... .18mm-0.25mm 3.Tensile strength: 2500Mpa Daye Micro steel fiber has successful been used in military project ,Qinghai-Taibet railway ... powder, cement, silica fume, superplasticizer and micro steel fiber,RPC has ultra high strength,high durability and good bulk stability,mainly used in ... cover, railway precast super low beam ,arch bridge. Micro steel fiber for ultra high performance concrete