526Approach Slabs

526.01 Description. This work consists of constructing reinforced portland cement concrete

approach slabs for bridges on the completed and accepted subgrade or subbase.

526.02 Materials. Furnish materials conforming to:

Concrete, Class QC 2* .......................... 499 Epoxy coated reinforcing steel .................... ......................................... 509.02, 709.00 Preformed joint filler........................ 705.03 Joint sealer ....................... 705.04 or 705.11 * Use the same class of concrete used in the bridges superstructure that the approach slab is attached to unless otherwise shown in the plans. If the super-structure concrete class for the bridge is not identified in the plans use Class QC 2.

526.03 Forming, Furnishing and Placing Reinforcing Steel. Furnish true and straight steel or

wooden side forms. Securely brace and hold forms to the line and grade shown on the plans. Do not allow forms to vary more than 1/8 inch (3 mm) from a 10 foot (3 m) straightedge. Do not remove forms for a minimum of 36 hours. Clean and oil forms after each use. Furnish reinforcing steel and place it in the position shown on the standard construction drawing and firmly secure the steel during placing and setting of the concrete. Tie reinforcing bars at all intersections, except tie reinforcing bars at alternate intersections where bar spacing is less than 1 foot (0.3 m) in any direction.

526.04 Placing and Sampling Concrete. Immediately before placing concrete according to Item

511. 07, thoroughly moisten the subgrade or subbase with water in the amount and manner directed by the Engineer. When the bridge superstructure and the approach slab require QC/QA, make at least one set of test cylinders for each 50 cubic yards (35 cubic meters) of concrete. Include the results of the cylinders into the Lot for the 511 superstructure item. Provide a Concrete Cylinder Cure Box as per 511.04.

526.05 Finishing and Curing . Mechanically screed, at a vibration frequency of 1500 to 5000

pulses per minute, the concrete surface to the proper elevation in one complete pass with a minimum of hand finishing. Cure approach slabs according to 511.13.A. Seal joints and cracks according to

511.19 If the approach slab is to serve as a base for an asphalt concrete wearing course, texture the

approach slab according to Item 305. If the approach slab is to serve as a wearing surface, test the surface according to 451.13, and diamond groove the surface according to 511.17. Open approach slabs to traffic according to Table 511.14-1A or Table 511.14-1B.

526.06 Side Curbs. If concrete curb extends across the approach slab, construct side curbs of the

dimensions required, and place the concrete curb at the same time as the approach slab. Finish the curb according to Item 609.

526.07 Method of Measurement. The Department will measure Reinforced Concrete Approach

Slabs by the number of square yards (square meters) complete in place.

526.08 Basis of Payment. The Department will calculate the final adjusted payment per 511 and

Supplement 1127. The Department will pay for accepted quantities at the contract price as follows which includes all concrete, curbs, reinforcing steel, dowels, joints and other materials: Item Unit Description 526 Square Yard Reinforced Concrete Approach Slabs (Square Meter) 526 Square Yard Reinforced Concrete Approach Slabs with (Square Meter) QC/QA 600 INCIDENTALS

Approach Slabs in other states

• West Virginia 502 · Approach Slabs