الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 125 |  |  |
| | | from | 125 | | |
Abstract
Rice husk ash (RHA) is a by- product generated from burning the rice ash.
As known, burning rice husk is one of the most environmental problems
in Egypt. It has negative effects on human health and life. Burning rice
husk is the main cause of what is called ”black cloud”, which has
negative influences on the environment and human health.
Thus, in this study, RHA was used in asphalt mixes as a replacement of
mineral filler to reduce limestone dust (LSD) consumption and improve
the engineering properties of Hot Mix Asphalt (HMA). The main aim of
replacing mineral filler is enhancing the performance of asphalt mixes
and producing an economical asphalt mix. For this purpose, five different
mixes were prepared. These mixes are, the control mix which has 0%
RHA, while the other modified mixes contain 25, 50, 75 and 100% RHA
as a percentage of the filler weight. Optimum bitumen content (OBC)
was determined using Marshall test, also all Marshall parameters
(Stability, Air Voids, Voids in Mineral Aggregate, Unit Weight and
Flow) were examined. Indirect Tensile Strength Test (IDT) and Wheel
Tracking Test (WTT) were conducted and their results were analyzed.
Dynamic modulus (│E*│) is considered an important parameter used in
mechanistic-empirical pavement design. The │E*|is measured at
different temperature/frequency combinations. Dynamic modulus
(│E*│) and phase angle (δ) are used for the visco- elastic
characterization of HMA. Thus, these properties were measured for
mixes with and without RHA. The results indicate that RHA has the
potential to be used as partial substitution of LSD mineral filler in