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Concrete In Australia : September 2008
NEWS Propex expands in Australia Concrete fi bre specialists Propex Concrete Systems recently opened a series of new offi ces in Sydney, Melbourne and Brisbane. Propex is a leading supplier of fibre solutions for concrete reinforcement, with fi bre concrete specialists and distributors in most major countries of the world. The national manager of Propex Concrete Systems (Australia) Lance Collins said the firm’s fi bres have been supplied to the local market for 20 years via capable distributors. “Now, from this solid foundation, we are expanding through the creation of our own company, with offices in Sydney, Melbourne and Brisbane,” he said. Propex Concrete Systems has spent more than two decades developing fibre reinforcement solutions – from simplifying placement and minimising cracks for concrete in the plastic state, to controlling cracks in the hardened state. The company participates in worldwide testing and code approvals to ensure that its products meet a wide range of national and international standards. Mixing causes the fibres to disperse throughout the concrete mix. The structural design of the Brisbane Square project features in the CCAA’S latest Concrete concepts study. Brisbane Square case study The story behind the engineering design of the landmark Brisbane Square project and the role concrete framing played in it features in the latest Concrete concepts case study from Cement Concrete & Aggregates Australia. Builder and project manager Baulderstone Hornibrook (BH) used a concrete framed design with post- tensioned fl oors, mindful of delivering the project on time and on budget. To help ensure this BH worked closely with its key suppliers to employ a number of innovations that helped minimise floor cycle times and reduce crane reliance. The 38-storey Brisbane Square is the 8 Concrete in Australia Vol 34 No 3 city’s largest offi ce building, its three slender external concrete columns on the George Street side of the building, rising 100m above a plaza to support the overhanging uppermost floors. Brisbane Square is the largest office building yet to be awarded a five-star rating (offi ce design v1) under the Green Building Council of Australian Green Star scheme. Concrete concepts is a free series of case studies focusing on the application of concrete framing on commercial high- rise projects around Australia and its role in delivering cost-effective construction solutions. To review the Concrete concepts series, visit www.concreteconcepts.net.au. According to Collins, concrete fi bre reinforcement continues to gain in popularity in both the Australian and international markets, with fibre reinforcement being incorporated into an ever-increasing number of slab-on-ground (particularly large slabs), suspended slab and underground shotcrete projects. Unlike traditional reinforcement methods, Propex fi bres are added directly to the concrete mix. Mixing causes the fi bres to disperse throughout the concrete mix, resulting in a three-dimensional reinforcement system that can be placed quickly, accurately, safely and cost-effectively. In one recent project, Propex steel fibres were used to reinforce a 40,000m2 internal slab fl oor, together with an additional suspended slab fl oor in Australand’s Corporate Express project in suburban Sydney.