232 ALASKA 2020 SECTION 507
507-1.01 DESCRIPTION. Construct concrete, timber, or steel bridge railing, pedestrian railing
and safety railing as shown on the Plans. Furnish and install bridge number plates as shown on the Plans.
507-2.01 MATERIALS. Use materials that conform to the following:
Steel Railing Section 722 Timber Railing Section 506 Concrete Section 501 Epoxy -Coated Reinforcing Bars Subsection 709- 2.01 Grout Section 701- 2.03 Cable Use ¼ inch galvanized wire rope with a minimum breaking force of 7,000 pounds. Bronze ASTM B98, UNS Alloys C65100 or C65500 or ASTM B584, UNS Alloy C92200 CONSTRUCTION REQUIREMENTS
507-3.01 Constructio N Requirements.
1.General . Construct railing to the line and grade shown on the Plans. Ensure that the rail does not reflect any unevenness of the bridge structure. Set rail posts plumb. Place railing after all falsework is removed and the span is self -supporting. Do not paint bridge railing. Furnish and install concrete curbing, associated reinforcing steel, and the approach rail transition bracket for steel bridge railing.
2.Steel . Erect steel railing in conformance with Section 504, except do not use load indicating washers. Weld in conformance with Section 504. Complete welding before galvanizi ng the railing.
3.Timber . Fabricate and install timber railing according to Section 506.
4.Concrete. Construct concrete barriers to meet applicable requirements of Sections 501 and 503. Use Class A concrete with a specified compressive strength of 4000 psi. Apply a rubbed finish to exposed surfaces of concrete.
507-4.01 METHOD OF M EASUREMENT. See Section 109.
507-5.01 BASIS OF PA YMENT. The contract price includes all rail elements, rail posts, brackets,
spacers, fastenings and anchors required to attach the ra iling to the structure; concrete and associated reinforcing steel included or partially contained within the limits of the concrete rail section or within the limits of the concrete curb for the steel bridge rail section; and bridge number plates. 233 ALASKA 2020 Payment will be made under: PAY ITEM Item Number Item Description Unit 507.0001.____ Steel Bridge Railing,______ LF 507.0002.____ Pedestrian Railing LF 507.0003.____ Thrie Beam Bridge Railing LF 507.0004.____ Concrete Bridge Barrier LF 507.0005.____ Timbe r Bridge Railing LF 507.0006.____ Cable Safety Railing LF 234 ALASKA 2020 SECTION 508 WATERPROOFING MEMBRA NE
508-1.01 DESCRIPTION . Furnish and install waterproofing membrane system on concrete bridge
decks. Remove and dispose of waterproofing membrane systems on exist ing concrete bridge decks.
508-1.02 SUBMITTALS. Submit for approval a copy of the manufacturer’s latest data sheets,
installation procedure, curb and corner details, and manufacturer’s on- site representative’s name and experience. For low voltage electric field vector mapping (EFVM) acceptance methods, submit for approval an acceptance testing plan. Include a list of equipment to be used, a diagram showing installation locations, inspection method, inspector’s name and experience, and a letter from the mem brane manufacturer stating that the system is compatible with EFVM testing. The EFVM inspector must not be employed by the contractor, subcontractor, or installer. Provide one complete submittal not less than 30 days prior to installation of the waterproof ing membrane system.
508-1.03 MANUFACTURE R’S ON -SITE REPRESEN TATIVE. Install waterproofing membrane
system under the on- site supervision of a third- party representative from the manufacturer. The representative must not be employed by the contractor, subc ontractor, or installer. The representative must be on site for the full duration of installation, testing, and during placement of the first lift of pavement overlay material. Do not substitute manufacturer’s representative listed in the submittal without prior written approval from the Engineer.
508-2.01 MATERIALS. Use materials that conform to the following:
Spray -Applied Waterproofing Membrane Subsection 731- 2.01 Sheet Waterproofing Membrane Subsection 731- 2.02 Pavement Overlay Material Division 400 CONSTRUCTION REQUIREMENTS
508-3.01 Constructio N.
1.General . Install the waterproofing membrane system in accordance with the manufacturer’s installation procedure. Do not apply membrane until the end of the curing period and until concrete and grout has reached at least 80 percent of the specified 28- day compressive strength (f’c). Apply the membrane system vertically at curb faces up to the pavement thickness shown on the Plans. Use a tack coat recommended for use by the manufacturer. Protect adjacent surfaces not to be covered with the membrane from splatter or coating. Use pavement overlay material within the membrane manufacturer’s temperature limitations. Hold a pre- placement meeting at least 3 days prior to application of the membrane. Include the Engineer, manufacturer’s on- site representative, membrane installation foreman, and paving foreman.
2.Deck Preparation. Remove existing pavement and membrane systems by methods that do not damage the concrete.Prepare the concrete surfaces that are to recei ve the waterproofing membrane system as required by the manufacturer. Provide a letter prior to membrane placement from the manufacturer’s on- site representative stating that the concrete surfaces to receive membrane meet the manufacturer’s requirements and contract requirements prior to placement of the membrane system.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 260–261 of 584.