This specification covers uncoated, deformed, stress-relieved, and low-relaxation wire for use as prestressed tendons in concrete railroad ties. Deformed wires with nominal diameters shall be supplied in coils and shall conform to specified values of breaking strength requirements. The relaxation losses of normal stress-relieved and low-relaxation stress-relieved wires should not exceed the specified limits. The two acceptable types of deformed wire shall have specific dimensions of deformations, where the depth of indent shall be the average depth of six or more random indents measured at maximum depth. The material shall be tested on and shall conform to specified values of the following mechanical properties: breaking strength, load at 1% extension, elongation, bending, and relaxation.
KeywordsAnnealing - Prestressed Concrete - Prestressed Concrete Products - Railroad Ballasts - Railroad Ties - Steel - Steel Wires - Stress Relieving - Wires, Wire Strands, and Wire Ropes
ICS CODE77.140.15 (Steels for reinforcement of concrete)
UNSPSC CODE31152207 (Prestressed concrete steel wire)
ASTM A881 / A881M-16a, Standard Specification for Steel Wire, Indented, Low-Relaxation for Prestressed Concrete, ASTM International, West Conshohocken, PA, 2016, www.astm.org