الفهرس 
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Abstract
The main purpose of this research was to evaluate the effect of addition of two different types of polymers (high- density polyethylene and styrene rubber) on improving rutting characteristics of asphalt concrete pavement.
High density polyethylene particles and styrene butadiene rubber
were added to asphalt cement and the blend was located at predetermined temperature for a specified time till exhibiting complete reaction and then the blend was used as a binder in asphalt mixes.
Marshall lest, static creep test and wheel tracking test were performed on both control and polymer mixes to evaluate its performance. Polymer types and percentages (by asphalt weight) were the variables used in Marshall, static creep and wheel tracking test.
It was found that the addition of either high density polyethylene or styrene butadiene rubber at designed percent (1.0 .2.0 ,4.0 and 8.0%) for H.D.P.E. mix and (0.2, 0.5, 0.7 and 1.0%) for S.B.R mix to asphalt concrete mixes caused an appreciable reduction in rutting depth, and created higher resistance to rutting and deformation as well as higher stiffness when compared with control mix. The level of improvement varied with high-density polyethylene and styrene butadiene percents.
In case of high-density polyethylene, the optimum improvement was achieved at 4.0 % H.D.P.E by asphalt weight while for styrene butadiene mix the optimum improvements was reached at only 0.5% S.B.R by asphalt weight.