- 646 - SECTION 729 -- DECK JOINT SEALS
729.01 Description
1.The item, "Deck Joint Seals", shall consist of furnishing and installing fabricated modular expansion joint systems of the general size and configuration shown in the contract. The seals shall be capable of the movement specified and shall be built to the lines and elevations shown in the contract.
2.Manufacturers producing acc eptable items are shown in the contract.
729.02 Material Requirements
1.Structural Steel:
a.Structural steel for extrusions and support bars shall conform to the minimum requirements of ASTM A 709/A 709M, Grade 50 steel.
b.All exposed surfaces of t he extrusions and support bars shall be painted with primer in accordance with Subsection 709.03; the finish coat is not required.
c.As an alternate, steel extrusions and support bars may be galvanized in accordance with ASTM A 123.
2.Stainless steel sheets for the slid ing surfaces of support bars shall conform to the requirements of AST M A 240/A 240M, Type 304, polished to a No. 8 mirror finish as established by the American Iron and Steel Institute Committee of Stainless Steel Producers “F inishes for Stainless Steel” at the completion of fabrication.
3.The elastomeric sealing element shall be a polychloroprene (neoprene) locking box seal that me ets the requirements of ASTM D 2628, modified to omit the recovery test as noted below: Hardness (Shore A Durometer) 60 ± 5 ASTM D 2240 (modified) 4. The seal shall be one piece full length over the entire expansion joint, including curb or parapet units.
5.Support bar bearings shall inco rporate a polytetrafluorethylene surface and a stainless steel surface to minimize resistance to joint movements.
6.Suitable equilibrium type springs, which work counter to compression forces of the sealing elements, shall be used to maintain equalized expansion properties for each element across the joint.
7.Slider plates shall be provided at the curbs as part of the completed joint assembly in accordance with the details shown in the contract.
8.The manufacturer of the expansion joint assembly shall supply shop drawings showing details of the assembly and installation.
729.03 Construction Methods
1.The Contractor shall provide and assemble the expansion joints in accordance with approved shop drawings, joint setting data, contract, and the specifications.
2.The assembly shall be properly secured for shipping and shall contain provisions for final field adjus tment at the time of installation. Deck Joint Seals 729.05 - 647 - 3. All movements due to factors such as shrinkage, creep, and mid- span deflection shall be properly accounted for before the final adjustment.
4.The prefabricated joint assembly shall be properly positioned and attached to the superstructure using an chorages provided with the assembly as shown in the contract.
729.04 Method of Measurement
1.The expansion joint system shall be measured for payment by the linear foot (meter) of joint properly in stalled and accepted by the Engineer.
2.Pay limits for expansion joints shall be the horizontal distance from end to end along the centerline of the jo int assembly at the locations shown in the contract and 12 inches (300 mm) upward at the gutter lines.
729.05 Basis of Payment
1.P a y I t e m P a y U n i t Deck Joint Seal, Type ______ Linear Foot (LF) [Meter (m)]
2.Payment is full compensation for all work described in this Section. - 648 - SECTION 730 -- STRIP SEALS
730.01 Description
1.The item, "Strip Seals", sha ll consist of furnishing and installing prefabricated steel extrusions supp orting neoprene seal inserts, including integral curb units where specified, at the locations and limits shown in the contract. The seals shall be standard prefabricated products corresponding to the types and sizes shown in the contract.
2.Manufacturers producing such items are shown in the contract.
730.02 Material Requirements
1.Expansion and contraction move ments shall be entirely taken by the neoprene.
2.Strip seals shall be complete with curb units, where specified in the contract, and shall be integral with the deck units or otherwise so designed and installed to thoroughly seal the joint against leakage.
3.Structural Steel:
a.Structural steel for extrus ions shall conform to the minimum requirements of ASTM A 709/A 709M, Grade 36, Grade 50, or Grade 50W steel.
b.All exposed surfaces of the extrusions (except weathering grade steel surfaces) shall be painted with a primer in accordance with Section 709. The finish coat is not required.
c.As an alternate, steel ex trusions may be galvanized in accordance with ASTM A 123.
4.The steel extrusions shall be made of one continuous piece unless approved by the engineer. If the steel extrusions are made of more than one piece, they shall be welded at the joints or otherwise adequately bonded together so as to obtain a tight seal.
5.The neoprene seal shall be m ade of one continuous length, and no splicing shall be allowed except where specifically called for in the contract.
6.The neoprene seal shall be m anufactured from polychloroprene, meeting the physical property requirements in Table 730.01.
730.03 Construction Methods
1.The Contractor shall provide setting or installation plans for the Engineer's approval. The Contractor shall install the strip seals in accordance with the manufacturer's instructions and recommendations.
2.The Contractor shall install strip seals on a properly prepared surface.
3.The Contractor shall protect the installed seals against damage from equipment by placing wood planks al ong the seals or by other suitable methods.
730.04 Method of Measurement
1.The expansion joint system shall be measured for payment by the linear foot (meter) of joint properly in stalled and accepted by the Engineer.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 680–681 of 1,048.