Assessment of aging state of bitumen based on peak-area evaluation in infrared spectroscopy: Influence of data processing and modeling. (4th April 2022)

• Record Type: Journal Article
• Authors: Wieser, M.; Traxl, R.; Unterberger, S.H.; Lackner, R.
• Is Part Of: Construction & building materials. Volume 326(2022)
• Publication Date: 2022-04-04
• Subjects: Bitumen -- Aging -- Carboxyl Peak -- Modeling -- Pre-processing -- Infrared Spectroscopy; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.126798
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: Six different bitumen were aged for 3–4 durations at four different temperatures. The influence of IR-spectrum pre-processing on peak area determination was studied. Peak integration methods have a significant impact on apparent peak-area growth. A model to determine the aging state in respect to the aging potential is proposed. Abstract: The presented study aims at an improved analysis of aging of bitumen based on the carboxyl peak. In general, infrared (IR) spectra are post-processed, including baseline correction and normalization. Moreover, the carboxyl-peak area determination method varies, strongly impacting the results. In this paper, different post-processing steps and peak-area evaluations are systematically studied, providing insights into the robustness and repeatability of these methods. The peak-area serves as input for a proposed kinetic model of aging at a preferably small number of independent parameters. Based on this approach, a model is developed, which determines the bitumen aging state in respect to its overall aging potential.