What is a Heater-Scarifier?

A heater-scarifier, used to loosen and heat the existing asphalt surface, is one technique of hot in-place recycling of asphalt concrete. This pretreatment improves the quality of the overlay. More details can be found at the websites listed below.

heater-scarifier
Photo courtesy of Highway Rehab Corporation

A few points to remember if using hot in-place recycling with a heater-scarifier:

Remember, the base and subgrade are not improved. If there is an underlying problem in-place recycling is not the correct technique. Total reconstruction or full depth reclamation may be better techniques. You may be able to box out a few bad spots before recycling a much longer stretch.

References

Asphalt Emulsion Manufacturers Association

National Center for Pavement Preservation

Highway Rehab Corporation (www.highwayrehab.com)

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.