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Concrete In Australia : March 2008
depending upon prevailing weather conditions • The type of concrete saw being used will also have an effect on timing – for example the dry cutting Soff-Cut saws (with patented skid plates) are usually able to fi nish several hours before conventional wet cut saws can commence. Cutting procedure • Appropriate personal protection equipment must be worn at all times. • The saw cut grid should be pre-marked with a chalk line. • Choose the appropriate blade type for the concrete being cut (ie aggregate hardness). • Saw cutting should commence in the area of the slab where concrete was first placed and then follow the placement sequence. • Sacrifi cial joint protectors should be inserted at cross cuts to prevent the forming of weak triangular shaped corners. • Damp concrete residue (Soff-Cut saws) or wet concrete slurry (conventional wet cutting saws) should be collected and disposed of in accordance with the EPA requirements for each particular site. Curing • An approved curing compound should be applied to the concrete as soon as possible. • Where Soff-Cut saws are being used the saw is basically following the power trowel “up the slab” (see Figure 2).Therefore, it is acceptable, in these circumstances only, that the curing compound be applied after the Soff-Cut saw has completed its task. On sites where conventional wet cutting saws are being used curing compounds should be applied immediately the surface compaction (ie power trowel) process has been completed. John Crocker is product manager of Soff-Cut Systems – Asia Pacifi c for Husqvarna Construction Products Australia. Figure 2. The cutting window for concrete sawing is normally between three and fi ve hours following the concrete pour. Precast Concrete Handbook A joint publication produced with National Precast Concrete Association Australia. Available via the Institute’s web site or through Standards Australia/SAI Global. This Handbook is the first on the market specifically devoted to all aspects of Australian precast concrete construction including design, specification, manufacture and installation. It reflects current industry best practice featuring the latest innovative applications of precast concrete ranging from simple structural elements to industrial and skeletal frame buildings, to decoratively finished complex-shaped architectural facade panels and sophisticated bridge girders. It provides guidelines in the form of graphs, charts and worked examples to assist in the design of precast concrete structures in accordance with AS 3600-2001. The Handbook is intended for architects, engineers, quantity surveyors and students as well as those involved in the building, infrastructure and construction industry. 56 Concrete in Australia Vol 34 No 1