Bituminous emulsions and their characterization by atomic force microscopy

Loeber,; Alexandre, Stéphane; Müller, Martin Anton; Triquigneaux,; Jolivet,; Malot,

doi:10.1046/j.1365-2818.2000.00667.x

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…Small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS) experiments have proven beyond doubt that ordered structures in bitumen exist [12,13,44,48,59]. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) have revealed a morphology of characteristic and reproducible appearance, which is often described as ''bee-like'' structures of 1-5 lm [8,15,27,28,30,35,36,38,51,53,60,61]. Confocal laser scanning microscopy (CLSM) has uncovered the existence of fluorescent centers in bitumen of 1-10 lm size, indicating high concentrations of fluorescent species in definite volume elements evenly dispersed through the material [5,33].…”

Section: Introductionmentioning

confidence: 99%

The bitumen microstructure: a fluorescent approach

et al. 2014

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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.

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Section: Introductionmentioning

confidence: 99%

The bitumen microstructure: a fluorescent approach

et al. 2014

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“…It consists of two main fractions: asphaltenes and maltenes (Loeber et al, 2000;Loeber et al, 1998;Masson et al, 2006). The asphaltenes are defined as the bitumen fraction that is insoluble in n-heptane.…”

Section: Bitumenmentioning

confidence: 99%

“…For that reason the oil phase (maltenes), which is disturbing the observation, must be removed (Loeber et al, 2000;Loeber et al, 1998;). It may cause the change of the original structure and consequently have an impact on the results of the observation.…”

Section: Bitumenmentioning

confidence: 99%

Scanning Electron Microscopy Method as a Tool for the Evaluation of Selected Materials Microstructure

Pospisil¹,

Frýbort²,

Kratochvíl³

et al. 2008

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This paper introduces CDV's research on microstructure evaluation of two selected materials used in pavements or structures, i.e. cement concrete and bitumen. A Scanning Electron Microscope (SEM) has been used as the main equipment. In the case of cement concrete time-dependent changes in the microstructure of self-compacting concrete (SSC) are described. The microstructures and differences in void and pore system of matured SSC with commonly used micro-fillers are also shown here. In the case of bitumen the paper anticipates that the relationship between the composition, structure and usable properties of bitumen have not yet been clarified enough. The SEM method requires an appropriate preparation as the raw bitumen samples can not be watched directly. The oil fraction, precluding the observation, must be eliminated. Nevertheless, its removal may cause a modification of the original structure, and this might consequently have an impact on the results of the observation.

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