Abstract :
Flexible pavements are commonly used in the world. The durable performance of flexible pavement is a very important
factor that is being considered. Due to the large traffic loads, certain difficulties develop because flexible pavements
undergo specific deformations. In developing countries such as Pakistan, where there is an economic problem, some
special corrective measures are required to improve the performance of Hot Mix Asphalt (HMA). The performance
of the HMA and its internal properties can be improved through the use of mineral waste fillers to save pavement
construction. In this study, the performance of HMA was investigated using different mineral fillers. The type of
minerals, used to verify the performance of HMA, was Stone Dust (SD), Brick Dust (BD) and Fly Ash (FA). The
Marshall Mix Design criteria (ASTM D1559) were adopted to investigate the volumetric properties of HMA. In
addition, the optimal amount of each mineral load was determined using the Marshall Mix design. The prepared
conventional samples were compared with the modified filler samples. The modification of AMF using mineral load
was made by varying the percentages of fines from 5% to 9% with an increase of 0.5% in each sample of the
mineral load. However, the general modification was made by the weight of the aggregates present in the total
mixture. The bitumen used was grade 60/70, taken from Attock Refinery Limited Pakistan. The use of 7% of FA
showed the best results and the improvement of 31.60% of instability and against this stability, vertical deformation
of 4.50 (mm) was observed. The results also showed that using 5% or less of mineral fillers have adverse effects on
stability. This study highlighted the effect of mineral fillers to achieve a strong, durable resistance and the ability
to withstand certain discomforts related to temperature and moisture load. Therefore, it can be concluded that the
lasting performance of HMA is possible using mineral fillers.
Keyword :
Brick Dust, Fly Ash, Flow, Hot Mix Asphalt, Mineral Fillers, Marshall Mix Design, Stone Dust, Stability.