Experimental Validation of the Dual-Oxidation Routes in Bituminous Binders

Book chapter (2021)

Authors

Georgios Pipintakos Universiteit Antwerpen
H. Y.Vincent Ching Universiteit Antwerpen
Uwe Mühlich Universiteit Antwerpen
Hilde Soenen Nynas NV
Sabine Van Doorslaer Universiteit Antwerpen
Peter Sjövall Research Institutes of Sweden RISE
Aikaterini Varveri Pavement Engineering - CEG
Christophe Vande Velde Universiteit Antwerpen
Xiaohu Lu Nynas AB
Research Group
Pavement Engineering (CEG) (TU Delft)
Copyright: © 2021 Georgios Pipintakos, H. Y.Vincent Ching, Uwe Mühlich, Hilde Soenen, Sabine Van Doorslaer, Peter Sjövall, Aikaterini Varveri, Christophe Vande Velde, Xiaohu Lu
DOI: https://doi.org/10.1007/978-3-030-46455-4_115
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Published Date

2021

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

Oxidative ageing in bituminous materials is considered to be one of the most important factors for distress types in road applications. The increasing interest in oxidative ageing has highlighted the need for a thorough understanding of the oxidation mechanisms at molecular level. This paper offers some insight in the validity of the proposed hypotheses about the oxidation routes of bitumen, the fast- and the slow-rate route, reflecting on previous studies. Fourier-Transform Infrared (FTIR) and Electron Paramagnetic Resonance (EPR) spectroscopy were utilised for this verification. To elucidate the uncertain formation of sulfoxides, an additional surface investigation with Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) was performed. The findings of the aforementioned techniques reveal the existence of the oxidation products reported previously and contribute to the understanding of the oxidation mechanisms. Overall, this research strengthens experimentally the hypotheses of the dual-oxidation routes of bitumen.

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