TY - JOUR A1 - Mirwald, Johannes A1 - Khalighi, Sadaf A1 - Varveri, Aikaterini A1 - Hofko, Bernhard A1 - Adwani, Dheeraj A1 - Cannone-Falchetto, Augusto A1 - Elwardany, Michael A1 - Kleiziené, Rita A1 - Konieczna, Katarzyna A1 - Maliszewski, Maciej A1 - Mouillet, Virginie A1 - Nahar, Sayeda A1 - Piérard, Nathalie A1 - Pipintakos, Georgios A1 - Porot, Laurent A1 - Primerano, Kristina A1 - Sharma, Aditi A1 - Tavassoti, Pejoohan A1 - Weigel, Sandra A1 - Wetekam, Jens A1 - Zhu, Jiqing T1 - Evaluating the reproducibility and consistency of different sample preparation techniques used for ATR-FTIR spectroscopy from the RILEM 295-FBB TG1 round robin test N2 - Attenuated Total Reflection Fourier Transform Infrared spectroscopy has become a popular spectroscopic technique in bituminous binder analysis. However, comparable results are not obtainable yet due to differences in devices, measurement routines, sample preparation procedures, and spectral evaluation. Thus, the Task Group 1 of the RILEM TC 295-FBB: “Fingerprinting bituminous binders using physicochemical analysis” focuses on bringing this method towards pre-standardization. This study evaluates the reproducibility and consistency from round robin test, where 21 participating laboratories performed six different preparation techniques on three different binders in an unaged, short-term, and long-term aged state. A total of 6461 spectra were recorded and evaluated for their mean, standard deviation and coefficient of variation (CV) in the spectral region between 1800 and 600 cm−1. The results show that the solid sample preparation methods provide excellent reproducibility, with a coefficient of variation below 2%. Only the solvent method showed a higher coefficient of variation at 7.18%. Outliers with a high CV were detected and categorized into two groups: one where only one of the four samples differed and the other where all 16 spectra showed slight scattering in the overall absorption. The consistency of the method is significantly influenced by the accuracy of sample preparation, which is crucial for minimizing differences in slope, baseline, and noise in the spectra. These findings show the excellent reproducibility of these sample preparation methods and will be further examined to establish universal indices for evaluating effects such as ageing, bringing the method closer towards standardization. KW - Bitumen KW - FTIR-Spektroskopie KW - Reproducibility KW - Round robin test KW - Material handling KW - preparation routine PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-645386 DO - https://doi.org/10.1617/s11527-025-02755-1 SN - 1359-5997 VL - 58 IS - 8 SP - 1 EP - 21 PB - Springer Science and Business Media LLC AN - OPUS4-64538 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -