New Hampshire Department of Transportation Standard Specifications – 2016 Description
1.1This work shall consist of all work required to furnish and install silicone joint sealant as shown on the plans. The joint
sealant shall consist of a cured-in-place silicone rubber material forming a flexible watertight seal. Materials
2.1Silicone joint sealant shall meet the requirements of ASTM D 5893 and shall be a product listed on the Qualified Products
List. Silicone joint sealant for horizontal joints shall be either Type NS (Non-Sag) or Type SL (Self-Leveling). Silicone joint sealant for vertical joints shall be Type NS (Non-Sag).
2.2Backer rod, when required, shall be expanded closed cell polyethylene, meeting the requ irements of ASTM 5249.
2.3Primer shall be a product recommended by the silicone joint sealer manufacturer.
Construction Requirements
3.1General. The treatment of the steel, concrete, and stone surfaces and the preparation and installation of material sh all be as
recommended by the manufacturer. 3.1.1 Concrete shall have cured a minimum of 14 days prior to application of the primer and/or sealant. 3.1.2 The joint area shall be abrasive blast cleaned to achieve an anchor profile that is clean, and free of laitance, oil and foreign materials. Steel substrates shall receive an SSPC SP10 near -white metal blast cleaning or other treatment as directed by the Engineer prior to application of the primer. After blasting, all abrasives, dust and dirt shall be blo wn out of and away from the joint using a high-pressure air blast. All equipment used for preparing and cleaning the joint shall be equipped with traps capable of providing moisture-free and oil-free air. All surfaces shall be dry and frost- free. 3.1.3 Primer shall be applied to all substrates to be sealed unless otherwise directed by the Engineer. The prime coat shall be applied in a thin, uniform layer over the entire contact surface area in accordance with the sealant manufacturer’s recommendations. 3.1.3.1 The primer shall cure in accordance with the manufacturer’s recommendations before application of the sealant. In all cases, the prime coat shall be allowed to dry for a minimum period of 60 minutes prior to the application of the sealant. The priming operation shall not be performed more than 3 hours ahead of the sealing operation at any given time. 3.1.4 The backer rod, when required, shall be installed at the appropriate distance below the finish grade surface. The width of the backer rod shall be approximately 25% wider than the joint opening. 3.1.5 Silicone sealant installation method and application tools shall be as recommended by the manufacturer. Non -sag sealants shall be tooled in place in accordance with the manufacturer’s recommendations. 3.1.5.1 The silicone bead shall be no thicker than 1/2” and no thinner than 1/4” The top of the silicone bead shall be recessed 3/8” below finish grade except below paved surfaces, where sealant shall be at top of concrete. For non -joint applications on the plans where sealant is specified to fill a void, the sealant shall be pressed into place to completely seal the void and tooled to shed moisture. Method of Measurement
4.1Silicone joint sealant will not be measured, but shall be the linear fo ot final pay quantities in accordance with 109.11 for
silicone joint sealant required as shown on the plans. Material removed because of faulty workmanship will not be measured. Basis of Payment
5.1Silicone joint sealant is a final pay quantity item and will be paid for at the Contract unit price per linear foot complete in
place in accordance with 109.11. No additional payment will be made for the primer or backer material. Pay item and unit:
562.1Silicone Joint Sealant (F) Linear Foot
New Hampshire Department of Transportation Standard Specifications – 2016
Description
This work shall consist of furnishing and erecting bridge rail for bridges and retaining walls in conformity with details shown
on the plans or ordered. This work shall include anchor rods or insert sleeves to support the railing and all construction a bove the top of the curb or sidewalk.
1.2Designations. Bridge rails are classified as follows:
Type Bridge Railing
Steel Tube Railing, 2 Rail ST Steel Tube Railing, 2 Rail (PL2) T2 Steel Tube Railing, 3 Rail (PL2) T3 Steel Tube Railing, 4 Rail (PL2) T4 W-Beam with Steel Tubing T101 Aluminum Railing (2 Bar) F2 Aluminum Railing (3 Bar) F3
1.3This work shall consist of furnishing and erecting protective screening or snow fence in conformity with details shown on
the plans or ordered. Aluminum and steel components for screening may not be interchanged, and shall conform to the material requirements as detailed on the plans or as stated herein. Materials
Structural steel shall conform to the requirements of ASTM A572 Grade 50, unless otherwise specified on the plans, except
anchor plates may be ASTM A36. 2.1.1 Galvanized W-Beam sections shall comply with 606.2.4.
Steel pipe shall conform to ASTM A 53, Grade B, seamless unless specified otherwise on the plans.
Steel rail tubing shall conform to ASTM A 500, Grade B, unless otherwise specified on the plans. The tubing shall meet the
Charpy V-notch toughness requirement of 15 ft-lbs at 0 °F. CVN test samples shall be taken after forming the tubes. 2.3.1 For steel tubing rail-to-post fasteners shall be ASTM A 325 round-head bolts or ASTM A 276 Type 304 stainless steel threaded studs. All other fasteners may be ASTM A 307 bolts with ASTM A 563 nuts or cap screws. Anchor rods shall be ASTM A 449 with ASTM A 563 nuts.
2.4Galvanizing shall conform to AASHTO M 111 (ASTM A 123) for structural steel posts and tubing, AASHTO M 232 (ASTM
A 153) for bolts, nuts, and washers, and conform to ASTM A 385 to provide adequate precautions (e.g. vent holes) for a quality product. The galvanizing kettle shall have 0.05 to 0.09 percent nickel. If the galvanizing is to be painted or powder coated, follow the requirements of Section 708, Appendix A or B.
2.5The material requirements of Section 606 shall apply for W -beam guardrail, thrie-beam guardrail, and tubular thrie -beam
guardrail.
2.6Aluminum railing and aluminum and steel appurtenances shall conform to the pertinent materials specified in the latest
edition of “ A Guide To Standardized Highway Barrier Rail Hardware”, by the AASHTO- AGC-ARTBA Joint Cooperative Committee, ARTBA (formerly Technical Bulletin No. 268-B AGC Standard Form No. 131, June 1979) as amended. 2.6.1 Stainless steel studs shall meet the requirements of ASTM A 276, Type 304 modified or Type 430 modi fied, each to 100,000 psi tensile strength with 15 percent elongation.
2.7Preformed bearing pads shall be manufactured as a single sheet approximately 1/8” thick, in the required dimensions shown
on the plans. Bearing pads shall be accepted based upon receipt of a Certificate of Compliance stating that the products comply with the requirements of 2.7 (a) or (b), as applicable, including test results performed by an independent testing laboratory.
of 50 Shore A-durometer (minimum) material, adequate for 1,000 psi design compression stress, and meeting Level I test requirements with no cracks after the compressive load test, or
or synthetic fibers and vulcanized with a proportion of fiber content sufficient to maintain strength and stability. Rubber shall be polyisopren e (natural rubber) or polychloroprene (neoprene). The surface hardness shall be minimum 80 ± 5
SILICONE JOINT SEALANT in other states
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