IMPACT OF RECLAIMED ASPHALT PAVEMENT (RAP) ON PROPERTIES OF ASPHALT MIXTURE FOR SURFACE LAYER

Abstract

Using Reclaimed Asphalt Pavement (RAP) not only reduces the cost of new asphalt mixtures but also conserve the natural resources. To incorporate RAP in asphalt mix design, it is vital to know the impact on properties of asphalt mixture. In this research, the effect of different percentage of RAP on performance asphalt mixture in terms of water sensitivity (Indirect Tensile Strength Ratio TSR) and ultrasonic test were studied. The best gradation of aggregate was selected and optimum asphalt content was determined according to Superpave design system. Superpave Gyratory Compactor (SGC) was used to compact asphalt samples with 100-mm diameter. Four different percentages (7, 13, 19 and 25) of RAP were used for preparation mixes to compare with virgin mixture. Two types of asphalt grade were used (40-50) and (60-70), The test results indicated that addition RAP to mixes shows significant increase on resistance of moisture damage (TSR) and modulus of elasticity(E*).