الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
During last decade, researchers’ interest in nanotechnology applications, particularly in the field of pavement materials, has been increasing. In the last three years, a peak in the curve of interest has evolved. Improvement in flexible pavement performance has been found when a certain percentage of some nanomodifier is applied to the liquid asphalt binder. This research work focused on the investigation of the properties of asphalt binder modified with different percentages of two different nanomaterials. These materials were nanoclay (NC) and nanosilica. The nanosilica was manufactured from two different sources: silica fume and rice husk. All of the three materials were produced locally in Egypt. Nanomaterials and a base asphalt binder were first characterized in the laboratory. A mechanical mixer was then used at 1500 rpm and temperature of 145±5°C to mix the nanomaterials with the binder for different times ranging from 5 minutes up to 75 minutes. The required mixing time was then determined. Three different percentages (3%, 5% and 7% by weight of asphalt binder) of each of the investigated nanomaterials were mixed with the binder. The modified binders were tested for conventional and rheological properties. Results showed that, nanosilica synthesized from silica fume (NSF) tends to decrease the penetration value and increase the softening point temperature. NC on the other hand was found to increase the penetration and decrease the softening point temperature. At temperatures of 135°C and up to 150°C, increasing NSF percentage was.