A systematic AFM-based method to measure adhesion differences between micron-sized domains in asphalt binders

Yu, Xiaokong; Burnham, Nancy A.; Mallick, Rajib B.; Tao, Mingjiang

doi:10.1016/j.fuel.2013.05.084

Cited by 96 publications

(40 citation statements)

References 17 publications

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“…Finally, it is worth mentioning that AFM has also been used to investigate mechanical properties such as the relaxation modulus [199], local stiffness and elastic recovery [200], adhesion [201], elasticity/Young's modulus, stickiness/adhesion, hardness and energy loss [202], interfacial interaction between asphaltic binders and mineral surfaces [203], as well as the morphology of waxmodified asphalts [204], aging [205,206], healing properties [207], structure of thin binder films [208], and asphalts modified with nanoclays [209,210].…”

Section: Surface Morphology: Afm (The Bees) and Semmentioning

confidence: 99%

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

469

184

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During the last decades, the number of vehicles per citizen as well as the traffic speed and load has dramatically increased. This sudden and somehow unplanned overloading has strongly shortened the life of pavements and increased its cost of maintenance and risks to users. In order to limit the deterioration of road networks, it is necessary to improve the quality and performance of pavements, which was achieved through the addition of a polymer to the bituminous binder. Since their introduction, polymer-modified asphalts have gained in importance during the second half of the twentieth century, and they now play a fundamental role in the field of road paving. With high-temperature and high-shear mixing with asphalt, the polymer incorporates asphalt molecules, thereby forming a swallowed network that involves the entire binder and results in a significant improvement of the viscoelastic properties in comparison with those of the unmodified binder. Such a process encounters the well-known difficulties related to the poor solubility of polymers, which limits the number of macromolecules able to not only form such a structure but also maintain it during high-temperature storage in static conditions, which may be necessary before laying the binder. Therefore, polymer-modified asphalts have been the subject of numerous studies aimed to understand and optimize their structure and storage stability, which gradually attracted polymer scientists into this field that was initially explored by civil engineers. The analytical techniques of polymer science have been applied to polymer-modified asphalts, which resulted in a good understanding of their internal structure. Nevertheless, the complexity and variability of asphalt composition rendered it nearly impossible to generalize the results and univocally predict the properties of a given polymer/asphalt pair. The aim of this paper is to review these aspects of polymer-modified asphalts. Together with a brief description of the specification and techniques proposed to quantify the storage stability, state-of-the-art knowledge about the internal structure and morphology of polymer-modified asphalts is presented. Moreover, the chemical, physical, and processing solutions suggested in the scientific and patent literature to improve storage stability are extensively discussed, with particular attention to an emerging class of asphalt binders in which the technologies of polymer-modified asphalts and polymer nanocomposites are combined. These polymer-modified asphalt nanocomposites have been introduced less than ten years ago and still do not meet the requirements of industrial practice, but they may constitute a solution for both the performance and storage requirements.

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Section: Surface Morphology: Afm (The Bees) and Semmentioning

confidence: 99%

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

469

184

View full text Add to dashboard Cite

show abstract

“…X-ray computed tomography (CT) was used to study the 3-dimensional (3D) distribution of the asphalt mastic in fine aggregate mix and asphalt concrete [3]. Atomic force microscopy (AFM) was employed to investigate the interfacial interaction and adhesion strength between asphalt binders and mineral surfaces [4,5]. Dynamic Mechanics Analyzer (DMA) testing [6] and Dynamic shear rheometer (DSR) testing [7] were carried out to characterize the adhesion bond strength and adhesion fatigue performance of asphalt concrete composites under shear loading.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of interfacial mechanical behavior between asphalt binder and mineral aggregate

Wang

2016

Construction and Building Materials

145

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“…The existence of ordered agglomerates has been proven by small angle X-ray scattering and small angle neutron scattering experiments [11][12][13] and the nature of asphaltene agglomeration is well established for different solvents, leading to problems and discussions regarding the size of the asphaltenes and their agglomerates [11,[14][15][16]. The existence of a bitumen microstructure and its visualization was performed by various techniques, ranging from confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) to atomic force microscopy (AFM) [17][18][19][20][21][22][23][24][25][26]. A detailed comparison of various imaging technique was performed by Bearsley et al [18].…”

Section: Introductionmentioning

confidence: 99%

Impact of maltene and asphaltene fraction on mechanical behavior and microstructure of bitumen

et al. 2015

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As a widely accepted concept, bitumen consists of four fractions that can be distinguished by their polarity. Highly polar asphaltene micelles are dispersed in a viscous phase of saturates, aromatics and resins (maltene phase). Different concentrations of asphaltenes in the bitumen result in a range of mechanical response properties. In an interdisciplinary study the impact of the maltene phase and asphaltenes on the linear viscoelastic behavior and the microstructure of bitumen were analyzed by creep recovery testing in a DSR and by atomic force microscopy (AFM). Therefore, bitumen was separated into the maltene and asphaltene fractions and artificial bitumen samples with different, pre-defined asphaltene concentrations were produced and investigated. It was found that the artificially produced, precipitated bitumen samples can be regarded as a representative, bitumen-like material in terms of mechanical behavior and microstructure. Asphaltenes play an important role in the typical viscoelastic behavior of bitumen being mainly responsible for stiffness and elasticity. Also, their concentration appears to be correlated to the occurrence and shape of the bee-like inclusions which can be typically observed by AFM.

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A systematic AFM-based method to measure adhesion differences between micron-sized domains in asphalt binders

Cited by 96 publications

References 17 publications

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Molecular dynamics study of interfacial mechanical behavior between asphalt binder and mineral aggregate

Impact of maltene and asphaltene fraction on mechanical behavior and microstructure of bitumen

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