Dossier 21 – Categorisation and analysis of rejuvenators for asphalt recycling

In this dossier, we analyse the different types of products that are either being developed or are already commercially available as a rejuvenator (also called rejuvenating agent) for the reuse or recycling of asphalt pavements.

We propose a categorisation into classes or groups to serve as basis for an analysis to assess the success and risk factors. A number of examples of commercially available products are given for each group.

The categorisation into groups is based primarily on the nature and origin of the product. For each group, we analyse the different rejuvenators, identifying the pros and cons of the various types, while focusing on the following elements:

• origin and production process;
• chemical composition;
• action – working mechanism;
• availability and practical experience;
• health, safety and environment (HSE) and sustainability aspects such as emissions and leaching.

HSE aspects are often closely related. Thus, emissions are evaluated primarily by their impact on the health of those working with the products and those present in the surrounding area, while at the same time their impact on the natural and built environment is evaluated.

Health, safety and environment aspects of the use of these rejuvenators for asphalt recycling are therefore an essential component of the evaluation of asphalt recycling in the broader sustainable development framework.

This evaluation does not discuss the mechanical performance of the products; these aspects are addressed elsewhere, for example in the Re-RACE research project conducted at BRRC. The detailed literature study carried out for that research project also provided useful information for this dossier.