SECTION 822 — SILICONE HIGHWAY JOINT SEAL 800-123 — SILICONE HIGHWAY JOINT SEAL
822.01 Description.
This work includes providing silicone joint sealant in highway and bridge expansion and contraction joints at the required locations.
822.02 Materials.
Ensure that the silicone joint sealant is on the Approved Materials List and that the sealant is one part silicone material that readily extrudes over a wide temperature range and cures to produce a durable, flexible, low modulus, silicone rubber seal. Ensure that t he material has a minimum extension recovery of 100 percent and a minimum compression recovery of 50 percent of the original joint width. Use a silicone sealant that conforms to Federal Specifications TT-S- 01543 A Class A (one- part silicone sealants) and TT-S-00230 C Class A (one component sealants).
822.03 Construction Methods.
Clean all joints of contaminants and impurities to the depth at which the sealant (and backer rod if detailed) will be installed. This will provide a sound, clean, and frost -free surface for sealant application. Blow out all dust, loose particles, and other debris with oil-free compressed air. Install an expanded closed cell polyethylene foam rod back -up material in joints or an approved bond breaker tape if detailed on the Plans. Apply to the surfaces of steel expansion joints if recommended by the manufacturer. Use a primer as recommended by the sealant manufacturer. Apply silicone highway joint sealant in a continuous operation to properly fill and seal the joint width. Ensure that the sealant application is not thicker than ½ in. and no thinner than ¼ in. with an approximate width to depth ratio of 2:1 or as recommended by the manufacturer. Apply the sealant at a temperature as recommended by manufacturer. Pump the sealant directly from the original container into the joint by use of an air powered pump, pushing the sealant ahead to form a uniform bead. Ensure that the sealant fills the joint from the bottom to slightly below the pavement surface. Tool the joint using a blunt instrument so that it is slightly concave and approximately ¼-in. below the adjacent surface. Perform the tooling within 10 minutes of application before a “skin” forms. Do not use soap or oil as a tooling aid. Do not allow traffic on the sealed joint for at least 30 minutes after sealant application.
Part 800 — Bridge Structures August 2025
800-124 SECTION 822 — SILICONE HIGHWAY JOINT SEAL Limitations. Silicone sealant is not intended for continuous water immersion, and it should not be applied in totally confined spaces where the sealant is not exposed to atmospheric moisture. Do not apply the sealant to wet or damp surfaces. Do not install the sealant during inclement weather.
822.04 Method of Measurement.
Silicone Highway Joint Sealant will be measured by the number of linear feet of each type of joint installed.
822.05 Basis of Payment.
The Department will pay for the completed and accepted quantities as follows. Pay Item Pay Unit Silicone Highway Joint Sealant LF The price constitutes full compensation for all silicone sealant, backer rods, bond breaker tape, primer, surface preparation, other materials, labor, tools, equipment, and incidentals required to finish the work, complete and accepted.
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