Volume 61, Issue 337, January - April 2025

Detecting the influence of additives on the physical properties of asphalt binder

Saad Issa Sarsam

Professor and Director, Sarsam and Associates Consult Bureau (SACB), former Head, Department of Civil Engineering, College of Engineering, University of Baghdad, Iraq

ABSTRACT

The physical properties of Asphalt cement binder usually decline throughout its service life due to the environmental impact. The asphalt binder will lose the required flexibility, resilience, cohesion, and creep stiffness. Implication of additives can enhance the quality of the binder and extend its useful life. In the present investigation, two types of asphalt cement binder with a penetration grade of (40-50) and (60-70) have been modified by implication of (coal fly ash), and (hydrated lime) additives. The treated binders underwent determination of their physical properties. It was observed that for (60-70) and (40-50) binders, the penetration value declined by (69.7, and 16.6, 5) % and (66, and 22.7) % after implication of coal fly ash, and hydrated lime respectively. The softening point of (40-50) and (60-70) binders increased by (2, and 2) % and (6.2, and 4.1) % after implementation of coal fly ash, and hydrated lime respectively. It was observed that modification of binder with (coal fly ash) exhibits higher stiffness modulus among the control or lime-treated binder regardless of the binder type. For (40-50) and (60-70) binders, the creep stiffness increased by (5, and 32.5) % and (6.2, and 25) % after implication of coal fly ash, and hydrated lime into the binder respectively. It was concluded that modification of asphalt binder with coal fly ash had exhibited the highest stiffness modulus as compared to the control or lime treated binders regardless of the binder type.

Keywords: Asphalt binder, physical properties, penetration, stiffness modulus, additives, creep stiffness

Discovery, 2025, 61, e9d1529

PDF

DOI: https://doi.org/10.54905/disssi.v61i337.e9d1529

Published: 01 March 2025