used to meet the stringent engineering requirements of the project and enable Crown to achieve a Green Building Council of Australia's 6 Green Star rating. Supplementary Green Star 3 customised concrete mixes were supplied to support world-leading sustainable targets.
Crown Sydney now features a casino, luxury apartments and the city’s first six-star hotel.
In an Australian first for Boral, Crown Sydney and Barangaroo South marked the first commercial and residential construction where agitators were not needed for the majority of pours.
Boral are proud to have been part of this landmark project which has redefined Sydney's skyline.
Visit www.barangaroo.com for more information about this iconic Sydney project.
