Asphalt Milling & Removal
Asphalt milling is the controlled removal of existing asphalt pavement. Removal depth can range from the surface layer to the base course. Milling is a process that corrects and restores the original grade and smooths the surface for new asphalt resurfacing. Another term for asphalt milling is cold planning or profiling.
Asphalt milling is done using a milling machine. The first production milling machines were called Galions because Galion Iron Works manufactured them. They now come in various sizes to handle jobs both big and small. Some of the larger machines can cut close to 15,000 square yards or 13,000 square meters a day, at 75ft/minute. Our milling machines have 3 basic components that also breakdown the 3 phases of this process; Cutting Drum, Vaccume, Conveyre Belt.
First the cutting drum rotates, cutting heads across the surface, chewing up the existing asphalt to the depth of the cutting heads. Then the vacuum sucks up all the milled material and deposits it where the conveyer belt that then moves everything into a dump truck. The dump truck and the milling machine move together so the material is collected as it is removed from the surface, saving a lot of the time and effort that would be needed to collected later. The milled asphalt can be recycled and reused in future paving projects.
Once the milling machine has removed the asphalt to the desired width and depth, the surface is swept and cleaned. This removes dust and debris that might cause problems with the new asphalt bonding to the surface. After the area is cleaned, the bond between the old and new asphalt should be very good, particularly as the old asphalt has a rough surface from the milling that will bond to the new ashpalt better.
Proper milling allows new layers of asphalt to be laid evenly and at the same depth as the old surface, ensuring other structures like curbs and drainage ditches are not negatively affected. It also allows for the easy collection of old asphalt to be recycled for new applications.