Flue gas composition of waste rubber modified asphalt (WRMA) and effect of deodorants on hazardous constituents and WRMA

Cao, Liping; Yang, Chunli; Li, Ao; Wang, Peng; Zhang, Yong; Zhang, Dong

doi:10.1016/j.jhazmat.2020.123814

Cited by 50 publications

(10 citation statements)

References 30 publications

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“…The MWD of the negative ion mode was located in the range of 10–600 Da. In previous research, headspace GC–MS was the most widely used asphalt fume analysis method, and the results of these works showed that the molecular weight of detected VOCs in asphalt fumes was below 400 Da. ,,,, In addition, none of the work has pointed out that the molecular weight of the compounds in asphalt fumes may be above 400 Da due to the limitation of the analysis method. However, the results obtained by the established method show that there are many peaks in the mass range of 400–800 Da, which indicates that the chemical composition of asphalt fumes is much more complex than the reported composition in previous literature.…”

Section: Results and Discussionmentioning

confidence: 99%

“…For example, thermal gravimetric analysis–mass spectrometry (TGA-MS), proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS), and gas chromatography–mass spectrometry (GC–MS) have been used to assess the VOC emission in different asphalt materials. Among them, GC–MS has been used most frequently in asphalt fume analysis. ,− For example, GC–MS has been successfully used to analyze polycyclic aromatic hydrocarbons, , oxygenated VOCs, nitrogen VOCs, sulfur VOCs, and carboxylic acids in bitumen. When combined with headspace sampling technology, the sample collection and analysis steps can be integrated within a gas chromatograph–mass spectrometer.…”

Section: Introductionmentioning

confidence: 99%

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Rapid and Direct Assessment of Asphalt Volatile Organic Compound Emission Based on Carbon Fiber Ionization Mass Spectrometry

et al. 2023

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Due to the complicacy of asphalt fumes, the analytical methods for investigating volatile organic compounds (VOCs) are very limited. In this study, a direct and real-time analysis method based on carbon fiber ionization mass spectrometry (CFI-MS), an ambient mass spectrometric technique, was established and successfully applied in the analysis of asphalt VOCs. The asphalt VOCs can be directly detected in the open atmosphere without the collection step of asphalt fumes, and the mass spectra of one asphalt sample can be obtained in a few seconds in both positive and negative ion modes. By investigating the mass spectral changes of asphalt fumes at different heating temperatures ranging from 50 to 200 °C, the temperature factor of asphalt fume emission was demonstrated in this work. The research results demonstrate that the complexity of asphalt fumes is positively related to the applied temperature. Moreover, the VOCs of saturates, aromatics, resins, and asphaltenes fractions were also analyzed by the direct analysis method. The result shows that aromatics contribute most to the emission of VOCs. In addition, the obtained mass spectra combined with the principal component analysis method show the great potential to quickly screen VOC inhibitors of asphalt materials.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid and Direct Assessment of Asphalt Volatile Organic Compound Emission Based on Carbon Fiber Ionization Mass Spectrometry

et al. 2023

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“…All inhibitors, including activated carbon, 4A zeolite, and nano calcium carbonate, effectively reduced VOC emissions, with nano calcium carbonate exhibiting the highest efficacy. In a similar study, Cao et al showed that deodorants effectively suppressed the escape of toxic volatiles from rubberized asphalt. In addition, deodorant increased the stability of rubberized asphalt during heating, facilitated rubber dispersion in asphalt binder, and improved the aging resistance of asphalt binder.…”

Section: Economic Environmental and Health Impactsmentioning

confidence: 92%

Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Kazemi,

Parikhah Zarmehr,

Yazdani

et al. 2023

Energy Fuels

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Applications of end-of-life tires (ELT) for energy recovery and new products can contribute to a circular economy. This paper reviews the environmental, health, and economic aspects of various applications of ELT, focusing specifically on the use of ELT in fuel, energy, and construction. Impediments to a more widespread application of repurposed ELT include a lack of streamlined handling and recycling processes; a poor understanding of the long-term ecological, human health, and safety consequences; and very few application-specific techno-economic assessments and life-cycle analyses. The prospects for rubberized asphalt as an economical and environmentally benign application of ELT are reviewed in four areas: (1) rubber pretreatmentthe most effective techniques are chemical or microwave radiation, and the most sustainable technique is microbial devulcanization; (2) aging behaviorrubber particles delay aging in asphalt through several mechanisms; (3) techno-economic benefitsrubberized asphalt improves the cost-efficiency and energy-efficiency of asphalt; and (4) environmental emissions and leakage concernsthe risk of heavy metals and hazardous pollutants such as polycyclic aromatic hydrocarbons and volatile organic compounds contaminating the ecosystem or causing occupational diseases in workers. There are four priority directions for future research on rubberized asphalt: (1) determine the critical aging point; (2) describe the self-rejuvenating behavior; (3) quantify the long-term leachate under extensive weathering; and (4) compare the ecological aspects of pretreatment techniques in terms of potential greenhouse gas emissions and human health.

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“…This not only posed a serious threat to human health but also resulted in severe pollution to the surrounding environment. Consequently, these issues greatly impeded the extensive adoption and application of HVMA in pavement engineering [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fume Suppression, Viscosity-Retarding, and Rheological Properties of Eco-Friendly High-Viscosity Modified Asphalt

Ning,

Sun,

Qiu

et al. 2023

Coatings

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In order to address the issues of high viscosity and excessive fume exhaust associated with high-viscosity modified asphalt (HVMA), the objective of this study was to develop an eco-friendly HVMA by incorporating fume suppressants and viscosity-retarding agents (VRAs). To begin with, desulfurization rubber powder (DRP) was utilized as a modifier, and fume suppressants, including activated carbon, a chemical reaction fume suppressant, and a composite fume suppressant combining activated carbon and chemical reaction fume suppressant were added to the HVMA separately. The fume suppression effect and odor level were observed to determine the optimal fume suppressant composition for this study. Based on these observations, an area integration method was proposed, utilizing rotational viscosity testing and temperature sweeping experiments, evaluating the viscosity-retarding effect and mixing temperature when different amounts of Sasobit VRA, Evotherm3G VRA, and a composite VRA of Sasobit and Evotherm3G were added to the HVMA. This approach aimed to identify the eco-friendly HVMA with the most effective fume suppression and viscosity-retarding abilities. Furthermore, the morphology and rheological properties of the eco-friendly HVMA were examined through fluorescence microscopy, zero shear viscosity test, multiple stress creep recovery analysis, liner amplitude sweep test, and frequency sweep test. The results demonstrated that the HVMA formulation consisting of 15% DRP and 1% composite fume suppressant exhibited a satisfactory fume suppression effect and odor level. Based on this, the HVMA formulation containing 0.6% Evotherm3G and 3% Sasobit VRAs displayed the best viscosity-retarding effect while reducing the mixing temperature. Moreover, when compared to common HVMA, the eco-friendly HVMA exhibited excellent high-temperature resistance, successfully accomplishing the dual objectives of ecological friendliness and superior performance.

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Flue gas composition of waste rubber modified asphalt (WRMA) and effect of deodorants on hazardous constituents and WRMA

Cited by 50 publications

References 30 publications

Rapid and Direct Assessment of Asphalt Volatile Organic Compound Emission Based on Carbon Fiber Ionization Mass Spectrometry

Rapid and Direct Assessment of Asphalt Volatile Organic Compound Emission Based on Carbon Fiber Ionization Mass Spectrometry

Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Evaluation of Fume Suppression, Viscosity-Retarding, and Rheological Properties of Eco-Friendly High-Viscosity Modified Asphalt

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