Abstract

Multiple refineries in Iraq supply asphalt cement. The diverse environmental conditions across the country had prompted the flexible pavement to adapt, resulting in a significant temperature range of -15℃ to over 65℃. The potential for aging in asphalt binders can vary. An attempt has been made in the present investigation to assess the influence of short and long term ageing on temperature susceptibility of asphalt concrete prepared by using dense graded aggregate and three types of asphalt binder obtained from daura, erbil, and nasiriyah refineries located at middle, north and south regions of the country. The physical properties of asphalt cement samples were tested using classical methods, including measuring their stiffness modulus, penetration index, and creep stiffness. Asphalt concrete specimens of 102 mm in diameter and 63.5 mm in height were prepared using the prementioned binders and subjected to temperature susceptibility determination. The specimens were subjected to temperature susceptibility determination. It was concluded that implementation of asphalt binder of the same penetration grade but from varied asphalt sources from (erbil, doura, and nasiriya) have produced different behavior under ageing. Erbil binder exhibit the lowest temperature susceptibility of 50 kpa/°c after long term ageing and highest creep stiffness of 270 mpa after practicing 7 hours ageing among daura and nasiriya binders regardless of ageing periods.