Record link: 
http://hdl.handle.net/20.500.12708/148206
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Title: 
The bitumen microstructure: a fluorescent approach
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Citation: 
Handle, F., Füssl, J., Neudl, S., Großegger, D., Eberhardsteiner, L., Hofko, B., Hospodka, M., Blab, R., & Grothe, H. (2016). The bitumen microstructure: a fluorescent approach. Materials and Structures, 49(1–2), 167–180. https://doi.org/10.1617/s11527-014-0484-3
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Publisher DOI: 
10.1617/s11527-014-0484-3
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Handle, Florian 
Füssl, Josef 
Neudl, Susanna 
Großegger, Daniel 
Eberhardsteiner, Lukas 
Hofko, Bernhard 
Hospodka, Markus 
Blab, Ronald 
Grothe, Hinrich 
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Organisational Unit: 
E165-01 - Forschungsbereich Physikalische Chemie 
E230-03 - Forschungsbereich Straßenwesen 
E165-01-5 - Forschungsgruppe Physikalische Chemie von Aerosolpartikeln 
E202-02 - Forschungsbereich Struktursimulation und Ingenieurholzbau 
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Journal: 
Materials and Structures 
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ISSN: 
1359-5997
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Date (published): 
2016
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Number of Pages: 
14
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Publisher: 
SPRINGER
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Peer reviewed: 
Yes
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Keywords: 
Mechanics of Materials; General Materials Science; Bitumen; Microstructure; Building and Construction; Civil and Structural Engineering; Photoluminescence spectroscopy; Optical microscopy
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Abstract: 
Five bituminous samples were carefully studied by confocal laser scanning microscopy using 488 nmexcitation radiation and observing 500-530 nm of emission. The images revealed the microstructure of bitumen. The influence of the admixture of mineral aggregates concerning the microstructure was tested. For the minerals, no significant influence was found. For understanding the origin of fluorescent signals, the samples were separated into asphaltenes and maltenes and analyzed with fluorescence spectroscopy. Although former works have assumed the origin of fluorescent emissions in bitumen to be found in the asphaltene fraction, the asphaltenes produce little to no emissions, but the maltenes exhibit strong fluorescence in the observed spectral region. For deeper insight, fractionation of the bitumina into the SARA fractions by chromatographic columnseparationwas necessary. The fluorescence spectra of these fractions were analyzed and revealed the aromatics and resin phases to be the only components capable of sufficiently intense fluorescent emission. This is a strong argument for a complex internal microstructure consisting of a mantle of aromatics surrounding an inner core.
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Research Areas: 
Environmental Monitoring and Climate Adaptation: 25%
Energy Active Buildings, Settlements and Spatial Infrastructures: 25%
Materials Characterization: 50%
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Science Branch: 
Chemie
Bauingenieurwesen
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