Dramix® - Reinforcing the future - Bekaert

Designed for durabilityAnchorage strengthThe hooked ends of Dramix ® 3Densure the desired fibre pull-out.This is the mechanism whichactually generates the renownedconcrete ductility and post-crackstrength.The improved anchorage ofDramix ® 4D utilizes the sameprinciple but translates it togreater steel strengths.Dramix ® 5D, in contrast, isshaped to form the perfectanchor; the pull-out mechanismis replaced by fibre elongation.Wire strengthThe tensile strength of a steelfibre has to increase in parallelwith the strength of its anchorage.Only in this way can the fibreresist the forces acting upon it.Otherwise it would snap, causingthe concrete to become brittle.On the other hand, a strongerwire cannot be fully utilized withan ordinary anchor design.Therefore the tensile strength of afibre has to be perfectly alignedwith its anchorage system andits diameter. Dramix ® 3D, 4D,and 5D are each designed tocapitalize on the wire strengthto the maximum degree.Wire ductilityWire ductility and concreteductility are two different aspects.Dramix ® 3D and 4D createconcrete ductility by the slowdeformation of the hook duringthe pull-out process, and not bythe ductility of the wire itself.This is different for theDramix ® 5D. Due to the “perfectanchor” design, the fibre cannotbe pulled out and does not movein the concrete. Instead the wireis elongated, providing theductility on the same principleas classic reinforcement steel.This is only possible with asuperior and exceptional qualityof ductile steel wire.5DDramix®Tensile curves 3D-4D-5D wire qualities25005DDramix®20004DDramix® Dramix ®Stress (N/mm 2 )150010004DDramix® Dramix ®3DDramix®5003DDramix®00,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00Strain (%)The tensile strength of the 5D, 4D, and 3D series offers differentperformance levels for different applications. The 5D series combinesextreme tensile strength with a very specific elongation capacity,providing previously unseen levels of ductility.18n