4-49 Payment will be made under:
Pay Item Pay Unit Bridge Approach Slabs, Sta. ____ Lump Sum
425-1 Description
Furnish, fabricate and place steel reinforcement other than wire reinforcement, including all related materials such as tie wire, separators, wire bar supports, mechanical butt splices for reinforcing steel, and other material for fastening the reinforcing steel in place; galvanize and/or coat where required; and fabricate, cut, bend, place and splice the reinforcement in conformity with the shape and dimensions shown in the plan s and as specified in these specifications . Provide epoxy coated reinforcing s teel where indicated in the plan s.
425-2 Materials
Refer to Division 10. Item Section Epoxy Coated Reinforcing Steel 1070 -7 Epoxy Coated Spiral Column Reinforcing Steel 1070 -7, 1070 -8 Mechanical Butt Splices for Reinforcing Steel 1070 -9 Reinforcing Steel Bar Supports 1070 -4 Spiral Column Reinforcing Steel 1070 -8 Steel Bar Reinforcement 1070 -2 Wire Reinforcement 1070 -3
425-3 Protection of Materials
Protect steel reinforcement at all times from damage and make sure it is free from dirt, dust, loose mill scale, loose rust, paint, oil or other foreign materials at the time of placement in the work. Store epoxy coated reinforcing steel bars at the project site at least one foot above the ground on wooden or padded supports placed 10 feet apart, and completely cover with an opaque cloth, canvas or woven fiber reinforced polyethylene white tarp. Do not use solid plastic sheeting. Cover the bars such that adequate ventilation is provided to prevent condensation from forming on the material during storage, and completely protect the bars from direct sunlight. Do not allow water to pond under the epoxy coated reinforcing steel. Store epoxy coated bars as close as possible to their final location in the structure to prevent coating damage from unnecessary handling. Do not store epoxy coated bars at the project site from one construction season until the following construction season unless stored in a waterproof enclosure.
425-4 Placing and Fastening
Accurately place reinforcement as shown in the plan s and secure firmly in position by wiring at intersections and using metal bar supports, precast mortar blocks or other approved devices of sufficient strength and location to resist distortion. Tie reinforcing bars at all intersections except where spacing is less than one foot in both the longitudinal and transverse directions, in which case tie at alternate intersections, as an option. Securely cross tie each int ersection of vertical reinforcing steel and spiral reinforcement for drilled piers with double wire . Use plastic or epoxy coated spiral spacers with epoxy coated spiral column reinforcing steel.
4-50 Provide wire bar supports for reinforcing steel in accordanc e with Article 1070 -4 of the proper
height to provide the distance from the forms and the proper spacing between rows of steel as indicated in the plan s. When required by the plans, epoxy coat bar supports in accordance with
Article 1070 — 7. Provide rust -proofed supporting legs for wire bar supports that rest on the forms
as provided in Article 1070- 4. When providing rust proofing by plastic protection, make sure that the dipped plastic coating or premolded plastic tips are intact on each bar support leg while concrete is placed. Cast blocks, of approved shape and dimensions, for holding vertical reinforcement in position from 1:2 mortar or concrete of the same mix used in the member being cast. Cure precast blocks in accordance with Article 420- 15 for the water method or the polyethylene sheeting method. To hold vertical bars in position, use precast blocks which have embedded wires extending from the block a sufficient distance to tie to the bar. Roll wire reinforcement flat before placing concrete, unl ess otherwise shown in the plan s. Hold wire reinforcement firmly in place against vertical and transverse movement by acceptable means. Weld reinforcing steel in accordance with the American Welding Society's Reinforcing Steel Welding Code AWS D1.4 and only where required in the contract. Obtain written approval for additional welding. Do not use tack welds unless approved. Exercise extreme care when transporting, handling, placing and tying epoxy coated reinforcing steel to prevent damage to the coating. Immediately before placing epoxy coated reinforcing steel bars in the forms, visually inspect each bar for coating damage. Ensure that all coating damaged by any cause is satisfactorily repaired, including hairline cracks and that each bar, including ba r ends, is completely encapsulated in epoxy coating or patching material at the time of concrete placement. Make coating repairs as described in Subarticle 1070 -7. Do not coat more than 5% of surface area on each bar with patching material including patc hing due to damage to the coating by the coater, fabricator, transporter or contractor. The patching limits do not include holiday repairs, overspray and coated ends of bars. Do not expose epoxy coated reinforcing steel to the weather for more than 30 days after placing in the forms. If the concrete is not placed within 30 days, cover the epoxy coated reinforcing steel as required by Article 425 -3. Place, allow sufficient time for inspection and obtain approval from the Engineer for reinforcement in any m ember before placing concrete. Do not place reinforcement while placing concrete in the member involved.
425-5 Splicing
A.General Furnish all reinforcement in the full lengths indicated in the plan s. Do not splice bars without written approval except where shown in the plan s. Provide splice lengths as shown in the plan s. Overlap sheets of wire reinforcement with each other as shown i n the plans or approved working drawings to maintain a uniform strength and securely fastened to each other at the ends and edges. Lap at least the dimension of one wire reinforcement .
B.Mechanical Butt Splices Provide mechanical butt s plices for reinforcin g steel in accordance with Article 1070- 9 when called for in the plan s. Splice the bars in accordance with the manufacturer’s recommendations using the manufacturer’s required accessories as approved by the Engineer. Use mechanical butt
4-51 splices only where specified in the plans. Any additional splices require approval by the
Engineer .
425-6 Measurement and Payment
Reinforcing Steel or Epoxy Coated Reinforcing Steel will be measured and paid as the number of pounds of steel bar reinforcement, reinforcing wire and plain rods shown in the plan s as being necessary to complete the work. Where the plans are revised, the quantity to be paid is the quantity shown on the revised plans. Where directe d to deviate from the plans ; chang ing the quantities of steel bar reinforcement , reinforcing wire and plain rods necessary to complete the project ; the quantity shown in the plan s is increased or decreased by the theoretical computed weight of reinforcing steel added or subtracted by the change. Spiral Column Reinforcing Steel or Epoxy Coated Spiral Column Reinforcing Steel will be measured and paid as the number of pounds of spiral column reinforcing shown in the plan s as being necessary to complete the wo rk. Where the plans are revised, the quantity to be paid is the quantity shown on the revised plans. Where directed to deviate from the plans ; chang ing the quantities of steel bar reinforcement, reinforcing wire and plain rods necessary to complete the p roject ; the quantity shown in the plan s is increased or decreased by the theoretical computed weight of spiral column reinforcing steel added or subtracted by the change. The quantity of reinforcing steel or spiral column reinforcing steel shown in the pla ns is an estimate based on the theoretical computed weight of the steel necessary to complete the work and will be used for pay purposes. No revision in this pay quantity nor any adjustment in the contract unit price for Reinforcing Steel or Spiral Column Reinforcing Steel will be made except where revisions in the plans affect the quantity of reinforcing steel or spiral column reinforcing steel necessary to complete the work or where an error has been found in the estimate of steel shown in the plan s. If the elevation of the top of a footing or the tip of a drilled pier is raised by a distance not exceeding 3 feet, and the reinforcing steel or spiral column reinforcing steel for the substructure unit has been fabricated before the elevation was raised, no decrease in the quantity of steel to be paid will be made from the theoretical weight of steel shown in the plan s for the original substructure unit. Under the above circumstances the provisions of Article 109- 6 will not apply as the steel not used in the work shall remain the property of the Contractor and payment for such steel will be made as provided above. No separate payment will be made for the cost of cutting off reinforcing steel or spiral column reinforcing steel as payment at the contract unit price per pound for the item of Reinforcing Steel or Spiral Column Reinforcing Steel will be full compensation for cutting the steel. There will be no direct payment for reinforcing steel when the basis of payment or compensation clause applicable to a par ticular section of the specifications states that payment at the contract unit or lump sum prices for the work covered by such section will be full compensation for furnishing and placing reinforcing steel. No separate payment will be made for the work of furnishing and placing wire reinforcement as payment at the contract unit price for the item or items covering the structure containing the wire reinforcement will be full compensation for such work. These p rices and payments will be full compensation for all items required to fabricate and place reinforcement. Payment will be made under: Pay Item Pay Unit Reinforcing Steel Pound Epoxy Coated Reinforcing Steel Pound Spiral Column Reinforcing Steel Pound Epoxy Coated Spiral Column Reinforcing Steel Pound
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 185–187 of 857.