2-72 SECTION 210 – MILLING
210.01 DESCRIPTION . This work shall consist of the removal, disposal, and clean -up of bituminous
pavements by coarse -milling or fine -milling.
210.02 Equipment and Operation .
a.General Requirements . Milling equipment shall be power -driven, self -propelled, and of a size and shape to allow traffic safe passage through areas adjacent to the work. The equipment shall have grade and slope controls capable of operating from a ski and based on mechanical or sonic operation. The equipment shall have a positive means for controlling cross sl ope elevations. The equipment shall have sufficient weight to perform milling without lifting, and sufficient and positive down pressure on the drum assembly at all times when milling. The equipment shall also have conveyors capable of side or front loadin g to transfer the removed material from the roadway to a truck and an effective means of preventing dust from escaping into the air. The cutting head shall use carbide or polycrystalline diamond (PCD) tipped cutting teeth designed for milling bituminous p avement to close tolerances. The cutting head shall be properly maintained so that the depth of cut is within a tolerance of 1/8 inch throughout the width of the head. The grinding and texturing mandrel shall have multiple wraps of flighting with a weld -on or quick - change block system that accepts carbide or PCD tipped cutting bits. Bituminous surfaces adjacent to objects such as drop inlets and curbs that are inaccessible to milling equipment shall be milled with equipment designed for that purpose.
b.Coarse -Milling Equipment . Equipment used for coarse milling shall have a cutting head with the teeth arranged in a manner such that the final pavement surface will have a center -to-center transverse pattern of 5/8 inch between each strike area . The target difference between ridge and valley (RVD) measurements of the mat surface shall not exceed 5/16 inch. The maximum axial distance between the tips of the teeth shall be 5/8 inch.
c.Fine-Milling Equipment . Equipment used for fine milling shall have a cutting head with the teeth arranged in a manner such that the final pavement surface will have a center -to-center transverse pattern of 3/8 inch between each strike area. The target difference between ridge and valley (RVD) measurements of the mat surface shall not exceed 3/16 inch. The maximum axial distance between the tips of the teeth shall be 3/8 inch. 2-73 210.03 GENERAL CONSTRUCTION REQUIREMENTS . The bituminous surface shall be removed to the depth, width, and cross slope as shown on the Plans. The milling depth shall not vary from the typical cross -section depth by more than 1/8 inch. The milling operation shall produce a uniform surface and maintain a constant cross slope between extre mities in each lane and shoulder. Unless otherwise specified, all milled material, including dust and other material remaining on the milled surface after milling, shall become the property of the Contractor and shall be removed from the roadway immediately and disposed of properly. A Type II power broom shall be used to clean -up the milled surface after coarse -milling. Type II and Type III power brooms shall be used to clean -up the milled surface after fine-milling. The milled surface shall be cl eaned prior to allowing traffic onto the surface. The Contractor shall use caution when milling operations occur on bridge decks. Should any damage occur to the deck or membrane as a result of milling operations the Engineer will contact the Construction Structures Engineer to provide an assessment of the damage and recommend any necessary repairs. All damage determined to be the fault of the Contractor shall be repaired by the Contractor at no cost to the state. When traffic shall be maintained for any period of time on a milled area, the following conditions apply:
a.All butt joints 3/4 -inch deep or greater shall have a temporary taper or wedge of bituminous concrete pavement installed with slope of 1:30 (V:H) or flatter . Tapers or wedges shall be in place prior to allowing traffic on the butt joint. Longitudinal edges 2 inches in depth or greater and located at ramp areas shall be tapered a minimum of 7 feet. Suitable temporary aprons or fillets shall be constructed at side road intersections and dri veways. The Contractor shall be responsible for maintaining and repairing wedges and tapers throughout their use, to the satisfaction of the Engineer. Tapers and wedges shall be totally removed prior to placing permanent pavement at the respective butt joint.
b.The Contractor shall repave any coarse -milled areas within 14 calendar days and any fine-milled areas within 35 calendar days of milling. Should the area remain unpaved for a period longer than specified herein, with the exception of milling ahead of full depth reclamation, no payment whatsoever will be made for the milled areas left exp osed in excess of the 14 calendar day or 35 calendar day period. If the Contractor lays down temporary pavement to avoid the above nonpayment for milling, temporary pavement and subsequent milling shall be at the Contractor’s expense. 2-74 (c) Milled areas susceptible to ponding of water shall be drained by cutting slots through the adjoining non-milled area. The slots shall then be filled with bituminous pavement up to existing grade. All costs of cutting and filling the slots will not be paid for directly but will be considered incidental to the applicable Contract item for milling.
210.04 FINE -MILLING . Fine -milling operations shall be performed as specified on the Plans with each
travel lane being milled full width in a maximum of two passes of t he fine -milling equipment. Substantially all of the pavement surface shall be textured. Extra depth fine -milling of isolated low spots will not be necessary if it requires lowering of the overall profile of the pavement. The accumulated total of excluded a reas shall not exceed 5% of the total area to be milled.
210.05 METHOD OF MEASUREMENT . The quantity of Coarse -Milling, Bituminous Pavement and
Fine-Milling, Bituminous Pavement to be measured for payment will be the number of square yards of surface from which bituminous pavement has been removed.
210.06 BASIS OF PAYMENT . The accepted quantity of Coarse -Milling, Bituminous Pavement and
Fine-Milling, Bituminous Pavement will be paid for at the Contract unit price per square yard. Payment will be full comp ensation for furnishing all labor, tools, and equipment, including the Power Broom, Type II and Power Broom, Type III, necessary to complete the work. All costs associated with installing, maintaining, and removing temporary tapers or wedges will not be paid for directly, but will be considered incidental to the applicable milling Contract item. Payment will be made under: Pay Item Pay Unit 210.1000 Coarse -Milling, Bituminous Pavement ................................ ..................... Square Yard 210.1200 Fine -Milling, Bituminous Pavement ................................ ......................... Square Yard 2-75 SECTIO N 213 – MILLE D RUMBL E STRIPS 213.0 1 DESCRIPTION . This work shall consist of texturing bituminous concrete pavement to construct rumble strips, disposing of waste millings, and cleaning up the pavement. 213.0 2 EQUIPMENT . The equipment for milling rumble strips shall consist of a power operated machine with a rot ary type cutting head of a size that will provide milled depressions to the dimensions as shown on the Plan s. The cutting heads shall have cutting tips arranged to provide a smooth cut. The cutting heads shall be on a suspension independent from that of th e power unit to allow the tool to self-align with the slope, or any irregularities, of the surface being milled. The cutting tool shall be equipped with guides to provide consistent alignment of each cut in relation to the roadway and to provide uniformity and consistency throughout the project . Equipment that tears, distorts, or otherwise damages the pavement adjacent to the milled depressions will not be allowed. 213.0 3 GENERA L CONSTRUCTIO N REQUIREMENTS . Rumble strips shall be milled to the finished dime nsions, locations, and tolerances shown on the Plan s, in accordance with these specification s or as directed by the Engineer. Unless otherwise specified, the milled material shall become the property of the Contractor. All material shall be removed from th e roadway immediately with a Type II power broom and shall become the property of the Contractor. 213.0 4 METHO D OF MEASUREMENT . The quantity of Milled Rumble Strips ; Milled Rumble Strips, Shoulder; Milled Rumble Strips, Sinusoidal Shoulder; Milled Rumble Strips, Centerline; and Milled Rumble Strips, Sinusoidal Centerline to be measured for payment will be the longitudinal length in linear feet of treated surface measured. The measurement will include the non -milled lengths between adjacent strips. Gaps or breaks greater than 10 feet will not be measured for payment. 213.0 5 BASIS OF PAYMENT . The accepted quantity of Milled Rumble Strips ; Milled Rumble Strips, Shoulder; Milled Rumble Strips, Sinusoidal Shoulder; Milled Rumble Strips, Centerline; and M illed Rumble Strips, Sinusoidal Centerline will be paid for at the Contract unit price per linear foot. Payment shall be full compensation for furnishing all labor, tools, and equipment , including the Type II power broom , necessary to complete the work .
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 212–214 of 1,380.