594SECTION 419—BRIDGE CONDUIT SYSTEMS AND LIGHTING SYSTEMS
419.01 Description
This work shall consist of furnishing and installing bridge conduit systems and/or bridge lighting systems in accordance with these specifications and in conformity with the lines and details shown on the plans or as established by the Engineer.
419.02 Materials
Conduit, boxes, and fittings shall conform to Section 238.
419.03 Procedures
The Contractor shall verify or locate the origin of power sources when modifying or relocating existing electrical systems and shall advise the Engineer at least 48 hours prior to the anticipated time of de- energizing the electrical system. Materials and workmanship shall conform to the standards of NEC and the requirements of the local power company. Conduit, fittings, and electrical items shall be installed in accordance with their respective requirements in Section 700.
419.04 Measurement and Payment
Bridge conduit systems, when a pay item, will be paid for at the contract lump sum price per structure. When not a pay item the cost thereof shall be included in the price for other appropriate pay items. Bridge lighting systems will be paid for at the contract lump sum price per structure. Payment will be made under: ——————————————————————————— Pay Item Pay Unit——————————————————————————— Bridge conduit system (B or Str. No.) Lump sum Bridge lighting system (B or Str. No.) Lump sum——————————————————————————— SECTION 420—ADHESIVE-BASED JOINT SEALING SYSTEMS
420.01 Description
This work shall consist of furnishing and installing preformed elastomeric joint sealer in accordance with these specifications and in conformity with the lines shown on the plans or as established by the Engineer.
420.02 Materials
Adhesive based joint sealers shall include three classes of joint sealing systems:419.01 595(a) Class I joint system shall be comprised of a preformed, extruded polychloroprene (neoprene) material having serrated sidewalls, which is air pressurized and bonded in place with a structural epoxy adhesive..
b.Class II joint system shall be comprised of inverted ‘V’ shaped, preformed, extruded silicone rubber or EPDM (ethylene propylene diene monomer rubber) seal material bonded in place with a structural adhesive.
c.Class III joint system shall be comprised of preformed, pre-compressed, self-expanding joint system with silicon pre-coated surface bonded in place with a structural epoxy adhesive. Adhesive-based joint sealer and structural adhesive shall conform to Section 212.
420.03 Procedures
a.Joint Preparation: The joint shall be formed to provide the nominal opening at the specified temperature as shown on the plans. For no-plan projects, the Contractor shall request information concerning the nominal opening and the specified temperature from the Engineer. Sides of the joint shall be parallel to each other. Edges of concrete or epoxy mortar adjacent to the joint shall be rounded to a radius of not more than 1/4 inch or constructed with a chamfer. The Engineer may require joints having an insufficient opening to be sawed or ground to the proper size. The Contractor may furnish a larger-size sealer, up to 4 inches in its uncompressed width as determined by the Engineer, if a joint opening is larger than specified. If the joint opening is larger than that which will accommodate the larger sealer, the Contractor shall cut back the end of the slab at least 6 inches and rebuild it with Class A4 concrete to obtain the required joint opening. The Contractor shall bear the cost of such additional work or material unless designated in the Contract as a pay item. Existing joints shall be prepared or reconstructed in accordance with Section 412. The work required to prepare or reconstruct existing joints will be measured and paid for under the appropriate items as shown in Section 412. The Contractor shall thoroughly clean the joint by abrasive blast cleaning followed by brushing and or oil free compressed air, so that it is free from dust, oil, grease, or other foreign materials.
b.Installation: The Contractor shall install the joint sealer system using methods and procedures recommended by the manufacturer of the system. A lubricant adhesive shall be used. The finished joint shall provide a watertight expansion joint seal system according to the manufacturer’ s instruc - tions. The joint seals shall be installed along the entire width of the deck and shall extend at least 18 inches up each side of the bridge barrier or parapet. Bridges with curbs rather than barriers or parapets shall have joint material installed in the entire width of the curb. No field splices will be allowed unless recommended by the manufacturer and approved in writing by the Engineer. The sealer shall be installed for proper depth below the surface of the adjacent roadway as detailed on the plans or as directed by the Engineer. The top surface of the sealer, after installation, shall remain recessed below the surface of the adjacent roadway during its full movement cycle. The joint system shall seal the deck surface, gutters, curbs, and parapets to prevent water and other 420.03 596contaminants from seeping onto the superstructure or the substructure. Prior to the work being accepted by the Department the Contractor shall perform a leak test on tranverse joints in bridge decks and joints between decks and backwalls unless otherwise directed on the plans. The leak test shall consist of flooding the deck surface with water and observing the underside of the joints for evidence of leaks. The detailed procedure for the leak test shall be developed by the Contractor, in conjunction with the manufacturer, and submitted to the Engineer for review and approval prior to performing the test. The leak test shall expose the observed portion of the joint to positive hydraulic pressure for a period of no less than 30 minutes. In the event of a leak, the joint shall be repaired in accordance with the manufacturer’ s recommendations. Joints other than transverse joints in bridge decks or between decks and backwalls do not require leak testing. Working drawings showing the complete details and dimensions of the adhesive based joint sealer system and other pertinent information, such as required special shop fabrication necessary for installation of practical watertight joints in the deck, gutters, curbs, and parapets, shall be submitted to the Engineer for review in accordance with the requirements of Section 105.10. The Contractor shall provide a factory-trained representative on the job site prior to and during the initial installation of the joints. Joints of all classes shall be installed only within temperature ranges recommended by the manufacturer.
1.Class I Joint Systems The joint sealer shall be bonded with a two component epoxy adhesive and pressurized during the adhesive cure time. Install all components utilizing the manufacturer’ s recommended adhesive for complete installation. Pressurization shall be performed through a valve with cap system. The profile is pressurized during installation and curing time of the adhesive to assure complete bonding throughout gap/ profile surfaces. Air pressure will bleed itself with time or air valve can be released at any time after 24 hours of installation.
2.Class II Joint Systems The joint sealer shall be bonded to the joint interface with a structural adhesive as recommended by the manufacturer. A primer shall be used if recommended by the manufacturer. All joint interfaces must be completely dry prior to application of the structural adhesive. The joint seal cannot be installed immediately after precipitation or if precipitation is forecasted for the day. Install the joint seal in one continuous length. Prior to installation, clean the seal profile using a solvent approved by the manufacturer. Position the seal at the proper depth and apply structural adhesive along each side of the seal and fill per the following general procedure: • A backer rod may be installed to set the correct depth for the seal. • Apply a continuous 3/8” to 1/2” bead of adhesive to both sides of the joint interface. Apply adhesive approximately 1 1/2” from top of roadway.420.03 597• Fold seal and insert into the joint. Release seal and ensure full continuous contact with joint interfaces and the adhesive. • Apply a second bead of adhesive along each side of seal and fill to the top of the serrations. Do not apply adhesive above the serrated areas. The joint manufacturer’ s installation guidelines shall be consulted for the specific procedure in order to insure complete contact with joint interface and seal.
3.Class III Joint System The joint seal shall be bonded with field-applied epoxy adhesive. Install the joint seal system recessed from the surface such that when the field-applied injection band of silicone is installed between the substrates and the foam and silicone bellows, the system will be 1/2 inch down from the substrate surface. Changes in plane and direction shall be executed using factory-fabricated “universal 90” or custom transition assemblies supplied by the manufacturer.
c.Observation Period The Contractor shall be responsible for the functionality of the joint sealing system for a 12 month observation period beginning at the date of completion and acceptance of work. The Contractor must guarantee the functionality of the joint sealing system. To successfully complete the observation period, the joint sealing system must not exhibit any evidence of leakage during the first 12 months of service. If leakage develops as determined by the Department the Contractor will be notified and shall reseal or replace that section of the seal that leaked within 30 days of notification. The Contractoor shall be responsible for all labor, materials, tools and equipment necessary to effect the repair or replacement. The Contractor shall coordinate repair or replacement operations with the district Structure and Bridge office.
420.04 Measurement and Payment
Adhesive based joint sealer (class) (width), when a pay item, will be measured in linear feet along the pavement surface from out to out of the deck slab, complete-in-place, and will be paid for at the contract unit price per linear foot. This price shall include furnishing and installing the joint material in accordance with this section and the manufacturer’ s recommendations and all costs associated with the manufacturer’ s representative, leak testing, and observation period requirements. When not a pay item the cost thereof shall be included in the price for other appropriate pay items. Payment will be made under: ———————————————————————————— Pay Item Pay Unit———————————————————————————— Adhesive based joint sealer (Class) (Width) Linear foot————————————————————————————420.04 598SECTION 421—ELASTOMERIC EXP ANSION DAMS
421.01 Description
This work shall consist of furnishing and installing elastomeric expansion dams in accordance with these specifications and in conformity with the lines, elevations, and locations shown on the plans or as established by the Engineer.
421.02 Materials
Materials shall conform to Section 212.
421.03 Procedures
The Contractor shall submit working drawings showing the complete details and dimensions of the expansion dam and other pertinent information, such as required special shop fabrication necessary for installation of practical leak-proof joints, to the Engineer for review and acceptance in accordance with Section 105.10. The Contractor shall provide a factory-trained representative on the job site prior to and during the initial installation of the expansion dam. Dams shall consist of elastomeric material and metal components arranged to provide for expansion and contraction movement of the bridge deck. Expansion and contraction movements between adjacent spans of the bridge deck shall be compensated for entirely by deformation of the elastomer component, without detriment to it, and shall cause no appreciable change in the elevation of the deck surface. The opening between the rigid portions of dams at the roadway level shall be not more than 3 1/2 inches at maximum expansion. Dams shall seal the deck surface, gutters, curbs, and parapets to prevent water and other contaminants from seeping onto the substructure. Dams shall have a continuous elastomeric membrane. The Engineer may allow field-vulcanized joints for each dam in accordance with plan details. Dams shall be cast in place, with top surfaces parallel to the bridge deck. Concrete shall be placed beneath the dam in a manner to prevent the formation of air pockets or segregation in the concrete. The Contractor shall complete final sealing of the finished expansion dam as soon as possible after instal - lation. Bolt cavities shall be wire brushed and filled with sealant. Edges of the dam, exposed ends, and other areas of possible leakage shall be filled with sealant. Sealant shall be smoothed to make seamless and flush contact with mating surfaces, and any excess scraped off before the initial set.
421.04 Measurement and Payment
Elastomeric expansion dams will be measured in linear feet of dam, complete-in-place, for the movement range specified and will be paid for at the contract unit price per linear foot. The movement ranges are 0 to 2, 2 to 3, and 3 to 4 inches. This price shall include furnishing, installing, components, 421.01
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 622–625 of 1,065.