الفهرس 
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Abstract
An asphalt mix design was prepared using different percentages of
un modified bitumen (4,4.5,5,5,5.5&6),figures below show relation
between different percentage of un modified bitumen and (stability ,flow
,unit weight ,voids mineral aggregate%, air voids%&Stiffness)
from the curves in the below Figure 4-5. the unit weight of mixture
increase with increase of asphalt content to reach the maximum density of
the mixture at 6% asphalt content, the air voids in the mixture with
increase of asphalt content in an inverse relation with density so to satisfy
the limitation air voids of 4% give asphalt content of 5.70% , increase of
stability with increase of asphalt content till percentage of 5.5% asphalt
content and decrease stability of mixture with more asphalt content , more
asphalt content lead to less flow value of the mixture with the optimum
asphalt content of 5.5%
from asphalt mix design figures shown below, the optimum
bitumen content = 5.5%