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Journal ArticleDOI: 10.1080/14680629.2019.1637771

Influence of ageing conditions on the chemical property changes of asphalt binders

04 Mar 2021-Road Materials and Pavement Design (Taylor & Francis)-Vol. 22, Iss: 3, pp 653-681
Abstract: This study examines the influence of different ageing conditions on the commonly interested chemical properties of asphalt binders, including the oxygenated functional groups and Corbett fractions....

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Topics: Chemical property (51%)
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Open accessJournal ArticleDOI: 10.1016/J.MATDES.2019.108272
Ying Yuan1, Xingyi Zhu1, Long ChenInstitutions (1)
05 Jan 2020-Materials & Design
Abstract: Identifying the properties of the bond strength between aggregates and asphalt binders is critical to understand the strength and fracture behavior of asphalt mixture. Some efforts have been made on the effect of aging on the bonding property of the asphalt binder. However, there is no consensus result and the mechanism that drives the change of bonding property remains unclear. The objective of this study is to investigate the influence of aging on the bonding property, and to explain the reason lies behind. To achieve this goal, four neat asphalt binders were treated with short-term aging and long-term aging. The bond strength and the adhesion force were measured by binder bond strength test on a macro scale and atomic force microscope on a micro scale, respectively. Based on the result obtained in this study and previous publications along with the adhesion theories, it is found that a moderate aging contributes to the bond strength while a sever aging does not necessarily improve the bond strength. The change of bond strength under an aging condition can be explained by the cohesion force in asphalt binders and the adhesion force between asphalt binders and aggregates. Based on the results, it can be concluded that the cohesion force increases with aging time as a result of asphaltenes association. The adhesion force increases initially and then decreases, and the wettability is thought to be responsible for the reduction of adhesion force. The adhesion reduction can be observed on the three phases (catana phase, peri phase, para phase) of the asphalt binders, which leads to the adhesion reduction on the whole asphalt binders. These findings help to provide a better understanding of the change of bonding property of asphalt binders during an aging process, which contributes to the improvement of bond strength by enhancing the wettability of each phase in asphalt binders appropriately. The results have practical significance and can help to optimize the materials production process.

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Topics: Bond strength (57%)

17 Citations


Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2020.119702
Abstract: Oxidative ageing in bituminous materials is considered one of the most important factors for distress types in road applications This paper aims to offer insights into the validity of commonly held beliefs regarding the oxidation phases of ageing in bitumen, the fast- and the slow-rate phase, and explore the main oxidation products formed upon ageing In order to evaluate possible differences between bitumen types, the penetration grade as well as the bitumen production process was varied Thus, the ageing of three different binders was first studied by Fourier-Transform Infrared (FTIR) and Electron Paramagnetic Resonance (EPR) spectroscopy The formation of oxygen-containing molecular structures on the bitumen surface during ageing was studied with Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) The results of FTIR reveal a gradual increase of sulfoxides upon ageing, while the EPR results show an increase of organic carbon-centred radicals In parallel, TOF-SIMS results provide evidence for an increase of oxygenated compounds, such as SOx--, HOx-- and NOx--containing compounds It appears also that paramagnetic metal species, such as vanadyl-porphyrins, are insusceptible during ageing Overall, the findings of this study are in agreement with a mechanism comprising two rate-determining phases and support the formation of different oxygenated products It is believed that the experimental approach used in this work may contribute further to an improved understanding of the ageing mechanisms in bitumen

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11 Citations


Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2021.123182
Abstract: Understanding the fundamental mechanisms of oxidative ageing in bitumen is considered of paramount importance in order to take steps towards durable binders able to tackle distresses related to this phenomenon which deteriorates the asphalt performance. This paper focuses on the identification of the intermediate and final oxygenated products after short- and long-term laboratory ageing simulated with rolling thin-film oven testing (RTFOT) and pressurised ageing vessel (PAV) respectively. Three binders were investigated in this study, two originated from the same wax-free crude source, while the third was obtained from a different source, containing natural wax, and followed a different manufacturing process. Fourier-Transform Infrared (FTIR) spectroscopy demonstrated a clear increase of the sulfoxide and carbonyl functional groups upon ageing for all the binders independently of origin, manufacturing or performance. Electron Paramagnetic Resonance (EPR) spectroscopy showed an increase of the organic carbon-centred radicals after short-term ageing (RTFOT), whereas after PAV these radicals remained constant in the two wax-free binders originating from the same crude source, and even decreased for the third, waxy binder. Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy reported differences in the relative distribution of protons between the binders in the unaged state, and similar minor changes after both ageing steps regardless of the binder’s crude source and distillation. The results of Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) revealed that SOx- and (OH)x-containing compounds are produced after the sequentially occurring short- and long-term ageing in both wax-free bitumens, whereas an almost constant behaviour of aliphatics after PAV ageing can be seen for the same bitumens. Finally, the strengths and weaknesses of each of these experimental techniques were reviewed and compared versus the obtained results and possible ageing mechanisms.

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7 Citations


Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2020.121862
Yuhong Wang1, Kecheng Zhao1, Fangjin Li1, Qi Gao2  +1 moreInstitutions (2)
Abstract: Over the years, different hypotheses and speculations have been developed on asphaltenes, but their presence in asphalt has never been directly observed. In this study, asphaltenes in nine types of asphalt that vary in crude oil source and aging states are examined through scanning transmission electron microscopy (STEM) and atomic force microscopy (AFM). No solvent casting is used in sample preparation; hence, the natural state of the asphaltenes is preserved. Asphaltene particles are also separated and examined for their morphology and toughness. The impacts of asphaltene content and morphology on the zero shear viscosity (ZSV) and derived ductility of asphalt are investigated. STEM images reveal that asphaltenes in non-aged asphalt are generally well dispersed, with occasional formation of large agglomerates, and both the size of well-dispersed asphaltenes and the abundance of the agglomerates are dependent on asphalt source. Rod-shaped, crystal-like asphaltene particles can be found in both artificially-aged and field-aged asphalts. A probe into asphaltene particles using AFM suggests that the toughness of the particles is low. Rheological test results indicate that asphaltene content plays a predominant role in determining the relative ZSV (ratio between the system ZSV and the liquid phase ZSV), and asphaltene morphology likely plays a secondary role. Conversely, both the content and morphology of asphaltenes likely play major roles in determining the derived ductility of asphalt.

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Topics: Asphaltene (64%), Asphalt (50%)

6 Citations


Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2021.122386
Jianmin Ma1, Guoqiang Sun2, Daquan Sun1, Fan Yu3  +2 moreInstitutions (3)
Abstract: Understanding the link between molecular composition and macro-mechanical performance of asphalt binder is crucial for the selection, modification and performance prediction of asphalt binder. As one of the chemical analysis technologies, gel permeation chromatography (GPC) provides an efficient and accurate approach to separate asphalt molecules based on the size difference. This review summarized the application of GPC in characterizing asphalt materials. The basic principle, test methods and data analysis were introduced firstly. Then the applications of GPC in asphalt materials in terms of fraction detection, modification process characterization, aging characterization, recycled asphalt evaluation, and performance prediction were systematically reviewed. Finally, several suggestions were made for the future application of GPC technology in asphalt material analysis. This review potentially provides a guide for researchers to understand the performance of asphalt binders from the perspective of molecular weight distribution, and further promotes the development of renewable, sustainable and durable asphalt materials for pavement construction and rehabilitation.

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Topics: Asphalt (53%)

5 Citations


References
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12 results found


Journal ArticleDOI: 10.1021/EF990225Z
23 Mar 2000-Energy & Fuels
Abstract: Fluorescence depolarization measurements are used to determine the size of asphaltene molecules and of model compounds for comparison Mean molecular weights of roughly 750 amu with a range of roughly 500−1000 amu are found for petroleum asphaltenes A strong correlation is established between the size of an individual fused ring system in an asphaltene molecule and the overall size of this corresponding molecule, showing that asphaltene molecules have one or perhaps two fused ring systems per molecule Subtle differences in molecular size are found for different virgin crude oil asphaltenes and for a vacuum resid asphaltene Coal asphaltene molecules are found to be much smaller than petroleum asphaltenes The molecular sizes of resins and asphaltenes are found to form a continuous distribution

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Topics: Asphaltene (64%)

741 Citations


Open accessBook
25 Aug 2008-
Abstract: The first € price and the £ and $ price are net prices, subject to local VAT. Prices indicated with * include VAT for books; the €(D) includes 7% for Germany, the €(A) includes 10% for Austria. Prices indicated with ** include VAT for electronic products; 19% for Germany, 20% for Austria. All prices exclusive of carriage charges. Prices and other details are subject to change without notice. All errors and omissions excepted. O.C. Mullins, E.Y. Sheu, A. Hammami, A.G. Marshall Asphaltenes, Heavy Oils, and Petroleomics

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Topics: Petroleomics (59%), Asphaltene (51%)

452 Citations


Journal ArticleDOI: 10.1080/14680629.2011.9713895
Abstract: The correlation between asphalt viscosity increase on oxidative aging and the carbonyl compounds formed (almost exclusively ketones) has been well established; however, the effect of sulfoxide formation on physical properties during age hardening has received little attention. Evidence is presented in this paper that shows that the alcohols, which are formed concurrently with the sulfoxides from the same hydroperoxide precursors as the ketones, have a similar effect on asphalt viscosity increase as does the ketones. These alcohols are the main contributors to oxidative age hardening of high sulfur asphalts. Analysis of the kinetic data for ketone and sulfoxide formation during asphalt oxidation also provides additional evidence for the validity of the dual asphalt oxidation mechanism previously reported.

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185 Citations


Journal ArticleDOI: 10.3141/1638-06
Abstract: The kinetic data and chemistry of asphalt oxidative age hardening suggested a sequential, dual mechanism for asphalt oxidation. The dual mechanism rationalizes conflicts between earlier mechanistic investigations and explains the hyperbolic-like, time-versus-property plots characteristic of asphalt oxidative aging. The oxidation kinetics provide further confirmation of the asphalt microstructural model. It is proposed that the rapid initial oxidation rate of asphalt results from reaction of oxygen with limited amounts of highly reactive hydrocarbons. Final oxidation products of this initial reaction are sulfoxides and, most likely, ring aromatization. During this initial reaction, a slower oxidation reaction of asphalt benzylic carbons is initiated; final products are ketones and sulfoxides. The ratio of ketones to sulfoxides formed and the rate of age hardening were found to be dependent on temperature and oxygen pressure. Low-temperature oxidative aging, as occurs in pavements, was found significantly m...

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158 Citations


Journal ArticleDOI: 10.1081/LFT-120016946
Abstract: Literature reports indicate that the ductility of binders recovered from asphalt pavements correlate with cracking failure. However, ductility measurement is a time and material consuming process, ...

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Topics: Ductility (55%)

101 Citations


Performance
Metrics
No. of citations received by the Paper in previous years
YearCitations
20218
20203