A study of Optimum asphalt content in Warm-mix asphalt concrete with Reclaimed asphalt pavement

Abstract

This research aims to determine the optimum asphalt content (OAC) for mixed virgin materials with reclaimed asphalt pavement (RAP) as the key parameter to be used for pavement design. The results of this research showed that OAC increases when reducing the mixing temperature. It is well known that the viscosity of asphaltic cement (AC) increases when the temperature is reduced resulting in the adhesion efficiency between AC and the aggregates decreasing which induces the OAC value to increase. Besides, the density and Marshall Quotient can be improved by increasing the RAP added. On the other hand, VMA, VFA and stability were reduced with increasing the amount of RAP. The range of the RAP that had higher stability is 20% to 35%, and then the range of the optimum asphalt content is 4.5% to 5%