AASHTO M 203M/M 203-20 Standard Specification for Steel Strand, Low-Relaxation Uncoated Seven-Wire for Concrete Reinforcement.pdf

Standard Specification for Steel Strand Low-Relaxation Uncoated Seven-Wire for Concrete Reinforcement AASHTO Designation:M 203M/M 203-20 Technical Submittee:4f Metals Release:Group 2(June) ASTM Designation:A416/A416M-18 AASHIO American Association of State Highway and Transportation Officials 555 12th Street NW.Suite 1000 Washington D.C.20004 Standard Specification for Steel Strand Low-Relaxation Uncoated Seven- Wire for Concrete Reinforcement AASHTO Designation:M 203M/M 203-20 AASHIO Technical Submittee:4f Metals Release:Group 2(June) ASTM Designation:A416/A416M-18 1. SCOPE 1.1. This specification covers two grades of uncoated low-relaxation seven-wire steel strand for use in pretensioned and post-tensioned prestressed concrete construction.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. 1.2. The values stated in either SI units or inch-pound units are to be regarded separately 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. 1.3. 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. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: ■T244 Mechanical Testing of Steel Products 2.2. ASTM Standards: ■ A981/A981M Standard Test Method for Evaluating Bond Strength for 0.600-in.[15.24-mm] Diameter Steel Prestressing Strand Grade 270 [1860] Uncoated Used in Prestressed Ground Anchors ■A1061/A1061M Standard Test Methods for Testing Multi-Wire Steel Prestressing Strand 2.3. IEEE/ASTM Standard: ■ SI 10 American National Standard for Use of the International System of Units (SI):The Modern Metric System ...