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1.1 This specification covers seven-wire uncoated, indented, stress-relieved steel strand for use in pretensioned prestressed concrete construction. Grade 250I and Grade 270I have minimum ultimate strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa], respectively, based on the nominal area of the strand.
1.2 Supplement I describes low-relaxation strand and relaxation testing for that product. Low-relaxation strand shall be furnished when specifically ordered and furnished in place of stress-relieved strand if mutually agreed to by the purchaser and supplier.
1.3 This specification is applicable for orders in either inch-pound units (as Specification A886) or in SI units (as Specification A886M).
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standards. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance 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.
U.S. Federal StandardFed. Std. No. 123 Marking for Shipments (Civil Agencies)
A1061/A1061M Test Methods for Testing Multi-Wire Steel Prestressing Strand
U.S. Military StandardMIL-STD-129 Marking for Shipment and Storage Available from U.S. Government Printing Office, Superintendent of Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://www.access.gpo.gov.
ICS Number Code 77.140.15 (Steels for reinforcement of concrete)
UNSPSC Code 31152208(Prestressed concrete stranded steel wire)
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ASTM A886 / A886M-10, Standard Specification for Steel Strand, Indented, Seven-Wire Stress-Relieved for Prestressed Concrete, ASTM International, West Conshohocken, PA, 2010, www.astm.orgBack to Top