Abstract
Recycled asphalt pavements (RAP) and recycled concrete pavements (RCP) were evaluated for use as an unbound base/subbase material. The objective was to recommend procedures for performance-related testing and selection of recycled hot-mix asphalt (HMA) and Portland cement concrete (PCC) materials for use as aggregates in unbound pavement layers, singularly or in combination with other materials. Performance-related tests were conducted on RAP and RCP samples containing three constituent aggregate types (gravel, crushed limestone and granite) providing a range of performance from poor to excellent. The recycled materials were blended with a virgin aggregate known to provide good performance in unbound pavement layers. Requirements for test parameters for recycled materials were established to evaluate recycled materials' suitability for use in particular traffic and climatic conditions. The research results are implemented as a decision chart incorporating aggregate shear strength, stiffness, toughness, and frost susceptibility to provide a measure of the performance potential of a particular recycled aggregate.
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