1510 - STRIP SEAL ASSEMBLY 1500 - 16
1510.1 Description
This specification covers materials for a bridge expansion joint system using a strip seal assembly as shown in the Contract Documents.
1510.2 Requirements
a. Type I.
1.Provide a Type I Strip Seal assembly that consists of a single continuous neoprene strip or diaphragm seal element inserted into two wedge grips of extruded or rolled steel that are anchored to the bridge. The Engineer will consider other configurations of locking devices or grips to retain th e diaphragm in place if the Contractor provides detailed information on the alternate device.
2.Unless shown otherwise in the Contract Documents, provide grips that comply with the requirements of ASTM A 36 or A 242. The anchoring system for the grip s must comply with the details shown in the Contract Documents.
3.Provide a Polych loroprene (Neoprene) diaphr agm that complies with the requirements of ASTM D 2628 (except for recovery requirements), or alternately, ASTM D 2000 3BC 615 A14 B14 C12 F17 (250% minimum ultimate elongation). In the preceding “line call-out”, the “15” in 615 refers to minimum tensile strength in hundreds of psi.
4.Provide a sealant for bonding the neoprene diaphragm to the steel grips that complies with the recommendations of the manufacturer of the assembly. b. Type II
1.Provide a Type II assembly that consists of separa te units of elastomer and metal or integrally molded components cast under heat and pressure, and anchored to the bridge by bolts or studs.
2.The assembly must contain a flexible convolution or diaphragm, with or without fabric reinforcement, which links the pads and spans the expansion joint. The diaphragm must be a continuous strip, molded in an upstanding arch, which will retain its shape during the e xpansion cycle and must permit horizontal, vertical, and skewed movements while still maintaining a watertight seal.
3.Provide an elastomer manufactured from neoprene that complies with TABLE 1510-1. TABLE 1510-1: TYPE II ELASTOMER Property ASTM Test Method Requirement Tensile Strength D 412 1500 psi, minimum Elongation at Break D 412 200% minimum Hardness D 2240 4510 points, Durometer A Compression Set, 22 hrs @ 70C D 395, Method B 35% maximum Low Temperature D 746 or D 2137 Not Brittle @ -40C Ozone Resistance, exposure @ 100 PPHM ozone for 70 hrs. @ 40C, sample under 20% strain D 1149 No Cracks Oil Deterioration, volume increase after immersion in IRM 903 Oil for 70 hrs. @ 100C D 471 120% maximum PPHM = Parts Per Hundred Million
4.Provide a sealant that comp lies with the recommendations of the manufacturer of the assembly.
5.Fasten the assembly to the bridge with bolts or studs that complies with details in the Contract Documents and are of a length recommended by the assembly manufacturer.
6.Provide internal reinforcement plates that comply with the requirements of ASTM A 1011 SS Grade 36, A 36 or similar structural steel. 1510 - STRIP SEAL ASSEMBLY 1500 - 17 c. Type III
1.Provide a Type III assembly that consists of a continuous cellular or strip type neoprene seal, geometrically designed to fasten to or be clamped by the extruded aluminum frames anchored to the bridge by bolts or cast-in-place anchors.
2.Provide aluminum frame components that comply with the requirements of ASTM B 221 (Alloy 6061- T6).
3.Fasten the assembly to the bridge with bolts or studs that complies with details in the Contract Documents and are of a length recommended by the assembly manufacturer.
4.Provide an elastomer manufactured from preformed neoprene that complies with TABLE 1510-2. TABLE 1510-2: TYPE III ELASTOMER Property ASTM Test Method Requirement * Tensile Strength D 412 2000 psi, minimum Elongation at Break D 412 175% minimum Hardness D 2240 7010 points, Durometer A Compression Set, 22 hrs @ 70C D 395, Method B 25% maximum Low Temperature D 746 Not Brittle @ -40C Ozone Resistance, exposure @ 300 PPHM ozone for 70 hrs. @ 40C, sample under 20% strain D 1149 No Cracks Oil Deterioration, volume increase after immersion in IRM 903 Oil for 70 hrs. @ 100C D 471 80% maximum * All test sections taken for the extruded section. PPHM = Parts Per Hundred Million
1510.3 Test Methods
Test the materials in accordance with the ASTM standards referenced above.
1510.4 Prequalification
None required.
1510.5 Basis of Acceptance
Receipt and approval of a Type D Certification as specified in DIVISION 2600. Visual inspection for condition at the point of usage.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 743–744 of 978. View official source ↗