Oxygen Uptake As Correlated to Carbonyl Growth in Aged Asphalts and Asphalt Corbett Fractions

Liu, Milton; Ferry, M A; Davison, R. R.; Glover, Charles J.; Bullin, Jerry A.

doi:10.1021/ie980450o

Cited by 89 publications

(59 citation statements)

References 5 publications

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“…(2) The sulfoxide group is often produced in higher amounts than carbonyl, mainly in bitumen containing high sulfur content. Changes in these chemical groups can then be correlated to changes in K. Mollenhauer University of Kassel, Kassel, Germany the rheological properties and allow for a better understanding of chemo-mechanical coupling [42].…”

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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Section: Introductionmentioning

confidence: 99%

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

Porot²,

et al. 2018

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“…uptake of oxygen, have been in the focus of attention in research. Changes in these chemical groups can then be correlated to changes in the rheological properties and allow for a better understanding of chemomechanical coupling [36].…”

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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“…In this procedure, the asphalt sample was softened by heating on a hot-plate and then applied to the prism. The CA (arbitrary units), defined as the peak area above the 1820 cm À1 baseline and from 1820 to 1650 cm À1 , has been used as a direct indicator of asphalt oxidation that relates directly to changes in binder rheology [24,31,32].…”

Section: Characterizationmentioning

confidence: 99%

“…On the other hand, understanding oxidation chemistry and kinetics is complicated by the fact that the asphalt oxidative aging procedure is complex because of the diversity of molecular types and the variation of oxidation rate affected by temperature, pressure, chemical composition (specific binder), and oxygen diffusivity [16][17][18][19]. Because of its importance to pavement durability and complexity, the goal of understanding asphalt oxidation fundamentals has attracted significant work from researchers over several decades when many studies have been conducted to explore, describe and predict asphalt physicochemical properties and chemical reaction mechanisms [20][21][22][23][24][25]. One significant discovery is that the carbonyl area (CA), measured in the infrared spectrum as the absorbance peak area above the 1820 cm À1 baseline and from 1820 to 1650 cm À1 , has been reported to relate linearly to the amount of oxygen reacted with asphalt [26].…”

Section: Introductionmentioning

confidence: 99%

A study on the oxidation kinetics of warm mix asphalt

Liu

Glover

2015

Chemical Engineering Journal

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Oxygen Uptake As Correlated to Carbonyl Growth in Aged Asphalts and Asphalt Corbett Fractions

Cited by 89 publications

References 5 publications

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

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

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

A study on the oxidation kinetics of warm mix asphalt

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