164523 — Joint Sealing of Portland Cement Concrete Pavements

523.01 Description

Clean and seal Portland cement concrete pavement joints.

523.02 Materials

Joint Sealers 911.01 Preformed Joint Fillers 911.02 Backer Rod. Use backer rod that is flexible, compressible, nonshrinkable, has a surface that will not bond with the joint sealer, and is capable of uniformly containing the sealer within the desired shape factor. Do not use hard rubber or materials that swell when wet or deform at sealer application temperatures.

523.03 Construction

Seal joints the same day they are shaped and prepared and complete the joints prior to opening the roadway to traffic, unless otherwise directed. If joints are not sealed the same working day, reclean and dry the joints as specified in 523.03.02 prior to sealing.

523.03.01 Joint Construction. As specified in 520.03.14. If the joint is tooled, do not use

preformed joint fillers. 523.03.02 Joint Preparation. Clean joints by one of the following methods as approved:

523.03.03 Sealing. Install preformed joint filler in conformance with the manufacturer’s

recommendations and the Contract Documents. Insert the backer rod as specified. Install silicone sealer in conformance with the manufacturer's recommendations. Backer rods are not required in longitudinal joints. Apply sealer when the ambient air and pavement temperatures are at least 45 F and rising. Heat hot applied sealer in accordance with the manufacturer’s recommendations in a kettle or other equipment acceptable to the Engineer. Use kettles that have mechanically operated agitators, recirculation pumps, and positive thermostatic temperature controls. The applicator wand and all connecting hoses shall be insulated. Do not overheat or apply direct heat to the sealer. Withdraw and waste all filler that has been overheated, heated more than four hours, or that remains in the applicator at the end of the day’s operation. Prior to the start of each day’s operation, withdraw and waste at least 1 gallon of filler through the applicator wand. Fill joints with sufficient material that the final surface of the sealer is recessed 1/4 in. below the pavement surface. Reseal the joint if within two hours after sealing, the sealer is recessed more than 5/16 in. below the pavement surface. Use an approved tool to apply a parabolic shape to the surface of the sealer. Ensure that the deepest point at the center of the joint is 5/16 in. below the pavement surface. Remove any excess sealer from the surface of the pavement. Curing time for silicone material varies with temperature and humidity and may delay opening the pavement to traffic. Traffic is not allowed on the pavement surface until the sealer has cured. Refer to the manufacturer’s recommendations for curing time. Any sealer that pulls loose from the joint or shows excessive bubbling within one week after opening the pavement to traffic shall be replaced.

523.04 Measurement and Payment

Joint Sealing of Portland Cement Concrete Pavement will be measured and paid for at the Contract unit price per linear foot of joint unless otherwise specified. The payment will be full compensation for cleaning existing joints, furnishing, hauling, placing all materials including preformed joint filler, joint sealer, backer rod, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. Joint construction and sealing will not be measured but the cost will be incidental to the Contract unit price for the pertinent Portland Cement Concrete Pavement item. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 524 — DOWEL BAR RETROFIT CATEGORY 500 PAVING SECTION 524 — DOWEL BAR RETROFIT

524.01 Description

Place load transfer devices or dowel bars between two slabs in an existing Portland Cement Concrete (PCC) Pavement. Place dowel bars into slots cut across cracks or joints and backfilling with grout.

524.02 Materials

524.02.01 Plain Reinforcement. Dowel bars used as ties in PCC pavement expansion and contraction joints shall be plain round steel bars conforming to A615, Grade 60 or A36 unless otherwise specified. Bars shall be epoxy coated using epoxy powder conforming to 917.02. Each dowel bar shall be coated with a water insoluble lubricant as approved.

524.02.02 Expansion Caps. Use tight-fitting, commercial quality end caps made of a non-

metallic, non-organic material that allows for 1/4 in. of movement at each end of the dowel bar. 524.02.03 Dowel Bar Support Chairs. Chairs for supporting the dowel bars shall be either completely epoxy-coated steel conforming to A 884 or fabricated of commercial quality nonmetallic, non-organic material. The dowel bar chairs shall firmly hold the dowels centered in the slots during the fast setting grout backfill operations. Dowel chairs shall be designed to hold the bar a minimum of 1/2 in. above the bottom of the slot while the fast setting grout backfill is placed and consolidated.

524.02.04 Foam Core Insert . Use 3/8 in. thick foam core inserts to re-establish the joint or crack

and allow each side of the slot to expand and contract. The inserts shall consist of rigid Styrofoam material or closed cell foam, faced with poster board or plastic material. The width of the foam board in its final position shall be 1/16 in. wider than the slot to minimize movement of the foam board and prevent incompressible material from entering the contraction joint during concrete placement. The width of the foam core board may need to be increased for pavements with skewed cracks or joints.

524.02.05 Grout Material. Refer to 902.14. Use Class II or Class III Rapid Hardening

Cementitious Material to backfill the dowel bars. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS