Mill & Overlay
Milling is performed to remove the existing asphalt layer to a certain depth (anywhere from 1/2 inch to 4 inches) with the milled material being hauled away and stockpiled to be used in other applications (shoulder material, fill for patches, or recycled into new HMA).
After the pavement is milled, hot mix asphalt (HMA) is applied by a paver to a specified thickness to replace the milled material. This treatment is performed to provide additional structural stability and address issues such as rutting and pavement fatigue.
Full Depth Reclamation (FDR)
This is a simple, quick, and economical process for constructing new stabilized base. The existing roadway is pulverized to a depth of 6 inches to 12 inches which mixes existing asphalt surfaces and base or subbase materials with a stabilizing agent to produce a stabilized base course. Once the base course is graded, compacted, and rolled, new hot mix asphalt or chip seal treatment is applied to provide a new paved surface. This process utilizes specialized equipment but provides an economical solution to address structurally deficient pavements.
This is the most expensive and time consuming process available to treat structurally deficient roads. This method includes removing all existing material (HMA, base and subbase), treating the subgrade with a stabilization agent such as aggregate or chemical modifications, and placing new subbase, base, and asphalt layers. Typically, construction plans are required to complete this type of project.