AASHTO PP 94:2018 Standard Specification for Determination of Optimum Asphalt Content of Cold Recycled Mixture with Foamed Asphalt.
reclaimed asphalt pavement (RA P)—removed and/or processed pavement materi at s containing asphalt binder and aggregate.
3.2. cold in-place recycling (C1R)—the on-site recycling process in which the existing asphalt pavement is recycled using a specialized train equipment (tanker trucks, cold planing machines, crushing/screening or sizing units, mixers, payers, and compaction rollers). The CIR process uses 100 percent of the on-site generated RAP, and a foamed asphalt with or without a combination of additives (e.g., lime, cement. and aggregate) to produce CIR mixture, and typically treats an asphalt pavement with a depth of 75 to 100mm (3 to 4 in.). The CIR mixture is used as a base layer overlaid with a surface treatment or asphalt overlay.
3.3. cold central-plant recycling (CCPR)—the process in which the asphalt recycling takes place at a central location using a stationary cold mix plant. The stationary plant could be a specifically designed plant or a CIR train minus the cold planing machine set up in a stationary configuration.
The CCPR mixture is used as a base layer overlaid with a surface treatment or asphalt overlay.
Note 1—Take cores using a pattern that results in a representative sample of the pavement to he recycled, including at or near lane lines, within and between wheel paths. at the pavement edge, and within shoulders if shoulders are to be recycled. Provide at least 180 kg (400 Ibs) of RAP per design. or more if asphalt content or binder properties or recovered aggregate gradation analysis of the RAP are desired.
6.1 .2. Crush cores at ambient temperature or colder to obtain materials for the mix design.
Note 2—A jaw crusher, laboratory milling machine, or other suitable method is recommended for modeling the particle shape and gradation expected during recycling.
6.1 .3. As an ahernative to obtaining and crushing cores, obtain RAP by milling. Mill the pavement from areas to be recycled to the specified depth.
Note 3—Consider using a cold planer (milling machine) to obtain a RAP sample if the pavement section is uniform and a representative section can be milled. If the existing pavement changes within the limits of the project, obtain separate samples for each area and prepare separate mix designs for each sample.AASHTO PP 94 pdf download.