Synthesis of standards and procedures for specimen preparation and in-field evaluation of cold-recycled asphalt mixtures

Abstract

The use of recycled asphalt (RA) materials in pavement rehabilitation processes is continuously increasing as recycling techniques, such as cold recycling (CR), are being utilised in increasing magnitude and greater awareness for use of recycled materials and consideration of sustainable practices is becoming common in the construction industry. The focus of this paper is on developing a state of the art and state of the practice summary of processes used for classification of RA as well as the curing and specimen preparation practices for cold-recycled asphalt mixtures. A variety of topics were explored through an exhaustive literature search, these include RA production methods, definition of RA materials, stockpiling practices, industrial operations, specimen curing and preparation practices and in-field evaluation of cold-recycled rehabilitation. This paper was developed through efforts of CR task group (TG6) of RILEM Technical Committee on Testing and Characterization of Sustainable Innovative Bituminous Materials and Systems (TC-237 SIB).

Keywords:

• recycled asphalt
• cold-recycling
• RAP
• specimen preparation
• material characterisation

Notes

1. content at maximum dry density in specimens composed of RAP, water and emulsion or foam bitumen.

2. fluid content (i.e. foam bitumen) at maximum dry density in specimens composed of RAP, water and emulsion or foam bitumen.