1002. 3(c) 1002. 3(d) Bend and Straightening Requirements (1) (2) Bar Size Carbon Equivalent Bend Temp. F Straighten Temp. F Bar Size Dia. of Former Inches Min. 4 through 7 Unknown 1400 -1500 1400 -1500 4 5 3 0.55 or less and A 706 70-100 or 1400 -1500 70-100 or 1400 -1500 6 7 5 8 Any 1400 -1500 1400 -1500 8 8 >8 Bending and straightening not recommended
• 450F to 600F • 1800F and greater
Note: A. Apply heat to sufficient area to encompass bend area.
placing and settling of concrete using metal chairs or acceptable supports. Do not allow bar spacing to vary from the design spacing by more than 1/2 inch. Do not allow the distance from the surface of the formwork to the bars to vary more than 1/4 inch from the design distance. Do not place reinforcement bars closer than 1.5 times the maximum nominal size of the aggregate used in the concrete mix design. Firmly tie bars with annealed iron wire or secur e the bars with acceptable metal clips. Tie bars at all perimeter intersections and at all intersections on the top mat of bridge decks and in bridge barriers. For other intersections, when bar spacing is greater than or equal to 12 inches, tie all intersections; when bar spacing is less than 12 inches, either tie all intersections or tie alternate intersections in each direction to provide a staggered tie layout. Tie bundled bars together at not more than 6- foot centers. When reinforcement bars are tied together and lifted into place as a unit, ensure stability of the unit and maintain proper bar alignment during lifting and placement operations. For epoxy -coated reinforcement bars and galvanized reinforcement bars , provide plastic -coated tie wire, epoxy -coated tie wire, metal clips, or plastic clips. When tying stainless steel reinforcement bars together, provide tie wire meeting one of the UNS designations as specified in Section 709.1(f) for stainless steel reinforcement bars. When attaching stainless steel reinforcement bars to any other dissimilar metals, provide 1/8-inch thick (minimum) nylon, polyvinylchloride, or polyethylene spacers or sheathing to ensure no contact between the reinforcement bars a minimum of 1 inch extending beyond the point of intersection in all directions. Use nylon or plastic coated wire ties to bind the spacers and/or reinforcement. When attaching uncoated, corrosion- re