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1.1 This specification covers two types and two grades of 2- and 3-wire, uncoated steel strand for use in pretensioned and posttensioned prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation shall be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered, or by arrangement between purchaser and supplier. The two grades are 250 and 270. Grades 250 and 270 have minimum tensile strengths of 250000 psi (1725 MPa) and 270000 psi (1860 MPa) respectively, based on the nominal area of the strand.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are provided for information only.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A1061/A1061M Test Methods for Testing Multi-Wire Steel Strand
U.S. Military StandardMIL-STD-129 Marking for Shipment and Storage
Federal StandardFed.Std.No.123 Marking for Shipments (Civil Agencies)
ICS Number Code 77.140.15 (Steels for reinforcement of concrete)
UNSPSC Code 31152207(Prestressed concrete steel wire)