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Investigation of Microscale Aging Behavior of Asphalt Binder Using Atomic Force Microscopy
Ming Wang,Liping Liu,Lijun Sun +2 more
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TLDR
In this paper, the effects of long-term aging on both SBS-modified asphalt and base asphalt using AFM were investigated, and two new indices were introduced to quantify changes in the microstructures of asphalt, namely, the percentage of elliptical bee structures and surface roughness.Abstract:
Abstract Atomic force microscopy (AFM) has the capacity to distinguish among different phases at high resolution, and it is widely used in obtaining topography and mechanical property maps for asphalt binders. This study investigated the effects of long-term aging on both SBS-modified asphalt and base asphalt using AFM. In describing the study findings, this paper introduces two new indices used to quantify changes in the microstructures of asphalt, namely, the percentage of elliptical bee structures and surface roughness. In addition, the Derjaguin-Muller-Toporov modulus and adhesive force were measured to quantify the mechanical properties of the micro-phases. Finally, to evaluate the influence of aging on composite phase properties, a parallel model from the field of composite materials was introduced and applied. The results indicate that aging significantly affected the microstructures and mechanical behavior of micro-phases of asphalt binders. Aging also had a significant influence on the microstructures of the asphalt, especially in the bee structures. The percentage of bee structures increased or decreased after aging depending on the asphalt binder type, while surface roughness always decreased. Aging also increased the composite modulus of the micro-phases and decreased the composite adhesion of the micro-phases. These findings are in agreement with the macroscale aging behavior of asphalt binders.read more
Citations
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Understanding the bitumen ageing phenomenon: A review
TL;DR: In this paper, an overview of a number of studies related to the ageing process in bitumen, to determine the main component affecting this phenomenon is provided, and a review is presented of the in-laboratory tests used to simulate the different ageing processes (short-term ageing, long-term aging, UV ageing) that occur in the field, along with a description of the techniques currently employed to analyse what happens to the binder after ageing.
Journal ArticleDOI
Research progress in advanced nanomechanical characterization of cement-based materials
TL;DR: In this paper, the basic knowledge involved in the state-of-the-art nanomechanical characterization techniques have been systematically summarized in detail and the critical issues (e.g., sample preparation procedures and requirements, measurements, and data analysis methods) of these techniques are discussed in details.
Journal ArticleDOI
A review of phase structure of SBS modified asphalt: Affecting factors, analytical methods, phase models and improvements
TL;DR: In this paper, the effects of SBS type and dosage, asphalt type, processing technology and environment on phase structure and separation are reviewed and the correlation between SBS modified asphalt and chemical composition, micromechanics, rheological properties, and other aspects are analyzed.
Journal ArticleDOI
Atomic force microscope study of the aging/rejuvenating effect on asphalt morphology and adhesion performance
TL;DR: In this article, the influence of aging/rejuvenation on the bonding performance of asphalt binder has not been fully understood, and the results in this study can help to better understand the impact of aging and rejuvenation on asphalt bond performance.
Journal ArticleDOI
Asphalt binder micro-characterization and testing approaches: A review
TL;DR: In this article, a review of the typical application of those technologies in exploring asphalt binder properties and recent highlights is presented, along with problems impacting the microscopic test results translating to physical properties.
References
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Journal ArticleDOI
Influence of aging on the evolution of structure, morphology and rheology of base and SBS modified bitumen
TL;DR: In this paper, the influence of aging on the evolution of structure, morphology and rheology of base bitumen and SBS modified binders was investigated by Fourier transform infrared (FTIR), atomic force microscopy (AFM) and dynamic shear rheometer (DSR), respectively.
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Morphology of asphalts, asphalt fractions and model wax-doped asphalts studied by atomic force microscopy
TL;DR: In this paper, the interaction between crystallising paraffin waxes and the remaining asphalt fractions is hypothesized to be responsible for much of the structuring, including the well-known bee structures.
Journal ArticleDOI
Understanding the bitumen ageing phenomenon: A review
TL;DR: In this paper, an overview of a number of studies related to the ageing process in bitumen, to determine the main component affecting this phenomenon is provided, and a review is presented of the in-laboratory tests used to simulate the different ageing processes (short-term ageing, long-term aging, UV ageing) that occur in the field, along with a description of the techniques currently employed to analyse what happens to the binder after ageing.
Journal ArticleDOI
Impact of maltene and asphaltene fraction on mechanical behavior and microstructure of bitumen
Bernhard Hofko,Lukas Eberhardsteiner,Josef Füssl,Hinrich Grothe,Florian Handle,Markus Hospodka,Daniel Grossegger,S.N. Nahar,A.J.M. Schmets,Athanasios Scarpas +9 more
TL;DR: In this article, 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).
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Influence of short and long term aging on chemical, microstructural and macro-mechanical properties of recycled asphalt mixtures
Lily D. Poulikakos,Salomé dos Santos,Moises Bueno,Simon Kuentzel,Martin Hugener,Manfred N. Partl +5 more
TL;DR: In this article, a Swiss standard surface course and a high modulus base course were produced containing 0% or 40% reclaimed asphalt pavement (RAP), short and long term aged and investigated regarding their chemical, microstructural and mechanical properties.