Investigating bitumen long-term-ageing in the laboratory by spectroscopic analysis of the SARA fractions

Mirwald, Johannes; Werkovits, Stefan; Camargo, Ingrid; Maschauer, Daniel; Hofko, Bernhard; Grothe, Hinrich

doi:10.1016/j.conbuildmat.2020.119577

Cited by 79 publications

(31 citation statements)

References 28 publications

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“…It can be found that the infrared spectra of HVMA have significant differences under different solar radiation intensities. At 0 W/m 2 solar radiation intensity, HVMA has a small carbonyl peak around 1700 cm –1 , which indicates that HVMA has undergone a certain degree of thermal aging at this time . Besides, HVMA still has an obvious PB peak around 966 cm –1 after 12 days of weathering aging.…”

Section: Resultsmentioning

confidence: 97%

“…The carbonyl peak around 1700 cm –1 and sulfoxide peak around 1031 cm –1 increase sharply, indicating that HVMA has been oxidized severely at the surface under the effect of solar radiation and diffuse oxygen. This is because asphalt SARA fractions, except for saturates, all produce significant carbonyl and sulfoxide under solar radiation . The PB peak around 966 cm –1 almost disappears, which shows that the polymer phase at the surface has been mostly degraded.…”

Section: Resultsmentioning

confidence: 98%

“…In this study, the Bruker TEN-SOR attenuated total reflection fourier transform infrared spectroscopy (ATR–FTIR) spectrometer was applied to investigate the changes in the chemical composition of HVMA. The weathering aging of HVMA was composed of two processes: asphalt oxidation and polymer degradation. , In the infrared spectrum of HVMA, the carbonyl peak area centered around 1700 cm –1 was chosen to characterize the oxidation of asphalt and the polybutadiene (PB) peak area centered around 966 cm –1 was used to characterize the degradation of polymer in this study …”

Section: Methodsmentioning

confidence: 99%

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Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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The objective of this study was to investigate the aging depth gradient distribution of high viscosity modified asphalt (HVMA) under the effect of solar radiation and diffuse oxygen. The HVMA samples with different thicknesses were prepared to perform the weathering aging under different solar radiation intensities. Then, the Fourier transform infrared spectroscopy test, gel permeation chromatography test, and fluorescence microscopy test were used to study the chemical composition and micromorphology characteristic of HVMA at different aging depths. Afterward, the dynamic shear rheology test and multiple stress creep recovery test were applied to investigate the macroscopic rheological performance of HVMA. The test results showed that the effect of solar radiation aging diffused from the asphalt surface to the asphalt inside gradually. As the solar radiation intensity and aging time increased, the significant aging depth of HVMA increased continuously. At the surface, HVMA absorbed the solar light near the characteristic absorption band to activate the asphalt molecules and polymer molecules and had oxidation and depolymerization reactions with the full participation of diffuse oxygen. Simultaneously, HVMA also showed continuous microcracks at the surface due to the direct radiation of solar light. As the aging depth increased, the cracking phenomenon disappeared, and the asphalt oxidation rate and polymer degradation rate of HVMA decreased gradually. The increase of solar radiation intensity causes more severe aging at the surface and a faster downward propagation rate of aging effect, thus resulting in accelerated deterioration of the macroscopic rheological performance of HVMA.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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“…This is followed by the 50/70-binder A (0.79), the 160/220-binder D (0.77) and 70/100binder B (0.73). However, as previously mentioned, it needs to be kept in mind that the binder initial ageing index (AIFTIR @ Day 0) are slightly different which can be linked to differences in their SARA fractions [10]. Therefore, in order to judge the oxidation behaviour of all four binders, a previously reported power law fit was applied, as shown in the red curve in Fig.…”

Section: Variation In Storage Time and Conditionsmentioning

confidence: 99%

“…Other quantification methods have also been proposed by researchers from the BRRC [7] or LCPC [8], or participants from the MURE project [9], which suggest the utilization of a valley-to-valley or deconvolution method for quantification of IR bands. While this integration can indeed provide a good outcome for sulfoxide and ketone formation, it neglects an overall increase in the fingerprint region which is linked to the polarity shift in bitumen occurring during ageing [10]. Another, more advanced spectral data analysis methods is proposed by Weigel and Stephan [11], which makes use of standard normal variant (SNV) transformation and multivariance analysis to detect or predict the properties of a binder in regards to its crude oil origin.…”

Section: Introductionmentioning

confidence: 99%

Recommendations for handling bitumen prior to FTIR spectroscopy

2022

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The application of chemical analysis on bituminous materials has increased drastically over the past decades. One of the most common spectroscopic methods used in the field of research is Attenuated Total Reflection (ATR) Fourier Transform Infrared (FTIR) spectroscopy. Since ATR-FTIR is a surface sensitive method, sample or specimen handling of a complex material like bitumen prior to its analysis needs to be considered, especially for people new to the field or analysis technique. This study looks at the impact of heating time and temperature as well as storage time and conditions on the oxidation of the bituminous specimen. Four binders from the same crude oil source but different specification classes (unmodified and styrene–butadiene–styrene polymer modified) and two binders from different crude oil sources were investigated. The results show that heating small quantities of bitumen at 180 °C for up to 30 min has little impact on the formation of oxidized species, when proper thermal monitoring is conducted. Special cases where oxidation does occur are reported in detail. Furthermore, strong oxidation is induced by day light, when bitumen is stored behind glass with no UV radiation present, which can reach short-term ageing level within 1 h. Thus, heating bitumen at 180 °C for 5–10 min followed by storage in the dark, climatized room and measured within one hour after preparation is recommended. These results should act as recommendation for future specimen handling prior to FTIR spectroscopic analysis to ensure unbiased and comparable measurements.

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Controlled Microencapsulation of Rejuvenators by Jet Vibration to Promote Self-healing in Bituminous Materials

2023

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Investigating bitumen long-term-ageing in the laboratory by spectroscopic analysis of the SARA fractions

Cited by 79 publications

References 28 publications

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Recommendations for handling bitumen prior to FTIR spectroscopy

Controlled Microencapsulation of Rejuvenators by Jet Vibration to Promote Self-healing in Bituminous Materials

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