Sec 814 Asphalt pavement patching.pdf

815 PAVED SURFACE CLEANING 1

814 ASPHALT PAVEMENT PATCHING (5/97)

1. DESCRIPTION

This work consists of patching potholes and skin patching of asphalt surfaces. The work includes preparing the area to be patched, furnishing and placing all necessary materials and work. All areas to be patched will be marked by the Government.

2. MATERIALS

Materials used for asphalt patching shall conform to the requirements in Sections 892 and 893.

Bituminous mixture material shall conform to requirements of Special Project Specifications.

3. MAINTENANCE REQUIREMENTS

a. Potholes

1) Existing materials shall be removed to a minimum of two (2) inches or as necessary to reach firm support, but limited to maximum twelve (12) inch depth. If firm support for a patch is not available, the hole shall be barricaded and the Government shall be notified.

Prior to Contractor placing any materials, Government will determine corrections to be made.

2) The edges of the prepared hole shall be extended to form a vertical face in un-fractured asphalt surfacing. The prepared hole shall generally be round or rectangular in shape and cleaned of all loose material. The bottom and sides shall be sprayed with an emulsified asphalt.

3) Prepared potholes shall be patched or barricaded immediately.

4) The bituminous mixture shall be placed in layers not exceeding four (4) inches. Each layer shall be compacted thoroughly with hand tampers, mechanical tampers, or rollers.

5) Finished surface shall, as a minimum, be compacted with a tamper or an 8- to 10-ton steel roller or comparable vibratory roller. Upon completion, the compacted pothole patch shall be flush with or not more than one quarter (1/4) inch above the level of the adjacent pavement.

b. Skin Patches

1) Prior to skin patching, potholes shall be patched.

2) Minor depressions, light raveling, or surface checking at scattered locations shown on the

Drawings or marked on the ground shall be treated by applying a skin patch.

3) Prior to skin patching, the surface shall be cleaned of loose and deleterious material, then sprayed with emulsified asphalt at the rate ordered by the Government. No bituminous mixture shall be placed until the prepared surface is approved by the Government.

815 PAVED SURFACE CLEANING 2

4) Bituminous mixture shall be distributed uniformly in layers not to exceed two (2) inches compacted depth. When multiple layers are required, joints shall be offset at least six (6) inches between layers.

5) Each layer shall be compacted with an eight (8) to ten (10) ton steel roller or comparable vibratory roller.

6) The completed patch shall have transitions which shall be at least as smooth as the adjacent pavement after twenty-four (24) hours of exposure to traffic.

c. Disposal

1) All materials removed from pothole and skin patching operations shall be removed to a disposal site designated by the COR or shown on the drawings.

4. MEASUREMENT

a. Bituminous Mixture

1) Hot and cold bituminous mixture acceptable placed will be measured by the ton.

Bituminous materials incorporated into the mixture will be incidental to the item.

2) Ton Measure - The quantity of mixture will be the number of tons in the accepted work.

Any material rejected in the field as not meeting specifications shall be deducted based on estimated quantities. Rejected quantities shall be reconciled between the Government and the Contractor each day. If not reconciled each day, the Government's figures will apply.

b. The following work is incidental:

1) Cleaning of surfaces.

2) Haul and compaction of bituminous mixture.

3) Material removal and disposal.

4) Emulsified asphalt used on existing surfaces will be measured by the gallon prior to dilution. Dilution materials shall be considered incidental.

5. PAYMENT

a. The accepted quantities will be paid for at the contract unit price shown in the Schedule of Items.

b. Payment will be made under:

Pay Item Description Pay Unit

814 (1) Pothole Patching Ton

814 (2) Skin Patching Ton

814 (3) Emulsified Asphalt Gallon