0702 Cold Planing Presentation

Cold Planing Introduction Revolutionized HMA removal, leveling and overlay

preparation Considerable changes over the last 30 years

Definitions Cold Planing

removal of the existing pavement to the desired depth Cold Milling

removal pavement surface using drum-mounted carbide steel cutting bits

Diamond grinding Restore ride Improve friction Not to remove material

Grooving resist hydroplaning

Half Lane Front Loading Planer

A 2 & 12 FT Cutting Drums Typical cold milling equipment

Milling head typically rotates counter to the direction of travel, upcutting the material. Typical speed 6 m/min (20 ft/min) Milling heads as wide as 12 ft - up to 16ft Interchangeable cutting heads Variable widths

Cold Milling Equipment Cold Planing Around Manhole

Purpose and Application

Primary use on HMA Overlay Prep 100% Recycling

Full lane to partial lane width Full depth partial depth to removal Reconstruction Emerging use on PCC

Cold Milling Uses?

Removal of rutting Restoration of curb line Restoration of cross slope Restoration of surface friction Mass removal of HMA Roughened surface for improved bond

Trenching With Cold Planer Distresses Treated by CP Raveling Bleeding Shoulder drop off Rutting Corrugations Shoving

Limitations and Effectiveness

Milled Surface texture is a function of: Carbide bit spacing and condition Depth of cut Rotational speed of head Speed of travel

General Steps of Cold Planing

Reclaiming and sizing Removal Cleaning of the milled surface. Application of traffic control markings Wearing course.

Design Considerations

Resulting surface profile Skid resistance Pavement removal and surface profiling Maintain bridge clearance and curb reveal

Construction Considerations

Pavement to be resurfaced Standard head with normal carbide bits Standard line and grade requirements

Pavement surface to be turned over to traffic Special heads with more carbide bits Smoothness and grade requirements in line with HMA

wearing course

Full Lane Cold Planer Construction Considerations

How will grade be controlled? Ski, string line, laser, other

Will ride quality be measured on the milled surface? Profilograph, profiler, none

Typical Surface Resulting from Cold MillingPoor Milled Surface

Special Multiple Wrap DrumMicro milling or carbide grinding

Standard Fine Drum Drum

Fine Textured Surface

Quest

ions?