EVALUATION STUDIES ON EGGSHELL POWDER AND FLYASH STABILIZED RECLAIMED ASPHALT PAVEMENT AS BASE COURSE

Abstract

Reclaimed Asphalt Pavement (RAP) has been on global research interest in the recent past. A RAP material in pavement base courses has proven to be a viable alternative not only conserve the natural resources but also to reduce the environment pollution and land filling. Previous researchers proved that RAP can be successfully used in various pavement layers. The current study presents the results of a laboratory evaluation of Fly-ash stabilized RAP and RAP-Virgin aggregate blends as base material. OMC, MDD and CBR tests were conducted on the following on the following RAP/ virgin aggregate mixtures: 100/0, 80/20 and 60/40. To develop a potential base mix, RAP: VA mixes stabilized with Eggshell powder stabilized Fly- ash was considered. Results indicate that eggshell powder stabilized Fly-ash is proposed to increase the Maximum Dry density (MDD) and CBR of RAP: VA mix. A 100% RAP cannot be used directly in base / sub base layers because RAP material has a very low or limited bonding as the particles are coated with aged bitumen. Resilient Modulus is also calculated from the predicted equation as per IRC. The results indicate that the RAP which is used for this study is not recommended for high volume road