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Concrete In Australia : June 2012
12 Concrete in Australia Vol 38 No 2 NEWS and 8m wide at the base. e properties of the 30m3 of concrete in each segment exhibit a very low shrinkage and high early strength to enable it to be stripped from the mould the next day and ensure it reaches the required strength of 50MPa. e casting yard will use around 11,000t of steel reinforcement and 57,000m3 of concrete to make the 2200 segments. Local suppliers providing concrete include Boral (Wingfield) and Holcim (Hindmarsh). OneSteel is preparing reinforcing steel from its premises at Cavan. At the Northern Interchange area, where the elevated roadway ties in with an existing highway, 204 Super-Ts will be used, all of which are to be supplied by a local manufacturer. e prestressed girders are up to 28m in length and 2.2m wide, using an average of 22m3 of 50MPa concrete. e entire Northern Interchange structure itself will comprise 8250m3 of concrete and 2150t of reinforcement. Northern Interchange piling is due to commence shortly and involves 156 CFA piles (900mm diameter) approximately 30m in length. Erection of the Super-T beams is due to commence in July. e South Road is the only continuous link between Adelaide s northern and southern suburbs, forming the spine that connects Adelaide s major transport hubs. e project is South Australia s largest ever investment in a road project and is scheduled for completion next year. Upgrade completed on Split Rock Dam NSW government-owned State Water has announced the completion of the $7.6 million Split Rock Dam safety upgrade on time, on budget, and without any lost time injuries. Split Rock is a concrete faced rock fill dam and the upgrade involved removal of the top section of the dam crest and construction of a 2m high concrete parapet wall over the crest length of 456m. e upgrade brings the structure into line with modern standards for extreme flooding and ensures it can withstand the biggest flood considered possible for the area. e project was designed by URS and constructed by John Holland. NSW Public Works was awarded the contract for site management during construction. " e majority of supplies and subcontractors for these projects have also been sourced from this region, and all projects involved people relocating to the district for the duration of construction as well," the state member for Tamworth Kevin Anderson said. "John Holland managed their resources to stay on time despite heavy rainfall which saw the dam rise from 20% when the project started to its current level of 82%," State Water project manager Kock Ooi said. Split Rock Dam was constructed in 1987 to irrigate the Namoi Valley, protect the river environment and supply additional water for towns along the Namoi River. It has a capacity of 397GL and features an ungated concrete chute spillway. The upgrade of the Split Rock Dam near Tamworth in NSW involved building a 2m concrete wall along the top of the dam to prevent overtopping during extreme floods.