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 System

Road rehabilitation technology is currently under the global spotlight. Considering that cold bituminous binders, e.g. emulsion and foamed bitumen, have become more commonly used in cold recycling operations, there is a need to understand the performance properties of these materials. Great strides have been made in the modelling of foamed bitumen treated materials in recent years. Performance functions that may be used in the design of pavements incorporating these materials become increasingly important.The challenge of modelling the behaviour of these mixtures is complicated by the variety of foamed mixtures that are produced and the range of mix variables that prevail. Binder content (BC), active filler content, parent rock type, aggregate gradation, plasticity, moisture content, etc. can vary significantly from mix to mix. A unified approach to designing with these materials that accounts for all of these variables is exceptionally challenging.This publication investigates the shear and dynamic properties of foamed bitumen stabilised mixes and their role in the performance modelling of these materials. Latest research findings are synthesized with the relevant aspects of the mix evaluation and classification procedures. Correlation of different testing protocols and mix compositions is made with a view to providing synergy to the research results and direction to their application in mix design and pavement design.

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