726— Bridge Deck Patching

726.1 Description

1 Install partial and full depth concrete patches on existing bridge decks.

726.2 Materials

1 Unless noted otherwise, use Class 4000 concrete that conforms to Section 701 . Where patching quantities are limited, such that less than 3 cu y d will be placed in a shift, proprietary mixes may be submitted to the BCE for consideration. 2 Use moisture resilient epoxy bonding compound that meet s ASTM C881.

726.3 Construction

726.3.1 Concrete Removal for Full Depth Patching

1 The area of removal of the concrete to full depth is from center of girder to center of girder. If the full depth holes are small (less than 6 sq ft), the RCE will consult with the BCE for the method in which the areas are to be repaired. 2 Outline the defective areas and sawcut the outline to a minimum depth of 1½ in. or as limited by the existing reinforcing steel concrete cover. 3 Remove all defective and/or delaminated concrete in the outlined areas through the full depth of the slab or deck by use of a concrete milling machine and/or pneumatic hammers as necessary. A mechanical scarifier may be used on small areas. If pneumatic hammers are used, limit the maximum size to 40 lb. Do not damage the reinforcing steel or the vertical sawcut sides during concrete removal. Replace reinforcing steel damaged by concrete removal operations at no additional cost to the Department. Ensure that adequate precautions are taken to contain debris.

726.3.2 Concrete Removal for Partial -depth Patching

1 Outline the defective areas and sawcut the outline to a minimum depth of 1½ in. or as limited by the existing reinforcing steel concrete cover. 2 Remove all defective and/or delaminated concrete in the outlined areas by use of a concrete milling machine and/or pneumatic hammers to a minimum depth of 1 in. below the top mat of reinforcing steel. A mechanical scarifier may be used on small areas. If pneumatic hammers are used, limit the maximum size to 40 lb . If removal of unsound concrete extends through ½ of the depth of the concrete slab or deck, remove the remaining sound concrete and replace as outlined herein for full -depth patching. Do not damage the reinforcing steel or the vertical sawcut s ides during concrete removal. Replace reinforcing steel