416.02 Dowel Bar Retrofit
415.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: CONCRETE JOINT SEALING Linear Foot [Meter]
416.01 Description
This work consists of restoring load transfer in existing portland cement concrete (PCC) pavement by installing epoxy coated dowel bars across transverse joints or cracks.
416.02 Materials
A.Dowel Bars Provide epoxy -coated dowel bars in accordance with Subsection 723.08, “Epoxy Coated Reinforcement Bars,” of the dimensions shown on the Plans. Provide tight -fitting, nonmetallic end caps that allow the bar to move ¼ in [6 mm] at each end.
B.Foam Core Board Provide foam core board ¼ in [6.25 mm] thick, constructed of closed cell foam, and faced with poster board material on each side.
C.Dowel Bar Chairs Provide nonmetallic dowel bar chairs to keep the dowel bars from moving during concrete placement. Place dowel bar chairs a t the locations shown on the Plans, within the vertical and horizontal tolerances.
D.Portland Cement Concrete Patching Material Provide PCC patching material to backfill retrofit slots in accordance with Section 701.16 . Mix, place, and cure PCC patching material in accordance with the manufacturer’s recommendations. The PCC patching material may be extended by using aggregate in accordance with Subsection 701.05, “Fine Aggregate,” and Subsection 701.06, “Coarse Aggregate, ” excluding the gradation requirements. Provide and use a PCC mix design for the patching material (including additives) that develops a compressive strength of at least 4,000 psi [27.6 MPa] in 6 hr. Provide curing compound in accordance with Subsection 701.07, “Curing Agents.” DOWEL BAR RETROFIT 416.04
416.03 Equipment — Vacant
416.04 Construction Methods
A.Slot Sawing Use a gang saw capable of sawing at least three slots in the pavement at one time. Center the slots over the cracks and transverse joints, and align the slots so that the longitudinal axis of each dowel bar is parallel to the pavement centerline and the surface of the lower of the two panels. En sure the vertical and horizontal alignment does not exceed ¼ in [6.35 mm].
B.Concrete Removal Remove concrete from the slot area with a jackhammer no larger than the 30 lb [13.6 kg] class. If this jackhammer damages the pavement, discontinue its use and replace with a lighter jackhammer. Before installing the dowel, sandblast exposed surfaces and cracks in the slots, and clean slots of saw slurry and loose material. Dispose of loose material in accordance with Subsec tion 104.09, "Removal and Disposal of Salvaged Materials, Structures, and Obstructions. "
C.Foam Core Board Place the foam core board to maintain the continuity of the existing transverse joint or crack. Size the foam core board to fit tightly around the dowel bar and to the bottom and sides of the slots. Caulk existing transverse joints or cracks with approved sealant at the bottom and sides of the slots, as specified, to prevent patch mix from entering the joint or crack. Remove excess caulking to crea te a smooth, level joint or crack surface. Install the foam core board so that it remains in position and tight to all edges during patch material placement. The Contractor may use tabs to hold the foam core board in place and may cut or remove existing joint sealant to accommodate the tabs. If the foam core board shifts during the placement of concrete patching material, remove and replace at no additional cost to the Department.
D.Dowel Bars Cover the dowel bars with a thin coat of form release oil before beginning the placement of concrete patching material over the dowel bars. The Department will not allow oil to contaminate concrete surfaces to be overlaid or the surfaces of the slots. Place the dowel bar assembly (with chairs and foam core board a ttached) across the transverse joint or crack as specified. Ensure that chairs hold the dowel bars in place and provide at least ½ in [12.5 mm] clearance between the bottom of the dowel and the bottom of the slot. Remove and replace dowel bars that shift during the placement of concrete patching material, at no additional cost to the Department.
E.Existing Concrete Surfaces Ensure existing concrete surfaces in the slots are clean and dry, or prepared in accordance with the manufacturer recommendations. Remove excess water from the slots before placing the concrete patching material.
416.06 Dowel Bar Retrofit
F.Concrete Placement Place concrete patching material into the slot, and vibrate to completely encase the dowel bar. The vibrator head’s diameter shall not exceed 1¼ in [37 .5 mm]. Obtain the Resident Engineer’s approval before placing concrete in ambient temperatures below 50 °F [10 °C].
G.Damage Repair damage to the existing pavement caused by Contractor operations, at no additional cost to the Department.
H.Slot Surface Trowel -finish the top surface of the filled slot flush with the existing concrete surface, and allow the surface to cure. If the Contract requires diamond grinding, leave the top surface of the fill slot not more than ¼ in [6.25 mm] higher than the exist ing concrete surface. Do not under fill the slots. Apply curing compound before the final set of the mortar in the concrete patching material. Saw the new joint within 24 hr, or as directed by the Resident Engineer.
I.Testing Concrete Patching Material Test the concrete patching material once for each 4 hr of production, or at least once a day. Ensure the concrete patching material has a compressive strength of at least 4,000 psi [27.6 MPa] in 6 hr. The Contractor may test for compressive strength up t o 24 hr after making the cylinders. If the compressive strengths are not met, cease production, and resubmit a concrete mix design that corrects the problems. Do not open lanes to traffic until the patch material achieves a compressive strength of at lea st 3,000 psi [20.7 MPa].
416.05 Method of Measuremen T — Vacant
416.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: DOWEL BAR RETROFIT Each DIAMOND GRINDING CONCRETE PAVEMENT 425.04 SECTION 425 DIAMOND GRINDING CONCRETE PAVEMENT
425.01 Description
This work consists of grinding portland cement concrete (PCC) pavement to restore drainage and riding characteristics to the pavement surface.
425.02 Materials — Vacant
425.03 Equipment
Provide power -driven, self -propelled grinding equipment designed to smooth and texture PCC pavement with diamond blades. Provide a machine with an effective wheel base of at least 12 ft [3.6 m]. Ensure the front of the machine has a set of pivoting tandem bogey wheels, and the rear wheels travel in the track of the cut pavement. Place the center of the grinding head no more than 3 ft [0.9 m] ahead of the center of the back wheels. Provide equipment that can cut or plane at least 4 ft [1.2 m] wide to avoid a seam in the wheel path of a travel lane. Ensure the machine’s shape and dimension do not encroach on traffic movement outside the work area. Do not use equipment that causes excessive ravels, aggregate fractures, spalls, or cracks, or disturbs transverse and longitu dinal joints.
425.04 Construction Methods
A.Grinding Pavement Grind the surface of pavement areas shown on the Plans. Grind longitudinally, beginning and ending at lines transverse to the pavement centerline. Ensure the ground pavement surfaces of adjac ent sides of transverse joints and cracks are on the same plane. The Department will allow less than 100 percent grinding within specified areas if minor depressions occur in the pavement. Make multiple passes as necessary to achieve acceptable results. Ensure the pavement surface grinding produces a uniform, finished surface. Eliminate joint and crack faults. Maintain a constant cross -slope between the edges of grinding operations to provide positive lateral drainage. Transition the grinding of auxilia ry or ramp lanes from the mainline edge to provide positive drainage and a smooth riding surface. Feather -grind adjacent lanes or paved shoulders to maintain motorist safety and proper drainage for pavement grinding deeper than ¼ in [6 mm].
1.Surface Tex ture and Grooving Grind the pavement surface until it has a uniform appearance, with a texture composed of longitudinal ridges and grooves. Create surface grooves from 0.09 in to 0.15 in [2 mm to 4 mm] wide, spaced up to ⅛ in [3 mm] apart. Ensure the rid ge peaks are at least 1/16 in [1.5 mm] higher than the bottom of the grooves.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 294–296 of 935.