9-44 Section 905. Steel Reinforcement
905.01 General Requirements
Steel reinforcement for use in concrete structures and pavements must meet the requirements of this section.
905.02 Testing
Test s teel reinforcement in accordance with ASTM A370, ASTM E8/E8M , or other specified ASTM, AASHTO , or Department methods, as modified by this section. If requested, provide the Engineer with two copies of the chemical analysis of reinforcing bars in accordance with the relevant ASTM specifications.
905.03 Bar Reinforcement for Structures
Deformed steel bars used for non- prestressed concrete reinforcement must meet the requirements of AST M A615/A615M , ASTM A706/A706M , or ASTM A996/A996M (Type A or Type R) for Grade 60 steel bars, unless otherwise required. Deformed steel bar s used for prestressed concrete reinforcement must meet the requirements of ASTM A615/A615M, ASTM A706/A706M, or ASTM A996/A996M (Type A) for Grade 60 steel bars, unless otherwise required.
A.Bending . Shop cold bend bar reinforcement to the shapes shown on the plans . Complete all field bending cold. Do not heat bars during bending. The diameter of a bar bend, measured on t he inside of the bar, must meet the requirements of Table 905- 1. Table 905- 1: Minimum Bend Diameters ASTM Bar Designation No. Minimum Inside Diameter of Bend (bar diameters) No. 3 – No. 8 6 No. 9 – No. 11 8 No. 14, No. 18 10 Stirrups and ties, No. 3 – No. 5 4 Cut and bend bars in accordance with the CRSI Manual of Standard Practice and the ACI Detailing Manual . MDOT Standard Specifications for Construction Section 905 9-45 B. Bundling and Tagging . Ship bar reinforcement in standard bundles, tagged and marked in accordance with the CRSI Manual of Standard Practice .
C.Epoxy Coating . Epoxy -coated steel reinforcement bars must be coated in accordance with ASTM A775/A7775M . Epoxy-coated steel -welded wire reinforcement must be coated in accordance with ASTM A884/A884M, Class A, Type 1 . The following exceptions and additions apply :
1.Select coating material from the Qualified Products List.
2.The Department may test samples to verify thickness of coating, adhesion of coating, and holidays . Coat more steel reinforcement than shown on the plans to allow splicing to replace steel reinforcement removed for test samples.
3.Include written certification from the coating applicator that the steel reinforcement was cleaned, coated, and tested in accordance with ASTM A775/A775M (for reinforcing bars ) or ASTM A884/A884M (for reinforc ing wire ).
4.Repair damage to the coating in accordance with subsection 706.03.E.8.
D.Bar Chairs and Wire Ties for Epoxy-Coated Steel Reinforcement . Bar chairs and wire ties required for placing and fastening steel reinforcement must conform to the following:
1.Bar chairs must be plastic -coated wire, epoxy -coated wire, or plastic.
2.Wire ties must be plastic -coated wire, epoxy -coated wire, or molded plastic clips.
3.Tie-down wires must be plastic coated.
905.04 Bar Reinforcement for Pavements
Bar reinforcement for pavement tie bars and bars for use as dowels for load transfer in pavement expansion joints and contraction joints must meet the requirements of section 914.
905.05 Dowels and Bar Reinforcement for Curb, Glare Screen, Concrete
Barriers, and Filler Walls Deformed steel bars must meet the requirements of ASTM A615/A615M, ASTM A706/A706M , or ASTM A996/A996M (Type A or Type R) for Grades 40, 50, or 60 as applicable. MDOT Standard Specifications for Construction Section 905 9-46 905.06. Steel -Welded Wire Reinforcement Deformed steel -welded wire reinforcement must meet the requirements of ASTM A1064/A1064M and be fabricated as required.
905.07 Strand for Prestressed Concrete
Strands for prestressed concrete must have a 0.500- inch nominal diameter and a 0.153-square-inch cross sectional area or a 0.6000-inch nominal diameter and a 0.217-square-inch cross sectional area and must meet the requirements of ASTM A416 /A416M for Grade 270, l ow relaxation strand, as required. Identify each reel or pack number and provide a Test Data Certification, including a load elongation curve to at least 1% elongation. Protect prestress strands from physical damage, rust, and contaminants.
905.08 Tendons for Lateral Post Tensioning of Box Beams
Tendons for lateral post tensioning of box beams must meet the requirements of ASTM A416 /A416M for Grade 270 steel strand or ASTM A722/A722M for high-strength steel bars. If selecting bars, consider the tolerances allowed in manufacturing and placing precast concrete box beams and determine the required bar lengths accordingly.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 854–856 of 1,146.