- 645 - SECTION 728 -- RIPRAP FILTER FABRIC
728.01 Description
1.This work shall consist of furn ishing and installing a riprap filter fabric at the locations shown in the c ontract and as directed by the Engineer.
728.02 Material Requirements
1.The filter fabric to be used sh all be on the Department’s Approved Products List.
2.Filter fabric materials that ar e not on the Department’s Approved Products List may be considered for use provided a manufacturer's certificate of compliance for the pro posed materials is provided to the Engineer. Material criteria are listed on the Department’s Approved Products List.
728.03 Construction Methods
1.The surface underlying the geotextile shall be prepared to a relatively smooth condition free of obstructions, depressions, and debris. Erosion features (i.e., rills, guillies, et c.) shall be graded out of the surface before geotextile placement.
2.The geotextile shall be placed on the underlying surface such that the geotextile is not damaged. The f abric shall be placed so that the upstream strip of fabric will overlap th e downstream strip. Material overlap for unstitched seams shall be a minimum of 40 inches (1 m). The geotextile shall be laid smooth so as to minimize tension, stress, folds, wrinkles, and creases.
3.The geotextile shall be held in place by adequate pinning, selectively placed riprap, or a combi nation of pinning and riprap prior to placement of the specified riprap.
4.The geotextile shall be covered with the specified riprap within 5 days after placement of the geotexti le. Placement of specified riprap onto the geotextile shall not rupture the geotextile.
728.04 Method of Measurement
1.The item, "Riprap Filter Fabric ", shall be measured by the square yard (square meter) of the area covered by the fabric and accepted by the Engineer with no allowance for overlaps.
728.05 Basis of Payment
1.P a y I t e m P a y U n i t Riprap Filter Fabric Square Yard (SY) [Square Meter (m2)]
2.Payment is full compensation for all work described in this Section. - 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.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 679–679 of 1,048.