DelDOT Section 504: PCC Crack and Joint Sealing

504.1Description.

This work consists of sealing existing transverse joints, longitudinal joints, and pavement cracks in existing pavement, existing patches, or around new patch perimeters.

504.2Materials.

A.Crack Sealant Section 1042.1.A

B.Joint Sealant Section 1042.1.B

504.3Construction.

504.3.1 Sealant Equipment. Use sealing equipment specifically recommended by the sealant manufacturer. 504.3.2 Existing Sealant Removal.

A.Remove sealant from existing joints using a vertical cutting-edge tool or a power-driven high-

pressure water blaster. The Department will not allow use of V-shaped plow tools to remove existing sealant.

B.Remove the existing sealant to the depth required to accommodate hot pour sealant in

accordance with the Standard Construction Details. 504.3.3 Refacing of Joints. Saw or reface existing joints using a power-driven concrete saw with diamond or abrasive blades to remove all old sealant from the joint faces, to expose new clean PCC, or to cut the joint to the width and depth necessary to provide the joint reservoirs shown in the contract. 504.3.4 Cleaning Before Resealing.

A.Following sawing, re-sawing, or refacing operations on newly constructed or existing joints, clean

the joint faces and openings by sandblasting, followed by compressed air that is dry and oil free. Use compressed air equipment that delivers a continuous pressure of at least 100 pounds per square inch, measured at the source, to remove cuttings or debris remaining on the joint faces or in the joint openings.

B.Ensure that the PCC joint surface receiving the new joint sealant is free of:

1.Tar and asphalt;

2.old sealant;

3.discoloration and stain; and

4.other contamination of the concrete structure that would not result in a clean, dry, newly

exposed concrete surface.

C.When the bottom of the joint opening the contractor plans to seal is formed by previously

installed expansion joint material, such as at existing concrete patch locations, insert a nonreactive adhesive-backed tape instead of the backer rod. Place tape 1/8-inch wider than the nominal joint width.

D.Equip air compressors with traps capable of removing moisture and oil from the compressed air.

Stop work when there is oil or moisture in the compressed air. Make necessary adjustments to the equipment until the air stream is free of contaminants before resuming work.

E.The Department will not allow placement of sealant if dust, moisture, oil, or other contaminants

are present on the concrete surface.

F.Protect the public from hazard or damage during the sandblasting and joint cleaning operations by

shielding the work with rigidly supported plywood sheeting or other suitable material and methods subject to the engineer’s approval.

G.Take care not to damage the subbase, curbs, shoulders, load transfer devices, or pavement. If

damage occurs, submit repair procedure for approval and perform repairs to the satisfaction of the engineer. 504.3.5 Limits of Joint Preparation. Limit the final stages of joint preparation, including air pressure cleaning of joints, and placement of separating or backup material, to the length of joint that will be resealed during a day's production. 504.3.6 Installation of Hot-Poured Sealant.

A.Follow the manufacturer's recommendations for heating and applying the sealant. Provide a copy

of the manufacturer's recommendations to the engineer.

B.Discard and dispose of the first gallon of material to flow out of the applicator wand at the

beginning of the day.

C.Place sealant at a uniform, specified depth and thickness. Seal the joints uniformly so that upon

completion of the work, the surface of the sealant material is 1/16 to 3/16-inch below the adjacent pavement surface. Remove excess material on the surface of the pavement. Do not allow traffic on the pavement in the area of the joints during the curing period.

D.Submit repair procedure for failed joints to the engineer for approval.

504.4Method of Measurement.

A.The Department will measure the linear footage along the crack or joint from end to end.

B.The Department will not measure sealed overcuts and will consider these areas as incidental to

the saw cutting item.

504.5Basis of Payment.

A.The Department will pay for the accepted quantity of crack and joint sealing at the contract unit

price per linear foot. Payment constitutes full compensation for:

1.Providing and placing hot-poured joint sealer;

2.removal and disposal of existing joint sealer;

3.joint re-sawing and refacing;

4.sandblast cleaning; and

5.air-blast cleaning.

ITEM DESCRIPTION UNIT 504001 PCC CRACK AND JOINT SEALING LESS THAN 3/4-INCH WIDE LF 504002 PCC CRACK AND JOINT SEALING, 3/4-INCH TO 1 3/4-INCH WIDE LF

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 167–0 of 786. View official source ↗

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503 PATCHING PORTLAND CEMENT CONCRETE PAVEMENT

505 PCC PATCHING, PARTIAL DEPTH

504PCC CRACK AND JOINT SEALING

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