523 JOINT SEALING OF PORTLAND CEMENT CONCRETE PAVEMENTS
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- Clean and seal Portland cement concrete pavement joints.
- 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.
- 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:
- (a) High pressure water blasting.
- (b) Abrasive blasting.
- (c) Oil free air blowing at a minimum of 90 psi.
- Ensure that all joint walls and surfaces to which the joint material is to adhere are dry prior to installing the joint filler.
- Ensure that all prepared joints are inspected and approved prior to sealing.
- 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.