OVERLAY OF CONCRETE BRIDGE DECKS 505.03 335 SECTION 505
505.01 Description
This work consists of preparing deck surfaces and placing a concrete, multilayer polymer concrete, or asphalt membrane overlay on a bridge deck and the approach pavement to provide a smooth transition to the main line pavement.
505.02 Materials
Provide materials in accordance with the following section and subsections: Material: Section or Subsection: Portland Cement Concrete 701.01 High Density Concrete for Bridge Deck Repair and Overlay 701.1 Latex Modified Concrete for Bridge Deck Overlays 701.11 Early Strength Concrete for Bridge Deck Patching and Overlays 701.2 Type N - Epoxy -Urethane Copolymer Overlay System 701.13.B.(13) Waterproof Membrane for Asphalt Overlay 712.09 Reinforcing Steel for Structures 511 Provide the following overlay types as required by the Contract: High density concrete (HDC), Latex modified concrete (LMC), Early Strength concrete (ESC), or Other materials as required by the Contract.
505.03 Equipment
Provi de equipment with traps, filters, drip -pans, or other devices to keep oil and deleterious material off the deck. Use the following types of surface preparation equipment as required by the Contract:
A.Hydrodemolition Equipment Provide hydrodemolition equipment with a filtering and pumping unit that operates with self-propelled, computerized equipment. Ensure the hydrodemolition equipment uses a high pressure water jet that can remove unsound concrete in a single pass. Provide equipment capable of pro ducing a minimum pressure of at least 13,000 psi [90 Mpa] and selectively removing all deteriorated and unsound concrete in one pass.
B.Mechanical Scarifying Equipment Use self -propelled equipment to maintain accurate depth of cut and slope. Use equipmen t that automatically establishes profile grades along both edges of the machine by referencing the bridge
505.03 Overlay of Concrete Bridge Decks
336 deck with a ski or matching shoe, or by an independent grade control. Equip with an integral loading device that removes the materials cut from the b ridge deck and discharges them into a truck in a single operation.
C.Vacuum Cleanup Equipment Provide vacuum cleanup equipment that cleans hydrodemolition and milling debris. Use a vacuum system equipped with dust control devices that remove wet debris a nd water in the same pass. Provide equipment that washes the deck with pressurized water before vacuuming to dislodge debris and slurry from the deck surface.
D.Shot Blast Cleaning Equipment Provide shot blasting equipment with oil traps.
E.Hand -Held Bl ast Cleaning Equipment Provide hand -held blast equipment for sand blasting or water blasting to expose fine and coarse aggregates. Provide water blasting equipment that delivers at least 25 gpm [95 L/min] at 4,000 psi [28 Mpa].
F.Sawing Equipment Provide saws that cut concrete to the depth required by the Contract .
G.Power -Driven Hand Tools Provide power -driven hand tools, jack hammers, and chipping hammers no heavier than the 15 lb [7 kg] class.
H.Proportioning and Mixing Equipment
1.HDC Use proporti oning and mixing equipment in accordance with Subsection 414.03, “Equipment,” for high density concrete. Provide volumetric proportioning on a mobile mixer with continuous mixing or a stationary concrete mixer with rot ating -paddles.
2.LMC and ESC Provide proportioning and mixing equipment of a self -contained, mobile, continuous -mixing type (volumetric based units) in accordance with the following: Provide a self -propelled mixer that can carry enough dry and unmixed ce ment, sand, coarse aggregate, and latex modifier to produce and place at least 5 yd³ [5 m³] of concrete mix uninterrupted. Equip mixers with a visible recording meter and ticket printout to document start the quantity of cement going into the mix. Provide mixers with a positive control for the water flow and latex emulsion into the mixing chamber. Use a flow meter to document start flow rate. Provide calibrated mixers to proportion and blend the composition continuously or intermittently as required by the Contract. OVERLAY OF CONCRETE BRIDGE DECKS 505.03 337 I. Placing and Finishing Equipment
1.Placing Equipment For placing and pre -screeding, use hand tools to place stiff plastic concrete to the strike off level of the screed.
2.Finishing Machines Use a finishing machine that can screed concrete within 12 in [300 mm] of the face of the curb or parapet wall. Extend the screed at least 6 in [150 mm] beyond the sides of the placement section, overlapping placed courses, overlay forms, and existing and planned saw -cut edges. Ensure each screed has p ositive controls for the vertical position, the tilt angle, and the crown shape. Power and gear the machine to maintain smooth operations in send and reverse. Raise the screed to clear the screeded surface for traveling in reverse. Use a machine capable of final screeding within 10 min of depositing the concrete on the deck. See Table 505:3, “Concrete Overlay Placement Rates,” for other production rate specifications. Support the machine on adjustable rails (not shimmed) to obtain the profile shown on the Plans. If placing concrete in a lane that abuts a completed lane, equip the machine to travel on the completed lane without damaging its surface. Provide deck foggers and misters on the deck finisher and work bridges in accordance with Subsection 504.03.B, “Fogging Equipment. ”
3.Special Notes for High Density Concrete Use a mechanical strike -off to provide a uniform thickness of concrete in front of the oscillating screed for high density overlay. Equip the oscillating screed to consolidate the concrete to 98 percent of the unit weight in accordance with AASHTO T 121. Install identical vibrators along the screed length on 5 ft [1.5 m] maximum centers. Make the bottom face of this screed at least 5 in [125 mm] wide with a turned -up or rounded leading edge to prevent surface tearing.
4.Special Notes for Latex Modified Overlays For latex modified overlays, use a finishing machine equipped with at least two finishing devices: A vibr ating screed that consolidates the modified composition to 98 percent of the rodded unit weight, and either A vibrating oscillating screed, or A finishing device with at least one rotating cylindrical drum no longer than 4 ft [1.2 m]. Equip the vibrating s creed for latex modified concrete with positive control of vibration so that vibration frequency can be varied between 3,000 vibrations per minute and 6,000 vibrations per minute. Make the bottom face of the screed at least 4 in [100 mm] wide.
J.Special Notes for Polymer Concrete Overlays
1.Mechanical Equipment Provide a polymer distribution system, a mechanical aggregate spreader, and a self -propelled sweeper broom or vacuum truck. Provide compressed air that is without oil and water.
505.04 Overlay of Concrete Bridge Decks
338 (2) Hand Applica tions Use calibrated containers, a paddle -type mixer, squeegees, rollers, and a broom to mix the resin and apply resin and aggregate in accordance with the manufacturer’s recommendations.
3.Night Construction Provide lighting in accordance with Subsection 509.04.C(3)(c), “Lighting.” for night work.
505.04 Construction Methods
A.General Provide controls to limit dust. Perform concrete work in accordance with Section 509, “Structural Concrete.” Protect traffic under the bridge and adjacent to the work zone while removing bridge deck concrete.
B.Work Plan Before work begins, submit a work plan to the Engineer. Allow 14 days for the Engineer’s review. Include the following in the work plan: Planned work schedule including the following: Traffic control, Project phasing, Surface preparation, Production rate, Patching cure times, and Estimated time for overlay placement; Forming details; A list of project specific equipment to remove concrete, including hand tools; If using hydrodemolition, a plan for treating water used to remove concrete; For Concrete Overlays: A list of project specific equipment and back -up equipment for the following concrete procedures: Mixing, Placing, Consoli dating, Finishing, and Curing; A list of on -site equipment and material quantities for protection from rainy, cold, and hot weather; Concrete mix designs, and the expected travel time for delivery and placement; An outline of the process used for concrete, including the following rework areas: Removal, Surface preparation, Delivery, OVERLAY OF CONCRETE BRIDGE DECKS 505.04 339 Placement, Consolidation, Finishing, and Curing; and A list of checks that will ensure the overlay meets the dimensions shown on the Plans and the quality required by the Contract. For polymer concrete overlays, include the following additional items in the work plan: The compatibility of patching materials with the polymer concrete overlay material, The minimum air and deck surface temperatures, The manufacturer approval o f the work plan and the number of courses and minimum cure times for each course, The manufacturer’s written support of approval for any deviations from these specifications, and Necessary test reports, documentation, explanations, and justification to sup port the proposal. For asphalt membrane overlays, include the following additional items in the work plan: Type of membrane and tack that will be used, Limitations of pavement/deck temperature and moisture content, How the pavement/deck temperature and moi sture content will be measured, Length of time the membrane can be exposed before placing the asphalt overlay, Maximum temperature for the asphalt concrete overlay material, and How the curb line and deck drains will be sealed. Obtain authorization from th e Engineer to proceed before starting work.
C.Surface Preparation
1.Surface Preparation for Polymer Concrete Overlays Patch decks in accordance with subsection 513.04.C , “Deck Repairs and Patching .” Ensure patches obt ain required 28 day strength before placing overlay. Remove and dispose of existing overlays, asphalt, unsound concrete, and foreign material from the surface. Clean the deck surface by shot -blasting or water -blasting in accordance with Subsection 505.03.D, “Shot Blast Cleaning Equipment.” Shot -blast in accordance with International Concrete Repair Institute (ICRI) level 6 -7 after sand -blasting. Before placing the overlay, ensure the deck has no visible moisture. Test for moisture by taping a plastic sheet to the deck for at least 2 hr in accordance with ASTM D 4263 or other Engineer approved methods. Place overlay on hydraulic cement concrete of the Contract required strength. 505.0 4 OVERLAY OF CONCRETE BRIDGE DECKS 340 Shot Blast in accordance with the following: Protect metal deck drains and areas of the curb or railing above the proposed surface from the shot blast. Shot blast the surfaces specified in the plans and follow with an air blast using dry, oil free air or vacuum. Brooming is not acceptable. Remove all pavement marking, loose disintegrated concrete, dirt, paint, oil, asphalt laitance carbonation and curing materials from patches and other foreign material from the surface of the deck. Produce a surface reli ef equal to the International Concrete Repair Institute (ICRI) Surface Preparation Level 6 to 7 or ASTM E 965 Pavement Macrotexture Depth of 0.04 to 0.08 inch. Place the first coat of the polymer concrete overlay within 24 hours of preparing the deck surfa ce. Prepared surfaces exposed for more than 24 ours must be lightly sand blasted prior to application of the overlay.
2.Surface Preparation for Concrete Overlays Use a shot -blast or water -blast to prepare the surface for new decks. For existing decks, prepare deck surfaces using hydrodemolition, vacuuming, shielding, and water control. Scarify (mill) in conjunction with hydrodemolition. Provide controls to limit dust. Use jack hammering and other Engineer -approved methods to place the new concrete ov erlay where hydrodemolition cannot be used. Remove and dispose of existing overlays, asphalt, unsound concrete, and foreign material from the surface in accordance with Subsection 104.09 “Removal and Disposal of Salvag ed Materials Structures and Obstructions, ” and Subsection 107.01 “Laws Rules and Regulations To Be Observed.” Provide a rough, bondable surface at the depth shown on the Plans. Use the Contract required overlay materi al for deck patching. Monolithically place this material for the partial depth repairs. Make full depth repairs before placing the overlay in accordance with Section 513, “Repair of Concrete Bridge Decks.” Place expansion join ts as required by the Contract.
a.Decks with Overlays Remove the overlay with scarification before hydrodemolition for decks with overlays. For decks without overlays, scarify before hydrodemolition. Unless reinforcing steel is encountered, scarify dec k surface leaving last 1/2 in [12 mm] to be done by hydrodemolition.
b.Damage of Reinforcing Steel Immediately stop and adjust the removal depth if the mechanical scarifying equipment snags the top mat of deck reinforcing steel. Repair or replace damage d and dislodged reinforcing at no additional cost to the Department. Remove additional concrete to position the new reinforcing steel at the height shown on the Plans and Contract required lap splice lengths using a 15 lb [7 kg] chipping hammer at an angl e of no more than 45° from horizontal.
c.Hydrodemolition Perform the following if using hydrodemolition for surface preparation: Shield traveling public from debris. Block drains, expansion joints, and areas where water can drain from the deck. OVERLAY OF CONCRETE BRIDGE DECKS 505.04 341 Provide s ediment basins to strain water before releasing it. Adjust drainage treatment until the released water runs clear. Provide a technical field representative on the project site during calibration and hydrodemolition surface preparation operations. Calibrat e the hydrodemolition equipment on an area of sound concrete, and verify that every square inch of the deck is uniformly blasted. Establish the rate of travel and water pressure to selectively remove the deteriorated concrete. Selectively remove deteriora ted concrete using pressures in the range of 13,000 to 20,000 psi [90 to 140 Mpa]. Calibrate the equipment by moving it to an area with unsound concrete to verify that the proposed settings are adequate to remove the unsound concrete after calibration. Modify these settings, if necessary, to remove concrete to the minimum depth shown on the Plans. Hydrodemolish the top surface of the reinforced concrete bridge deck to make a rough and bondable surface. Wash the deck surface with pressurized water to dislo dge debris and slurry. Before the debris and slurry dry, use a high powered vacuum cleaner to clean the deck in one pass. Remove dried material at no additional cost to the Department. Sound the dry deck and mark unsound areas. Repeat the process if the hydrodemolition surface preparation does not leave a bondable surface, remove unsound concrete, rust, oil, asphalt, or other foreign matter, and leave a clean etched concrete surface free of laitance. Splice exposed reinforcing steel if more than 20 percen t of the reinforcing steel section bar area is lost. Where more than one half the reinforcing steel is exposed, handwork areas with 15 lb [7 kg] chipping hammers at 45° angles from horizontal to provide at least ¾ in [20 mm] of clearance around the bar. M inimize the amount of reinforcing steel exposed during hydrodemolition. Use hand -held blast cleaning equipment or 15 lb [7 kg] chipping hammers to clean and provide a bondable surface of the portion of the curb, the parapet wall, or both at the edge of the new overlay.
d.Grouting for High Density Concrete Scrub a thin, even coating of bonding grout into the dry, prepared surface before placing high density concrete. Prevent grout from collecting in pockets. Limit the application rate to ensure the grout does not dry before concrete placement. Since grout will dry on a vertical surface more rapidly than on the flat deck surface, carefully maintain the grout according to the surface condition.
e.Surface Wetting for Latex Modified Concrete or Early Stren gth Concrete Before placing latex modified concrete, clean the repair areas with air blast, then flush them with water. Keep the surfaces wet for at least 1 hr, and remove puddles before placing latex modified concrete.
505.04 Overlay of Concrete Bridge Decks
342 D. Mixing
1.High Density Concrete Mix high density concrete at the project site in accordance with Subsection 414.04.C, “Mixing Concrete.”
2.Latex Modified Concrete Mix and proportion latex modified material in accordance with the following:
a.Meas urement of Material Use a mobile continuous mixer to proportion latex modified concrete material for the Contract required mix. Calibrate the mixer for each material in the Engineer’s presence. Operate the mixer at the manufacturer’s recommended speed. Make yield checks.
b.Mixing of Material Mix material uniformly and in accordance with the equipment manufacturer’s recommended procedure. Finish at the rate specified in Table 505:3, “Concrete Overlay Placement Rates.”
E.Placing and Finishing Overlays
1.Pre-Placement Check Inspect and ensure the following with the Engineer at least 24 hr before placing the deck: The forms are mortar tight, cleaned, and oiled, Delaminations were removed by sounding the deck, The concrete surface is clean and bondable, Reinforcing steel is clean, Spliced -in new reinforcing steel replaces damaged reinforcing steel, Reinforcing steel coating damage is repaired, Ties are tight, Support provides a stable reinforcing steel mat, Clearances and sp acing meet dimensions and tolerances as required by the Contract, Finishing machine rails are stable, Equipment is operational, Back -up equipment is on site and does not leak oil or fuel, The dry run produces acceptable results for cover and clearance, The calibration of the mixing equipment produces the specified mix design and rate, Equipment and materials specified on the Work Plan for weather protection are in -place, and Identify locations for temperature readings during cure period.
2.Polymer Concre te Overlays Ensure a technical representative from the manufacturer is present during polymer concrete overlay operations. The representative will recommend the acceptability of all phases to the OVERLAY OF CONCRETE BRIDGE DECKS 505.04 343 Engineer, component mixing, and type and method of applicat ions. Prepare surfaces in accordance with 505.04.C(1), “Surface Preparation for Polymer Concrete Overlays” Sufficiently blend the polymer components, and uniformly cover the work area at the Contract required rate. Provide a finished overlay thickness that measures at least ¼ in [6 mm]from the highest point on the deck surface to the top surface of the polymer (not the peaks of the aggregate). Apply layers of polymer overlay separately, as the manufacturer recomme nds, and at the minimum rate specified in Table 505:1, "Polymer and Aggregate Coverage Rates." Ensure that the total coverage rate is at least 7.5 gal per 100 ft² [30 L per 10 m²]. Maintain polymer and aggregate compounds at a temperature of at least 60 °F [16 °C] during application. Unless the manufacturer recommends otherwise in writing, place the concrete overlay when the air temperature is no greater than 85 °F [29 °C], and is not expected to drop below 55 °F [13 °C] within 8 hr after application. Table 505:1 Polymer and Aggregate Coverage Rates Course Polymer, gal/100 ft² [1/10 m²] Aggregate, lb/yd² [kg/m²] 1 ≥2.5 [≥10] ≥10 [≥5.5] Additional ≥5.0 [≥20] ≥14 [≥7.7] Allow the overlay to cure before placing traffic on it to prevent wheel load damage. Cure in accordance with Table 505:2. Table 505:2 Minimum Curing Times for Overlay Courses Based on Ambient Temperature Course 60 °F – 64 °F 65 °F – 69 °F 70 °F – 74 °F 75 °F – 79 °F 80 °F – 84 °F ≥ 85 °F 1 4 hr 3 hr 2.5 hr 2 hr 1.5 hr 1 hr Additional 6.5 hr 5 hr 4 hr 3 hr 3 hr 3 hr a Cure course 2 for 8 hr if the ambient temperature falls below 60 °F during curing. If work damages the overlay surface, repair the damaged area by saw -cutting rectangular sections to the top of the concrete deck surface and replacing the courses at no additional cost to the Department.
3.Concrete Overlay
a.Dimensions Make HDC overlays at least 2 in [50 mm] thick. Make LMC overlays from 1½ in to 3 in [38 mm to 75 mm] thick. Limit the thickness of mixes with Early Strength Concrete (ESC) including RSLMC overlays in accordance with 701.20 “Early Strength Concrete for Bridge Deck Patching and Overlays” to 2 in [50 mm]. Limit the width of overlay passes to a maximum of 26 ft [8 m].
505.04 Overlay of Concrete Bridge Decks
344 (b) Joints
1.High Density Concrete Saw the previously placed high density concrete overlay course to hav e straight and vertical edges at transverse and longitudinal joints before placing the adjacent overlay course. Before placing new concrete, remove slurry from prepared areas.
2.Latex Modified Concrete Install transverse bulkheads to the thickness of the latex modified concrete layer, and equal to the grade and profile shown on the Plans before placing concrete.
c.Finishing Machine Setup Adjust the finishing machine to the overlay profile shown on the Plans. Place finishing machine rails outside the c oncrete area. Positively anchor the rails to give them horizontal and vertical stability. Anchor a hold -down device only into concrete that will be resurfaced. Submit working drawings for anchoring support rails for Engineer approval. Before placing co ncrete, make a dry run with the finishing machine to check the anticipated overlay thickness. Attach a filler block with a thickness ⅛ in [3 mm] less than the overlay thickness to the bottom of the screed. With screed guides in place, pass the screed ove r the area to be concreted. Correct screed elevations areas to provide the Contract required clearance.
d.Placement Place concrete overlay continuously in accordance with Table 505:3. In case of an interruption in latex modified concrete placement, ins tall a transverse bulkhead. During delays less than 1 hr, use several layers of wet burlap to protect the end of the placement from drying. Vibrate the surface screed and the internal fresh concrete that is at least 3 in [75 mm] thick. Table 505:3 Concr ete Overlay Placement Rates Total Overlay Area per Bridge, yd² [m²] Minimum Placement Rate, yd³/hr [m³/hr] 0 – 298 [0 – 249] 1.0 [0.75] 299 – 477 [250 – 399] 1.5 [1.15] 478 – 658 [400 – 550] 2.0 [1.50] >658 [>550] 2.5 [1.90]
e.Work Bridges Always use at least two movable work bridges during concrete placement. Use one work bridge for fogging the surface and finishing. Use the other to apply curing material.
f.Evaporation Control and Curing Control evaporation and cure overlay in accordance with Subsection 504.04.E(5). OVERLAY OF CONCRETE BRIDGE DECKS 505.04 345 (g) Temperature Limitations Keep the concrete temperature for the overlay material from 55 °F to 85 °F [13 °C to 30 °C]. Implement the following cold weather practices if the air temperature falls below 55 °F [13°C] from 24 hr befo re to 6 hr after placement or the substrate temperature falls below 55 °F [13°C] at the time of placement: Ensure the concrete mix temperature at least 75 °F [24 °C] during placement. Schedule the placement during rising temperatures and at the warmest par t of the day. Place mixes with ESC when air and deck temperatures rise above 45 °F [7 °C].
4.Asphalt Membrane Overlays Ensure a technical representative from the manufacturer is present during asphalt membrane operations. The representative will recommend the acceptability of all phases to the Engineer, including the surface preparations, placement of the membrane including flashing for the curbs, appropriate use of tack coats, primers and type and method of applications. Place the waterproof mem brane, primers and tack coats in accordance with the manufacturer’s specifications, instructions, and provisions. Lap the membrane at least 6 in [150 mm] longitudinal lap. When placing membrane, ensure that the membrane temperature is at least 50 °F [10 °C]. Extend the membrane 10 ft [3 m] beyond each end of the bridge onto the approaches. Seal the curb lines of the waterproofing membrane using a method of treatment recommended by the manufacturer. Unless otherwise directed by the manufacturer, roll th e waterproofing membrane with a pneumatic roller. Vibratory rollers are not to be used during pavement application. When applying asphalt concrete overlay, use asphalt temperatures in accordance with the mix design. Ensure the asphalt temperatures do no t exceed the limits for the membrane in use.
F.Acceptance Testing for Overlays
1.Tensile Strength Test The Engineer will choose test sites. Notify the Engineer 24 hr before performing the tensile strength test. Provide at least one tensile test site f or each span or at least one test site for each 300 yd² [250 m²] of deck surface. Test in accordance with ASTM C 1583. Ensure the tensile test has a minimum strength of 250 psi [2 Mpa]. If failure occurs prior to reaching 250 psi, it must occur with 100 percent of the failure in the existing concrete deck. Submit result documentation to the Engineer.
2.Straightedge Test Test the overlay before saw -cut grooving the surface with a straightedge 10 ft [3 m] long. Lay it parallel and then transverse to th e centerline. Grind high areas greater than ⅛ in [3 mm] from the lower edge of the straightedge.
G.Longitudinal and Transverse Groove Final Finish for Overlays For concrete overlays, saw -cut longitudinal and transverse grooves in accordance with Subsection 504.04. F, “Longitudinal and Transverse Grooving. ”
505.06 Overlay of Concrete Bridge Decks
346 H. Limitation of Operations During the curing period required by the Contract, keep traffic off the finished surface, and do not prepare work on areas adjoining the new concrete.
505.05 Method of Measuremen T
The Engineer will not measure Class A and Class B repairs necessitated by hydrodemolition for payment. The Engineer will measure Saw-Cut Grooving in accordance with Subsection 506.05, “Method of Measurement.”
505.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.BRIDGE DECK CONCRETE OVERLAY Square or Cubic Yard [Square or Cubic Meter]
B.REMOVING EXISTING OVERLAY Square Yard [Square Meter]
C.MULTIPLE LAYER POLYMER CONCRETE OVERLAY Square Yard [Square Meter]
D.ASPHALT MEMBRANE OVERLAY Square Yard [Square Meter]
E.HYDRODEMOLITION Square Yard [Square Meter] The Department will pay for bridge deck repairs in accordance with Section 513, “Repair of Concrete Bridge Decks.” Include the cost of reinforcing steel, sawing, removals, lighting, and incidental items in the contract unit price for the relevant overlay pay item. The Department defines hydrodemolition as variable depth overlay. The Department will consider the costs of variable depth to be included in the contract unit price for Bridge Deck Overlay . In the case of variable dept h, the Department will not measure Class A or Class B patching for payment. No additional compensation will be provided for laps used for asphalt membrane overlays. STRUCTURAL STEEL 506.04 347 SECTION 506 STRUCTURAL STEEL
506.01 Description
This work consists of providing, fabricating, and erecting steel structures and structural steel portions.
506.02 Materials
Use materials in accordance with the following section and subsections: Material: Section or Subsection: Structural Steel 724.01 High -Strength Fasteners 724.02 Welding 724.03 Welded Stud Shear Connectors 724.04 Galvanizing 724.06 Shafting for Pins and Rollers 725.01 Steel Castings 725.02 Iron Casting s 725.03 Bronze Castings 725.05 Paint -Inorganic Zinc/Epoxy/Urethane System 730.02.A Elastomeric Bearing Pads 733.06
506.03 Equipment — Vacant
506.04 Construction Methods
A.General For the fabrication of main -load carrying members, use a structural steel fabricating plant certified under AISC Quality Certification Programs in the Major Steel Bridges Category. For fracture critical members, use a fabricator who has unrestricted certification with an endorsement “F .” Fabricate all elements in accordance with ANSI/AASHTO/AWS/ D1.5, Bridge Welding Code. D1.5, Bridge Welding Code. Select design details in accordance with the AASHTO Standard Specification for Highway Bridges . Paint structural steel in accordance with Section 512, “Painting.” Paint exposed surfaces of non-weathering grades of steel unless galvanized or otherwise required by the Contract. Apply inorganic zinc primer to the top flange of girders. The Department will not allow pain ting of weathering steel unless required by the Contract. Blast -clean superstructures made of weathering steel in accordance with SSPC -SP6, “Commercial Blast Cleaning.”
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Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 349–360 of 935. View official source ↗