Section 413 — Asphalt Pavement Milling

Description

413.01This work consists of removing asphalt pavement and base by a cold milling process.

Construction Requirements

413.02Equipment.

(a)Milling machine. Provide a milling machine conforming to the following:

(1)Self-propelled;

(2)Sufficient power, traction, and stability to remov e the required pavement thickness and to accurately maintain depth of cut;

(3)Automatic system to control grade elevations by referencing from the existing pavement with a ski, matching shoe, or from an independent grade control;

(4)Automatic system to maintain profile and cross slope;

(5)System to effectively limit dust and other particulate matter from escaping removal operations;

(6)Loading system or adequate support equipment to completely recover milled material at removal rate; and

(7)Cutting width equal to at least one- third of the lane width.

(b)Micro milling machine. When required, provide a micro milling machine conforming to the following:

(1)Conforms to the requirements of Subsection 413.02(a) ;

(2)Cutting drum with ¼ inch or less impact spacing between teeth; and

(3)Machine elevation control accurate to within ⅟ 16 inch.

(c)Sweeper. Provide a sweeper conforming to the following:

(1)Self-propelled;

(2)Vertical broom pressure control; and

(3)Vacuuming system to remove and collect debris and water.

413.03G eneral. Uniformly mill using a longitudinal reference to accurately guide the machine (such as a curb, edge of pavement, or string attached to the pavement surface). Mill the transverse slope to within ¼ inch in 10 feet of the required slope. Transition from one transverse slope to another at a uniform rate. Uniformly mill the entire roadway lane width so the cross -section of the new surface forms a straight line. Transition between different depths of cut at a uniform rate of ½ inch of depth per 10 feet . At the start and end of the milling work, construct a smooth transition to the original surface at this rate. Do not leave an exposed vertical edge perpendicular to the direction of travel. If the pavement remains open to traffic, limit differences in elevation between adjacent lanes to less than 3 inches or sign with “ Uneven Lanes” warning signs and provide a 1V:3H fillet. Use a sweeper immediately behind the milling operations to remove and recover loose material. Minimize the escape of dust into the ai r by misting. Dispose of recovered milled material according to Subsection 203.07 unless required for use in Section 309 or 315. Measure the milled surface using a 10 -foot metal straightedge at right angles and parallel to the centerline. Defective areas are deviations between the surface and the bottom of the straightedge more than ¼ inch measured between two contacts of the straightedge or deviation s more than ¼ inch measured at the end of the straightedge. Submit a proposal to correct defective areas for approval. Before opening to traffic, patch defects in milled surface as approved. 413.04 Micro milling. Limit travel speed to two -thirds of the cu tting drum rotation speed.

413.05Acceptance. Asphalt pavement milling will be evaluated under Subsections 106.02 and 106.04.

Measurement

413.06Measure the Section 413 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: When measuring asphalt pavement milling by the square yard, measure the length horizontally along the centerline of the roadway.

Payment

413.07The accepted quantities will be paid at the contract price per unit of measurement for the Section 413 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 .