An Assessment on the Physical and Rheological Properties of Asphalt Binder Modified with Micro Bauxite Powder (MBP)

Abstract

This investigation delved into the effect of micro bauxite powder (MBP) on the physical and rheological characteristics of asphalt binder. A high-shear mixer set at 4000 rpm was used to blend three varying percentages of MBP (3, 5 and 7% by weight of asphalt binder) with the asphalt binder. The base asphalt binder was left devoid of MBP. The physical properties of the asphalt binder merged with MBP were assessed through standard tests (to ascertain penetration, ductility and the softening point), and its rheological properties were gauged by means of a dynamic shear rheometer (DSR). While the standard tests revealed that the physical properties of the asphalt binder were improved by the MPB modifier, the DSR outcomes disclosed an upgrading in its (G*) and (δ) values at raised temperatures. These are indications that the viscoelastic features of the asphalt binders were enhanced by the modification. In comparison to the base asphalt binder, the modified binders exhibited an elevated degree of elasticity, stiffness and resistance against rutting deformation. Thus, the modification of asphalt binders using MBP can serve to improve the performance of pavements.