Active Standard ASTM A779 / A779M | Developed by Subcommittee: A01.05
Book of Standards Volume: 01.04
Historical (view previous versions of standard)
This specification covers seven-wire, uncoated, compacted, stress-relieved steel strand for prestressed concrete. The chemical requirements, mechanical requirements, and dimensions and permissible variations are presented. The mechanical requirement includes breaking strength, load at 1% extension and elongation. Different test method shall be performed on the strand that includes dimension test, breaking strength test, load at 1% extension test, elongation test and workmanship.
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1.1 This specification covers two types and three grades of compacted, seven-wire, uncoated strand for use in prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). The three grades are 245 , 260  and 270 .
1.3 The values stated in either inch-pound or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A994 Guide for Editorial Procedures and Form of Product Specifications for Steel, Stainless Steel, and Related Alloys
A1061/A1061M Test Methods for Testing Multi-Wire Steel Strand
U.S. Federal StandardFed.Std.No.123 Marking for Shipments (Civil Agencies)
U.S. Military StandardMIL-STD-129 Marking for Shipment and Storage
ICS Number Code 29.060.01 (Electrical wires and cables in general)
UNSPSC Code 31152207(Prestressed concrete steel wire)