SECTION 551 – BRIDGE DECK REHABILITATION
551.01 Description
This Section describes the requirements for repairing or scarifying existing concrete bridge decks.
551.02 Materials
551.02.01 Materials
Provide materials as specified: Coarse Aggregate ................................ ................................ ................................ ................................ ..... 901.06.01 Fine Aggregate ................................ ................................ ................................ ................................ ......... 901.06.02 Concrete ................................ ................................ ................................ ................................ ...................... 903.03 Quick-Setting Patch Materials ................................ ................................ ................................ ...................... 903.07 Curing Materials ................................ ................................ ................................ ................................ .......... 903.10 Reinforcement Steel ................................ ................................ ................................ ................................ ..... 905.01 Rebar Coupling Devices ................................ ................................ ................................ ............................... 905.04
551.02.02 Equipment
Provide equipment as specified: Spreading and Finishing Machine for Concrete Bridge Decks ................................ ................................ ...... 1005.03 Vibrator ................................ ................................ ................................ ................................ ...................... 1005.04 Scarification Equipment ................................ ................................ ................................ .............................. 1006.09 Straightedge ................................ ................................ ................................ ................................ ................ 1008.02 Mechanical Sweeper ................................ ................................ ................................ ................................ ... 1008.03 Pavement Saw ................................ ................................ ................................ ................................ ............. 1008.04 Concrete Batching Plant ................................ ................................ ................................ .............................. 1010.01 Concrete Trucks ................................ ................................ ................................ ................................ .......... 1010.02 Mobile Mixer ................................ ................................ ................................ ................................ .............. 1010.03 Small-Batch Mixer ................................ ................................ ................................ ................................ ...... 1010.04 Submit technical data sheets for the proposed pneumatic hammers to the RE for approval.
551.03 Construction
551.03.01 Concrete Deck Repair
A Deck Condition Survey. The RE will perform the deck condition survey before scarification, if scheduled, and after the removal of any existing HMA overlay and waterproofing membrane. Submit written notice to the RE at least 15 days before the work site is available for a deck condition survey. The Department will schedule surveys during daylight hours unless the working time is restricted in the Contract. The RE will perform surveys only if the ambient temperature has been above 40 °F for at least 72 hours before the beginning of the survey and only if the deck is dry. The RE will use the data obtained to determine the repair limits. Provide safe access for the RE as specified in
105.01 02.
B.Sawcut and Removal. When Type C repair is specified or full depth repair is required, provide temporary shielding, as specified in 201.03.09, to prevent debris from falling below the deck. Sawcut repair areas to a 3/4 inch depth. Remove loose and disintegrated concrete from the areas to be repaired to a sound concrete surface. Ensure that the remaining concrete is not damaged during concrete removal. Ensure that the reinforcement steel is not damaged or debonded during concrete removal. The Contractor may remove concrete or prepare and shape repair areas with power chipping or hand tools. Do not use pneumatic hammers heavier than 33 pounds. The Contractor may start such tools in the vertical position but must im mediately tilt to a 45 degree operational angle. Do not operate pneumatic hammers and chipping tools at an angle exceeding 45 degrees relative to the surface of the deck slab. Do not use pneumatic hammers heavier than 20 pounds for chipping areas directl y below the top longitudinal reinforcement steel or within 6 inches of the primary girder reinforcement steel, such as stirrups in prestressed concrete girder configurations. Remove concrete to the depth specified for the following type of repair.
1.Type B Repair. For Type B repair, remove delaminated, deteriorated, and designated deck concrete to a minimum depth of 1 inch below the bottom of the top layer of existing reinforcement steel to a maximum depth of 50 percen t of the thickness of the existing concrete deck. The RE may require the Contractor to remove sound concrete to achieve the limits of the designated repairs.
2.Type C Repair. For Type C repair, remove delaminated, de teriorated, and designated deck concrete for the full depth of the existing deck. The RE may require the Contractor to remove sound concrete to achieve the limits of the designated repairs. Collect the concrete and reuse as specified in 202.03.03.C.1.
C.Cleaning and Splicing Reinforcement Steel . Clean corroded, uncoated reinf orcement steel by sandblasting, waterblasting, or wire brushing. For coated steel, clean areas where the coating is damaged by wire brushing and repair the coating according to AASHTO M 284. For reinforcement steel that has lost 25 percent or more of its original cross sectional area, splice in or couple new epoxy -coated reinforcement steel of the same size. Lap the reinforcement steel at least 15 bar diameters from each end of the damaged area and wire tie together. If necessary, perform additional chi pping of adjacent concrete to provide for this lap. Where reinforcement steel is broken or missing, lap new bars at least 30 bar diameters from each end of the break.
D.Patching. The Contractor may use Class A concrete or Type IA or IB quick -setting patch material, whichever is specified. For Type C Repair, provide forms for placing the patch material.
1.Class A Concrete. Perform patching within the limitations specified in 504.03.02.C. Place concrete as specified in 405.03.02.D.1.b, consolidate and strike -off as specified in 405.03.02.D.1.c, and texture with a broom. Cure the repair areas as specified in 504.03.02.F. Do not place traffic, equipment, or other loading on the patch material until the concrete has cured 72 hours and has attained a minimum strength of 4,000 pounds per square inch as determined from 2 test cylinders cast during placement and field cured.
2.Quick Setting Patch. For Type IA or IB quick -setting patch material, place according to the manufacturer’s recommendations. Wet cure the patched area using wet burlap, as specified in 504.03.02.F.2, immediately after placing and finishing. Keep the patched area covered for 3 hours. Do not open repair to traffic until compressive strength attains a minimum of 2,000 pounds per square inch as determined from 2 test cylinders cast during placement and field cured. If the required compressive strength is not met by the time the roadway must be opened to traffic, open to traffic. Remove and replace the repair during the next available roadway closure.
551.03.02 Scarification
Before beginning concrete removal, perform a field survey for each stage of construction to establish existing grades and cross slopes and determine finished grades and cross slopes. Take elevations longitudinally every 10 feet and transversely at the gutterlines, breaklines, and the center of each lane and shoulder. The RE may direct additional elevation checks in areas with rapid changes in grade so that intermediate longitudinal checks can be made. Submit the field survey to the RE 5 days before scarifying. Scarify the surface and ensure that the existing transverse and longitudinal joints are not damaged. Remove concrete and other materials that result from scarifying by hand, mechanical sweeper, or vacuum, and reuse as specified in
202.03.03 C.1. Do not use water or air to remove the scarified material.
If the RE designates additional areas of deteriorated concrete for repair after scarification, repair the areas as specified in
551.03 01.
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 301–302 of 651. View official source ↗