Article 1 — Description
Repair concrete pavement to full depth in accordance with the details shown on the plans and the requirements of this Item.
Article 2 — Materials
Furnish materials in accordance with the following. Item 360, “Concrete Pavement” Item 421, “Hydraulic Cement Concrete” Item 440, “Reinforcement for Concrete” DMS -6100 , “Epoxies and Adhesives” DMS -4655 , “Concrete Repair Materials”
2.1 Full-Depth Repair . Obtain approval for the repair material mix design. The selection of repair material
should be based on the time for opening to traffic and temperature range during the repai r.
2.1.1 Hydraulic Cement Concrete for Pavement. Provide Class High Early Strength ( HES) concrete designed to
attain a minimum average flexural strength of 255 psi or a minimum average compressive strength of 1,800 psi within the designated timeframe if the timeframe designated for opening to traffic is less than 72 hr. after concrete placement. Otherwise, provide Class P concrete in accordance with Item 360. Provide material in accordance with DMS -4655 Type A when Class HES concrete does not meet the strength requirement within the designated timeframe.
2.1.2 Asphalt Concrete. Furnish asphalt concrete material for overlay and asphalt shoulder repair as shown on
the plans or when directed. The Engineer may waive quality control tests for this material.
Article 3 — Equipment
Provide tools and equipment necessary for proper execution of the work that meet the pertinent requirements of the following. Item 360 Concrete Demolition Equipment . Provide hammers or hydro- demolition equipment for the bulk removal of concrete. Concrete Lift -Out Equipment . Provide steel chains, lift pins, and a crane or front -end loader capable of lifting the concrete and loading it onto a flatbed or dump truck. Drill. Use a drill with tungsten carbide bits. Air Compressor . Provide compressor equipped with filters designed to remove oil from the air and capable of delivering air to remove dust and debris.
Article 4 — Construction
Submit for approval all materials and methods of application at least 2 weeks before beginning any repair work. Repair locations will be as indicated on the plans or as directed. Repair areas may be adjusted after 461 removing distressed concrete. Compensation will be made for unexpected volumes of repair areas or changes in scope of work.
4.1 Full-Depth Repair . Repair areas identified by the Engineer. Make repair areas rectangular, at least 6 ft. long,
and at least 1/2 a full lane in width, unless otherwise shown on the plans. Ac cept ownership of all removed material, and dispose of it in accordance with federal, state, and local regulations unless otherwise shown on the plans. Saw -cut and remove existing asphalt concrete overlay at least 2 ft. longer than the repair patch in each longitudinal direction when there is existing asphalt concrete overlay over the repair area. Saw-cut the full depth through the concrete around the perimeter of the repair area before removal. Schedule work so that concrete placement follows full -depth sa w-cutting by no more than 7 days unless otherwise shown on the plans or approved. Remove the slab by lifting the slab with a minimum disturbance to the base materials and surrounding concrete. Do not spall or fracture concrete adjacent to the repair area. Saw -cut and remove additional concrete as directed, after slab removal, if distresses are found in the surrounding concrete pavement. Repair damages to concrete pavement caused by the Contractor’s operation without additional compensation. Perform repairs as directed. Remove loose or damaged base material completely, leaving no loose base material. Recompact , if necessary, existing base materials to the Engineer’s satisfaction . Use tie bars to restore the continuity of the concrete pavement as shown on the plans . Demonstrate, by simulated job conditions, that the bond strength of the epoxy -grouted tie bars meets a pullout strength of at least 3/4 of the yield strength of the tie bar when tested in accordance with ASTM E488 within the epoxy manufacturer’s rec ommended curing time. Perform corrective measures and retest when necessary to meet testing requirements. Perform tie bar testing before starting repair work. During the preconstruction meeting, discuss the estimate of the number of epoxy cartridges per repair size that will be used to fill the tie- bar holes. Place tie bars as shown on the plans. Drill holes into the existing concrete at least 10 in. deep unless otherwise directed. Use a drill bit with a diameter that is 1/8 in. greater than that of tie bar s. Clean the holes with a wire brush and compressed air to remove all the dust and moisture. Only cartridge or machine applicator epoxies will be allowed. Follow the epoxy manufacturer’s instructions to apply the epoxy. Insert the tip of the epoxy cartridge or the tip of the machine applicator in to the end of the tie bar hole, and inject Type III, Class C epoxy to fill the entire hole. Insert tie bars. Place new deformed reinforcing steel bars of the same size and spacing as those shown on the plans for continuously reinforced concrete pavement (CRCP) repairs. Lap all longitudinal reinforcing steel at least 25 in. Provide and place supports to firmly hold the new reinforcing steel in place when needed. Place dowel bars as shown on the plans for concrete pavement contraction design (CPCD) repairs. Provide and place supports to firmly hold the dowel bars in place. After removing all loose base material and installing all necessary reinforcing steel, place concrete directly on the remaining existing base. Mix, p lace, cure, and test concrete in accordance with Item 360 and Item 421. Broom -finish the concrete surface unless otherwise shown on the plans. Perform a timely saw -cut over the dowel bars at transverse contraction joints for CPCD in accordance with Section 360.4.10 ., “Sawing Joints.” Clean and seal CPCD transverse contraction joints and any existing longitudinal joints in accordance with Section 360.4.11 ., “Cleaning and Sealing Joints.” Match the grade and alignment of existing concrete pavement. Rep lace any asphalt overlay and shoulder material removed with new asphalt concrete material after concrete strength requirements have been met. 462 Remove repair area debris from the right of way each day. Concrete pavement may be opened to traffic when specified strength is achieved. The maturity method, Tex -426-A , may be used to estimate concrete strength for opening pavement to traff ic, in accordance with Section 360.4.13.3., “Maturity Method.”
Article 5 — Measurement
This Item will be measured by the cubic yard of material in place of the completed concrete area repaired. Volume will be computed based on the measured area in place and the average depth measured in place .
Article 6 — Payment
The work performed and materials furnished in accordance with this Item and measured as specified under “Measurement” will be paid for at the unit price bid for “Repair of Concrete Pavement (Full -Depth).” This price is full compensation for removal, stockpiling, and disposal of waste material and for equipment, materials, labor, tools, and incidentals. Asphalt concrete, pavement markings, and curbing will be paid for under pertinent Items. 400 Items Structures This page intentionally left blank