00530.00 456 Section 00530 - Steel Reinforcemen t for Concrete
Description
00530.00Scope - This Work consists of furnishing and placing steel reinforcement of the grade, type
and size shown or specified.
Materials
00530.10Materials - Furnish Materials meeting the following requirements:
Deformed Bar Reinforcement ................................................................ 02510.10 Dowels .................................................................................................. 02510.50 Epoxy Coated Reinforcement ............................................................... 02510.11 Headed Bar Reinforcement ................................................................... 02510.25 Galvanized Coating ............................................................................... 02510.30 Mechanical Splices ................................................................................ 02510.20 Stainless Steel Chairs and Supports ..................................................... 02513.30 Stainless Steel Concrete Inserts ........................................................... 02513.35 Stainless Steel Dowels .......................................................................... 02513.50 Stainless Steel Mechanical Splices ....................................................... 02513.20 Stainless Steel Reinforcement Bar ........................................................ 02513.10 Stainless Steel Tie Wire ........................................................................ 02513.60 Welded Wire Fabric ............................................................................... 02510.40 Wire Reinforcement ............................................................................... 02510.60
00530.11Order Lists and Bending Diagrams - Before ordering Material , submit all order lists
according to 00150.37 and unstamped bending diagrams according to 00150.35 for approval. Do not order Material until such lists and bending diagrams have been approved. The review of order lists and bending diagrams by the Engineer will not relieve the Contractor of responsibility for the correctness of such lists and diagrams. Revise lists and diagrams as required to make them comply with the design drawings at no additional cost to the Agency.
Order lists and bending diagrams for reinforcement affected by stressing system in prestressing beams or post -tensioning systems such as anchorage design and duct placement will not be reviewed before the stressing system is reviewed.
00530.12Fabrication - Cold bend reinforcement bars to the shapes shown. Make bends, tag, mark
and ship reinforcement bars according to the current edition of the CRSI Manual of Standard Practice.
00530.13Miscellaneous Metal - Minor metal parts such as drains, bolts, concrete anchors, spacer
blocks, expansion and bearing devices, access hole covers and frames, anchor bolts, inserts and similar miscellaneous metal, unless otherwise provided, will be classified as reinforcement.
Pipe attached to or used in conjunction with bridge deck drains or catch basins will be classified as reinforcement.
00530.35 457 00530.14 Concrete Inserts - Furnish hot -dip galvanized expanded coil concrete inserts with closed -back ferrule threaded to receive UNC threaded bolts or rods of the size shown. Provide concrete inserts with the following minimum lengths and capacities:
Bolt or Rod Minimum insert Minimum Safe Working Load Diameter (Inches) Length (Inches) in Shear or Tension (Pounds)
3/4 4 1/2 4,000 1 5 1/2 6,000 1 1/4 7 1/2 10,000 1 1/2 9 1/2 16,000
Where stainless steel inserts are specified, furnish inserts meeting the requirements of 02513.35.
Labor
00530.30Mechanical Splice Installers - Provide qualified mechanical splice installers to construct
mechanical splices. To qualify an installer, provide the Engineer with three completed mechanical splice samples of each type and size to be installed on the Project for each mechanical splice installer, at no additional cost to the Agency. Prepare the splice samples as follows:
• Make splice samples in the presence of the Engineer using the same Materials, Equipment, and procedures that will be used on the Project. • Construct each splice sample according to the manufacturer's recommendations. • Construct each splice sample with two equal lengths of straight reinforcing bar so the total length of the assembled splice sample is at least 96 inches. • Mark each splice sample with the heat treatment lot number.
Provide splice samples that meet the requirements of 02510.20. For stainless steel reinforcement, provide splice samples that meet the requirements of 02513.20. Do not begin mechanical splice installation until the Engineer confirms, in writing, the qualification of each mechanical splice installer. The Engineer may suspend mechanical splice insta llation if the Contractor substitutes unapproved personnel during construction.
00530.35Headed Bar Reinforcement Installers - Provide qualified headed bar reinforcement
installers to construct headed bar reinforcement. To qualify an installer, provide the Engineer with three complete headed bar reinforcement samples of each type and size to be installed on the Project for each installer, at no additional cost to the Agency. Prepare the headed bar reinforcement samples as follows:
• Make samples in the presence of the Engineer using the same M aterials, Equipment, and procedures that will be used on the Project. • Construct each sample according to the manufacturer's recommendations. • Construct each sample so the total length of the assembly is at least 48 inches. • Mark each sample with the heat treatment lot number. Provide headed bar reinforcement samples that meet the requirements of 02510.25. Do not begin headed bar reinforcement installation until the Engineer confirms, in writing, the qualification of each headed bar reinforcement installer. The Engineer may suspend headed bar reinforcement installation if the Contractor substitutes unapproved personnel during construction.
00530.40 458 Construction
00530.40Protection of Material - Store reinf orcement above the surface of the ground on dunnage
Protect reinforcement from damage at all times. Ensure reinforcement is free of dirt, detrimental rust or scale, paint, oil and other foreign substances when placed in the Work . In addition to the req uirements above, store epoxy coated bars with supports close enough to prevent sagging in the bundles. Provide protective padding when bundles are stacked or when supported on metal. Store bars as close as practica ble to where they will be placed in the Structure . Cover bars with an opaque material during storage to protect them from exposure to sunlight and saline mist. Move bars to or from storage according to 02510.11( b) to minimize damage to the coating. Do not allow the total exposure time from bar delivery to concrete placement, while in storage or in place, to exceed 2 months.
00530.41Placing and Fastening - Place all reinforcement within the tolerances recommended in
the CRSI Manual of Standard Practice unless otherwise specified. Hold reinforcement firmly during the placing and setting of concrete.
according to the following:
• In top mats of footings and deck slabs, tie bars at all intersections except where bar spacing is less than 6 inches, tie bars at alternate intersections. • Tie all other bars at all intersections except where bar spacing is less than 1 foot in each direction, tie bars at alternate intersections. • Use precast concrete bar supports with approved shape and dimensions, and equal or greater compressive strength as the concrete to be placed. • When precast concrete bar supports are used, provide Wired Blocks. Provide tie wires meeting the requirements of 02510.60. Combination Blocks may be used in horizontal applications. Provide tie wires meeting the requirements of 02513.60 for blocks supporting stainless steel reinforcement. • Where at least one of the bars to be tied or supported is epoxy coated, provide tie wires that are either plastic or epoxy coated. • For bridge decks, support the bottom mat with precast concrete Wired Blocks or Combination Blocks. The wire ties need not be coated. Plastic bar supports are not allowed. • For bridge decks, support the top mat of reinforcing steel from the bottom mat with reinforcing bar supports according to Chapter 3 of the CRSI Manual of Standard Practice (SBU, BBU or CHCU) at 24 inch maximum centers. Plastic bar supports are not allowed. • When stainless steel rebar is specified, use stainless steel wire bar supports conforming to the requirements of ASTM A493, Type 430, stainle ss steel rebar Standees, or Class 1A epoxy coated wire bar supports. • Use plastic tipped feet or Class 2, Type A stainless steel tips if the feet of the support will be on an exposed surface. • Turn up the legs of steel wire bar supports a minimum of 1/8 inch. • Separate layers of bars with precast concrete bar supports or by other approved bar support devices. • Do not use pebbles, broken stone or brick, metal pipe or wooden blocks as bar supports. Tie stainless steel reinforcement only with stainless steel tie w ire meeting the requirements of 02513.60. 00530.42 459 Support stainless steel reinforcement with stainless steel metal chairs and continuous supports meeting the requirements of 02513.30. Do not allow direct contact between stainless steel reinforcement and steel reinforcement. When stainless steel reinforcing or dowels is located near steel reinforcing, use nylon or polyethylene spacers to maintain a minimum 1 inch clearance between the two metals and bind them with nylon cable ties. Where insufficient space exists t o maintain this minimum, either bar may be sleeved with a continuous polyethylene or nylon tube extending at least 1 inch in each direction past the point of closest contact between the two dissimilar bars.
• Provide the same surface clearance for ties and splices that is shown or specified for the reinforcement. • Maintain clearance distance from the forms with stays, precast concrete blocks, ties, hangers, or other approved supports. • Remove all precast member lifting devices pr ior to placing concrete deck reinforcement. • Ensure bridge deck clearances meet the requirements of 00540.48(g).
placing concrete. Concrete placed in violation of this provision may be rejected and removal required.
00530.42Splicing:
for those designated "full length".
If specific locations are designated for splices, make splices only at those locations, or use full - length bars.
In the absence of other directions, including bars designated "continuous," furnish reinforcing bars to provide the minimum practical number of bars. Where splicing is allowed, unless shown otherwise:
• Splice No. 11 bars and smaller by lapping, or with an approved mechanical splice. • Splice No. 14 bars and larger with an approved mechanical butt splice.
with at least three ties per splice
Where coated reinforcement is spliced to uncoated reinforcement, provide the required splice lap for the coated reinforcement unless shown otherwise.
recommended procedures. Use devices that join bars end- to-end if a butt splice is specified; otherwise bars may be lapped or joined end-to -end. All requirements for mechanical splices apply to mechanical butt splices.
Ensure mechanical butt -spliced reinforcing bars do not deviate from the layout line by more than 1/4 inch over a 3 foot length of bar. 00530.42 460 For staged constructi on, dowels may be replaced by reinforcing bars with threaded sleeve mechanical splice couplers embedded in the portion of concrete placed first and threaded reinforcing bars inserted in the couplers after forms are removed. Approval by the Engineer is required for the substitution. Construct assemblies that develop 12 5 percent of the specified minimum yield strength of the dowels shown or specified. Construct reinforcing bars that have effective splice or development lengths equal to the replaced dowels. When grout sleeve mechanical splices are allowed, submit a written installation plan at least 14 Calendar Days before splice installation. Include splice installation details including grouting operations, Equipment, Material, and testing requirements. Submit an installation plan that conforms to the Manufacturer's testing and installation recommendations. Provide written documentation, signed by the qualified mechanical splice installer verifying the splices were tested and installed according to manufacturer's recommendations and the Specifications . Also, submit copies of all test results.
Construct the three qualifying splice samples in the same orientation as the production splices.
splices at no additional cost to the Agency. All sample splices will be tested by the Agency at the Agency’s expense.
Subsection.
with two equal lengths of straight reinforcing bar so that the total length of the assembled sample is not less than 96 inches. M ark each splice sleeve with the heat treatment lot number.
• Submit one quality control sample for each 100 splices performed up to 500 splices, and then submit one sample for each 500 splices. Successful installer qualification according to 00530.30 satisfies quality control for the first 100 splices being installed. This sequence of testing will be required for each heat treatment lot used. • Make non-threaded mechanical spl ice quality control samples at the Project Site in a manner similar to that used for the production splices. • Fabricate threaded sleeve mechanical splice quality control samples on a random basis during the cutting of threads on the reinforcing bars and del iver to the Engineer at the Project Site with the material they represent. • Complete the splice according to the manufacturer's recommendations. • Quality control samples will be tested according to this Section. If any sample fails to meet the test criteria, the lot which it represents will be rejected until the cause of failure has been determined. Materials from a rejected lot may be accepted if they are shown to be free of the condition which caused the failure.
Engineer present will be rejected.
00530.47 461 Do not place stirrups and other reinforcing bars between a mechanical splice sleeve and the surface of the concrete where it would impair the specified clearance. Instead, place additional reinforcement as necessary at no additional cost to the Agency. When using epoxy coated reinforcing bars , coat mechanical splices prior to installation according to ASTM A775. After the splices are attached to the rebar, c oat exposed areas of bare steel and seal the rebar to splice interface with a manufacturer recommended patching material according to ASTM A775.
welder certification, Welding Procedure Specifications and Procedure Qualification Records to the Engineer for approval.
Provide a Certified Welding Inspector according to AWS D1.4 who:
• Performs visual inspection of Work performed by the certified welder. • Prepares, signs, and submits a signed report confirming the Work was performed according to AWS D1.4.
00530.43Splicing Welded Wire Fabric - Overlap sheets of welded wire fabric as sh own or provide
edge and end laps not less than one mesh in width. Securely fasten sheets at the ends and edges according to 00530.41.
00530.44Substitutions - Substitute different size bars only if approved
00530.45Inspection and Repair of Epoxy Co ated Rebar - Inspect coated bars before placement
for damage to coating. Before installation, patch all visual defects in the coating with a manufacturer recommended patchi ng material according to ASTM A775. Repair damaged coated areas as follows:
Remove all surface contaminants and damaged coating. Promptly repair prepared areas according to the resin manufacturer's recommendations and before detrimental oxidation occurs. If rust is present, remove it by blast cleaning or power tool cleaning methods im mediately before applying the patching material . Feather the patching material 2 to 3 inches, or as recommended by the manufacturer, into undamaged coated areas. Apply patching material to a thickness greater than 8 mils. Repair damage found after placement as specified above. Coating damage exceeding 2 percent of the surface area in any lineal foot section of a bar may be cause for rejection of that bar.
00530.46Marine Environment - On projects within 3 aerial miles of the Pacific Ocean, clean bars
with a high pressure washer (1,500 pounds per square inch minimum pressure, with a fan pattern, 4.5 gallons per minute capacity) just prior to placing concrete.
00530.47Headed Bar Reinforcement :
recommended procedures.
00530.80 462 (b) Sampling and Testing:
reinforcement at no additional cost to the Agency. All s ample headed bar reinforcement will be tested by the Agency at the Agency's expense.
Construct test headed bar reinforcement with straight reinforcing bar not less than 48 inches in length. Mark each headed bar with the heat treatment lot number.
• Submit one quality control sample for each 100 headed bars installed up to 500 headed bars, and then submit one sample for each 500 headed bars . Successful installer qualification according to 00530.35 satisfies quality control for the first 100 headed bars being installed. This sequence of testing will be required for each heat treatment lot used. • Complete the headed bar reinforcement according to the manufacturer's recommendations. • Quality control samples will be tested according to this Section. If any sample fails to meet the test criteria, the lot which it represents will be rejected until the cause of failure has been determined.
reinforcement installed without the Engineer present will be rejected. When using epoxy coated reinforcing bars, coat heads prior to installation according to ASTM A775 . After the heads are attached to the rebar, coat exposed areas of bare steel and seal the rebar to head interface with a manufacturer recommended patching material according to ASTM A775 .
Measurement
00530.80Measurement - The quantities of reinforcement will be measured by one of the following
methods:
reinforcement will be listed in the Special Provisions. The weight of reinforcement in prestressed beams, slabs, piles and other items where the reinforcement is included in those items will not be included in the listed estimated quantities. The weight of miscellaneous metal, based on weights listed in 00530.80(b) and Project quantities, is included in the estimated quantity of uncoated reinforcement.
reinforcement incorporated into the concrete based on the total computed weight for the sizes and lengths of bars as shown or authorized.
The following assumed densities will be used as a basis for computing the theoretical weight of miscellaneous metal: 00530.90 463 Steel - 490 pounds/cubic foot Copper - 555 pounds/cubic foot Cast Iron - 450 pounds/cubic foot Stainless Steel - 500 pounds/cubic foot
The weight of mesh will be computed from the theoretical weight of plain wire. If the weight per square foot is shown, that weight will be used.
For the purpose of computing weight of reinforcement, weights published in the CRSI Manual of Standard Practice will be used. The weight of reinforcement in prestressed beams, slabs, piles and other items where the reinforcement is included in those items will not be included in the listed quantities.
If bars are substituted at the Contractor's request, and as a result, mores teel is used than specified, only the amount specified will be included in the pay quantities. When laps are made for splices for the convenience of the Contractor, the extra reinforcement will not be included in the pay quantities.
Payment
00530.90Payment - The accepted quantities of reinforcement will be paid for at the Contract unit
price, per unit of measurement, for the following items: Pay Item Unit of Measurement
The grade of reinforcement will be inserted in the blank.
Item (a) includes fabricating and placing uncoated reinforcement as specified. Item (b) inc ludes placing epoxy coated reinforcement as specified. Item (c) includes fabricating and placing stainless steel reinforcement as specified. Payment for reinforcement will be made when the reinforcement is incorporated into the concrete.
Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified .
No separate or additional payment will be made for clips, wire, separators, wire chairs, or other Material used in fastening the reinforcement in place.