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Electrical (16000-16999)

503001 PATCHING PCC PAVEMENT, 6’ TO 15’, TYPE A SY

DE · 2025 Standard SpecificationsBook pages 167–171View official source ↗

PATCHING PORTLAND CEMENT CONCRETE PAVEMENT SECTION 503 157 b. providing and placing dowel bars;

c.anchoring grout;

d.grouting retainer disks; and

e.providing and placing temporary dowel supports to maintain alignment.

G.Crack and Joint Sealing Less Than 3/4 -Inch Wide.

1.The Department will pay for this item separately in accordance with Section 504.

503.5.1 Price Adjustment for Low Strength Concrete. The Department will calculate the prorated payment for concrete, as referenced in Section 503.3.7, as shown in the following equation:

ITEM DESCRIPTION UNIT 503001 PATCHING PCC PAVEMENT, 6’ TO 15’, TYPE A SY 503002 PATCHING PCC PAVEMENT, 15’ TO 100’, TYPE B SY 503004 PATCHING PCC PAVEMENT (UNDERCUTTING) SY-IN 503006 DOWEL BARS EA

PCC CRACK AND JOINT SEALING SECTION 504 158 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. PCC CRACK AND JOINT SEALING SECTION 504 159 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 wor k.

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.

PCC CRACK AND JOINT SEALING SECTION 504 160 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

PCC PATCHING, PARTIAL DEPTH SECTION 505 161 SECTION 505 — PCC PATCHING , PARTIAL DEPTH

505.1Description.

This work consists of partial depth patching of PCC.

505.2Materials.

A.PCC Patching Material, Partial Depth Sections 1022 and 1023

B.Joint Sealants Section 1042 .1.2.B

C.Wax -Based Bond Breaker with a Flash Point not less than 200 degrees F

505.3Construction.

Provide a flatwork technician with an ACI or NRMCA certification, or a certification from another program pre -approved by the Department, to supervise all concrete finishing work. Provide the flatwork certification to the engineer before placing concrete. 505.3.1 Preparation and Placement.

A.Saw cut to depth in accordance with the Standard Construction Details around the perimeter of

the patch area to provide a vertical face at the edge. Break and remove concrete within the patch area to a depth required until sound and clean concrete is ex posed. Avoid fracturing the sound concrete below the patch and undercutting or spalling the patch boundaries during the concrete removal operation.

B.If a partial depth repair area abuts a working joint or crack that penetrates the full depth of the

slab, place an insert, styrofoam, wax-based bond breaker or other approved bond -breaking medium to maintain existing joint dimensions.

C.Air-blast clean the patch surface of the prepared concrete just before placement of the patch

material. 505.3.2 Joints.

A.Ensure that joints in the existing concrete pavement remain transversely and longitudinally

unobstructed.

B.Install joints in accordance with the Standard Construction Details.

C.Clean and seal all joints with hot -poured sealant material after the specified strength has been

achieved, if no overlay is planned in accordance with Section 504. 505.3.3 Concrete Strength Requirements.

A.In addition to the requirements in Section 503.3.7 and ASTM C -109, mix , place , and cure the patch

material in accordance with the manufacturer’s recommendations. The contractor may open the patch area to traffic once the patch material reaches a compressive strength equal to or greater than 2,000 -psi. Use only rapid cured concrete that will reach a compressive strength of 2,000 -psi in 6-hours or less.

B.If unfavorable ambient temperature is predicted that would prevent achieving the desired

strength in the desired timeframe, then reschedule the work, subject to the approval of the engineer.

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 167–171 of 779.

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50100 1 PCC PAVEMENT, 8” SY

50400 1 PCC CRACK AND JOINT SEALING LESS THAN 3/4 -INCH WIDE LF