503Bridge Approach Slab

503.1 Description. This work shall consist of constructing a reinforced concrete or asphaltic concrete bridge

approach slab on a prepared subgrade in accordance with these specifications and as shown on the plans or as directed by the engineer.

503.2 Material. All material, proportioning, air-entraining, mixing, slump and transporting of Portland cement

concrete shall be in accordance with Sec 501. All material for asphalt shall meet the specification requirements for the mix type specified. Approach slabs shall be constructed of pavement concrete or an approved Class B-1 concrete mixture, or asphaltic concrete. All material shall be in accordance with Division 1000, Material Details, and specifically as follows: Item Section Aggregate for Base 1007.3 Reinforcing Steel for Concrete Structures 1036 Concrete Sealer 1053 Concrete Curing Material 1055 Material for Joints 1057 Polyethylene Sheeting 1058

503.3 Construction Requirements. Concrete bridge approach slabs shall be constructed in accordance with

Secs 703 and 706, and shall attain a compressive strength of 3,200 psi prior to opening to traffic. Concrete bridge approach slabs shall be textured in accordance with Sec 703. Curing shall be in accordance with Sec 502, except the liquid membrane-curing compounds shall be in accordance with Sec 1055 for bridge curing compounds. Bridge approach slabs shall require sealing with a concrete sealer. Asphalt bridge approach slabs shall be constructed in accordance with the specifications for the mix type specified.

503.3.1 Voids Under Completed Concrete Approach Slabs. Prior to acceptance of the work, underseal access

holes may be required to be drilled by the contractor to permit investigation by the engineer of any suspected voids or cavities, which if found shall be filled by the contractor using an approved method. Care shall be taken during pumping operations to avoid raising the approach slab.

503.3.1 1 Filling Holes. At the completion of the investigation or underseal pumping, the holes shall be filled

with sand to within one inch of the top and the remainder filled with joint sealing material.

503.3.2 Ag g reg ate Base. Testing of aggregate base will be completed by the engineer.

503.4 Method of Measurement. Final measurement of the completed bridge approach slab will not be made

except for authorized changes during construction or where appreciable errors are found in the contract quantity. Where required, measurement of the approach slab will be made to the nearest square yard. This area will be measured transversely from out to out and longitudinally from end to end of bridge approach slab. The revision or correction will be computed and added to or deducted from the contract quantity.

503.5 Basis of Payment. The amount of completed and accepted work as shown on the plans, measured as

provided above, will be paid for at the contract unit price. Any access holes required for investigation where no voids or cavities are detected will be paid at the fixed unit price for concrete coring specified in Section 109.16 Fixed Cost Items. No direct payment will be made for the reinforcing steel for concrete bridge approach slabs. No direct payment will be made for investigating void conditions under the completed slab or for filling any voids found for concrete bridge approach slabs.