717 - BRIDGE OVERLAYS
700-93 Secure a smooth riding bridge deck , correcting surface variations exceeding ⅛ inch in 10 feet by use of an
approved profiling device, or other method approved by the Engineer. For decks without the bid item Bridge Deck Grooving, finish the deck with the rough burlap drag. For decks with the bid item Bridge Deck Grooving, see subsection 710.3f. for grooving requirements.
e.Curing and Protection. Cure and protect according to subsection 710.3e .
f.Weather Limitations. See SECTION 401 . Also, discontinue concreting operations when a descending air temperature in the shade and away from artificial heat falls below 45ºF except with written approval from the Engineer. Do not start or resume operations until an as cending air temperature reaches 40ºF, or if night time temperatures are expected to fall below 35ºF.
g.Limitations of Operations. When a new deck is involved, do not commence work on the wearing surface until the lower course meet s the time requirements of SECTION 710 , unless specified otherwise. Do not place concrete adjacent to a surface course, less than 36 hours old. This restriction does not apply to a continuation of placement in a lane or strip be yond a transverse joint in the same lane or strip. In areas where there is no traffic, preparation of the area may be started in a lane or strip adjacent to newly placed surface the day following its placemen t. If this work is started before the end of the 7- day curing period, restrict the work as follows: Sawing or other operations may interfere with the curing process in the immediate work area for the minimum practical time only; Resume the curing promptly upon completion of the work; Keep the exposed areas damp until such time as curing media is replaced; and Do not use power driven tools heavier than a 15-pound chipping hammer.
h.Construction Joints. Make construction joints (either longitudinal or transverse) by placing and finishing the overlay approximately 6 inches beyond the desired location of the construction joint. After the overlay is cured, make a vertical saw cut at the location of the construction joint and chip away the excess overlay.
i.Sealing Vertical Faces of the Overlay. Seal all construction joints and vertical faces (such as the edge at the curb line) of th e overlay. Sand or shot blast the construction joints and vertical faces, and apply a concrete masonry coating to the cleaned vertical surfaces according to SECTION 726 . This work is subsidiary to the overlay.
j.Correction of Unbonded Areas. If during construction of the project, newly overlain areas are discovered to be unbonded by tapping or chaining, outline the concrete from such areas by sawing, remove it with small air tools (15-pound maximum) and replace it at no additional compensation. 717.4 METHOD OF MEASUREM ENT AND BASIS OF PAYMENT The Engineer will measure portland cemen t concrete overlay by the square yard. The Engineer will measure material for portland cement concrete overlay by the cubic yard according to the following:
1.When approved by District on repair of existing bridges, this pay item will be used to compensate the Contractor for the additional overlay material that will be required to fill the areas greater than the thickness of overlay shown in the Contract Documents. The Contractor is responsible for maintaining adequate quality control of the demolition process to minimize deviations from the plan grades.
2.The Engineer will keep a running account of the volume of overlay material that is produced and delivered to the deck. When approved, the Contractor will be paid, at the set price per cubic yard, for all overlay material in excess of 110% of the theoretical volume to cover the deck area with the thickness of overlay shown in the Contract Documents. When shown as a bid item in the contract, the Engineer will measure for payment bridge deck grooving by the square yard. Payment for "Portland Cement Concrete Overlay" and "Bridge Deck Grooving" at the contract unit price and "Material for Portland Cement Concrete Overlay (Set Price)" at the contract set unit price (when approved by the District Engineer) is full compensation for the specified work. 718 - ELASTOMERIC CONCRETE
700-94 Section 718
ELASTOMERIC CONCRETE 718.1 DESCRIPTION Construct elastomeric concrete acco rding to the Cont ract Documents. 718.2 MATERIALS Provide materials that comply with DIVISION 1500 . 718.3 CONSTRUCTION REQUIREMENTS Provide the Engineer with a copy of the product manufacturer’s instructions for use of this material. Mix, transport, place and cure the elastomeric c oncrete as recommended by the material manufacturer. Provide a technical representative of the material ma nufacturer at the jobsite during the initial placement of the elastomeric concrete. The manufacturer’s representative shall provide technical expertise regarding the mixing, transporting, placement, and curing of the elastomeric conc rete. This requirement may be waived for experienced contractors. Submit request for waving a technical representative, al ong with a list of successfully completed elastomeric concrete projects, to the Engineer. 718.4 MEASUREMENT AND PAYMENT The Engineer will not measure the elastomeric concrete separately; it will be subsid iary to other items of the contract. 719 - EXPANSION JOINTS
700-95 Section 719
EXPANSION JOINTS 719.1 DESCRIPTION Install expansion joints as designated in the Contract Documents. Do not substitute joint material without approval of the Stat e Bridge Office. B I D I T E M U N I T S Expansion Joint (*) Linear Foot *Strip Seal Assembly, Preformed Elastomeric Neoprene, Preformed Elastomeric Compression, Membrane Sealant** or other **Type 719.2 MATERIALS
a.General. Provide the type of expansion joint system designated in the Contract Documents that complies with DIVISION 1500 . When specified in the Contract Documents, use rapid set concrete patching material according to SECTION 1716 .
b.Strip Seal Assembly. Provide strip seal assemblies and preformed pressurized elastomeric neoprene and compression joint s eals that comply with DIVISION 1500 . Fabricate the strip seal assembly and ar moring and support systems according to DIVISION 700 .
c.Preformed Elastomeric Neoprene. Provide preformed elastomeric neop rene joints that comply with
Division 1500
d.Preformed Elastomeric Compression. Fabricate the preformed elasto meric compression joint seals to extend across the roadway in 1 piece. Th e material may be trimmed at the ends.
e.Membrane Sealant. Provide membrane sealant that complies with DIVISION 1500 . 719.3 CONSTRUCTION REQUIREMENTS
a.Strip Seal Assembly. Submit shop drawings according to SECTION 105 for each location, type and model of strip seal assembly used, according to DIVISION 700 . The Contractor is responsible for preparing shop drawings and coordinating the fabrication of the strip seal assemblies that require structural steel protection angles with the fabricator of th e structural steel angles. Install the strip seal assemblies according to the Contract Documents and the manufacturer’s recommendations. Provide a technical representative of the material manufacturer at the jobsite during installation. Place either a butt joint at each break in the pavement cross slope, or bend a unit of the device to comply closely to the break in cross slope. Do not field cut the device without approval of the Engineer. If the assembly is installed in sections, show the seque nce of unit installation on the shop drawings. Install the first unit and adjust it so that the anchor bolts shall center in the mounting slots. Install washers and tighten bolts to the torque recommended by the manufacturer. Wire brush both e nds of the successive units, a nd butt them ti ghtly against installed units. Do not apply the sealant until the unit is ready to be bolted down. Cut the corner at the face of curb, and grind to match normal curb dime nsions. Tighten all bolts and scrape excess sealant off the surface. If the assembly is installed in one continuous length with no fi eld splices, proceed with the installation in a uniform manner to maintain continuity of the seal. Complete final sealing of the finished expansion joint as soon as possible after installation. Fill all bolts, exposed ends, joints between units and other areas of possible leakage with sealant. Scrape excess sealant away before it has set.
b.Preformed Elastomeric Neoprene and Compression Joint Seals. When constructing the concrete forms for the ends of the bridge deck and adjacent abutment backwalls, form block-outs for the preformed elastomeric 719 - EXPANSION JOINTS
700-96 compression joint seals, according to the Contract Documents. The block-outs in the poured concrete must be uniform
in depth and width, and free of irregularities. Before installing the elastomeric joint seals, thoroughly clean the surfaces of the indentation formed for the elastomeric joint material, and swab it with a uniform coating of the lubricant-adhesive as recommended by the manufacturer. Install the elastomeric joint ma terial according to the manufactur er’s recommendations. Use equipment capable of placing the strips at the speci fied depth without increasing or decreasing the length as taken from the roll or box by more than 5%. Recess the top of the installed joint material a minimum of ⅛ inch, and a maximum of ⅜ inch below the top of the roadway deck adjacent to the joint material.
c.Membrane Sealant. Provide a technical representative from the material manufacturer at the jobsite during installation. Installation will not begin unless representative is present. Verify the joint opening size is correct based on the ambient temperature, correct as required. The minimum ambient air temp erature during the installation and curing process is 40 o F. Just prior to the sealant being applied, clean the faces of the joint by sa nd blasting each joint face followed by an air blast to clean incompressibles from the joint. Solvent clean bridge or approach joint surfaces. To obtain complete bonding with the adhesive, the concrete must be surface dry. Apply the epoxy adhesive to the prepared concre te joint surfaces according to the manufacturer recommendations. Install the membrane sealant material into the joint, positioning it either flush with, or with a maximum recess of ½ inch from the top surface of the joint, however recommended by the manufacturer. Apply the manufacturer recommended splice adhesive liberally to both mitered ends of the 2 sections of membrane sealant material that w ill meet in the joint as the final step before installation. Install successive lengths of memb rane sealant material by maintaining pressure toward the previously installed section while positioning the length being installed. Do not stretch the membrane sealant material. Provide an air supply that is proven to be oil free prior to blast cleaning and air blasting. This is done by covering the end of the air hose farthest from the compresso r with a white rage and discharging air for 10 seconds in the presence of the Engineer.
d.Other Expansion Joints. Provide a qualified representative of th e expansion joint system manufacturer to instruct the Contractor and KDOT pe rsonnel in the correct installation procedures for the expansion joint system used. Prepare the expansion gap area and install the expa nsion joint system accordin g to the manufacturer’s recommendations. Allow the expansion joint system to cure as recommended by the manufacturer before permitting traffic on the joint. The Engineer will inspect the expansion gap area for th e proper depth, width and alignment, as shown in the Contract Documents. 719.4 MEASUREMENT AND PAYMENT The Engineer will measure expansion joints by the linear foot, measured along the centerline of the expansion joint. Payment for "Expansion Joint (*)" at the contract unit price is full compensation for the specified work. 720 - SLIPFORMING CONCRETE BARRIER FOR BRIDGES
700-97 Section 720
SLIPFORMING CONCRETE BARRIER FOR BRIDGES 720.1 DESCRIPTION At the Contractor’s option, slipform the concrete barrier for the bridge. 720.2 MATERIALS Provide Grade XX (AE)(SA) concrete for the bridge barrier that complies with SECTIONS 401 & 402 and SECTION 1102 with these exceptions: Determine the percent air using Kansas Test Method (KT-19); and The maximum slump allowed is ½ inch. Provide set retarder admixture and liquid membrane forming compound Type 1-D, clear or translucent with fugitive dye that complies with DIVISION 1400 . 720.3 CONSTRUCTION REQUIREMENTS Form the ends of the bridge barrier. Brace all formed sections. Include bolt holes in the pattern and location required for installing guardrail. Form barrier sections with bridge name plates, deck drain boxes, light standards and expansion devices a minimum of 4 feet on each side of these locations. Before placing concrete, check the clearance betwee n the slipform machine and the reinforcing steel throughout the length of the barrier. While placing the concrete barrier, monitor the reinforcing steel at the entrance to the slipform machine to verify location and clearance. Brace reinfo rcing steel to prevent racking. Place concrete in the uphill directi on when slipforming concrete barriers on bridges with grades exceeding 2%. See DIVISION 700 for curing times required for the deck before using construction equipment or concrete delivery on new bridge decks. If using trucks to deliver concrete to the slipform machine, limit the quantity of concrete each truck is allowed to haul to the load carrying capacity of the bridge, or 75% of the truck’s rated capacity, whichever is less. Control the speed of vehicles entering or leaving the deck in order to limit deck movement. Except for vehicles necessary for the concrete placement operations, limit heavy vehicles on the bridge deck for 24 hours following the concrete placement of the barrier. Construct a test section approximately 100 feet lo ng to demonstrate the accepta bility of the slipforming method. Repair or replace the test section, and form the remaining barrier in th e conventional manner if the Engineer rejects the test section. Correct surface irregularities and other defects. W ith the Engineer’s approval of the methods, repair or remove and replace unacceptable portions of the barrier. Following the slipforming, lightly broom both sides of the barrier vertically. Broom the top of the barrier perpendicular to the longitudinal axis of the barrier. Cut contraction joints as shown in the Contract Do cuments without spalling, just prior to initial set. Apply 2 coats of curing compound immediately afte r the brooming operation. The minimum application rate is 1 gallon per 250 square feet of barrier for both ap plications. Apply the second application immediately after the first application, and at right angles to the first application. 720.4 MEASUREMENT AND PAYMENT Slipforming of concrete barrier is not measured for payment. 721 - HANDRAIL FOR BRIDGES AND OTHER USES
700-98 Section 721
HANDRAIL FOR BRIDGES AND OTHER USES 721.1 DESCRIPTION Fabricate and erect the metal handrails according to the Contract Documents. B I D I T E M S U N I T S Bridge Handrail (*) (**) Linear Foot H a n d r a i l ( * ) ( * * ) L i n e a r F o o t * Type ** Size 721.2 MATERIALS Provide materials that comply with DIVISION 1600 . 721.3 CONSTRUCTION REQUIREMENTS
a.General. Fabricate, weld, paint and erect the metal handrails according to DIVISION 700 . Before ordering or fabricating the materials, submit shop drawings to the State Bridge Office for approval (SECTION 105) . Store handrail materials above ground on platforms or skids, with spacer blocks to keep the members separated. Protect the stored mate rials from contaminants and moisture. Before placing concrete, protect the portion of the anchor bolts above the finished concrete line with wrappings or coatings of a release material. Use a template to verify the correct spacin g and alignment of the anchor bolts. Remove the wrappings or coatings before erecting the handrails. Before erecting the handrail posts, true the concrete surfaces where the posts will rest. Grind the concrete surfaces for proper seating, when required. Erect the handrail by groups of post s corresponding to the length of each rail piece. Fully support handrail by posts at the time it is placed. The maximum deviation allowed from the correct alignment is ⅛ inch. Abrupt breaks in alignment must be corrected. Drifting of holes during assembly is permitted only to bring the parts into position. Do not enlarge the holes or di stort the metal. Use beveled washers on beveled surfaces to give full bearing to both the head and nut. After the handrail is erect ed, align it and tighten the nuts on the anchor bolts.
b.Steel Handrail. Erect the handrail to line and grade using surveying instruments. Shim the handrail posts as required. For shims ⅛ inch or greater, use either steel or sheet lead shims. Only use 1 shim per post. Unless the handrail is galvanized, apply 1 shop coat of paint after fabrication and one finish coat of paint after erection. Apply 2 shop coats of paint to surfaces that are inaccessible after assemb ly or erection. See SECTION 714 for painting requirements.
c.Aluminum Handrail. Erect the handrail to line and grade using surveying instruments. Shim the handrail posts between the post and concrete surfaces, or between the post and base plate, as required. Use aluminum shims. If the shims are in contact with another metal or the co ncrete surfaces, coat the shims with caulking compound, or paint the shims with paint specifically used on aluminum, or use a synthetic rubber gasket. 721.4 MEASUREMENT AND PAYMENT The Engineer will measure handrail from the center of e nd post to center of end post by the linear foot. Payment for the "Bridge Handrail" or "Handrail" at the contract unit prices is full compensation for the specified work. 722 - SIGN STRUCTURES AND BRIDGE MOUNTED SIGN ATTACHMENTS
700-99 Section 722
SIGN STRUCTURES AND BRIDGE MOUNTED SIGN ATTACHMENTS 722.1 DESCRIPTION Fabricate and erect bridge mounted sign attachments and sign structures to support signs over or adjacent to highways and streets as designated in the Cont ract Documents. The structures consist of: footings, including electrical groundin g and conduit sleeves, when applicable; vertical support poles; vertical end support units; overhead trusses; structural attachment assembly; truss type arm; and maintenance walkway. Remove, modify and reset the existing sign structures as designated in the Contract Documents. B I D I T E M S U N I T S Bridge Mounted Sign Attachment (*)(**) Each Butterfly Overhead Sign St ructure (*)(**) Each Cantilever Sign Structure (*)(**) Each Overhead Sign Structure (*)(**) Each Overhead Sign Structure (Mas t Arm Type) (*)(**) Each Overhead Sign Structure (Single Tapered Tube) (*)(**) Each Remove and Reset Sign Structure (***) Each Reset Sign Structure (***) Each Sign Structure Modifica t i o n ( * * * ) E a c h * Size or Size Group ** Type of Material 722.2 MATERIALS Provide materials that comply w ith the applicable requirements. Grade 4.0 Concrete ................................................................................................ SECTIONS 401 & 402 Aggregates for Concre te Not On Grade ................................................................ SECTION 1102 Cementitious Grout ............................................................................................... DIVISION 1700 Castings ................................................................................................................. DIVISION 1600 Structural Steel ...................................................................................................... DIVISION 1600 Reinforcing Steel ................................................................................................... DIVISION 1600 Steel Fast eners ....................................................................................................... DIVISION 1600
a.General. Provide new, unweathered materials of the type, and complying with the sizes, dimensions and tolerances shown in the Contract Documents. Submit shop drawings according SECTION 105 . Include a "cutting list" or "shop bill" that provides the piece mark length, outside diameter and wa ll thickness of each piece used in the fabrication of the st ructure. Provide an erection sketch, detailing the locati on of each piece in the final assembly. Do not perform any fabrication until the approved shop drawings are in the hands of the Inspector and fabricator, and the Engineer has authorized fabrication. Any purchase of materials before fabricati on authorization is at the Cont ractor’s risk. Changes to approved shop drawings are subject to the approval of the Engineer. Submit revised sheets of the same size as those originally approved. Mark each bundle or package of material with letters, numbers or a combination of letters and numbers that are identified in the test report for that material. Mark e ach piece of material with lette rs, numbers or a combination of letters and numbers that are identifie d in the shop drawings. The marking mu st be legible, but not noticeable after erection of the structure. 722 - SIGN STRUCTURES AND BRIDGE MOUNTED SIGN ATTACHMENTS 700-100 b. Fabrication.
1.Shop Welding. Perform welding and repairs in accordance with SECTION 744 .
2.Test Loading. Test loading of fabricated tr usses is required only when inspection indicates the fabrication to be of doubtful or unacce ptable quality requiring repairs before acceptance. Test load the structure to demonstrate the adequacy of the repair. The C ontractor will bear the cost of test loading.
c.Electrical Equipment and Materials. Provide the electrical equipm ent and materials shown in the Contract Documents. Submit to the Engineer for approval a schedule of electrical equipment and materials proposed for installation before beginning construction. Include catalog cuts, diagrams, drawings and other descriptive data required by the Engineer. 722.3 CONSTRUCTION REQUIREMENTS
a.General. Do not damage the existing cables and conduits . If necessary, relocate the existing cables and conduits to clear the footing locations. Repair or replace existing cable s and conduits damaged during construction of the footings. If temporary signs interfere with th e erection of the permanent signs, relocate the temporary signs to the locations determined by the Engineer. When "Contractor Construction Staking" is not shown as a bid item, the Engineer will stake the locations of sign structure footings. For each foot ing location, the Engineer will provid e the Contractor with the vertical measurement from the crown grade of the pa vement to the top of the footing. Erect the bridge mounted sign attachments and sign structures according the Contract Documents. If removing, modifying or resetting sign structures, do not damage the existing sign structures. Repair or replace, as directed by the Engineer , sign structures damaged through the negligence of the Contractor.
b.Concrete Footings. Construct the concrete footings accord ing to the Contract Documents. When placing the concrete, consolidate the concrete in the footings by rodding and vibrating. Allow the concrete footings to cure a minimum of 4 days before attaching the sign structures.
c.Sign Structures.
1.Bolted Joint Connections. Before assembling the si gn structures, use a soft wire brush to clean the contact surfaces of the bolted connections. Remove all corrosion and coatings, except galvanizing. Wipe the cleaned contact surfaces with rags soak ed with acetone, syol or toluol. Re move excess solvent from the contact surfaces using clean, dry rags. Assemble the sign structures accord ing to the Contract Documents. S eal all bolted join ts immediately, using a sealant intended for this purpose, and applied according to the sealant manufacturer’s recommendations.
2.Attachment to Anchor Bolts. Pl ace the sign structure with anchor pl ate on the anchor bolts. After all signs are mounted on the structure, and the sign pole (or bridge support) is plumb, proceed with anchor bolt tightening procedures. Fill the gap between the top of the footing and the bottom of the anchor plate with concrete grout according to the details in the Contract Documents.
3.All Sign Structures. Do not use a pipe wrench to tighten nuts on Sign Structures; Use only a box end or socket wrench to snug tighten nuts; Maintain a minimum dimension of 6 inches from the top of foundation to finished grade; With approval of the Engineer, repair any marring of the galvanizing caused while lifting the structure into place; Submit specifications for the hydraulic wrench to the Construction Engineer (who will contact the Signing and Lighting Engineer) for approval; and If the four refusal maximum is exceed ed on any DTI, discontinue tighten ing and contact the State Bridge Office; Grade the surrounding area to drain away from the structure.
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 424–431 of 978.