WIRTGEN MILLING MACHINE
A demonstration was held to test the ability of the Wirtgen Milling Machine to improve the riding surface and eliminate the hazardous ponding of water on a 1.7 mile section of the two north-bound lanes of U.S. Route 1, a four lane divided facility south of New Brunswick, New Jersey. The existing lanes had depressions in the wheelpaths of up to 1-1/2 inches and rutting of up to 3/4 inch on the outside lane. The milling machine used was capable of planning off asphalt 12 feet wide and up to 1-1/2 inches deep. The pavement was heated ahead of the operation, but only to about 120 to 150 degrees F. or just high enough to raise the temperature at the cutting surface to approximately 20 degrees over the ambient air temperature. The roadway was milled in two passes, with no material cut from the inside of the passing lane on the first pass to a maximum cut of 3/4 inch between wheel paths. The second pass matched the elevation of the previous milled surface on the inside with maximum cuts of approximately 2 inches on the outside edge which extended 2 feet into the shoulder. The milling machine left a clear uniform vertical edge at the outside limits of the removal area which facilitates forming a smooth joint with the overlay material and left a feathered edge on the passing lane. The speed of the milling machine varies according to the depth of cut and thehardness of aggregate in the asphalt which in this case was traprock (basalt). The equipment progressed at about 30 to 35 feet per minute on the first pass (3-1/2 hours for 1.7 miles) and at 8 to 12 feet per minute on the outside lane. The material was windrowed behind the unit to be picked up, hauled away, and used on another location. The pavement was then swept with broom sweepers, traffic lines were applied, and the entire roadway was open to traffic at the end of each working day. An overaly was provided on this section 5 weeks after the milling operation. Tests conducted with a Mays Ride Meter yielded the following results, before miling 174.8 inches/mile; Milled surface 69.8 inches/mile; After overlay 34.0 inches/mile. The end result of the milling operation is good riding surface which, in this case, was practically undisturbed. There was a slight cracking of some of the aggregate but no tearing of aggregate from the surface, no bleeding, and other problems which cause the surface to be unsuitable for immediate use by traffic. /HRIS/
- Appeared in "Special Reports on: Use of Equipment and Methods of Maintenance".
Washington, DC United States 20590
- Hoelker, E M
- Publication Date: 1975-7
- Features: Photos;
- Pagination: 5 p.
- TRT Terms: Asphalt pavements; Bituminous materials; Heating; Machines; Maintenance equipment; Milling; Pavement maintenance; Pavements; Ponding; Surface course (Pavements); Texture
- Uncontrolled Terms: Milling machines
- Subject Areas: Highways; Hydraulics and Hydrology; Pavements; Vehicles and Equipment;
- Accession Number: 00126300
- Record Type: Publication
- Files: TRIS, USDOT
- Created Date: Oct 18 1975 12:00AM