Characterization of Nano Clay Modified Asphalt Cement

Abstract

Abstract: In order to enhance the service life of flexible pavements, asphalt binder must be modified. The aim of this research is to compare the physical and mechanical properties of virgin and Nano clay modified asphalt cement. These properties include viscosity values and rutting resistance. Nano clay were incorporated in asphalt binder in various percentages ranging from 3%, 3.5% to 5% of the asphalt weight. The viscosity (Cst) and rutting resistance of the modified asphalt binders were evaluated and compared to an unaltered binder. The addition of Nano clay as a modifier improved the asphalt's properties. The results of the study revealed an increase in viscosity and decrease in binder penetration. Consequently, the viscosity and rutting resistance of the modified asphalts increase with the increase in Nano clay content. While the viscosity and rutting resistance values decrease when the modifier content is increased to 5%. Hence the best improvements in the modified asphalt binders were obtained with 4.5% Nano clay content. Keywords: Organo philic clay, asphalt cement, Hamburg wheel tracker (HWTT), rutting, viscosity, rotational viscometer (RV).