332 Page 201332 COLD MILLING ASPHALT CONCRETE
332.1DESCRIPTION
This work consists of cold milling a portion of the existing asphalt concrete surface course and hauling and stockpiling the removed material.
332.2MATERIALS
Cold milled asphalt concrete will conform to the requirements of Section 884.
332.3CONSTRUCTION REQUIREMENTS
A.General: The material will be removed by cold milling with the specified equipment, without the use of heat. The Contractor will not dispose of cold milled asphalt concrete material or use the cold milled material for any purpose other than purposes designated in the plans without approval by the Engineer. B.Equipment: The equipment for cold milling will consist of a rotating drum equipped with teeth capable of removing material to a depth of up to 3 inches in one pass, producing a uniform surface finish. The cold milling machine will establish a longitudinal profile grade within ±1/8 inch referenced from a traveling stringline or erected fixed string line and will be controlled by an automatic system for controlling grade. The cold milling machine will be equipped so that the depth and transverse slope of the drum is manually or automatically controlled using the traveling or fixed stringline on either or both sides of the milling machine. The fixed stringline will remain taut after being tightened. The traveling stringline will have a minimum effective length of 28 feet. The traveling stringline will be attached and positioned on the milling machine to reference the longitudinal profile. The traveling stringline will utilize either mechanical skis or non-contacting grade averaging sensors. If mechanical skis are provided, the sensor of the control system will rest midway between the traveling stringline. Following milling of the first pass, adjacent passes will be milled referencing the traveling stringline riding on the previously milled pass or a fixed stringline. A shoe attachment may be used to match an adjacent reference point when directed by the Engineer. The drum will be capable of tilting to allow feathering of edges to zero cut. C.Construction Methods: The existing surface of the pavement will be removed by milling to the depth, width, cross section, and grade specified. The resulting milled surface will be free of detrimental ridges or grooves. The final pavement surface will have a transverse pattern of 3/4 inch center to center of each strike area. The difference between the ridge and valley of the mat surface will not exceed 1/4 inch when tested in accordance with SD 320. 332 Page 202The milled section will be finished to the cross slope shown on the typical section ±0.2%. The quarter crown within any 12 foot transverse length (or the actual lane width paved with a single paver pass) will not exceed 0.04 foot when measured with a straightedge, stringline, or other suitable equipment. The Engineer may order changes to the typical section if field conditions warrant. All vertical cuts from cold milling operations left and right of the centerline will be daylighted to the outside edge of the road to allow surface water to be drained off the roadway. Daylighting will be accomplished by methods satisfactory to the Engineer. When Traffic will be exposed to the milled surface, all cold milling asphalt concrete will be accomplished on one-half of the roadway at a time. The contractor will schedule the cold milling asphalt concrete operations so that there are no drop offs, uneven lanes, or windrows of milled material remaining on the roadway overnight. At the end of the day the Contractor will place cold milled asphalt concrete material to provide temporary ramps as a transition onto or off the milled surface and the project limits, bridge approaches, and intersecting roads. The resultant transition will be of sufficient length to provide a slope no steeper than 20 feet:1 inch. 1.Cold Milling Asphalt Concrete and Placing Cold Milled Material: The Contractor will place the cold milled asphalt concrete material directly on the shoulder of the roadway to the dimensions of the typical sections or as directed by the Engineer. The Contractor may need to adjust the depth of milling due to rutting or other roadway irregularities to create the proper grade line, cross section, and cross slope and to obtain the material required for the shoulders. Some areas of the shoulder may require the movement of cold milled asphalt concrete material either ahead or back to achieve the required cross section. No separate payment will be made for the movement of this material. Material placed on the shoulders will be compacted according to Section 260.3 D except that a pneumatic tired roller with an effective roller weight of at least 250 pounds per inch of roller width will be required. At the time of compaction, the cold milled asphalt concrete material placed on the shoulder will contain approximately 4% moisture uniformly blended throughout the depth of the material. The percent moisture may be adjusted by the Engineer. Prior to allowing traffic on the milled surface, the surface will be thoroughly broomed free of remaining loose material. In rural sections where a finished and maintained lawn extends to the edge of the shoulder, the Contractor will use a pickup broom with an integral self-contained storage. The pickup broom must be a minimum of 6 feet wide. The sweeping operation must remove all loose material, including loose material from the gutter. A rotary power broom may be used in all other areas. 2.Cold Milling Asphalt Concrete: Loose material resulting from the milling will be immediately picked up, hauled to the stockpile site(s), and stockpiled. Prior to allowing traffic on the milled surface, the surface will be thoroughly broomed free of remaining loose material. In curb and gutter sections or in rural sections where a finished and maintained lawn extends to the edge of the shoulder, the Contractor will use a pickup 332 Page 203broom with an integral self-contained storage. The pickup broom must be a minimum of 6 feet wide. While sweeping in curb and gutter sections, the sweeping operation must remove all loose material, including loose material from the gutter. A rotary power broom may be used in all other areas. Cold milled asphalt concrete material will be processed or crushed and stockpiled so that a uniform blend is obtained. Prior to stockpiling, the stockpile site will be prepared by removal of the top 6 inches of topsoil and the area bladed smooth. Stockpiles will be constructed in accordance with Section 320. The stockpiles will not contain dirt, grease, oil, brick, paving fabric, clay balls, organic debris, and other foreign material.
332.4METHOD OF MEASUREMENT
A.Cold Milling Asphalt Concrete and Placing Cold Milled Material: Cold milling asphalt concrete and placing cold milled material will not be measured. Plans quantity will be used. If changes from the plans quantity are ordered these areas will be measured and the plans quantity will be appropriately adjusted. Water for granular material, added during laydown operations, and materials which are paid for under separate items will not be measured under this item. B.Cold Milling Asphalt Concrete: Cold milling asphalt concrete will not be measured. Plans quantity will be used. If changes from the plans quantity are ordered these areas will be measured and the plans quantity we be appropriately adjusted.
332.5BASIS OF PAYMENT
A.Cold Milling Asphalt Concrete and Placing Cold Milled Material: Cold milling asphalt concrete and placing cold milled material will be paid for at the contract unit price per square yard or as indicated in the plans. Payment will be full compensation for the removal of grass, weeds, topsoil, etc. from the placement location, milling, removing, placing, and compaction of the cold milled material and brooming, equipment, labor, and all incidentals required. B.Cold Milling Asphalt Concrete: Cold milling asphalt concrete will be paid for at the contract unit price per square yard or as indicated in the plans. Payment will be full compensation for milling, removing, hauling, stockpiling, processing or crushing the cold milled material, brooming, equipment, labor, and all incidentals required. 350 Page 204350 ASPHALT CONCRETE CRACK SEALING
350.1DESCRIPTION
This work will consist of routing and sealing transverse and longitudinal cracks in an asphalt concrete roadway surface with the specified sealant.
350.2MATERIALS
Asphalt concrete crack sealant will conform to Section 871.
350.3CONSTRUCTION REQUIREMENTS
A.Routing 1.Routing equipment will be mechanical, power driven, and capable of cutting a reservoir to the required dimensions. Equipment designed to plow the cracks to dimension will not be permitted. 2.Cracks which are less than 3/4 inch in width or depth will require routing to a width and depth of 3/4 to 7/8 inch. 3.Cracks which are 3/4 inch or greater in width and depth will not require routing but will be thoroughly cleaned of foreign material to a depth equal to the width of the crack. 4.The walls of the finished reservoir will be vertical, and the reservoir bottom will be flat. 5.Routing will not be allowed when the roadway is wet. B.Cleaning 1.Cleaning will be accomplished with an air compressor producing a minimum of 125 cubic feet per minute output and equipped with a maximum 3/4 inch nozzle. The air compressors will be equipped with traps capable of removing all free water and oil from the compressed air. 2.Reservoirs and cracks will be thoroughly cleaned of dust, dirt, and loose materials so the reservoir is clean and dry at the time the blocking medium or sealant is applied. 3.If a routed reservoir or crack is left overnight, the reservoir will be re-cleaned immediately before the blocking medium or sealant is applied. 4.The routed asphalt concrete and foreign material resulting from the reservoir preparation will be removed from the roadway surface before an area is opened to traffic. C.Sealing 1.Cracks 3/8 inches or greater in width, which exist below the routed and cleaned reservoir, will be filled with a blocking medium to ensure a nominal sealant depth equal to the width of the reservoir.