Sustainability is at the heart of 333 George Street, an 18-storey building in Sydney's CBD featuring a mix of retail and office tenants. Central to achieving the goal of achieving a 5 Star Green Star rating is the selection of °µÍø¸£Àû's innovative ENVISIA® concrete for the building's suspended post-tensioned floor plates, columns and core walls.
333 George Street was the first commercial project to use ENVISIA® in super-structure elements, chosen for its reduced carbon and high early strength qualities. Typical cement replacement levels in post-tensioned concrete are 20 per cent, but ENVISIA® achieved a minimum of 60 per cent cement replacement. This was estimated to have saved about 700 tonnes of CO2 emissions.
ENVISIA® was used to build the columns, core walls andÌýsuspended post-tensioned slabs where drying shrinkageÌýwas a critical factor in the design. ENVISIA® achieved theÌý22MPa strength needed after four days, allowing constructionÌýto continue at a rapid pace required in modern projects,Ìýcompared to the five or six days that would be expectedÌýfrom concrete with this high level of cement replacement.