Laboratory investigation on the properties of asphalt concrete containing reclaimed asphalt pavement and waste cooking oil as recycling agent

Abstract

ABSTRACT In this study different dosages of waste cooking oil (WCO), namely, 5%, 10% and 15% (by the weight of total asphalt) have been added into an asphalt concrete containing 25%, 50% and 75% of reclaimed asphalt pavement (RAP) and the effects on volumetric and Marshall properties, indirect tensile (IDT) strength, creep and fatigue behaviour have been investigated. Results show that air voids and optimum asphalt content of the mixtures decrease with the increase of WCO and RAP content, respectively. The Marshall stability, flow and IDT grow with the increase of RAP content and drop with increasing WCO dosage. The rutting resistance was found to increase with adding RAP, with lower increase for adding 50% RAP than 25% and 75%, and decrease with adding WCO, with lower decrease for adding 10% than adding 5% and 15%. Stress-controlled fatigue tests showed that the fatigue resistance of non-rejuvenated mixtures grows with increasing RAP content, and, in general, the increase of WCO dosage results in the decrease of fatigue life. According to the results of this research, inclusion of, approximately, 4%, 7% and 10% of WCO into the mixtures containing 25%, 50% and 75% of RAP, respectively, results in a mixture with almost similar properties of the control mixture.