516.1DESCRIPTION —This work is the construction of single course, full depth, normal strength or
accelerated strength, cement concrete pavement patches , and corner repairs. If diamond grinding is to be performed, test the pavement surface in the longitudinal direction as specified in Section 514.3(d)2.
dowels in the transverse faces of the existing pavement, construct a sealant reservoir, and seal the joint.
6 feet and 20 feet long. Do not patch less than one lane width.
20.1 feet and 65 feet long. Do not patch less than one lane width.
65.1 feet and 500 feet long. Do not patch less than one lane width.
516.2MATERIAL—Section 501.2 with the following modifications:
Section 501.2 Material. Add the following:
Use within the shelf life and temperature limitations set by the manufacturer.
516.3CONSTRUCTION —As shown on the Standard Drawings, as specified in Section 501.3 and as
follows:
Plan must describe appropriate action points for all phases of construction, including concrete mixing and curing, joint sawing and sealing, and sampling and testing for opening to traffic. If patching adjacent lanes, construct concrete pavement patches one-lane at a time where two-lane width construction would interfere with traffic. The Representative will surface mark patch areas in advance of the sawing operations. Protect traffic from drop off conditions as specified in Section 901.3(j). Do not allow excavated patch areas to remain un -patched for more than 48 hours or over weekends or holidays. If an excavated patch area is to remain open for longer than 48 hours and is adjacent to open traffic lanes, place suitable material to grade and compact to non-movement or use other approved methods to protect traffic. If it rains while the patch area is open, excavate an outlet through the shoulder at the lowest point of the patch as directed. Repair any damage to the existing shoulders as a result of this work, at no additional cost to the Department. After saw cutting the existing pavement, allow traffic on patch areas of existing pavement for a maximum of 72 hours. Do not allow saw cuts greater than 1/2 inch in width or less than full depth to be opened to traffic. Before placing concrete, ensure adequate equipment and trained personnel are available, and sufficient hauling units scheduled, to maintain continuity in placement.
water cooling system, and cut-depth controls for saw cutting the perimeter of the patch. Do not allow cooling water, slurry, and dust from the sawing operation to enter any la ne opened to traffic. Make all required full depth longitudinal saw cuts along the perimeter of the patch before making any full depth transverse saw cuts. Where only one lane is being patched, make a full depth saw -cut in the existing longitudinal joint for the full length of the patch. Where multiple lanes are being patched one lane at a time, perform one of the following:
• Make a full depth saw -cut within the adjacent lane to be patched. Make the saw -cut parallel and not more than 1 foot from the existing longitudinal joint. Form the patch joint in the same location as the existing longitudinal joint and backfill behind the forms with aggregate at no additional cost to the Department.
• Make a full depth saw -cut in the existing longitudinal joint for the length of the patch and insert a temporary rigid separator between the adjacent lane and the patch area. Do not use a temporary rigid separator greater than 1/8 inch thick.
Make full depth transverse saw -cuts at the locations marked on the pavement surface . Do not break back the underside of the existing pavement. If break back or spalling occurs, make a new full depth transverse saw-cut beyond the area of break back or spalling. Place the additional length of patch at no additional cost to the Department. If break back or spalling occurs in the adjacent lane, repair the damaged area at a minimum with a full depth Type A concrete patch at no additional cost to the Departme nt. Full depth saw cuts at the patc h limits will be allowed to extend transversely into the adjacent pavement up to full depth + 2 inches provided dowel bars in the adjacent lane are not damaged. Additional full depth transverse saw cuts will be allowed to facilitate slab removal but may not extend transversely into the adjacent pavement to remain in place. Full depth saw -cuts are not allowed to extend into adjacent concrete curb. Perform saw cutting and pavement removal operations by a method acceptable to the Representative that does not damage any concrete curb to remain in place. If the concrete curb to remain in place is damaged by the Contractor, make all necessary repairs at no cost to the Department. For corner repairs, only saw 2 inches in depth and a minimum of 2 inches beyond the damaged area as shown on the Standard Drawings to establish the boundary of the repair. Full -depth cuts will be allowed along the existing joints to relieve restraints of a dowel or a tie bar. Cut and remove exposed sections of dowel and tie bars.
a proposed patch area in a manner that does not damage any adjacent pavement that is to remain in place. As an alternate, a wheel saw having carbide steel tips may be used before making the full depth transverse saw-cuts necessary for the patching joint. Limit penetration of the wheel to minimize disturbance to the subbase. Do not allow wheel saws with carbide steel tips to cut into pavement that is to remain in place. Discontinue using a wheel saw if unsatisfactory results are determined. Remove the concrete in the patch area in one or more pieces minimizing disturbance to the subbase, subgrade, and the adjacent pavement to remain in place . Do not use drop hammers or hydro-hammers. If damage occurs to pavement to remain in place, repair as specified in Section 516.3(b) at no additional cost to the Department. For full depth corner repairs, use a 35 -pound maximum jackhammer to remove the unsound concrete. Operate the jackhammer at a 45 -degree angle or less to taper the boundary and to minimize damage to the remaining sound concrete. If the surface of the subbase is disturbed by the removal technique, recompact the surface using small vibratory compactors. If the disturbed material is deeper than 1 inch, remove the disturbed material with hand tools and replace with concrete during paving at no expense to the Department. Correct all subbase surface irregularities exceeding 1 inch in depth by loosening the surface and removing or adding material as required. Compact the corrected area and surrounding surface by rolling to proper grade and slope.
specified in Section 350.3.
before final inspection and resolution of all issues regarding the condition of the pavement, remove and replace the pavement at no additional cost to the Department. If any patch is replacing an existing expansion joint, and the existing expansion joint in the adjacent lane is remaining in place, install 3/4 -inch expansion joint material in the joint nearest to the remaining expansion joint. Apply bond breaker lubricant to at least one-half of the length of Type B coated dowel bars unless a bond breaker lubricant has been applied in the shop. Stir the lubricant well and apply to the free end of dowels by spraying, or with a gloved hand, to produce a thorough coating. Do not use brushes for lubricant application. Apply the bond breaker lubricant, as specified, at least 1 hour before placing the concrete around the dowel. Provide a tube with a minimum 1 -inch clearance packet, over the lubricated end of all coated dowel bars. Type A coated dowel bars do not need lubricant. For corner repairs, install 1/2 -inch expansion joint material to reestablish original transverse joint location. Drill 5/8-inch diameter holes and install tie bars as shown on the Standard Drawings.
Provide holes a maximum of 1/8 inch larger in diameter than the coated dowel bars. Mount drilling machines in a frame that maintains the proper horizontal and vertical alignment during drilling. Do not use handheld drills or drills that rest upon the subbase or subgrade. Drill holes to ensure the dowel alignment tolerances shown on the Standard Drawings and as specified in Section 501.3(i). Change location of drill holes ±1 inch to avoid existing reinforcing steel. Securely embed the coated dowel bars into place with an approved anchoring material. Inject all the mixed anchoring material into the rear of the hole before inserting the dowel bar. Rotate the dowel three to five complete rotations while inserting the dowel to purge air voids as completely as possible. Immediately trowel all excess anchoring material flush with the vertical face of the patch until the anchorin g material reaches its initial set. Do not leave voids in the anchoring material. Use a plastic retainer washer to hold anchoring material in place, if directed, and remove before placement of concrete in the patch. Provide anchoring material formulated to reach an initial set within 5 minutes of application. Provide a material specification data sheet for the anchoring material used. Render exposed portion of each coated dowel bar bondless as specified in Section 501.3(i).
2.a Dowel Bar Anchor Verification. On the first day of dowel bar anchoring operations for each construction season , the Representative will randomly select three locations from the entire day’s placement to evaluate proper anchoring of dowel bars to provide load transfer across the joint without deflection and to prevent intrusion of moisture. At each location, drill one 4 -inch diameter core directly through the anchored dowel no closer than 3 inches from the joint face. The Representative will determine if the anchoring of the dowels is acceptable. Acceptance will be the summation of voids around the perimeter of the dowel less than 0.50 inch on any one core . If the anchoring of the dowels is acceptable, continue production using the same anchoring operations. If the anchoring of the dowels is not acceptable, additional evaluations of dowel bar anchoring operations will be conducted. Construct a new patching jo int offset 2 feet from each joint determined not ac ceptable at no additional cost to the Department. Clean the vertical surface of any core hole of laitance, loose and foreign material. Fill the holes with the concrete mixture used to construct the pavement and consolidate. As an alternative, use a premixed, non-shrink grout.
existing joints. When patching all adjacent lanes, space joints as shown on the Standard Drawings. Install load transfer units as specified in Section 501.3(i).
accepted by lot as specified in Section 704.1(d)4. For corner repairs, prepare the existing sound concrete surface to ensure proper bond according to manufacturer's recommendations immediately before placing patching material. Mix and place rapid set patching materials according to manufacturer's recommend ations. Provide a copy of the manufacturer's recommendations for the epoxy bonding compound and the patching material to the Representative before installation.
the patch to match the existing pavement cross section. Include any existing wheel ruts. For Type C patches, taper the wheel ruts at both ends of the patch to a straight pavement cross slope, within the patch, with a minimum transition length of 20 feet. Texture all patches to correspond with the texture of the surrounding pavement. If the surrounding pavement has been diamond ground, texture the patch longitudinally. Following the final finishing and before application of curing materials, scribe the date of the patch placement in the surface of the fresh concrete along the shoulder edge of the patch. If the contract includes grinding of the pavement surface, then the matching of wheel ruts and the texturing of the patch surface is not necessary. Make the scribing of the patch dates deep enough that the grinding will not eliminate them.
compound is allowed in stead of white, p oly-alpha-methylstyrene (PAMS) liquid membrane forming curing compound. Cure rapid set concrete patching material repairs according to manufacturer's recommendations.
Use the hole pattern shown on the Standard Drawings. If directed, stabilize as specified in Section 679.
In two-lane width patching being performed at the same time, construct a Type L joint as shown on the Standard Drawings. In two-lane patching being performed one lane at -a-time, or one-lane patching, provide a 1/4 -inch, full depth, polystyrene board bond breaker in the longitudinal joint of Type A and B patches and corner repairs. Do not provide a bond breaker in the longitudinal joint of Type C patches. Provide tie bars in all Type C patches. For all patch types, saw cut the longitudinal joint 1/4 inch wide and 1 inch deep. Center the saw-cut over the joint.
Section 501.3(n). Seal all saw-cuts extending beyond the patch limits.
patch joints using a 12-foot straightedge. Correct, by grinding, any high points or depressions of 3/16 inch or more at no additional cost to the Department unless caused by surface deficiency in existing adjacent pavement. After grinding, retest the area with the straightedge. If the surface still exceeds the above limits, then the area is defective. Remove and replace the defective area at no additional cost to the Department.
cylinders according to manufacturer's recommendations. The Representative will determine when pavement may be opened to traffic based on when the concrete attains the minimum required compressive strength of 1,000 pounds per square inch as measured by compressive strength testing of cylinders according to PTM No. 604.
pavement patches or corner repairs at no additional cost to the Department.
516.4MEASUREMENT AND PAYMENT—
Includes all costs associated with Dowel Bar Anchor Verification.
The Department will not pay for additional work required due to insufficient dowel bar anchoring. For the type indicated. When longitudinal joint cleaning and sealing is part of the contract, the sealing of longitudinal joints is incidental to that item, not to concrete pavement patching. The unit price includes removal of the existing pavement and all repairs or corrections specified in Section 516.3 that are needed as a result of patching operations.
Measurement for additional depth concrete will be taken by the Representative at each corner of the pavement patch. The Representative will average the depth of the measurement taken. Payment for the additional depth will be the average depth of the pavement thickness minus the indicated pavement thickness plus 1-inch.
The unit price includes excavation.
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