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 in
axle loads) in addition to the unprecedented rise of temperature in the summer has
increased the risk of permanent deformation of flexible pavement (Rutting) in recent
times. Lower costs maintenance and extending serves life of flexible pavements are the
main objectives of this study by improving rut resisting of it using the waste locally
available materials (Dates Kernel Powder).
The Superpave design criteria is used to determine optimum asphalt content at 4% air
voids for hot mix with Lime Stone Dust and Dates Kernel Powder as a filler materials to
three types of aggregate blend. Preparing 54 samples with dimension (400*300*50) mm
at 110?C compacted temperature to test it by Wheel-Tracking device at 40?C, 50?C and
60?C. Based on wheel-tracking device results, it can be show that there was a significant
decrease in the value of the Rut Depth when using the Dates Kernel Powder as an
alternative to Lime Stone Dust as a filler materials in Hot Mix Asphalt and it can be used
to improve the rut resisting; the maximum percent of reduction is 67.71 after 3000 cycle
of passing at 60ºC and 49.35 as a minimum percent of reduction after 5000 cycle at 40ºC
tested temperature, then it can be seen that the impact of Hot Mix Asphalt with Dates
Kernel Powder is less at high temperatures than mixes with Lime Stone Dust on Rut
Depth value.