Enhancing the Viscoelastic Properties of Asphalt Concrete by Implication of Additives

Abstract

The flexible (Asphalt concrete) pavement usually practices dynamic flexural stresses due to the vehicular traffic throughout its service life. The resistance to such dynamic and heavy stresses may be enhanced by the implication of extra fine size additives into the asphalt concrete mixture as partial substitute of the mineral filler. In the present assessment, an attempt has been made to introduce silica fumes and coal fly ash class F as additives into asphalt concrete mixture for partial replacement of mineral filler. Asphalt concrete mixtures were prepared and compacted into slab mold in the laboratory at optimum binder content of 4.9 % with the aid of roller compaction. Additional slab samples were prepared with 0.5 % asphalt binder lower and higher than the optimum requirement (5.4 and 4.4) %. The optimum percentages of silica fumes and coal  fly ash are (2 and 4) % by weight of the asphalt binder respectively. Beam specimens were extracted from the prepared slab samples of asphalt concrete and subjected to dynamic flexural stresses using the four points bending beam test at three constant microstrain levels of (750, 400, and 250). The resistance of the mixtures to repeated flexural stresses and the changes in the viscoelastic properties in terms of dissipated energy and phase angle were monitored through the elapsed time required for initiation of micro cracks. 

Cite as:

Saad Issa Sarsam. (2024). Enhancing the Viscoelastic Properties of Asphalt Concrete by Implication of Additives. Journal of Advances in Nanotechnology and Its Applications, 6(2), 14–23. 

https://doi.org/10.5281/zenodo.11665915