The Table of Contents for this section is available.
The work covered by this section consists of the construction of reinforced concrete slabs at bridge approaches, along with curbs, sidewalks, temporary slope drainage systems, and subsurface drainage systems, all in accordance with these specifications and the details shown on the plans.
Unless otherwise shown on the plans or permitted by the Engineer, approach slabs shall not be constructed on embankments until at least 3 months after completion of the embankment. The approach slabs shall be constructed before concrete barrier rails or sidewalks are constructed.
All materials shall meet the requirements of Division 10 shown below:
Portland cement concrete Section 1000
Curing agents Section 1026
Joint filler Article 1028-1
Joint sealer Article 1028-2
Reinforcing steel Section 1070
Subdrain fine aggregate Article 1044-1
Stone, No. 78M Section 1005
Aggregate base course Articles 1010-1, 1010-2, 1010-3, and 1010-4
Corrugated aluminum alloy pipe Article 1032-2
Corrugated steel pipe Article 1032-3
Corrugated polyethylene (PE) pipe Article 1044-6
A stone drain consisting of 1 cubic foot of No. 78M stone contained in a porous fabric bag shall be placed at each pipe drain located in the end bent cap or abutment and shall be securely tied. Subdrain fine aggregate shall be placed in conjunction with the stone drain as shown on the plans.
The subdrain fine aggregate shall be placed and compacted in accordance with Article 41010.
The subgrade shall be constructed in accordance with Section 500.
The aggregate base course shall be constructed in accordance with Section 520.
The asphalt concrete base course shall be constructed in accordance with Section 630.
The provisions of Section 420 shall be applicable to all concrete except as otherwise provided herein. Class AA concrete shall be used for all concrete.
The reinforced concrete bridge approach slabs shall be finished and grooved in accordance with the requirements of Article 42015, except that grooving of the approach slabs will not be required when grooving of the bridge floor is not required.
When grooving is not required, the approach slabs shall receive a tined surface texture before the concrete becomes non-plastic. The surface texture shall be perpendicular to the bridge centerline, and shall be produced by a broom or comb having a single row of tines which shall produce grooves that are spaced at intervals of approximately 1/2 inch. The grooves in the hardened surface shall be approximately 1/8 inch in width and 3/16 inch in depth.
Bridge approach slabs shall be cured in accordance with the requirements of Article 42016 that are applicable to bridge floors, except that curing with clear membrane curing compound will be permitted.
The opening in the joint at the end bent shall be temporarily covered or filled until the joint seal is installed. The covering or filler shall provide for drainage off the bridge floor and shall keep debris out of the joint and off the end bent cap.
The concrete curb shall be shaped to match the face of the barrier rail. The curb shall not be placed within the limits shown on the plans until sawing of the joint at the end bent has been completed. The concrete shall be given a light broom finish with the brush marks parallel to the curb.
When sidewalks are shown on the plans, they shall be constructed on bridge approach slabs in accordance with plan details. Sidewalks shall not be constructed until sawing of the joint at the end bent has been completed. The concrete shall be finished in accordance with Subarticle 42018(D).
The temporary slope drainage system shall include the earth ditch block, erosion resistant surface material, Class B stone for erosion control, and the pipe. It shall be located as shown on the plans.
The temporary drainage pipe shall be either corrugated polyethylene (PE), corrugated steel, or corrugated aluminum alloy. Perforated pipe will not be permitted. The temporary pipe shall be of sufficient length for complete drainage away from the roadway embankment.
The approach slabs shall be backfilled as soon as practical to prevent erosion adjacent to the slab.
All work covered by this section except for grooving bridge approach slabs will be paid for at the contract lump sum price for "Bridge Approach Slabs, Sta. ________________". Such price and payment will be full compensation for all work covered by this section at each bridge installation, including but not limited to removal of existing pavement or existing bridge approach slabs; furnishing and placing subsurface drainage materials; furnishing and placing temporary drainage systems; constructing the subgrade; furnishing and placing the base course; furnishing and placing concrete, reinforcing steel, joint filler and sealer, and any other materials; and finishing, tineing, and curing the concrete.
Grooving bridge approach slabs will be paid for at the contract unit price per square foot for "Grooving Bridge Floors" as provided in Article 42022.
Payment will be made under:
Bridge Approach Slabs, Sta. ____________ Lump Sum