Research on the Microstructure and Property of an Anion Rubber Modified Asphalt

Hong, Wei; Liu, Qingshan; Guan, Guoquan; Di, Youbo; Sun, Jing; Jiao, Tifeng; Xing, Guangzhong

doi:10.1155/2013/316401

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…In this case, there is no trace of the network structure, and the two techniques resulted in very similar images with higher resolution obtained using SEM. For completeness, we mention a recent paper by Wei et al [186], who used SEM to characterize a rubber asphalt but did not show high-magnification images or describe the preparation of the sample prior to observation. Nevertheless, SEM is not ideal to observe asphalt samples, and in the last few years, there has been a considerable increase in papers that use AFM for both morphological and mechanical characterization.…”

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

526

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

526

184

View full text Add to dashboard Cite

show abstract

“…To observe the effect of GO on the microscopic characteristics of TPU–SBS-modified asphalt, the scanning electron microscope was operated at 5 kV with a magnification of 100–600 times. Before the specimens were observed, they were continuously sputter-coated with a thin gold film and placed under infrared light for drying [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Graphene Oxide on the Low-Temperature Crack Resistance of Polyurethane–SBS-Modified Asphalt and Asphalt Mixtures

Zhang

et al. 2022

Polymers

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In this study, the novel nanomaterial graphene oxide (GO) was added as a modifier to polyurethane–styrene-butadiene-styrene (SBS)-modified asphalt, and a graphene oxide/polyurethane/SBS composite-modified asphalt mix was prepared. The effect of the graphene oxide material on the low-temperature crack resistance of the asphalt and mixes was investigated by bending beam rheometer (BBR) tests, beamlet bending tests at different low temperatures, and characterization by scanning electron microscopy for its microscopic condition. OpenCV image processing was used to visually represent the low-temperature cracking of the mix. The results of the BBR tests showed that the incorporation of graphene oxide resulted in a reduction in creep stiffness S and an increase in creep rate m compared with the control asphalt. The best improvement in the low-temperature cracking resistance of the polyurethane/SBS-modified asphalt was achieved at 0.5% GO doping. The results of the small beam flexural tests showed that graphene oxide as a modifier improved the flexural strength and flexural strain of the mix, resulting in a mix with a lower stiffness modulus and a better relaxation stress capacity with the addition of graphene oxide, which is also expressed through the OpenCV images. Graphene oxide significantly improved the low-temperature crack resistance of polyurethane-SBS-modified asphalt and its mixes. As a new type of nanomaterial-modified asphalt, graphene oxide/polyurethane/SBS composite-modified asphalt shows promising applicability in cold zone roads.

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Research on the Microstructure and Property of an Anion Rubber Modified Asphalt

Cited by 2 publications

References 11 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

Effect of Graphene Oxide on the Low-Temperature Crack Resistance of Polyurethane–SBS-Modified Asphalt and Asphalt Mixtures

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