for Highway Construction Page 296 of 71 5 SECTION 431 – COLD MILLING
431.01 Description.
Remove existing seal coat and plant mix pavement by cold milling to the widths and depths as specified or as directed. Transverse wedge milling will consist of cold milling a transverse wedge for the purpose of matching the profile grade of the wearing course to the lip of the gutter elevations.
431.02 Materials.
Not specified.
431.03 Construction Requirements.
Cold mill the pavement surface to the specified depths using sensing devices to control the depth and smoothness. Do not damage the bridge deck or approach slab and do not leave excess pavement in place. Taper cut ends to construct a ramp of 100H:1V slope. The ramp will consist of in -place, un- milled pavement . Square up the tapered area and mill to the specified depth and width before placing the new plant mix pavement. When milling operations create a situation where water cannot drain transversely off the roadway, create relief cuts or other approved methods to provide drainage. Sweep all loose material with pickup brooms. Prevent cold- mill tailings from being spilled or swept onto any lane used by traffic. Some handwork may be required at certain locations (e.g., manholes, inlets, valve boxes, meter boxes, street monuments ). Mill a consistent straight line to the Engineer’s satisfaction. Provide a power -operated, self -propelled milling machine that is capable of automatically and accurately establishing profile grades along each edge of the machine within 0.01 foot (vertical) by reference from the existing pavement by means of a 20- foot minimum ski or from an independent grade control. The equipment will be controlled by an automatic system for controlling depth and cross -section at a given cross slope rate. A 10 -foot ski for cold- milling profile grade control may be used, if approved. A 10- foot ski for cold- milling profile grade control is not allowed on bridge deck areas. Use a mill with a tooth spacing of 5/8 inch or less. The surface texture depth will not be greater than 0.6 inch. The Contractor will use a fine head mill with tooth spacing of 1/4 inch or less for all milling on bridge deck s or areas where traffic will be driving over the surface for more than 3 days. Provide a machine capable of controlling dust and other particulate matter created by the mill cutting act ion. Do not use a heating device to soften the pavement . The texture produced by cold milling will be a grid pattern with uniform striations or other patterns that will provide optimum conditions for placement of plant mix pavement . Construct a 100- foot long test section showing the machine is capable of meeting these requirements. for Highway Construction Page 297 of 71 5 Do not stockpile or dispose of cold- mill tailings on the project site. The cold- mill tailings are the Contractor’s property unless otherwise specified.
431.04 Method of Measure ment.
The Engineer will measure acceptabl y completed work by the square yard. Measurement will be from the cold-milled area, regardless of the depth or number of passes required to achieve depth and width.
431.05 Basis of Payment .
The Department will pay for accepted quantities as follows: Pay Item Pay Unit Cold Milling ............................................................................................. SY A separate payment will not be made for repair of damage caused by cold -milling operations to structures , guardrail , landscaping, or other features. A separate payment will not be made for brooming, loading, hauling, designated use of, or stockpiling of cold- milled materials. for Highway Construction Page 298 of 715 SECTION 500 – STRUCTURES