Variation of the composition of asphaltenes in the course of bitumen aging in the presence of antioxidants

Zaidullin, I. M.; Petrova, L. M.; Yakubov, M. R.; Borisov, D. N.

doi:10.1134/s1070427213070203

Cited by 20 publications

(9 citation statements)

References 11 publications

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“…The parameters M n , M w , and d of 90#A show an increasing trend after UV aging. Figure 12 also shows that the oxidation of components with medium and low molecular weights and the evaporation of components with low molecular weight mainly occur in the UV aging of base asphalt, which is consistent with the conclusions of previous studies [ 52 , 55 ]. The M n value of SBRMA shows a decreasing trend after UV aging, but the Mw value shows the opposite trend.…”

Section: Resultssupporting

confidence: 90%

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Niu

Zhu

et al. 2023

Materials

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The ultraviolet (UV) aging of asphalt is an important factor affecting the long-term performance of asphalt pavement, especially in high altitude cold regions. The current studies have reported that styrene butadiene rubber-modified asphalt (SBRMA) has a good cracking resistance at low temperatures. In addition, polyphosphoric acid (PPA) is an effective modifier that can enhance the anti-UV aging properties of asphalt. However, the understanding of the improvement mechanism of PPA on the anti-aging of SBRMA remains unclear. Therefore, this study aimed to evaluate the effect of PPA on the UV aging resistance of SBRMA. The rheological properties of PEN90 asphalt(90#A), SBRMA, and PPA/SBR modified (PPA/SBR-MA) before and after UV aging were evaluated by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The molecular weight and chemical structure of 90#A, SBRMA, and PPA/SBR-MA were determined by Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC), and the interaction and modification mechanism of the modifiers were analyzed. The rheological analysis shows that the high and low temperature performances of SBRMA are improved by adding PPA, and PPA also significantly reduces the sensitivity of SBRMA to UV aging. The microscopic test results show that PPA has a complex chemical reaction with SBRMA, which results in changes in its molecular structure. This condition enhances SBRMA with a more stable dispersion system, inhibits the degradation of the polymer macromolecules of the SBR modifier, and slows down the aging process of base asphalt. In general, PPA can significantly improve the anti-UV aging performance of SBRMA. The Pearson correlations between the aging indexes of the macro and micro properties are also significant. In summary, PPA/SBRMA material is more suitable for high altitude cold regions than SBRMA, which provides a reference for selecting and designing asphalt pavement materials in high altitude cold regions.

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Section: Resultssupporting

confidence: 90%

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Niu

Zhu

et al. 2023

Materials

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“…The oxidation of bitumen reduces its elasticity and increases its hardness; these changes are called bitumen chemical aging. 41 The reason for increased asphalt hardening is that the intermolecular bonds of asphalt become stronger because of the creation of functional groups after oxidation. 121 According to studies, 122−124 carbonyl compounds and sulfoxides increase during the aging process.…”

Section: Chemical Agingmentioning

confidence: 99%

“…During oxidation, the asphaltenes and resins fractions of bitumen absorb oxygen in an irreversible process that alters the bitumen’s characteristics. The oxidation of bitumen reduces its elasticity and increases its hardness; these changes are called bitumen chemical aging . The reason for increased asphalt hardening is that the intermolecular bonds of asphalt become stronger because of the creation of functional groups after oxidation .…”

Section: Chemical Agingmentioning

confidence: 99%

“…There are other factors that also influence the aging process: temperature; rainfall; solar radiation; and mixture properties such as void content and permeability, type of aggregates, thickness of the binder layer, storage time, and plant type. , One type of aging is short-term aging, which is related to the amount of bitumen hardening during asphalt’s manufacturing stage and during asphalt’s placement and compaction . Bitumen hardens for three main reasons: evaporation of volatile compounds, chemical aging (also referred to as bitumen oxidation), and physical aging (also referred to as physical hardening). − The distinction of physical hardening compared to the other two is that it is a reversible process and does not affect the chemical composition of the bitumen . Physical hardening is mainly induced by wax crystallization in maltene .…”

Section: Physical Aging Of Bitumenmentioning

confidence: 99%

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Future Directions for Applications of Bio-Oils in the Asphalt Industry: A Step to Sequester Carbon in Roadway Infrastructure

2023

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The global emphasis on sustainability and net zero carbon roads combined with the increased cost of crude oil has necessitated the application of new environmentally friendly alternatives to the bitumen used in asphalt by the pavement industry. Physical aging, chemical aging, and moisture damage are three important matters encountered in the pavement industry that are harmful for asphalt; bio-oils can decelerate the rates of physical aging and chemical aging in virgin bitumen, and bio-oils can substantially improve virgin bitumen’s resistance to moisture damage. Bio-oils can also restore properties in environmentally damaged asphalt up to a certain limit of aging. The main goal of this review is a comprehensive analysis of the literature about the potential of bio-oils produced from different biomass sources to influence the physical aging, chemical aging, and moisture damage of asphalt. Considering that bitumen’s physical aging is highly impacted by the bitumen’s wax content, this review also covers the effect of wax inherently present in bitumen or wax added to bitumen as a modifier. It is concluded that the chemical composition of a bio-oil has a significant impact on the bio-oil’s ability to protect or recover the bitumen’s original properties. Phenolic compounds found in bio-oils have antiaging effects while bio-oils’ acidic compounds may lead to moisture susceptibility.According to the literature, most bio-oils have positive effects only in a specific range of temperatures: low, intermediate, or high. Complete miscibility and dispersion of a bio-oil in the asphalt matrix also have a significant influence on making a bio-oil an effective modifier. Generally, bio-oils are promising as sustainable, carbon-neutral, cost-effective alternatives to replace or modify conventional bitumen in the pavement industry. This review has identified the following critical research gaps: (1) the lack of standard methods for evaluating and reporting the performance characteristics of each bio-oil in bitumen; (2) the lack of long-term field performance data on bio-oils to support comprehensive life-cycle assessments and life-cycle analyses; (3) high variation among bio-oils made from the same feedstock through different processing methods, leading to variation in performance characteristics; (4) the lack of accurate technoeconomic analysis on industrial bio-oils to facilitate entry of bio-oils into the asphalt market.

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“…During mixing, transport and spreading of the conglomerate, the thin film bitumen is instead exposed to high temperature and atmospheric oxygen; the resulting chemical changes translate into obvious physical changes. In particular, there is a substantial reduction of the aromatic fraction together with the increase in the content of resins and asphaltenes [7,8]. The saturated content remains substantially unchanged due to the relatively low reactivity of the components in question.…”

Section: Introductionmentioning

confidence: 99%

Effects of Natural Antioxidant Agents on the Bitumen Aging Process: An EPR and Rheological Investigation

et al. 2018

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Bitumen aging is the major factor contributing to the deterioration of the road pavement. Oxidation and volatilization are generally considered as the most important phenomena affecting aging in asphalt paving mixtures. The present study was carried out to investigate whether various antioxidants provided by natural resources such as phospholipids, ascorbic acid as well as lignin from rice husk, could be used to reduce age hardening in asphalt binders. A selected bituminous material was modified by adding 2% w/w of the anti-aging natural additives and subjected to accelerated oxidative aging regimes according to the Rolling Thin Film Oven Test (RTFOT) method. The effects of aging were evaluated based on changes in sol-gel transition temperature of modified bitumens measured through Dynamic Shear Rheology (DSR). Moreover, changes of Electron Paramagnetic Resonance (EPR) spectra were monitored on the bituminous fractions asphaltene and maltene separated by solvent extraction upon oxidative aging. The phospholipids-treated binder exhibited the highest resistance to oxidation and the lowest age-hardening effect compared to the other tested anti-oxidants. The combination of EPR and DSR techniques represents a promising method for elucidating the changes in associated complex properties of bitumen fractions promoted by addition of free radical scavengers borrowed by green resources.

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Variation of the composition of asphaltenes in the course of bitumen aging in the presence of antioxidants

Cited by 20 publications

References 11 publications

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Future Directions for Applications of Bio-Oils in the Asphalt Industry: A Step to Sequester Carbon in Roadway Infrastructure

Effects of Natural Antioxidant Agents on the Bitumen Aging Process: An EPR and Rheological Investigation

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