Cold-in-Place (CIR) recycling is a method of removing and reusing the existing asphalt surface. It involves grinding off the top 2 to 5 inches of the existing asphalt surface and mixing the crushed asphalt with an asphalt recycling agent, and placing it back down with a paver. Sometimes an additional module is included crushing this material and screening it to a specific size. Often specific sized aggregate is added to correct the deficiencies found in the existing asphalt material. Asphalt deficiencies are determined by sampling and testing the existing asphalt material prior to beginning the process.
The cold-in-place process is typically performed using a “train” of equipment which includes an emulsion tanker, milling machine, sometimes a crusher and a screen, and an asphalt paver and a combination of pneumatic and vibratory rollers. Because of the length of the train this process can be difficult on tight, windy and narrow streets.