Asphalt Milling Process
The aim of Asphalt milling is the removal of the surface of any paved area such as road, parking lot or the bridge in order to level the level the surface and smoothen it out. Milling gets rid of a certain thickness of the paved surface, and there are different reason and purposes behind. The controlled removal and recycling of the asphalt layer restore the surface and corrects it for detailed profile. The Asphalt milling process creates recycled asphalt pavement or RAP for use in place of the new asphalt material. The controlled removal depth can range to varying thickness. The process is also referred to as profiling or cold planing.
The main purpose of Asphalt milling
The major aim of the Asphalt milling process is to recycle the road surface. The process is increasingly employed for pavement recycling. The surface of the pavement is removed to the desired depth and ground to be used again and repaved as a new pavement. RAP gets recycled after it gets combined with asphalt cement and the new aggregate. The idea is to lower the impact of resurfacing on the environment. Another purpose behind is to lower the stress from the surface and to create a smoother surface for a better driving experience as well as extend the life of the paved surface.
Asphalt milling can remove any aggregate that gets separated from the binder and lies loosely on the roads. It takes care of Bleeding of the binder and Rutting that results in the formation of low spots on the pavement. It helps to smooth out the uneven road surface causing bumps and sags or the Shoving, which is a washboard like effect that develops in the direction of travel. The process takes care of any damage to the paved surface over the years and improves the ride quality.
Different classes of Asphalt milling
There are five classes defined for the milling process and recognized by the Federal Highway Administration.
Class I – to eliminate irregularities of the surface
Class II – for an even depth as shown on site plans
Class III – For even surface and addition of cross slope
Class IV – A full depth milling to the base
Class V – Different depths at numerous locations
The advantages of Asphalt Milling
As Asphalt Milling involves the recycling of existing materials, it is a sustainable process that saves natural resources and energy. One can repeat the process over and over again for the same surface. Using RAP means lowering the energy and greenhouse gas emissions and thus curbing the carbon footprint. Surface drainage gets improved, and the existing curb is maintained. Any bumps, ruts and uneven surface irregularities get removed. Along with saving energy and resources, the Asphalt Milling process is economical too. Thus, it is healthy for the environment and for the pocket too!
Asphalt milling process is carried out by construction equipment that comprises of huge machines with a rotating drum that removes and grind the road surface. There are several tool holders scrolls in the drum which are positioned around the drum.