AASHTO M 31M/M 31-21 Standard Specification for Deformed and Plain Carbon and Low-Alloy Steel Bars for Concrete Reinforcement.pdf

Standard Specification for Deformed and Plain Carbon and Low-Alloy Steel Bars for Concrete Reinforcement AASHTO Designation:M 31M/M 31-211 Technically Revised:2021 Technical Submittee:4f Metals ASTM Designation:A615/A615M-20 AASHIO American Association of State Highway and Transportation Officials 555 12th Street NW Suite 1000 Washington D.C.20004 Standard Specification for Deformed and Plain Carbon and Low-Alloy Steel Bars for Concrete Reinforcement AASHTO Designation:M 31M/M 31-211 AASHIO Technically Revised:2021 Technical Submittee:4f Metals ASTM Designation:A615/A615M-20 1. SCOPE 1.1. This specification covers deformed and plain carbon and low-alloy steel concrete reinforcement bars in cut lengths or coils.Steel bars containing alloy additions such as with the AISI and SAE series of alloy steels are permitted if the resulting product meets all the other requirements of this specification.The standard sizes and dimensions of deformed bars and their number designations shall be those listed in Table 1.The text of this specification references notes and footnotes that provide explanatory material.These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this specification. 1.2. Bars are of three minimum yield strength levels:namely 280 MPa [40 000 psi] 420 MPa [60 000 psi] and 550 MPa [80 000 psi] designated as Grade 280 [40] Grade 420 [60] and Grade 550[80] respectively.Bars that have carbon contents limited to 0.30 percent or less and that meet the carbon requirements of this specification shall be designated as Type W.Bars that have carbon contents greater than 0.30 percent shall be designated as Type S. 1.3. Hot-rolled plain rounds in sizes up to and including 63.5 mm [2/2 in.in diameter in coils or cut lengths when specified for dowels spirals and structural ties or supports shall be furnished under this specification in Grade 280 [40] Grade 420 [60] and Grade 550 [80]. For ductility properties (elongati...