Sasheen Rajkumar provides a global and local view, starting with a definition of RA and the historic context. He goes on to detail the asphalt recycling process, mix types, influencing factors, and issues around quality. What are the environmental and economic benefits and, importantly, the regulations around ownership and disposal of RA?
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There are various mixing plants with different capabilities that can be used for asphalt mixes incorporating RA, as well as recycling batch plants. Herman Marais provides the information you will need. While the same basic types of mixing plants are used, modifications are required, and standard plants should not be used to produce asphalt with high RA content.
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How to design a mix using RA – this paper has it all. Learn about mix selection from types to design considerations, getting the proportioning of new aggregate, new binder and RA right, tests to be conducted on RA samples, and the use of rejuvenators. Wynand Nortje closes off with advice on testing of the recycled asphalt mix.
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Greg Reynolds details all the steps from milling and stockpiling to processing and optimal use of reclaimed asphalt.
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Ensure that the project mix materialises on site by sticking to some basic principles. This presentation enlarges on the basics such as quality control of mixes containing reclaimed asphalt (RA), consistency of RA fractions in the mix, aspects to consider at stockpiles, moisture content, and finally sampling, testing and acceptance control as for conventional asphalt mixes.
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Reclaimed asphalt (RA) is the industry’s answer to environmental sustainability. Here you will gain an understanding of the use of RA from removal to stockpiling of unprocessed RA and avoiding moisture ingress, to crushing, screening and fractioning, stockpiling processed RA, and finally optimising its use.
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