Investigation of Chemistry by FTIR and NMR during the Natural Exposure Aging of Asphalt

Ma, Lixing; Li, Zhida; Huang, Junfeng

doi:10.1061/47623(402)18

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…Among the three aliphatic protons (H α , H β , and H γ ), the H β represents the major saturated proton for all binders under all three aging states. This observation is also in agreement with those reported by [ 47 , 49 , 50 ]. No apparent changes could be determined for H α and H β with an increase in the degree of aging.…”

Section: Resultssupporting

confidence: 94%

“…However, a strong trend was found between H γ and the severity of aging, with a greater H γ value indicating to a more aged binder ( Fig 17 ). Such a trend was also reported in [ 47 ], where higher H γ values were found when the binder aging exposure period was increased from 30 days to 60, 90, and 120 days. Zhang and Hu [ 49 ] also observed a higher H γ for the control (unmodified) and a crumb rubber-SBS-sulfur composite binder after the binders were subjected to thin film oven aging (another protocol that simulates short-term aging).…”

Section: Resultssupporting

confidence: 85%

“…Furthermore, the H ar values of aged binders were lower than unaged binders. This may be due to higher condensation and substitution of aromatic structures in the binders due to aging, as also concluded by Ma et al [ 47 ].…”

Section: Resultsmentioning

confidence: 55%

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Aging characteristics of asphalt binders modified with waste tire and plastic pyrolytic chars

2021

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Globally, the growing volume of waste tires and plastics has posed significant concerns about their sustainable and economical disposal. Pyrolysis provides a way for effective treatment and management of these wastes, enabling recovery of energy and produces solid pyrolytic char as a by-product. The use of pyrolytic chars in asphalt binder modification has recently gained significant interest among researchers. As asphalt binder aging influences the cracking, rutting, and moisture damage performance of asphalt binder and the mixtures, evaluation of aging characteristics of char modified asphalt binders is quite important. The main objective of this study is the investigation of the aging characteristics of asphalt binders modified with waste tire pyrolytic char (TPC) and waste plastic pyrolytic char (PPC) through rheological and spectroscopic evaluations. To imitate short-term and long-term aging conditions, the asphalt binders were first treated in a rolling thin film oven (RTFO) and then in a pressure aging vessel (PAV). The aging characteristics were determined using four rheological aging indices based on complex modulus (G*), phase angle (δ), zero shear viscosity (ZSV), and non-recoverable creep compliance (Jnr) from multiple stress creep and recovery (MSCR) test. The fatigue cracking potential was then measured through binder yield energy test (BYET). These parameters were measured through a dynamic shear rheometer. Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy analyses were then used to investigate changes in chemical composition due to aging in the char modified binders. Both TPC and PPC improved the high-temperature deformation resistance properties of asphalt binder. The TPC-modified binder showed better aging resistance than the control and PPC-modified binders, based on the different rheological and spectroscopic indices. The pyrolytic char modified binders also demonstrated good fatigue performance.

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Section: Resultssupporting

confidence: 94%

Section: Resultssupporting

confidence: 85%

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Aging characteristics of asphalt binders modified with waste tire and plastic pyrolytic chars

2021

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“…No Brasil, cerca de 95% das estradas brasileiras são pavimentadas com revestimento asfáltico (BERNUCCI et al, 2010). Segundo Airey (2003), os principais fatores que afetam a durabilidade dos pavimentos asfálticos, considerando que sua execução foi realizada de forma correta, são o enrijecimento pelo envelhecimento e o dano pela umidade. Os principais defeitos desses pavimentos são a deformação permanente, o trincamento por fadiga e o trincamento térmico (BERNUCCI et al, 2010;PIRES et al, 2017).…”

Section: Introductionunclassified

“…Ao longo dos anos, muitos métodos foram desenvolvidos com o intuito de correlacionar o envelhecimento acelerado em laboratório com o envelhecimento sofrido pelo ligante durante o processo de usinagem e vida de serviço. Segundo Airey (2003), a maioria das pesquisas utilizam procedimentos com aquecimento prolongados em estufas e filmes finos de ligante. A Tabela 1 apresenta os métodos desenvolvidos para simulação do envelhecimento de curto e longo prazo dos ligantes asfálticos em laboratório.…”

Section: Introdução E Revisão Bibliográficaunclassified

Avaliação do envelhecimento e rejuvenescimento de ligantes asfálticos.

Takahashi¹

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The aging and rejuvenation of two neat asphalt binders were evaluated in this study.Both binders are from an experimental section that was built with dense hot asphalt mixtures of the two binders, with 4 cm thick. The binders were extracted and recovered from the samples collected from the experimental sections at different times (T = 0, 12, 24, 36 and 108 months after the pavement construction). In the laboratory, the virgin binders were aged using RTFOT, PAV 20h, PAV 60h and SUNTEST. Rheological frequency sweep tests were carried out, as well as the analysis of the parameters G*c, ωc, R and GR. In addition, MSCR and LAS tests were carried out to evaluated the resistance to permanent deformation and to fatigue, respectively, of both binders at different levels of aging and rejuvenation. The SARA fraction, GPC, FTIR and NMR tests were performed to evaluate the chemical changes resulting from laboratory and field aging. The results show that the SUNTEST aging was the most severe, showing the importance of UV radiation in the aging process of asphalt binders. In addition, photochemical aging causes different chemical reactions in the asphalt binders when compared to thermo oxidative aging, with different impact on chemical fractions of the two binders evaluated. In the field, binders continued to age over time, resulting in chemical and performance changes in asphalt binders. The comparison between laboratory and field aging showed that aging in the field (after 36 months) was more severe than the PAV 20h, and the results were closer to PAV 60h, for both binders.The use of pine-based rejuvenating agent with 2%, 4% and 6% content, showed that the AR allowed to recover most of the properties of the aged binders with 4% of AR.However, rejuvenation follows a different trend from aging, showing that AR acts differently on the viscoelastic properties of aged binders. In addition, the AR dosage evaluation using different parameters showed that the dosage only through binder's linear viscoelastic properties may not be sufficient to guarantee the final performance of the recycled mixtures.

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Multiscale evaluation of aging susceptibility of asphalt binders modified with recycled rubber and plastic pyrolytic oil composites

Kumar,

Choudhary

2024

Construction and Building Materials

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Investigation of Chemistry by FTIR and NMR during the Natural Exposure Aging of Asphalt

Cited by 6 publications

References 2 publications

Aging characteristics of asphalt binders modified with waste tire and plastic pyrolytic chars

Aging characteristics of asphalt binders modified with waste tire and plastic pyrolytic chars

Avaliação do envelhecimento e rejuvenescimento de ligantes asfálticos.

Multiscale evaluation of aging susceptibility of asphalt binders modified with recycled rubber and plastic pyrolytic oil composites

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