509.01 DESCRIPTION. Remove asphalt concrete surfacing by milling in
accordance with these specifications and in conformity with the average depth, width, grade, cross-slope and typical sections shown on the plans or as established.
509.02 EQUIPMENT. Use an approved self-propelled milling machine or
grinder for milling asphalt surfacing in accordance with 503.12.
509.03 CONSTRUCTION REQUIREMENTS. Pavement surfaces
resulting from milling operations shall be of uniform texture, grade and cross slope and free from loose material. Re-mill surfaces not meeting these requirements at no direct pay. Uneven, undulating surfaces will not be accepted. If ridges are excessive, the engineer may require additional milling, replacement of milling machine teeth, or other corrective action. Limit the maximum depth of milling to 2 inches per day when traffic is being maintained. Maintain a maximum 2-inch depth at milling edge of embankment at all times. Use a minimum length 25 -foot traveling reference plane on the first pass of the milling machine. A shoe device may be used on adjacent passes. When the entire roadway width has not been planed to a flush surface by the end of a work period , resulting in a vertical or near vertical longitudinal face exceeding 2 inches in height, slope this longitudinal face as directed. Place smooth transitions at transverse joints prior to restoring to traffic by milling or by us ing an asphalt concrete mix. Do not use RAP. Transitions shall be a minimum length of one linear foot per 1/4 inch of the milled depth. Make provisions at drives and turnouts to maintain local traffic. Remove asphalt concrete next to structures or in small irregular areas that cannot be removed by the milling machine by other acceptable methods. Provide drainage of milled areas where needed by cutting through the shoulder to the ditch on the same day that adjacent milling is performed. The milling operat ion shall not precede the subsequent paving operation or a shoulder stabilization operation by more than 15 calendar days. If shoulder stabilization has been performed, the paving operation shall commence 7 calendar days after the completion of the should er stabilization operation. Delay in starting the paving operations that causes a further degradation in the milled surface shall be corrected by the contractor by additional milling or providing leveling at no additional pay. Severe raveling or degradati on of the milled surface that occurs shall be reported to the engineer in writing with station locations identified. The engineer will direct corrective action. Place temporary pavement markings prior to opening the roadway to traffic in accordance with Section 713. Haul all reclaimed asphalt pavement (RAP) material to be retained by the Department for its recycling program, or by other government entities to the storage facility indicated on the plans and stockpile as directed. The contractor may also be required to retain a specified percentage or quantity of the RAP generated by the project. Make required joint repairs prior to milling. Complete pavement patching before milling, unless additional areas requiring patching are exposed by the milling. Perform pavement patching and joint repair in accordance with Section 510. The initial face of a butt joint can match the radius of the cold planing milling drum. No true vertical face is required.
509.04 MEASUREMENT. The Department will measure milling by the
square yard of asphalt concrete surfacing satisfactorily removed. No additional measurement will be made for multiple passes required to achieve total milling depth shown on the plans. Measurement of contractor retained RAP will be by the cubic yard, theoretical in-place plan quantity, and will be credited to the Department by treating it as a negative quantity in the Schedule of Pay Items.
509.05 PAYMENT. Payment for milling of asphalt pavement will be
made at the contract unit price per square yard, which includes the costs for removing, hauling and stockpiling of RAP material. The value of the RAP material retained by the contractor will be credited to the Department at the contract unit price for the retained material. Drainage cuts placed through the shoulders, drop off transitions and transitions at transverse joints will be at no additional pay. Payment for temporary pavement markings will be included under appropriate pay items. Payment will be made under: Item No. Pay Item Pay Unit 509-01 Milling Asphalt Pavement Square Yard 509-02 Contractor Retained Reclaimed Asphalt Pavement Cubic Yard
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