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Concrete In Australia : March 2013
8 Concrete in Australia Vol 39 No 1 NEWS New solutions for steel fibres in concrete Following the US launch in January, Bekaert has toured Australia releasing its new range of innovative steel bres into the construction market, aiming to spread into segments of the market previously the strict domain of standard reinforcement. Steel bres from the new range are now usable in 10 market segments bres had yet to penetrate, including structural ra s (at ultimate limit state and serviceability limit state), civil engineering structures, bridges, concrete roads, pile supported oors, combi slabs and seamless slabs. "Ste el bres and steel bre concrete have been in the market for over 50 years. During that period the use of steel bres became common place in a speci c range of applications such as oors on grade, shotcrete for tunnels and precast elements," Bekaert global building products market manager Hendrik oo said. "We can now certainly regard steel bre concrete as an established building material." He explained that steel bres change the behaviour of concrete. ey transform a brittle product into a ductile material. "If we look at the behaviour of a single bre in the concrete matrix we aim for a controlled pull-out. When bridging a crack, the bre is rst put under pressure. Before the tensile stress in the steel surpasses the maximum tensile stress, the bre should be pulled out gradually. If the bre starts slipping too fast the tensile stress capacity is not utilised to its maximum. If the bre is too well anchored in the concrete, making the bre snap before pull-out happens we don t achieve the ductility requirement," he said. A er spending close to $2.5 million in research and development, Bekaert has redesigned and expanded its Dramix range of steel bres for concrete reinforcement to now o er three di erent types of steel bre. Dramix 3D is the new name for the existing range of steel bre with the hooked end. oo said: "Forty years ago the traditional end hook was optimised for a tensile steel strength of approximately 1050N/mm ." Dramix 4D adds an extra angle on each end of the hook which oo said has improved the anchorage. e 4D bre works under the same Gold Members The pull-out test results from the three different steel fibres released onto the market.