by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
Concrete In Australia : March 2013
Concrete in Australia VolVol 39 No 1 9 principle of pull-out as the 3D bre. e substantially higher tensile strength of the 4D bre (1450N/m ), in conjunction with the optimised hooks, results in pull-out happening at a higher level than the 3D series. " e end hook has been redesigned and optimised to function in perfect symbiosis with the higher tensile strength," oo said. "Intensive testing in the laboratory has taught us that in relative gures, we gain most performance in the fr1 range compared to the 3D bres." is makes this bre ideal for structures where SLS requirements are the governing design criteria. e 4D bre is being pitched as the ideal steel bre to use when combined with traditional reinforcement methods -- in cases of seamless oors, combination slabs, underwater concrete, motorways and harbour pavements. Using 4D, oo said speci c crack openings could be calculated and controlled, important for creating durable and liquid-tight structures, for example in the chemical industry. "Research has proven that the combination of Dramix 4D and traditional steel reinforcement is a marriage made in heaven for keeping crack openings very tight," he said. Bekaert has developed special so ware where, for a speci c maximum speci ed crack opening, the combination of the right dosage of 4D bres with traditional reinforcement can be calculated. "Feedback from contractors has taught us that cost savings of up to 35% can be achieved, without even taking any time savings into account. Just imagine that by adding 4D bres you could go from rebar to welded wire mesh or from a double to a single mesh," he said. With Dramix 5D, Bekaert is claiming: " is is steel bre concrete reinvented." e design of the bre adds another at again onto the ends of the 4D design, but in the way the bre behaves, the ductility of the steel bre concrete is not obtained by controlled bre pull- out as with the 3D and 4D bres, but by elongation of the wire itself. " e double hooked ends result in a prefect anchorage. Due to the engineered shape, the bre is 100% anchored in the concrete. e ultra- high tensile strength (> 2200N/mm ), together with an elongation capacity of 6%, makes this bre really special," oo explained. "With dosages of 35kg/m or more, tested on EN beams, we obtain a bending hardening behaviour. We can genuinely speak of a structural steel bre." Based on this unique bending hardening capacity, the 5D bre is designed for use in all structural applications, especially in applications where high bending moment capacity in ultimate limit state is "the" determining design requirement. e 5D is being pitched as a complete reinforcing solution for oors on piles, foundations ra s for multi-storey buildings and suspended structures. "In a lot of cases, the 5D bre can either completely replace structural reinforcement, or reduce considerably the amount of traditional reinforcement," oo said. He said advantages of using bre include the ability to laser screed steel bre oors, material cost savings, time savings and improved safety on the work site. The 4D steel fibre. The 5D steel fibre. MAKING PRECAST CONNECTIONS ntact Alan Kearon 0408 206 015 Email: Alan@SafePanel.net Visit our website at: www.SafePanel.net Cont The safest precast panel to panel connection system on the planet. WINNER: 2011 Concrete Institute Award for Excellence. "Automatic Panel to Panel Connection System" WINNER: 2012 WorkSafe (Vic). "Best Solution to a Workplace Health and Safety Issue: Preventing a Health and Safety Issue" WINNER: