Authors:
Taleb Al-Rousan; Ibrahim Asi; Omar Al-Hattamleh; Husam Al-Qablan;
Abstract:
Using Reclaimed Asphalt Pavement (RAP) in asphalt mixes has become a common practice in many countries.
Experience indicated that the recycling of asphalt pavements is very advantageous from different perspectives.
Some of the advantages of utilizing RAP include conservation of asphalt and aggregate resources, conservation
of energy and reduction in life-cycle cost. In spite of that, RAP has never been used in Jordan. In this study, the
suitability of asphalt mixes using RAP was investigated. Two hot asphalt mixes were prepared following
gradations recommended by the Ministry of Public Works and Housing (MPWH/ Jordan). Marshall mix design
procedure was used to determine the optimum asphalt content. The first mix was composed of 100% fresh
aggregate and virgin asphalt and the second mix was composed of 30% RAP and 70% fresh aggregates and
virgin asphalt. Marshal stability, loss of Marshall Stability, water sensitivity, indirect tensile strength, dynamic
creep and fatigue tests were performed on samples of the two mixes. Comparing the results of the conducted
tests indicated that the use of RAP in Hot Mix Asphalt (HMA) was advantageous in all properties measured
except for the fatigue test, where shorter fatigue life was observed. The mix containing RAP showed less
reduction in both loss in stability and loss in indirect tensile strength, improved stripping resistance and better
creep performance than the mixture with fresh aggregates. Therefore, it is preferred to use mixes containing RAP
in highways, where fatigue is not the predominant distress type.
Keywords:
HMA, Recycling, RAP, Fatigue, Rutting, Marshall stability.