2540.01 DESCRIPTION.
Longitudinal joint repair shall consist of milling the existing unstable asphalt material down to the PCC base over longitudinal widening joints and the center line joint, as shown in the contract documents or as directed by the Engineer; cleaning and sealing or filling the existing longitudinal opening in the concrete base; and filling the milled trench with the specified mixture. The width to be milled shall be 6 inches (150 mm). However, a 12 inch (300 mm) milling width may be designated in the contract documents. The Engineer may also designate other joints and cracks for this repair.

2540.02 MATERIALS.
Material for filling the longitudinal joint in the PCC base shall be as follows:

A. For a 0 to 3/4 inch (0 mm to 20 mm) opening, the existing joint shall be filled with either PG 58-xx or CRS-2 emulsion.

B. For over a 3/4 inch (20 mm) opening, the existing joint shall be filled with a 3/8 inch to 1/2 inch (9.5 mm to 12.5 mm) commercial HMA mixture with PG 58-xx or other suitable hot or cold bituminous mixture approved by the Engineer.

Material for completing the joint repair (filling the milled trench above the PCC base) shall be a 300,000 ESAL HMA or similar mixture approved by the Engineer.

2540.03 EQUIPMENT.
Milling equipment shall be capable of removing deteriorated material 6 inches (150 mm) in width and up to 7 inches (175 mm) in depth in a single pass operation.

Equipment for removing other deteriorated material and for cleaning the existing joint in the PCC base shall be capable of delivering high pressure compressed air to the joint from a nozzle on a flexible hose.

Equipment for filling joints with bituminous material and equipment for producing and placing asphalt mixtures for the joint and trench filling are intended to be the types for maintenance. The Engineer may waive those requirements that make it impracticable for use of this type of equipment.

Equipment for compacting the lower lifts shall be mechanical tampers meeting the requirements of Article 2001.04, trench rollers, vibratory compactors, or weighted vehicles operated in the trench.

2540.04 CONSTRUCTION.
Removal of the deteriorated material above the longitudinal joint shall be accomplished by the use of milling equipment. All deteriorated material shall be removed to the PCC base surface, including any mesh. This material shall be spread on the adjacent shoulder or removed in accordance with Article 1104.08.

All loose and adjacent deteriorated material shall be removed from the existing joint in the PCC base to a depth of at least 4 inches (100 m) with high pressure compressed air. The joint shall be air blasted twice. Should the air blast remove deteriorated material in a manner to undermine any of the asphalt surfacing, hand tools shall be used to provide a nearly vertical face of sound material. It is anticipated that the blasting operation will, on occasion, remove or indicate the need for removal of material outside of the trenched area. When these additional areas are in excess of 2 square feet in 10 linear feet (0.2 m² in 3 m), they shall be considered as part of the surface patching operation, and the material used to repair these areas shall be measured and paid for as surface patching.

Joints in the PCC Base shall be filled with the material specified in Article 2540.02. The material used to fill joints over 3/4 inches (20 mm) in width shall be spaded and rodded into place and compacted with suitable hand tools to the satisfaction of the Engineer. Care shall be taken to prevent overfilling the joint.

Prior to filling the trench with HMA, the vertical faces and the base of trench shall be lightly tacked. These surfaces shall be clean and dry enough to make this tacking operation effective.

Material for filling the trench shall be placed in uniform lifts of not more than 3 inches (80 mm) in depth. Compaction shall be accomplished by a minimum of three passes with compaction equipment. Cores may be required to ensure that compaction is adequate. The finish elevation of the trench material shall be level with or not more than 1/4 inch (6 mm) above the surrounding pavement surface.

2540.05 LIMITATIONS.
Article 2212.05 shall apply for the limitations to this operation.

2540.06 METHOD OF MEASUREMENT.
Longitudinal Joint Repair will be measured to the nearest 0.1 foot (0.1 m). At locations where the width is increased from 6 inches to 12 inches (150 mm to 300 mm), the length will be doubled.

2540.07 BASIS OF PAYMENT.
The Contractor will be paid the contract unit price per linear foot (meter) of Longitudinal Joint Repair completed. This payment shall be full compensation for all labor, materials, equipment necessary for milling to the existing PCC base, removal of all deteriorated material from the joint and trench, cleaning, filling the joint with the specified material, and filling the trench with HMA.