PATCHING
518.1DESCRIPTION —This work is the construction of one course, full -depth, continuously reinforced
cement concrete pavement patches. Do not patch less than one lane width.
a sealant reservoir, and seal the joint.
6 feet and 20 feet long if using tied splices and between 4 feet and 20 feet long if using welded splices.
20.1 feet and 65 feet long.
65.1 feet and 500 feet long.
518.2MATERIAL—Section 516.2 with the following modifications:
Section 501.2 Material. Add the following:
518.3CONSTRUCTION—As specified in Section 516.3, modified as follows:
No saw cuts will be allowed to extend into the adjacent pavement or shoulders that is to remain in place. Make initial, full-depth, transverse saw-cuts from the outside edge of the pavement toward the longitudinal saw-cut as shown on the Standard Drawings. Use methods that assure full depth vertical cuts to allow the interior portion of the patch to be removed as specified in Section 516.3(c) . Make a second, 1-inch minimum depth, transverse saw -cut at each end of the patch area, parallel to and outside the initial saw-cut the distance shown on the Standard Drawings for the type of rebar splices to be used. Do not saw cut across an existing crack. Do not locate saw -cuts within 24 inches of an existing crack. Do not cut reinforcement bars when making the partial depth saw -cuts. If any of the reinforcement bars are cut, take corrective action by making the partial depth saw -cut a full-depth cut and making another partial depth (1 inch minimum) saw -cut located as specified above. Place the additional length of patch at no additional cost to the Department.
saw-cuts, before making the 1- inch minimum depth saw -cuts. A wheel saw having carbide steel tips may be used, while making the full -depth transverse saw-cuts, to provide a trench across the slab to rel ieve compression in pavement before lifting out failed area. Limit penetration of wheel into the subbase to a maximum of 1/2 inch. Do not allow the wheel to cut into pavement that is remaining in place. Discontinue use of the wheel saw if unsatisfactory results are obtained as determined by the Representative. Install lifting devices and lift out the concrete in the area enclosed by the full -depth saw-cuts, in one or more pieces, without disturbing existing subbase. Remove the concrete strips at each end of the patch area with jackhammers and hand tools. Limit jackhammer size to 30 pounds maximum. Do not damage existing reinforcement bars within
the concrete strips. Do not break back the underside of the existing pavement. If break back greater than 2 inches or damage to existing reinforcement bars occurs, make a new full-depth, transverse saw-cut beyond the area of break back. Saw cut a new outside edge, maintaining the appropriate bar length at the edge of patch. Place the additional length of patch at no additional cost to the Department. If the existing pavement was constructed on top of a bond breaker, remove the bond breaker from the top of pavement base. Place two layers of 4.0 mil minimum polyethylene sheeting to be used as a new bond breaker before placing concrete. Cut the polyethylene sheeting to the surface dimensions of the patch. If the surface of the subbase is disturbed by the removal procedure, recompact the surface using small vibratory compactors. If subbase material is disturbed to a depth greater than 1 inch, remove the disturbed material with hand tools and replace with concrete during paving at no additional cost to the Department.
as shown on the Standard Drawings . Firmly support and tie bars at every intersection to re-establish the continuous reinforcing. Use tied or welded splices. Lap the new reinforcement bars with the existing bars as shown on the Standard Drawings for the type of rebar splices to be used. Weld splice as specified in Section 1105.03(m) and as shown on the Standard Drawings. When weld splicing, lap tie bars at the center of the patch, as shown on the Standard Drawings, to allow for expansion.
518.4MEASUREMENT AND PAYMENT—
For type indicated. The unit price includes removal of the existing pavement and repairs or corrections as specified in Section 516.3 that are needed as a result of patching operations.
The unit price includes excavation.
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