Chemical characterisation of bitumen type and ageing state based on FTIR spectroscopy and discriminant analysis integrated with variable selection methods

Chemical characterisation of bitumen type and ageing state based on FTIR spectroscopy and discriminant analysis integrated with variable selection methods

Ma, L. (TU Delft Pavement Engineering)
Varveri, Aikaterini (TU Delft Pavement Engineering)
Jing, R. (TU Delft Pavement Engineering)
Erkens, S. (TU Delft Pavement Engineering)

2023

The chemical characterization of bitumen type and ageing state are fundamental in determining structural and mechanical properties of bitumen. This work aims to classify various bitumen types at different ageing states and to identify the primary chemical differences relevant to the classification. Fourier transform infrared (FTIR) spectral data of eight bitumen types at five ageing states were analyzed using a chemometric procedure that incorporates principal component analysis (PCA), linear discriminant analysis (LDA) models, variable selection methods. The models presented results of high accuracy in differentiating bitumen type and ageing state. The results show that the spectral regions that describe the aliphatic and aromatic bonds are critical to the identification of bitumen types. The chemical changes due to bitumen ageing are mainly revealed at the region of 1800–900 cm-1. This chemometric method is instructive for the characterization of chemical bitumen properties.

ageing
Bitumen
FTIR
multivariate analysis
source
variable selection

http://resolver.tudelft.nl/uuid:bc61d8e7-de4d-4ef3-ae9c-37a556fd71d1

https://doi.org/10.1080/14680629.2023.2181008

1468-0629

Road Materials and Pavement Design, 24 (S1), 506-520

Institutional Repository

journal article

© 2023 L. Ma, Aikaterini Varveri, R. Jing, S. Erkens