Abstract
The purpose of this study is to determine which utilisation of recycled asphalt pavement (RAP) in various roadway applications is the most cost efficient. Using a method developed by the National Asphalt Pavement Association, a system was devised to assess the costs and benefits of using RAP in hot plant mix. A similar process was developed to evaluate the value of using RAP in gravel roads and bases. The system normalises all of the costs and benefits into savings per tonne of RAP as a means of equal comparison. Factors such as savings from dust loss, layer coefficients, haul and decreased need of virgin aggregates were taken into account. Finally, a case study was conducted using these three different applications. Such analysis can be used by other agencies interested in identifying the most cost-effective methods for using RAP in roadway construction.
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