Improving the Functional Properties of Asphalt Binder via Triple-Component Polymer Modification: An Analysis of Stability and Rheological Behavior

Taher M. Rasheed; Sherwan M. Simo; Mevan M. Mustafa

doi:10.48084/etasr.14090

Authors

Taher M. Rasheed Department of Chemical Engineering, College of Engineering, University of Duhok Polytechnic, Duhok, Iraq
Sherwan M. Simo Department of Petroleum Engineering, College of Engineering, University of Zakho, Zakho, Iraq | Engineering Researcher Center, University of Zakho, Kurdistan Region, Iraq
Mevan M. Mustafa Department of Petroleum Engineering, College of Engineering, University of Zakho, Zakho, Iraq

Volume: 15 | Issue: 6 | Pages: 29156-29164 | December 2025 | https://doi.org/10.48084/etasr.14090

Received: 15 August 2025 | Revised: 8 September 2025 | Accepted: 27 September 2025 | Online: 8 December 2025

Corresponding author: Mevan M. Mustafa

Abstract

This research explores the improvement of asphalt binder performance through a novel three-component polymer modification that combines Styrene-Butadiene-Styrene (SBS), Ethylene-Vinyl Acetate (EVA), and Dibenzoyl Peroxide (DBP). The study addresses the longstanding issue of phase separation in polymer-modified asphalt, a challenge exacerbated by Iraq's extreme climatic conditions and heavy infrastructure demands. The work focuses on enhancing the rheological, physical, and chemical stability of 40/50 penetration grade asphalt, aiming to strengthen its resistance to aging, deformation, and thermal deterioration. The results reveal that the combined use of SBS, EVA, and DBP produces a strong synergistic effect—boosting elasticity, stiffness, and high-temperature performance while minimizing rutting and fatigue. The most effective and economical blend was determined to be 2.5 wt.% SBS+EVA with 0.3 wt.% DBP. The analytical evaluations, including Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-ray Spectroscopy (EDX), confirmed successful chemical interaction among the additives, resulting in a more uniform polymer-asphalt structure. This method offers a promising solution for creating long-lasting, sustainable asphalt binders that can withstand heavy traffic and harsh environmental stresses.

Keywords:

polymer-modified asphalt, rheological properties, phase stability, Styrene-Butadiene-Styrene, Ethylene-Vinyl Acetate, Dibenzoyl Peroxide

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