ABSTRACT
ABSTRACT: Asphalt mortar is a kind of dispersion system combined asphalt mastic with fine aggregates. Fine aggregates properties have a significant effect on the viscoelastic properties of asphalt mortar. Effect of fine aggregate form, angularity, and texture on the viscoelastic properties of asphalt mortar were studied in this paper. Image analysis procedures consisting of diploid microscope and surface light source were developed to capture fine aggregate properties. Six indices were measured for 10 aggregate samples to describe these properties. The samples were related to the viscoelastic properties of asphalt mortar measured by DSR. The results showed that the form, angularity and texture of fine aggregate exercise a remarkable influence on instantaneous elasticity, viscous component and low temperature performance of asphalt mortar. Resistance to deformation decreased with a flat, elongated shape and a decrease in aggregate angularity and texture. Abundant angularity and texture are beneficial for an increase of viscous component and low temperature performance.
