Effect of Chemical Nature on the Susceptibility of Asphalt to Aging

Gaweł, Irena; Baginska, K.

doi:10.1081/lft-200034074

Cited by 43 publications

(24 citation statements)

References 12 publications

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“…The solubilizing power of the resins is affected by the degree of aromaticity in the molecules. The stability of asphalt may be described by the Gaestel instability index, which shows the dispersing capability of maltenes to asphaltenes [34,43,44]. This is also evaluated using n-heptane asphaltenes.…”

Section: Colloidal Stability Of Asphaltsmentioning

confidence: 99%

“…When assessing the colloidal stability of asphalts, the most important factor taken into account is the content of the asphaltenes. Recent studies have looked closely into the chemical composition and structure of asphaltenes [21,24,39,[40][41][42][43][44]. Thus, the two asphalt indices; I A and I C , which bear direct relationship to the content of asphaltenes can be conveniently used to estimate the extent of colloidal stability.…”

Section: The Colloidal Instability Of the Asphaltsmentioning

confidence: 99%

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Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Oyekunle¹

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Des relations entre la composition chimique et les propriétés de bitumes d'origines différentes -Les bitumes sont habituellement classés selon trois propriétés physiques : ductilité, pénétration et point de ramollissement. L'étude présentée ici démontre à travers plusieurs exemples que ces traits physiques ne sont pas assez distinctifs. Il a été découvert que la composition chimique apporte davantage d'enseignements sur les différentes propriétés physiques des bitumes. On note des différences remarquables entre la composition chimique de bitumes de même point de ramollissement et de même origine. Une plus grande ductilité provient d'une plus forte teneur en résines alors qu'une pénétration moindre est la conséquence d'une plus grande teneur en asphaltènes. La corrélation de deux indices et de la composition de bitumes révèle que l'indice Gaestël (1 c ) est un meilleur paramètre de caractérisation de bitumes que l'indice d'asphaltène (1 A ). Ces deux indices peuvent être utilisés comparativement pour distinguer des bitumes ayant des points de ramollissement voisins. Abstract -Certain Relationships between Chemical Composition and Properties of Petroleum

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Section: Colloidal Stability Of Asphaltsmentioning

confidence: 99%

Section: The Colloidal Instability Of the Asphaltsmentioning

confidence: 99%

Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Oyekunle¹

2006

Oil & Gas Science and Technology - Rev. IFP

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“…Under sufficient supply of reactive oxygen species (ROS), the oxidative aging reaction causes the bituminous binder to become stiffer and more brittle, mostly agreed to be upon increasing association among polar components of binder. While the rheological behavior of bitumen and its change with aging, on the macro-level, has been extensively studied in the last decades [6][7][8][9][10][11][12] and sophisticated models have been developed to describe the complex behavior of this material [13][14][15][16][17][18][19], the chemical composition of bitumen, its changes with aging, and in-depth analysis of its impact on the mechanical behavior, is still subject to studying [20][21][22][23][24] and intrigue many researchers in chemistry, and civil materials engineering fields.…”

Section: Introductionmentioning

confidence: 99%

Repeatability and sensitivity of FTIR ATR spectral analysis methods for bituminous binders

et al. 2017

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Bituminous binders as organic materials are prone to aging mainly by oxidation. Aging changes the viscoelastic behavior of the material over time towards higher stiffness and brittleness. FTIR has been increasingly used lately to investigate impacts of oxidative aging on the chemical structure of bitumen. Especially the carbonyl and sulfoxide bands are affected by aging and commonly used to describe changes due to evolving oxidation of a binder. However, spectra obtained from FTIR can be analyzed in fundamentally different ways and the analysis method applied to a spectrum has an impact on the gathered results and especially on the repeatability and sensitivity with regards to oxidative changes. For the presented study, two bituminous binders, a PG 64-16 and an SBS modified PG 76-22 PM were aged by RTFO and PAV and subsequently measured by FTIR. The obtained spectra (up to 90 individual spectra per aging state) were analyzed employing various methods using either the original or a normalized spectrum, a band maximum or integration based calculation of indices from an absolute or tangential baseline. By analyzing the coefficient of variation of the different analysis methods, it was found that not all analysis methods exhibit the same repeatability and sensitivity. From the findings of the study it can be recommended to work with normalized spectra, use an absolute baseline and work with integration of areas for index production in favor over band maximum based methods.

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“…Under sufficient supply of reactive oxygen species in the atmosphere, the oxidative ageing reaction causes the bituminous binder to become stiffer, less temperature susceptible and more brittle, mostly agreed to be upon increasing association among polar components of the binder. While the rheological behavior of bitumen and its change with ageing on the macro-level has been extensively studied in the last decades [6][7][8][9][10][11][12][13] and sophisticated models have been developed to describe the complex behavior of this material [14][15][16][17][18][19][20], the chemical composition of bitumen, its changes with ageing, and in-depth analysis of its impact on the mechanical behavior, is still subject to studying [21][22][23][24][25][26][27][28] and intrigue many researchers in chemistry and civil materials engineering fields.…”

Section: Introductionmentioning

confidence: 99%

FTIR spectral analysis of bituminous binders: reproducibility and impact of ageing temperature

Porot²,

et al. 2018

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This RILEM round robin study with nine participating laboratories investigated bitumen ageing, its effect on chemical properties and its reproducibility. The impact of temperature used for shortterm (RTFOT) binder ageing on the combined shortand long-term (PAV) aged samples was investigated; thereby the effect of reduced mixing temperature such as those relevant for warm mix asphalt technologies on long term ageing was examined. Four 70/100 penetration graded bituminous binders from different sources were selected. In addition to the standard RTFOT temperature of 163°C, two additional temperatures, 143 and 123°C were used. The Fourier transform infrared spectroscopy (FTIR) analysis was carried out using an integration method which considers the area below the absorbance spectrum around a band maximum using baseline and tangential approaches. A statistical investigation into the reproducibility of FTIR spectra analysis based on the accumulated data was done. To assess the reproducibility, the coefficient of variation (CV) was taken as a benchmark parameter. Carbonyl and sulfoxide indices were calculated using different baseline correction methods and tangential and baseline integration, respectively. It was shown that the tangential method was not influenced by the applied baseline correction. However, in all considered cases, the tangential method led to significantly worse reproducibility (CVs ranging from 20 to 120%) compared 10.1617/s11527-018-1170-7 to the baseline method. The sulfoxide indices calculated by both methods were not affected by the baseline correction method used. Impacts of changes in the short-term ageing temperature on short-or longterm aged samples could not be found whereas differences between different binder sources could be detected. RTFOT temperature and therefore mix production temperature had a stronger impact on the formation of sulfoxide structures than for carbonyl structures. The findings from this study show the most reproducible of all considered methods when more than one laboratory is providing FTIR data.

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Effect of Chemical Nature on the Susceptibility of Asphalt to Aging

Cited by 43 publications

References 12 publications

Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Repeatability and sensitivity of FTIR ATR spectral analysis methods for bituminous binders

FTIR spectral analysis of bituminous binders: reproducibility and impact of ageing temperature

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