ABSTRACT

In wearing course of flexible pavement, bitumen is used as a binder of aggregate mixes and its properties affects the quality of the asphalt mixtures. There are several requirements of bitumen which has to fulfill to use in flexible pavement. These requirements are specified for certain uses. Usually the specified properties are needed by the road users or by the road engineer. The properties of bitumen will change with time, temperature and loading conditions, so it is necessary to find out its whereabouts. As the changes of the bitumen properties occur because of chemical reactions taking place within bitumen, researches has been made a research chemical components which are responsible for it. The knowledge on those changes of bitumen is also needed in predicting whether bitumen will change much or less after a certain of service. In this paper a straight run and semi blown bitumen are studied and analyzed physically and chemically before and after a certain time of service. The results are then compared and related to service failure.

Keywords: Bitumen, Chemical, Composition, Pavement