601substructure members and shall include provision for connection to drainage outlets to prevent leakage of collected rainwater at any point along the joint or outlet. Final sealing of the finished joint shall be completed as soon as practicable after installation. Surfaces exposed to roadway traffic shall have antiskid provisions as indicated on the plans.
423.04 Measurement and Payment
Tooth expansion joint assembly will be measured in linear feet measured along the pavement surface from out to out of the deck slab for the tooth thickness specified and will be paid for at the contract unit price per foot. This price shall include furnishing and installing tooth expansion joint assembly, all necessary components and anchoring devices. Payment will be made under: ————————————————————————————— Pay Item Pay Unit—————————————————————————————Tooth Expansion Joint Assembly (Tooth thickness) Linear foot————————————————————————————— SECTION 424 - ASPHALT PLUG JOINTS
424.01 Description
This work shall consist of supplying and installing a blended polymer modified asphaltic binder and aggregate system in layers into a prepared expansion joint block-out on an asphalt concrete overlay on a concrete bridge deck. After installation and curing, the system will provide a flexible waterproof bridge joint which will allow for a joint movement of 1 inch in expansion and 1 inch of compression. The joint shall be placed at a nominal width of 20 inches and a thickness of no less than 2 inches.
424.02 Materials
a.Backer rod shall be expanded closed cell polyethylene foam capable of withstanding the elevated installation temperature (390°F) of the hot binder material and meet the specification requirements of ASTM D 5249.
b.Asphalt binder shall be thermoplastic polymeric-modified asphalt conforming to Table 1 of ASTM D 6297.
c.Aggregate shall be non-polishing of the Basalt, Gabbro or Granite group. All aggregates shall be crushed, double washed, dried and delivered to the job site pre-weighted in weatherproof, labeled bags. The gradation must meet the requirements of joint system manufacturer.
d.Steel backing plate shall conform to the specification requirements of ASTM A36/A 36M, and shall be galvanized in accordance with Section 233. The plate shall have a minimum thickness of 1/4 inch and a minimum width of 8 inches, unless otherwise noted by the joint system manufacturer.424.02 602(e) Asphalt plug joint systems shall conform to ASTM D6297 and shall be selected from the Materials Division’ s Approved Products List No. 77
424.03 Procedures
a.General: The Contractor shall submit complete and detailed working drawings of the asphalt plug joint system the Contractor proposes to use for review by the Engineer. The working drawings shall include materials, materials properties, installation procedures, storage, and handling requirements, and materials safety data sheets. The asphalt plug joint shall extend from face-of-curb to face-of-curb. The method for sealing joints in curbs or parapets shall be developed by the Contractor and approved by the Engineer prior to installation. The method for sealing joints in curbs or parapets shall be detailed on the working drawings. Asphalt plug joint systems shall be installed in accordance with the manufacturer’ s instructions. A manufacturer’ s representative shall be present during the entire installation to ensure satisfactory results are obtained. Asphalt plug joint systems shall allow total joint movement of up to 2 inches. The installation shall be centered over the expansion joint gap. The joint shall not be installed when the ambient or substrate temperatures are predicted to be below 40 degrees F at any time during the installation, when precipitation is imminent, or when otherwise prohibited by the manufacturer or the Engineer.
b.Installation: Existing pavement and/or existing joints shall be saw cut to the full depth required for installation of the new plug joint and removed in accordance with the plan details or as directed by the Engineer in order to form the joint block-out. Existing pavement and/or existing joints shall be removed with pneumatic hand tools. Waterproofing membranes, if present, shall also be removed. Small areas of deteriorated concrete in the block-out area shall be repaired with an approved material as directed by the Engineer. The entire joint block-out area shall be cleaned by abrasive blast cleaning and dried using a hot compressed air lance. Backer rods shall be installed in expansion joint openings at a minimum of one (1) inch depth as indicated on the installation details. Backer rod dimensions shall be as required by the manufacturer. Immediately after cleaning and installing backer rod, coat the bottom of the block-out area with a layer of hot binder that has been heated in accordance with the manufacturer’ s instructions. If there is a greater than one hour delay between cleaning and placement of the binder material, the joint shall be re-cleaned using a hot compressed air lance. Steel backing plates shall extend from face of curb to face of curb on the bridge deck portion of the expansion joint. There shall be at least 2 inches between the edge of the backing plate and the wall of the joint block-out. Backing plates shall be steel and dimensions shall be as required by the manufacturer. Locating pins shall only be used when required by the manufacturer of the joint 424.02 603system. When required by the manufacturer, locating pins shall be spaced in accordance with the manufacturer’ s instructions. The walls of the joint block-out and the backing plates shall be coated with binder immediately after the steel backing plates are placed, making sure that that the plates are entirely encapsulated by the binder. Aggregate shall be heated in a rotating drum mixer to a temperature between 375 degrees F and the maximum safe binder temperature as specified by the manufacturer. After the aggregate is heated, binder shall be added to the mixer to pre-coat the aggregate. Coated aggregate shall be placed and compacted in the block-out in layers as recommended by the manufacturer. The block-out shall be overfilled with coated aggregate as required to compensate for compaction. Compaction shall begin immediately after placement of the material in the block-out and the joint surface shall be made approximately flush with the existing asphalt surface. The material shall be compacted longitudinally and transversely to the joint using a roller or plate compactor, which delivers a minimum centrifugal force of 3400 pounds. After compaction, lines of 3 inches tape shall be placed one inch beyond the joint width on each side of the joint to insure evenness of appearance. The joint and at least one inch of the road surface shall be top-coated with the hot binder until the surface is smooth and absent of voids. Immediately after top-coating, an anti-skid material shall be spread evenly over the joint to eliminate material tracking. Vehicular traffic must not pass over finished joints until at least two hours after completion of compaction or longer when recommended by the manufacturer. When specified on the plans or directed by the Engineer, an adhesive based joint sealer shall be installed in conjunction with the asphalt plug joint. The details for the installation shall be as shown on the plans. The adhesive based joint sealer shall conform to Section 420. When specified, the adhesive based joint sealer will be measured for separate payment in accordance with Section 420.
424.04 Measurement and Payment
Furnish Asphalt Plug Joint will be measured in cubic feet of material recommended by the joint system manufacturer and approved by the Engineer, and will be paid for at the contract unit price per cubic foot. This price shall include furnishing and delivering the asphalt binder material and aggregate to the project site. Place Asphalt Plug Joint will be measured in linear feet along the centerline of the joint for a nominal width of 20 inches, and will be paid for at the contract unit price per linear foot. This price shall include removing and disposing of existing overlay or pavement material and existing joints and membranes; repairing small areas of concrete deterioration in the block-out area; preparing contact surfaces; placing asphalt binder material and aggregate; furnishing and placing backer rod, anti-skid material, steel backing plates, sealing joints in curbs or parapets; working drawings; and services of the manufacturer’ s representative.424.04 604Payment will be made under: ————————————————————————— Pay Item Pay Unit————————————————————————— Furnish Asphalt Plug Joint Cubic Foot Place Asphalt Plug Joint Linear Foot————————————————————————— SECTION 425—RIGID CONCRETE BRIDGE DECK OVERLAYS
425.01 Description
This work shall consist of preparing bridge deck surfaces, and furnishing and placing rigid concrete overlays on concrete bridge decks. The Department will specify the overlay material to be used and the overlay depth on the Plans or elsewhere in the Contract.
425.02 Materials
Silica fume concrete, latex-modified concrete, high early strength latex modified concrete, and very- early-strength latex-modified concrete shall conform to Section 217, except that the coarse aggregate shall be size No. 7, No. 8, or No. 78 for depths and steel clearances less than or equal to 2 inches, and size No. 57, No. 7, No. 8, or No. 78 for depths greater than 2 inches. The use of fly ash or slag will be permitted in silica fume concrete. Class A4 Bridge Deck Concrete used in deep overlays shall conform to Section 217 for Class A4 Concrete, Modified to Minimize Cracking with Shrinkage Reducing Admixture.
425.03 Procedures
a.Deck Surface Preparation: Preparation of a reinforced concrete deck will require one or more of the following operations: removal of asphalt concrete overlay, Type A milling, and/or Type A or B hydro-demolition, as follow.
1.Removing Asphalt Concrete Overlay: The Contractor shall remove the asphalt wearing surface (where applicable) from bridge decks and approach slabs in a manner such that underlying sound concrete will not be damaged and can be prepared to receive necessary treatment. The Contractor shall dispose of the removed asphalt material in a manner approved by the Engineer. Sound concrete damaged as a result of the Contractor’ s operations shall be repaired in accor - dance with Section 412 at the Contractor’ s expense. The Contractor shall not allow fuel oils or other materials that will prevent bonding of the overlay to remaining sound concrete to come into contact with the prepared surface.
2.Type A milling shall consist of milling the surface of the bridge deck and concrete approaches to the depth specified. Equipment shall be capable of removing hydraulic cement concrete material to the require depth resulting in a reasonably uniform surface without damaging adjacent areas or the remaining material. Milling equipment shall be capable of removing at least 1/2 inch of existing material per 424.04
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 629–631 of 1,065.