Introducing the critical aging point (CAP) of asphalt based on its restoration capacity

Oldham, Daniel; Obando, Carlos J.; Mousavi, Masoumeh; Kaloush, Kamil; Fini, Elham H.

doi:10.1016/j.conbuildmat.2021.122379

Cited by 15 publications

(5 citation statements)

References 38 publications

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“…D. R. Liang studied the structural changes during thermal-oxidative aging of CTP by using Fourier transform infrared spectroscopy (FTIR), and divided the thermal-oxidative aging process into two stages. Daniel J. Oldham [7] proposed a critical aging point (CAP) for asphalt and concluded that the asphalt aging quickly in the early stages, mainly due to oxidation, and the reaction changes to aromatization and carbonization as the aging time increases. Asphalt binder components with high polarization rates (e.g., asphaltenes and resins polarization rates between 527-876) are more susceptible to oxidation than low polarization rates (e.g., saturates polarization rates less than 380) [8].…”

Section: Introductionmentioning

confidence: 99%

Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

Chen

Guo

et al. 2021

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Coal tar pitch (CTP) is abundant and widely used, but its properties will be affected due to oxidation aging during storage. In this study, CTP was oxidized by simulating the air oxidation process, and the change of chemical structure has been analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and both gas chromatography and mass spectrometry (GCMS). The effects of the oxidized and unoxidized CTP co-carbonization with coal on the polycyclic aromatic hydrocarbons (PAHs) emission were detected by GCMS. The small and medium-molecule aromatic substances were reduced during CTP oxidation, while the intermolecular condensation reaction increased the macromolecules content. The catalytic can effectively facilitate the dehydrogenation and condensation reaction of CTP and the entry of oxygen molecules, which leads to the increase of oxygen-containing groups and the decrease of PAHs. Compared to the raw CTP, the catalytic oxidized CTP significantly reduced the emissions of toxic PAHs during the co-carbonization with coal. A possible catalytic mechanism of CTP catalytic oxidation is proposed.

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Section: Introductionmentioning

confidence: 99%

Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

Chen

Guo

et al. 2021

Catalysts

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“…The rheological aging index was calculated based on the change in the crossover modulus, which has proven to be highly sensitive to aging. 33,34 The rheological aging index for each scenario was calculated as Rheological aging index unaged crossover modulus aged crossover modulus unaged crossover modulus 100…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The rheological aging index was calculated based on the change in the crossover modulus, which has proven to be highly sensitive to aging. , The rheological aging index for each scenario was calculated as …”

Section: Methodsmentioning

confidence: 99%

Toward Carbon-Negative and Emission-Curbing Roads to Drive Environmental Health

Ghasemi

Yazdani

Rajib

et al. 2022

ACS Sustainable Chem. Eng.

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Roadway infrastructures are exposed to solar ultraviolet (UV) radiation during their service life. UV rays generate free radicals that diffuse deep into bitumen layers, accelerating the aging and degradation of bituminous composites. Here, we hypothesize that carbonaceous particles grafted by bioderived molecules such as amines and amides can serve as scavengers of free radicals, delaying aging in bituminous composites. To test this hypothesis, we use laboratory experiments and molecular dynamics simulations to compare the efficacy of biochars made from woody biomass and algal biomass in delaying the aging of bituminous composites. We further examine the underlying molecular mechanisms that delay aging by computing the extent of diffusion of free radicals through an amorphous graphite film in the pristine form and in amine-and amidefunctionalized forms. The laboratory results indicate that algal biochar is considerably more effective than woody biochar in delaying aging. The simulation results corroborate laboratory findings showing that even at low concentrations, surface functionals such as amines and amides considerably enhance the efficacy of pristine carbon in shielding the underlying layers against the diffusion of free radicals such as hydrogen peroxide (H 2 O 2 ). At high concentrations (e.g., 10 wt %), amines were found to be more effective than amides in reducing the diffusion rate of H 2 O 2 . This indicates that the scavenging efficacy of carbonaceous particles can be optimized by proper biografting. The algae that were used to make functionalized carbonaceous particles in this study are a means to capture CO 2 from air. Therefore, our findings contribute to extending the sustainability of highway infrastructures while moving toward carbon-negative and emission-curbing roads to promote environmental health.

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“…Volatilization of asphalt hydrocarbons contributes to mass loss and aging of the material, leading to changes in bitumen's colloidal structure as well as rheological and performance characteristics. This in turn makes asphalt stiffer and more prone to crack (Oldham et al, 2021). Economic factors have encouraged the recycling of asphalt products into new surfacing of roads (Kumpiene et al, 2021;Andersson-Sköld et al, 2007; Resource Responsible Use of Reclaimed Asphalt Pavement in Asphalt Mixtures [tech brief], 2021).…”

Section: Modulating Emissions: Impacts Of Additives In Bitumenmentioning

confidence: 99%

Systems biology of asphalt pollutants and their human molecular targets

et al. 2023

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More than 90% of all the roads in the United States are covered with asphalt, despite hundreds of scientific studies demonstrating the detrimental effect of asphalt on human health. Asphalt is a complex mixture of thousands of compounds. Here, we not only review studies of the effects of asphalt on human health, but go a step further by taking a novel view of these health effects from a systems biology perspective. In particular, we propose an analogy to protein-protein interaction networks, which can be within species and across species when looking at host-pathogen interactions. While in the former, all nodes are of the same type (e.g., human proteins), in the latter nodes can be of different types, such as human proteins and pathogen proteins. To build a corresponding network of interactions between different nodes for asphalt, we retrieved the literature studying the molecular targets of identified components in asphalt and their corresponding cellular biomarkers. Using this approach, we show that a complex trans pollutant-human target network appears in which multiple health effects can be triggered through interactions of multiple pollutant molecules with multiple human targets. We envision that the insights gained from this analysis may assist future efforts at regulating the use of asphalt.

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Introducing the critical aging point (CAP) of asphalt based on its restoration capacity

Cited by 15 publications

References 38 publications

Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

Toward Carbon-Negative and Emission-Curbing Roads to Drive Environmental Health

Systems biology of asphalt pollutants and their human molecular targets

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