527DOWEL RETROFIT

527.1DESCRIPTION—This work is the installation of epoxy-coated, smooth dowel bars into existing concrete

pavement across cracks or transverse joints without dowels.

527.2MATERIAL—

Use within the shelf life and temperature limitations set by the manufacturer.

If accelerating admixtures are used, provide only accelerating admixtures that contain no chlorides.

point of not less than 149F, and recommended for contact with steel materials according to manufacturer’s recommendations. Do not use graphite-based lubricants.

527.3CONSTRUCTION—As shown on Standard Drawings and as follows:

bar slot. Do not use equipment that may cause pavement to spall or cause surface aggregates to fracture.

slab. If repair area spans different pavement thicknesses, e.g. mainline to ramp transitions, place at the mid- depth of the thinner thickness. Align saw cuts parallel to roadway centerline. Cut three dowel slots (six saw cuts) per wheel path and centered over the crack or transverse joint. Provide three dowel bar slots in each wheel path. Use a jackhammer weighing not more than 30 pounds to remove concrete between saw cuts. If pavement damage occurs from a 30-pound jackhammer, remove the damaged pavement and use a 15- pound jackhammer. Clean and backfill the damaged pavement area as specified in Sections 525.3(c) and 525.3(d). Create a level surface at bottom of slot parallel to roadway surface.

before concrete placement and remove all slurry to prevent debris from emerging once dried. Final cleaning must be completed within 30 minutes before concrete placement. Reclean areas not repaired within 30 minutes of final cleaning or if contamination occurs before concrete placement. When cleaning by air blasting, use a compressed air stream of at least 100 pounds per square inch measured at the source, free of oil, moisture, and other contaminates.

dimensions of the slot at the joint. Cut an opening in the polystyrene joint material to allow the dowel to fit without stretching and without gaps. Place the material centered on the dowel to form a temporary joint. Apply bond-breaker lubricant to Type B coated dowel bars, unless a bond breaker lubricant has been applied in the shop. Stir the lubricant and apply by daubing, mopping, or with a gloved hand, to produce a thorough coating. Do not use brushes for lubricant application. Apply the lubricant, as specified, at least 1 hour before placing the concrete around the dowel assembly. Type A coated dowel bars do not require lubricant as specified in Section 501.3(i). Place 1 1/2-inch non-metallic expansion caps with 1/4-inch clearance from the end of the dowel to the bottom of the cap. For crack or joint widths greater than 1/4 inch, use expansion joint material instead of the preformed cellular polystyrene material with a thickness matching the crack or joint width.

dowel bar cap and all slot surfaces, including end, both sides and bottom. Place chairs on the bottom of the slot. Place coated dowel bars parallel to roadway centerline and pavement surface not to exceed the following limits:

• Vertical tilt or horizontal skew (relative to the plane of the grade and the centerline of the constructed pavement): 0.25-inch maximum displacement of each end of the dowel relative to the midpoint of the dowel.

• Longitudinal translation (relative to the intended crack or transverse joint location, along the direction of travel): 1 inch maximum

• Horizontal translation (relative to the intended location, across the crack or joint): 1 inch

Place dowels to align the temporary j oint material with the existing joint or crack. Seal the temporary joint material at the sides and bottom of transverse joint or crack with caulking compound to prevent concrete patching material from entering into existing joint or crack.

the slot and around dowel bar. Do not allow the dowel bar to move from the specified position.

slots to match the existing pavement surface profile, including any existing wheel ruts.

as required.

cost to the Department.

527.4MEASUREMENT AND PAYMENT—Each

For the existing joint or crack preparation, patching, curing and sealing operations. Includes six dowel bars per joint or crack.