Strand Specifications and appearance quality

(1) surface of the wire twisted galvanized steel wire should plated - layer uniform, continuous zinc, without the scars, cracks and other defects and lack of plating. Each wire for galvanized steel should be closely twisted, there should be staggered, breaking and bending and so on. Strand diameter and lay length should be uniform, not loose after cutting.
(2) study prestressing strand surfaces must be free of lubricants, grease and other adhesion reducing strand and concrete substance. Strand surface allows a slight rust, but not as visible corrosion pits.
(3) strength aluminum clad steel surfaces should be smooth, it does not allow the phenomenon of exposed steel. Stranded tight should be uniform, there should be no shortage of wire, broken wire, loose stocks, damaged and so on, after cutting should not be loose.