How are asphalt emulsions used in recycling applications?
Cold in-place recycling (CIR) and Full-depth reclamation (FDR) are two of the most common applications that use asphalt emulsion as the binder that mix with the pulverized and reclaimed old pavement to create a new level base course.
What is the difference between Cold in-place recycling and Full-depth reclamation?
Cold in-place recycling pulverizes the existing pavement to a depth of 50 to 100 mm (2 to 4 inches). Full-depth reclamation pulverizes to a greater depth below the existing pavement into the underlying material to produce a stabilized base course.
What are the advantages of recycling?
Energy is conserved as the construction is completed in-place/on-grade and no fuel is required for heating. Reflective cracking can be reduced with CIR and eliminated by FDR. Additionally, the pavement crown and cross slope can be restored and loss of curb height is reduced or eliminated.
What type of asphalt emulsions are used in these recycling processes?
Typically, cationic or anionic medium-setting grades, high-float medium-setting grades, and cationic slow setting grades are used. Polymer modified versions of these grades are also used.
After a pavement has been recycled, is a wearing course required to waterproof the recycled pavement?
Depending on the traffic volume a variety of surface treatments such as chip seals or slurry seals may be applied. For high volume traffic roadways hot-mix asphalt is often applied.
Where can I learn more about recycling and reclaiming asphalt pavements?
You can learn more about recycling and reclaiming by logging on to the Asphalt Recycling and Reclaiming Association web site at arra.org
Where else can I learn more about recycling with asphalt emulsion?
You can order AEMA’s Basic Asphalt Emulsion CD-Rom right here on this web site – just click here.