Author:
Handle Florian,Füssl Josef,Neudl Susanna,Grossegger Daniel,Eberhardsteiner Lukas,Hofko Bernhard,Hospodka Markus,Blab Ronald,Grothe Hinrich
Abstract
Abstract
Five bituminous samples were carefully studied by confocal laser scanning microscopy using 488 nm excitation 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 column separation was 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.
Publisher
Springer Science and Business Media LLC
Subject
Mechanics of Materials,General Materials Science,Building and Construction,Civil and Structural Engineering
Reference62 articles.
1. Abraham H (1920) Asphalts and allied substances, 4th edn. D. Van Nostrand Company Inc., New York
2. Acevedo S, García LA, Rodríguez P (2012) Changes of diameter distribution with temperature measured for asphaltenes and their fractions A1 and A2. Impact of these measurements in colloidal and solubility issues of asphaltenes. Energy Fuels 26:1814–1819. doi:10.1021/ef201947h
3. Aske N, Kallevik H, Johnsen EE, Sjöblom J (2002) Asphaltene aggregation from crude oils and model systems studied by high-pressure NIR spectroscopy. Fuel 2002:1287–1296
4. ASTM International (2001) Standard test methods for separation of asphalt into four fractions, vol D4124-01. ASTM International, West Conshohocken
5. Bearsley S, Forbes A, Haverkamp RG (2004) Direct observation of the apshaltene structure in paving-grade bitumen using confocal laser-scanning microscopy. J Microsc 215:149–155
Cited by
91 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献