"Correlating the Compositional Changes to the Rheological Properties of" by Eslam Deef-Allah and Magdy Abdelrahman
 

Abstract

Assessing the binder performance of thermal characterization is critical for quality control. This is pertinent for recovered binders from mixtures, which may not be in adequate quantities to evaluate their performance, particularly in mixtures containing reclaimed asphalt pavement (RAP). The present study deployed a thermogravimetric analyzer to evaluate compositional changes in recovered binders from RAP-containing mixtures, focusing on thermograph and derivative of thermograph (DTG) characteristics and correlating the results to rheological features. Incorporating RAP in mixtures influenced recovered binders' DTG shapes, reducing low-combusted components (%LCC) and increasing residues (%R). The recovered binder from the zero-RAP-containing mixture showed a 4.36% increase in %LCC and a 1.97% decrease in %R compared to the short-term aged original binder. Binders recovered from RAP-containing mixtures exhibited greater stiffness than the short-term aged original binders. The %LCC dropped from 7.22% to 25.52%, while the %R increased from 20.69% to 33.06%. Uncertainty analyses showed that the DTG area and %R had the least uncertainty and that the %LCC had greater uncertainty. Analysis through regression revealed that DTG area and %R can predict G*/sinδ well, showing a correlation between better thermal stability and binder stiffness. This research puts a number on the correlation between thermal and rheological properties, which helps to improve quality control for binders.

Department(s)

Civil, Architectural and Environmental Engineering

Publication Status

Open Access

Keywords and Phrases

asphaltene; compositional changes; RAP; recovered binders; TGA; thermal decomposition

International Standard Serial Number (ISSN)

2673-8244

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2025 The Authors, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Mar 2025

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