The Contractor shall furnish equipment capable of mixing the milled bituminous material and asphalt rejuvenating agent into a homogeneous mixture, placing the mixture in a windrow, directly into a truck, the hopper of a paver, or spreader, in one continuous operation. The method of depositing the mixed material shall be so that segregation does not occur.

The Contractor shall provide a positive means for accurately metering the rate of flow and total delivery of the asphalt rejuvenating agent introduced into the mixture.

The Contractor shall use a bituminous paver meeting the requirements of Article 2001.19 or a spreader meeting the requirements of Article 2001.13 to place the recycled material. Heating the screed of the bituminous paver will not be permitted.

The rollers for compacting the recycled material shall meet the requirements of Article 2001.05 for hot HMA mixtures. The Contractor shall have, as a minimum, the following self-propelled rollers for use: a double drum vibratory steel roller and a 25 ton (22.5 Mg) or greater pneumatic tire roller. The vibratory roller may be used in the static or vibratory mode.

2318.04 CONSTRUCTION REQUIREMENTS.

A. Surface Preparation.
Prior to initiating the recycling operation, the Contractor shall clear all vegetation and debris within the width of pavement to be recycled.

B. Milling the Existing Pavement.
The Contractor shall mill the existing pavement to the required depth and width in one pass. The pulverized bituminous material shall be processed to the required gradation.

C. Mixing the Recycled Material.
During recycling operations, the Contractor shall apply the asphalt rejuvenating agent to the pulverized bituminous material at the initial design rate of 0.3 gallon per square yard per inch (0.55 L/m² per 10 mm) of compacted thickness (approximately 2.3% asphalt emulsion by weight (mass) of material), unless otherwise specified in the contract documents. The Engineer may vary the application rate of asphalt rejuvenating agent as required by existing pavement conditions. The Contractor shall maintain, at all times, an allowable tolerance of ± 0.2% of the rate of application as determined by the Engineer. The Contractor may add water to the pulverized material to facilitate uniform mixing with the asphalt rejuvenating agent. The water may be added prior to or concurrently with the asphalt rejuvenating agent. Adding water to facilitate uniform mixing shall not adversely affect the asphalt rejuvenating agent.

D. Placement of the Recycled Material.
The Contractor shall deposit the recycled material in a windrow, spreader, paver, or loaded into trucks, without segregation.

The Contractor shall place and finish the recycled material in one continuous pass, without segregation, to the lines and grades established by the Engineer. When a pick-up machine is used to feed the windrow into the paver hopper, the pick-up machine shall be capable of picking up the entire windrow to the underlying material.

E. Compaction and Density.
The field density shall be a minimum of 92% for non-Primary roads, and 94% for Primary Roads, of laboratory density based on the dry weight (mass) of compacted material in accordance with Materials I.M. 504. The Contractor shall perform seven nuclear gauge moisture and density tests per day's run at locations determined by the Engineer in accordance with Materials I.M. 504.

The Contractor shall perform initial rolling with a pneumatic tired roller to achieve the required target density. The Contractor shall perform final rolling to eliminate pneumatic tire marks by steel wheel rollers, either in static or vibratory mode. Additional rolling may be required within 2 calendar days after the initial mixing and rolling to achieve the target density on the completed in-place recycled pavement.

The Contractor shall discontinue any type of rolling that results in cracking, movement, or other types of pavement distress until such time that the problem can be resolved. Discontinuation and commencement of rolling operations shall be at the sole discretion of the Engineer.

If there is a significant change in mix proportions, weather conditions, or other controlling factors the Engineer may require construction of test strips to check target density.

2318.05 LIMITATION OF OPERATIONS.
Except in specific cases when permitted by the Engineer, the Contractor shall perform cold in-place recycling between May 1 and October 1.

When resurfacing is part of the contract, all cold-in-place recycled surfaces shall be covered with at least one full lift of HMA prior to winter shutdown.

The Contractor shall not perform recycling operations when the ambient temperature is below 60°F (16°C), or when the weather is foggy or rainy, or when weather conditions are such that proper mixing, placing, and compacting the recycled material cannot be accomplished.

If the road is to be open to traffic prior to the completion of the project, the Contractor shall place and compact material in the recycled sections and remove the equipment from the roadway to provide normal traffic flow.

Any subsequent surface treatment or overlay will not be allowed until the in-place recycled pavement has been allowed to fully cure and the moisture content of the recycled mixture is less than 1.5%. The Engineer may adjust this curing period depending on field conditions.

2318.06 METHOD OF MEASUREMENT.

A. Cold In-Place Recycled Asphalt Pavement.
The Engineer will compute the area in square yards (square meters) from the measured longitudinal length of pavement to the nearest 0.1 foot (0.1 m) and the width of pavement specified in the contract documents.

B. Asphalt Rejuvenating Agent.
The Engineer will measure the Asphalt Rejuvenating Agent in gallons (liters), through a calibrated pump used for metering the total delivery of the agent.

2318.07 BASIS OF PAYMENT.

A. Cold In-Place Recycled Asphalt Pavement.
The Contractor will be paid the contract unit price per square yard (square meter) for Cold In-Place Recycled Asphalt Pavement. This payment shall be full compensation for all labor, material (including mixing water), and equipment necessary for surface preparation, milling, mixing, spreading, placing, shaping, and compaction of the completed In-Place Recycled Asphalt Pavement.

B. Asphalt Rejuvenating Agent.
The Contractor will be paid the contract unit price per gallon (liter) for Asphalt Rejuvenating Agent. This payment shall be full compensation for all labor, materials and equipment necessary for furnishing the agent and application of the agent into the milled bituminous material.