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AASHTO M 203M/M 203 2012 Edition, January 1, 2012
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Standard Specification for Steel Strand, Uncoated Seven-Wire for Concrete Reinforcement
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This specification covers two types and two grades of steel strand, uncoated seven-wire for use in pretensioned and posttensioned prestressed concrete construction. The two types of strand are lowrelaxation and stress-relieved (normal-relaxation). Low-relaxation strand 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. Grade 1725 [250] and Grade 1860 [270] have minimum ultimate strengths of 1725 MPa [250 ksi] and 1860 MPa [270 ksi], respectively, based on the nominal area of the strand.

The values stated in either inch-pound units or SI units are to be regarded as standard. 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.

The supplementary requirements in S1 shall be specified for 15.24-mm [0.600-in.] diameter uncoated seven-wire steel strand if needed for applications in prestressed ground anchors.