835.01 General.
STEEL REINFORCEMENT
835.01 General.
All reinforcing steel shall be Grade 60 {Grade 420} steel, unless otherwise stipulated in these Specifications or specifically designated by plan details. All steel reinforcement bars (smooth and deformed) must come from an ALDOT approved steel mill. Approved steel mills are listed in the Department’s Materials, Sources and Devices with Special Acceptance Requirements Manual, List I -12, Deformed and Plain Steel Bar Producing Mills. All reinforcing bars over 1/4 of an inch {6 mm} in diameter shall have deformations as prescribed in AASHTO M 31.
835.02 Reinforcing Bars.
Steel reinforceme nt bars 1/4 of an inch {6 mm} or less in diameter shall meet the requirements of AASHTO M 32. Steel reinforcement bars over 1/4 of an inch {6 mm} in diameter shall meet the requirements of AASHTO M 31.
835.03 Reinforcing Mesh or Mats.
WIRE FOR MESH REINFO RCEMENT. - Plain wire for mesh reinforcement shall meet the requirements of AASHTO M 32 . Deformed wire for mesh reinforcement shall meet the requirements of AASHTO M 225 . WELDED WIRE REINFORCEMENT. - Welded plain wire reinforcement mesh shall meet the requirements of AASHTO M 55 . Welded deformed wire reinforcement mesh shall meet the requirements of AASHTO M 221 . FABRICATED BAR OR ROD MAT. - Fabricated bar or rod mat shall meet the requirements of A ASHTO M 54.
835.04 Spiral Reinforcement.
Spiral reinforcement may be plain or deformed bars or may be cold drawn wire. Plain reinforcing bars shall conform (except for deformations) to AASHTO M 31, Grade 40 {Grade 300} or Grade 60 {Grade 420}. Deformed bars shall conform to Article 835.02. Cold drawn wire shall conform to AASHTO M 32.
835.05 Dowel and Tie Bars for Concrete Pavement.
a.Dowel Bars . Dowel bars shall be smooth round bars of the size shown by plan details. The bars shall be fabricated from steel conforming to AASHTO M 31 for Grade 40 or 60 {Grade 300 or 420}, or AASHTO M 227 for Grade 70 {Grade 480} or higher. The bars shall have a corrosion resistant coating conforming to the requirements of AASHTO M 254 for a Type A or Type B coating. One end of each dowel used in an expansion assembly shall be provided with an approved tight fitting non -collapsible expansion cap.
b.Tie Bars . Standard tie bars shall be of the size shown by plan details, fabricated from deformed bars meeting the requirements of AASHTO M 31 for Grade 40 or 60 {Grade 300 or 420}. Sectional tie bars shall be of the size shown by plan details fabricated from deformed bars meeting the requirements of AASHTO M 31 for Grade 60 {Grade 420} steel. Connectors shall be of a type approved by the Engineer.
835.06 Prestressing Steel.
a.Strand . Unless otherwise shown by plan details, stressing cables shall meet the requirements of AASHTO M 203 (ASTM A 416) Grade 1860 (270 ksi {1860 MPa}).
b.Bars. Stressing bars, when allowed by plan d etails, shall meet the requirements of AASHTO M 275 (ASTM A 722) for Type 1 or Type II with Mill Test Reports including Supplemental Requirements S1, S2 and S3, unless other requirements are provided by the plans or proposal.
836.01 General.
835.07 Use, Care, and Handling .
All reinforcement received on the project shall be placed in approved storage and shall be maintained clean, intact, and free from distortion. Reinforcement shall be free from loose or thick rust, which would impair bond of the steel with the concrete. R ust that produces only discoloration without reducing the cross section of the steel will not be considered objectionable. Only such reinforcement shall be distributed along the construction as needed for immediate use. SECTION 836 STRUCTURAL STEEL, FASTENERS AND MISCELLANEOUS METALS
836.01 General.
a.Marking of Steels . Steels, when received from the mill shall be identified in accordance with ASTM A 6 {A 6M}. On steel piling the heat number and section size shall be legibly marked on each piece by stamp, paint, tag, sticker or other industry accepted method. Any piece that cannot be properly identified at time of use will be rejected until such time documentation or approved testing of the items in question can prove conformance to the requirements. Certified mill test reports or certified reports of tests made by other agencies which are recognized by the ALDOT, shall be furnished for each heat of steel verifying that the material meets the requirements of the type an d grade specified. The Department reserves the right to make its own test of any material, and the material may be rejected if these tests prove the material does not meet the requirements. For identification purposes, the fabricator shall utilize low stress stencils to dye stamp the mill heat numbers of the flanges and webs in the webs of welded members and in the webs of rolled members. The heat numbers shall be legible, located adjacent to piece marks, and placed centered between the top and bottom flang e in the first panel to the left end and near side of the member. All steel which is required to have a yield point greater than 36,000 psi {250 MPa} shall, at all times in the fabricator's plant, be color marked to identify its AASHTO, ASTM, or special sp ecification.
b.General Requirements .
1.Structural steel shall conform to the requirements of AASHTO M 270 Grade 36 {Grade 250} unless otherwise noted hereinafter in this Section or shown on the plans. AASHTO material specifications shall govern in lieu of ASTM material specifications where an AASHTO equivalent specification exists for all references within any referenced specification. With the approval of the Engineer, materials (other than web and flange material and web splice and flange splice m aterial) for members may be taken from stock, provided the fabricator provides all documentation which shows the material conforms to the required specifications, prior to use of such material. The term “main member”, as used hereinafter in this section or shown on the contract plans, is defined as any member requiring Charpy V -notch ( CVN) testing. Structural steel members requiring Charpy V -notch testing shall include, but not be limited to, the following: • All rolled beams in the superstructure and steel pier caps. • All flanges and webs of steel plate girders and steel pier caps. • All cover plates for beams and girders. • All flange and web splice plates for beams, girders, and floorbeams or stringer beams. • All connection plates welded to rolled beams, steel plate girders, and steel pier caps. • All diaphragms or cross frames for curved beams and girders, including their gusset and connection plates. • All stringer beams (floorbeams) and any connection plates welded thereto.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 745–745 of 934.