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Pavement Preservation

Home » Asphalt Contractor » March 2008
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Updated: July 8th, 2008 05:26 PM GMT-05:00

Using RAP in slurry seals

Pavement Recycling Systems Inc. of California adds reclaimed asphalt pavement (RAP) to slurry seals as part of its expanding preservation toolbox.

One of the test areas before using reclaimed asphalt pavement (RAP) instead of virgin aggregate.
One of the test areas before using reclaimed asphalt pavement (RAP) instead of virgin aggregate.
One of the test areas after using reclaimed asphalt pavement (RAP) instead of virgin aggregate.
One of the test areas after using reclaimed asphalt pavement (RAP) instead of virgin aggregate.
On the Key Street test project, crews milled three inches of the old road surface, took the material back to Colton for crushing — blending it with a latex modfied emulsion — and then returned the mix to the road for cold placement.
On the Key Street test project, crews milled three inches of the old road surface, took the material back to Colton for crushing — blending it with a latex modfied emulsion — and then returned the mix to the road for cold placement.
The Colton facility produces three recycled aggregate products: Rap-Seal, ReRAP and ReNew Pavement.
The Colton facility produces three recycled aggregate products: Rap-Seal, ReRAP and ReNew Pavement.
Slurry equipment is used to transport unmixed materials and blend them together in a continuous-flow pugmill. With mixing and spreading accomplished in one continuous operation, treated roads can be reopened to traffic within a few hours.
Slurry equipment is used to transport unmixed materials and blend them together in a continuous-flow pugmill. With mixing and spreading accomplished in one continuous operation, treated roads can be reopened to traffic within a few hours.
Slurry equipment is used to transport unmixed materials and blend them together in a continuous-flow pugmill. With mixing and spreading accomplished in one continuous operation, treated roads can be reopened to traffic within a few hours.

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Greg Udelhofen
By Greg Udelhofen
Editor

Riverside, CA-based Pavement Recycling Systems recently completed two test projects for the City of Colton, located between Riverside and San Bernardino, using reclaimed asphalt pavement (RAP) instead of virgin aggregate in slurry seal applied to the road surface.

Don Matthews, ReNew Pavement Division manager and technical engineer for Pavement Recycling, says the company is a strong proponent of using RAP in road preservation projects and many road agency customers in the company’s Southern California market are beginning to realize the value of using RAP in surface preservation treatments.

“We’ve used RAP chip seals on smaller projects in the past; and we’ve also done some small test projects using RAP in slurry seals, scrub seals and scrub seals with RAP chip applied over the seal,” Matthews says. “And now we’re starting to gain interest with some of the major county road agencies in our market, so I think as we continue to demonstrate the advantages of RAP preservation treatments, more prospective customers will be willing to consider RAP as a cost-effective solution to their preservation needs.”

Testing grounds

RAP aggregates for the two test projects in Colton were supplied by Reclaimed Aggregates Inc., a subsidiary of Pavement Recycling Systems. The Colton aggregate processing facility manufactures aggregate products from recycled materials - asphalt pavements and concrete.

Matthews says the company is currently producing three alternative pavement products - Rap-Seal, a RAP that has been compacted and resealed with a recycling emulsion; ReRAP, a crushed and sized RAP product that has been mixed with an emulsion before being placed and compacted; and ReNew Pavement, a RAP that has been crushed and screened into individual sizes to be blended back into a mix design that meets a specified gradation band. Performance characteristics of ReNew Pavement are comparable to conventional hot mix produced with virgin materials.

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