370 Page 212370 COLD IN PLACE RECYCLING (CIR) OF ASPHALT CONCRETE
370.1DESCRIPTION
This work will consist of milling asphalt pavement, mixing the reclaimed asphalt pavement (RAP) material with emulsified asphalt, placing the recycled mixture, and compacting the recycled mixture according to these specifications and the typical sections in the plans.
370.2MATERIALS
A.Reclaimed Asphalt Pavement (RAP): Section 884. B.Asphalt: Section 890.
370.3CONSTRUCTION REQUIREMENTS
A.Rollers: Pneumatic tired rollers will have an effective roller weight (mass) of at least 250 pounds per inch of roller width or satisfactory vibratory compaction equipment. Tires will be uniformly inflated so their air pressures will not vary by more than 5 psi. Rollers will be operated with tire pressures and wheel loads within the manufacturer’s recommended range for the size and ply of the tire being used. Steel rollers will furnish a minimum rolling weight of 275 pounds per inch of rolling width. B.Equipment Configuration: The cold recycling equipment will consist of a unit or a combination of units which will satisfactorily perform the following requirements: 1.Mill the bituminous pavement and pick up the RAP. 2.Process the RAP material to meet the specified gradation. The RAP material will be processed by a closed circuit system capable of continuously returning oversized material to the crusher. 3.Mix the RAP material uniformly with the specified amount of emulsified asphalt. 4.Deposit the mixture in a windrow or paver. 5.Place and compact the recycled mixture to the specified density with automatic line and grade controls. C.Equipment Performance: The milling unit will be capable of milling the asphalt concrete pavement at least 5 inches deep and a minimum of 12 feet wide in a single pass. The unit will have automatic controls capable of maintaining uniform grade and cross slope. The milling unit will have a continuous weighing system with a meter to accurately measure the amount of water being added at the milling unit. The water pump will shut off automatically if the milling unit is stopped. 370 Page 213The processing unit will separate and remove strips of crack sealant from the RAP material prior to mixing and weighing. The mixing unit will have a continuous weighing system for the processed RAP material, coupled with a meter to accurately maintain the proportion of RAP material and emulsified asphalt at the rate approved by the Engineer. The emulsified asphalt pump will shut off automatically if delivery of RAP material is stopped. The mixing unit will be capable of producing a homogeneous mixture of processed RAP material and emulsified asphalt without segregation. The emulsified asphalt metering system will deliver the specified amount of asphalt to within 0.2% of the required application rate. Positive means will be provided for calibration of the weighing and metering devices. D.Milling and Mixing Operation: The RAP material will be processed to the required gradation and thoroughly mixed with the specified amount of emulsified asphalt. Water may be added to the milling unit or to the RAP material to facilitate mixing, provided the water does not adversely affect the emulsified asphalt. The amount of moisture allowed in the recycled mixture will be 3% or less prior to compaction. Results of the acceptance moisture test performed by the Department will be recorded on a DOT-35 and will be provided to the Contractor as soon as they are completed. The frequency of testing will be performed at a minimum of one per 1/2 mile per lane processed.
Moisture contents will be determined by SD 108; Oven Drying Method or other method approved by the Engineer. The minimum sample size needed to determine the moisture content of the CIP material will be 2000 grams. The recycled mixture will be deposited in a windrow or paver without segregation. The Contractor will have equipment available to equalize the windrow as directed. E.Paving Operations: The recycled mixture will be spread and compacted in a continuous operation confined to the minimum practical length. The laydown machine for the recycled mixture will be controlled by an automatic system for controlling grade and slope and will establish a longitudinal profile grade and transverse slope that is referenced from a traveling stringline. The traveling stringline will utilize either mechanical skis or non-contacting grade averaging sensors. The traveling stringline will have a minimum effective length of 28 feet. The system will be capable of manually controlling the transverse slope. The recycled mixture will be spread and finished in one lift by an asphalt concrete laydown machine. No heat will be applied to the mixture by the laydown machine. The recycled mixture will be placed and finished to within ±0.5% of the cross slope shown on the typical section sheet in the plans. The quarter crown within any 12 foot transverse length (or actual lane width paved with a single paver pass) will not exceed 0.04 feet when measured with a straight edge, stringline, or other suitable equipment. 370 Page 214F.Compaction and Density Requirements: Compaction and density requirement will be a minimum of 97% of the target density. The target density will be established in accordance with SD 219 and compacted under the following conditions: 1.The ambient air temperature is a minimum of 60°F and rising. 2.A minimum of one test strip will be completed to determine the target density and optimum sequence of rollers. The test strip(s) will remain in place as part of the completed work. 3.The depth of the lift will be representative of the project. 4.The Contractor will have, as a minimum, two self-propelled rollers for use on the test strips (double drum vibratory steel roller and a pneumatic tired roller). When there is a significant change in mix proportions, weather conditions, equipment, or other controlling factors the Engineer may require construction of another test strip(s) to check target density. G.Prime Coat Seal and Overlay: The compacted recycled mixture will be primed prior to the overlay. The asphalt prime seal coat will not be placed until the moisture content of the compacted recycled mixture is 2.0% or less. The prime coat and blotter material will be applied as specified in the plans. The Contractor will determine the amount of moisture in the compacted recycled mixture prior to proceeding with the prime coat seal. The moisture tests are for monitoring only and are not for acceptance. The frequency of testing will be performed at a minimum of one per mile per lane processed. The Department will randomly determine sample locations at the determined frequency and ensure that the Contractor obtains samples by approved methods. The Contractor will perform additional moisture tests on a weekly basis from the same area as the initial sample locations, until the compacted recycled mixture has reached specification. Results of the moisture tests will be recorded on a DOT-35 and provided to the Engineer. Moisture content will be determined by SD 108; Oven Drying Method or other method approved by the Engineer. The minimum sample size needed to determine the moisture content of the recycled material will be 2000 grams. The Contractor, at no cost to the Department, will patch all potholes and raveling of the prime and or compacted recycled mixture prior to paving. H.Weather and Seasonal Limitations: Milling, mixing, and laydown of recycled mixture will be completed only when: 1.The ambient air temperature is 60°F and rising. 2.Rain or foggy conditions do not exist. 370 Page 2153.The cold recycling will only be performed as noted above from May 1 to September 15 (inclusive). I.Traffic Control: Cold recycling activities will be permitted from sunrise to sunset. At the end of cold recycling activities each day, the Contractor will open the roadway to normal two- way two-lane traffic. If recycling segments are incomplete at the end of the day the Contractor shall, at no additional cost, place granular material on the incomplete segment to provide a temporary driving surface which is stable and will drain free of standing water. All longitudinal vertical edges will be beveled to a 12:1 slope with the temporary granular material.
370.4METHOD OF MEASUREMENT
A.Cold in Place Recycling Asphalt Concrete: Cold in place recycling will not be measured. Plan quantity will be used unless the Engineer orders additional quantity in writing. Any additional quantity will be measured to the nearest square yard. B.Asphalt for Cold Recycling: Asphalt for cold recycling will be measured to the nearest 0.1 ton.
370.5BASIS OF PAYMENT
A.Cold in Place Recycling Asphalt Concrete: Cold recycling asphalt concrete will be paid for at the contract unit price per square yard. Payment will be full compensation for milling, water, water application, asphalt application, blending, laydown, compaction, and test strips including all equipment, labor, and incidentals required to satisfactorily complete the work. B.Asphalt for Cold Recycling: Asphalt for cold recycling will be paid for at the contract unit price per ton. Payment will be full compensation for the asphalt including all transportation, handling, storage, labor, and incidentals required. 380 Page 216PART D RIGID PAVEMENT 380 PORTLAND CEMENT CONCRETE PAVEMENT
380.1DESCRIPTION
This work consists of constructing Portland Cement Concrete Pavement of sufficient quality to serve the purpose for which the concrete pavement was designed on a prepared surface.
380.2MATERIALS
Materials will conform to the requirements specified in the following Sections: A.Cement: Section 750. Type II cement will be used for all concrete pavement. B.Admixtures: Section 751 and Section 752. C.Water: Section 790. D.Fine Aggregate: Section 800. E.Coarse Aggregate: Section 820. F.Reinforcing Steel: Section 1010 . G.Preformed Expansion Joint Filler: Section 860. H.Joint Sealer: Section 870. I.Curing Materials: Section 821. J.Dowel Bar Assemblies: Section 1010 . K.Fly Ash: Section 605 and Section 753. L.Epoxy Resin Adhesive : Epoxy resin adhesive will be of the type intended for horizontal applications, and will conform to the requirements of ASTM C881, Type IV, Grade 3 (equivalent to AASHTO M 235, Type IV, Grade 3) Class A, B, or C. The minimum gel time will be 5 minutes. M.Non-Shrink Grout : Non-shrink grout will be of the type intended for anchoring horizontal dowel bars or reinforcement bars, (AMBEX AAC or an approved equal by the Department’s Concrete Engineer).
380.3CONSTRUCTION REQUIREMENTS
A.Quality of Concrete and Proportioning: The Contractor will design and be responsible for the performance of all concrete mixes used in the pavement.