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Effects of Polyphosphoric Acid on Physical, Rheological, and Chemical Properties of Styrene-Butadiene-Styrene (SBS)-Modified Asphalt Binder

Albayati, Amjad H; Al-Kheetan, Mazen J; Al-Ani, Aliaa F; Wang, Yu; Mohammed, Ahmed M; Moudhafar, Mustafa M

 Effects of Polyphosphoric Acid on Physical, Rheological, and Chemical Properties of Styrene-Butadiene-Styrene (SBS)-Modified Asphalt Binder Thumbnail


Authors

Amjad H Albayati

Mazen J Al-Kheetan

Aliaa F Al-Ani

Profile image of Yu Wang

Dr Yu Wang Y.Wang@salford.ac.uk
Associate Professor/Reader

Ahmed M Mohammed

Mustafa M Moudhafar



Abstract

High temperatures combined with heavy traffic load necessitate asphalt binder modification to enhance its performance and durability. This research examines the effects of polyphosphoric acid (PPA) on the physical, rheological, and chemical properties of styrene-butadiene-styrene (SBS)-modified asphalt binders. Asphalt binders were prepared by adding 3% SBS and varying PPA dosages of 0.3%, 0.6%, and 0.9% by weight of asphalt cement. The experiment investigated the physical properties (penetration, softening point, ductility, viscosity, and specific gravity), the rheological properties (the performance grading (PG), multi-stress creep recovery (MSCR), and linear amplitude sweep (LAS)), and the microstructure and chemical composition of the modified asphalt binder. The results demonstrated impressive improvements in rutting resistance and stiffness. Adding 3% SBS and 0.9% PPA increased the rutting factor (G*/sin δ) by 165% and the high-temperature PG from 74.2 °C to 93.6 °C compared to the virgin asphalt binder. However, the optimum fatigue resistance was obtained by adding 0.3% PPA to the SBS asphalt binder. The microstructure and composition analysis revealed that using SBS and PPA together enhanced binder homogeneity and reduced voids. Lastly, an Overall Desirability (OD) analysis suggested the 3% SBS and 0.3% PPA to be the most effectively balanced formulation for the demand of high temperature and heavy traffic conditions. However, further field studies are recommended to validate the results under real-world conditions.

Journal Article Type Article
Acceptance Date Feb 6, 2025
Online Publication Date Feb 9, 2025
Publication Date Feb 9, 2025
Deposit Date Feb 10, 2025
Publicly Available Date Feb 10, 2025
Journal Journal of Composites Science
Electronic ISSN 2504-477X
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 9
Issue 2
Pages 78
DOI https://doi.org/10.3390/jcs9020078
Keywords polyphosphoric acid (PPA); SBS-modified asphalt; rheological properties; MSCR; LAS

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