Comparing Effects of Conventional and Novel Filler on Mechanical Properties of Asphalt Mixtures

This study focuses on determining the engineering characteristics of asphalt concrete using fillers with different physical and chemical interactions properties. Mineral and Portland cement as the common fillers and nano clay and precipitated calcium carbonate (PCC) as the novel fillers. Mechanical properties that were investigated are marshall stability, flow, indirect tensile strength, resilient modulus, dynamic creep and indirect tensile fatigue. More than 200 sample were be made in size of Marshall Sample with different filler/asphalt ratio. The results show that fillers properties such as surface area have the most effect on mechanical properties of aspartic mixtures. By increasing in filler content penetration and ductility reduce and softening point increase. Silica filler have more strength under static loading but strength under cyclic loading reduces. Nano clay can improve creep behavior but fatigue life reduces. PCC have the most effect to increase fatigue life.