Cold Central Plant Recycling

What? Asphalt pavements are often being cold planed or milled to maintain roadway geometries or removed prior to an asphalt overlay. This has created large quantities of stockpiled reclaimed asphalt pavement (RAP). RAP is very effective and useful for a variety of pavement maintenance applications. It is often used for the production of maintenance mixtures. This material is cold central plant recycled (CCPR) with an asphalt emulsion in order to rejuvenate it. Besides being very high quality and salvaging pavement materials, RAP mixes result in good cost savings of 25 to 50 percent compared to new mixes.

Why? CCPR provides better process control of recycled materials compared to CIR. Aggregate gradation can be better broken down and additives can be more precisely added to rejuvenate the recycled material. CCPR provides environmental benefits and reduced costs. The consumption of virgin aggregates from dwindling supplies is minimized by using RAP. The cost associated with disposal instead of reuse of RAP has saved tax payers $300 million annually. Additionally, mixtures that include RAP have shown to have equivalent or better long term performance as compared to virgin mixtures.

When? Cold Central Plant Recycling is selected as the strategy of choice when precise process control is required. It may also be required when there is incorporation of RAP from other projects or stock piles or if there is not adequate space at the job site for processing of the recycled materials.

For more details, refer to SECTION 903-2 - COLD-CENTRAL-PLANT RECYCLED ASPHALT CONCRETE PAVEMENT (CCPRACP) of LA County Special Provisions - Section R - Roadway

Sources for more information:
LA County Special Provisions - Section R - Roadway (2015 Edition)