IMPROVING RUTTING RESISTANCE OF HOT MIX ASPHALT BY DATES KERNEL POWDER

Abstract

In Iraq, the significant increase in the number of passenger cars and trucks (increased inaxle loads) in addition to the unprecedented rise of temperature in the summer hasincreased the risk of permanent deformation of flexible pavement (Rutting) in recenttimes. Lower costs maintenance and extending serves life of flexible pavements are themain objectives of this study by improving rut resisting of it using the waste locallyavailable materials (Dates Kernel Powder).The Superpave design criteria is used to determine optimum asphalt content at 4% airvoids for hot mix with Lime Stone Dust and Dates Kernel Powder as a filler materials tothree types of aggregate blend. Preparing 54 samples with dimension (400*300*50) mmat 110˚C compacted temperature to test it by Wheel-Tracking device at 40˚C, 50˚C and60˚C. Based on wheel-tracking device results, it can be show that there was a significantdecrease in the value of the Rut Depth when using the Dates Kernel Powder as analternative to Lime Stone Dust as a filler materials in Hot Mix Asphalt and it can be usedto improve the rut resisting; the maximum percent of reduction is 67.71 after 3000 cycleof passing at 60ºC and 49.35 as a minimum percent of reduction after 5000 cycle at 40ºCtested temperature, then it can be seen that the impact of Hot Mix Asphalt with DatesKernel Powder is less at high temperatures than mixes with Lime Stone Dust on RutDepth value.