الفهرس 
Thesis Organization
Results and AnalysisOnly 14 pages are availabe for public view
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Abstract
The commonly used hot asphalt mixtures in Egypt cannot fulfill some performance and environmental requirements.
On the other hand, with the huge increase in the cars production, a numerous amount of waste tires need to be dealt with. Due to environmental aspects, several countries forbid the disposal of waste tires in landfills or just throwing it away like in Egypt. Since 1960 Using crumb rubber modifier (CRM) in hot asphalt mixtures has become a frequent practice in road construction all over the world.
There are two methods of using CRM rubber as an additive to hot asphalt mixtures the wet process and the dry process; the commonly used method is the wet process cause it showed a better fatigue and rutting resistance results comparing to the dry process; on the other hand the wet process requires potential modification to the asphalt mix planet and it is more fuel consuming compared to the dry process.
According to these advantages, this research studies the potential use of crumb rubber as an additive to Egyptian’s conventional mixes The research evaluates the mechanical properties of dense graded asphalt rubberized mixtures manufactured using the dry process method.
The results obtained from these mixtures were compared with the used conventional asphalt mixtures (control mix).
The mechanical properties of all mixtures were evaluated using Marshall Stability and flow, moisture susceptibility, indirect tensile strength, dynamic modulus and flow number.
The results obtained from this research proved that using the crumb rubber as a modifier to hot asphalt mixtures improves its mechanical properties.
It was found that the optimum crumb rubber content was 0.75% of the aggregate weight.
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