PERFORMANCE EVALUATION OF RECYCLED ASPHALT WITH FLY ASH IN ASPHALTIC CONCRETE PRODUCTION.

The use of waste materials in the construction and maintenance of roads is increasing at an alarming rate. Reclaimed asphalt pavement (RAP), a recyclable aggregate produced during the demolition of old flexible pavements and fly ash are examples of industrial wastes. This study examined the suitability of RAP in the production of asphalt concrete to replace natural aggregate partially, and modified with Fly ash. The optimum bitumen content (OBC) 6% was used for the asphalt mix designed. The properties of natural aggregates and RAP were determined. Fly ash was subjected to X -- Ray Fluorescence Energy Dispersive Analysis (X--RF) to know its chemical composition, and assessed for the suitability of all the component materials for their use in asphalt concrete. The best performance asphalt concrete with RAP was thereafter treated with 4% fly ash (class f), and Indirect Tensile Strength test was conducted on this sample to know the damage effect on asphalt concrete inform of fatigue cracks and rutting due to traffic load, and its performance resistance to moisture damage. The results of this study showed that asphalt concrete properties can be best improved with the use of 40% RAP content modified by 4% fly ash. [ABSTRACT FROM AUTHOR]