How char from waste pyrolysis can improve bitumen characteristics and induce anti-aging effects

Gargiulo, Valentina; Alfè, Michela; Ruoppolo, Giovanna; Cammarota, F.; Rossi, Cesare Oliviero; Loise, Valeria; Porto, Michele; Calandra, Pietro; Pochylski, Mikołaj; Gapiński, Jacek; Caputo, Paolino

doi:10.1016/j.colsurfa.2023.132199

Cited by 7 publications

(4 citation statements)

References 51 publications

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“…The char samples were characterized by a high carbon content (around 80 wt.% for char from gran-ulated rubber tyre waste and around 45 wt.% for char from RDF) and a quite high temperature of burn-off (above 550 °C for char from WTR and above 400°C for char from RDF). In both char samples the ash content was not negligible [66]. In the WTR-char also a not negligible content of sulphur was detected [66].…”

Section: Asphalt Binder Additives Characteristicsmentioning

confidence: 86%

“…In the WTR-char also a not negligible content of sulphur was detected [66]. Both char samples contained ashes:12.5 wt.% in WTR-char and 49.2 wt.% in RDF-char [66].…”

Section: Asphalt Binder Additives Characteristicsmentioning

confidence: 94%

“…The RDF was supplied by Calabra Maceri e Servizi S.p.A, Rende (CS), Italy). Both feedstocks underwent a fast pyrolysis process (heating rate 30 °C/min, N 2 atmosphere) up to 530-550 °C in a lab scale reactor as detailed elsewhere [66].…”

Section: Asphalt Binder Additives Production and Characterizationmentioning

confidence: 99%

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Physical Chemistry Supports Circular Economy: Toward a Viable Use of Products from the Pyrolysis of a Refuse-Derived Fuel and Granulated Scrap Tire Rubber as Bitumen Additives

Caputo,

Calandra,

Loise

et al. 2023

Eurasian Chem.-Technol. J.

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The production and maintenance of road pavements consume resources and produce wastes that are disposed of in landfills. To make more sustainable this activity, we have envisioned a method based on a circular use of residues (oil and char) from municipal solid waste pyrolysis as useful additives for producing improved asphalts and for recycling old asphalts to generate new ones, reducing at the same time the consumption of resources for the production of new road pavements and the disposal of wastes to landfills. This work aims to show the feasibility of the integration of two processes (thermal treatment of municipal solid waste on one side, and that of road pavement production on the other side) where the products deriving from waste pyrolysis become added-value materials to improve the quality of road pavements. In this contribution, we presented the effect of pyrolysis product addition on asphalt binder (bitumen) preparation and aging. Solid and liquid products, deriving from the pyrolysis of two kinds of wastes (refused derived fuel (RDF) and granulated rubber tyre waste), have been used for the preparation of asphalt binder samples. Rheological tests have been performed to determine the mechanical properties of neat asphalt binder (bitumen) and those enriched with pyrolysis derived products. Measurements to evaluate possible anti-aging effects have been also performed. The collected results indicate that char addition strengthens the overall bitumen intermolecular structure while bio-oil addition exerts a rejuvenating activity.

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Section: Asphalt Binder Additives Characteristicsmentioning

confidence: 86%

“…In the WTR-char also a not negligible content of sulphur was detected [66]. Both char samples contained ashes:12.5 wt.% in WTR-char and 49.2 wt.% in RDF-char [66].…”

Section: Asphalt Binder Additives Characteristicsmentioning

confidence: 94%

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Physical Chemistry Supports Circular Economy: Toward a Viable Use of Products from the Pyrolysis of a Refuse-Derived Fuel and Granulated Scrap Tire Rubber as Bitumen Additives

Caputo,

Calandra,

Loise

et al. 2023

Eurasian Chem.-Technol. J.

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“…It must be underlined that a recent study [46] highlighted that pyrolysis of materials rich in carbon, like waste tires, can give carbon-rich char, which can be well accommodated within the bituminous matrix. In this regard, the indications of the present work corroborate that study well, by suggesting the use of CO 2 as the flowing gas to be used during pyrolysis for even more marked effects.…”

Section: Bitumen Characterizationmentioning

confidence: 99%

Char from Pyrolysis of Waste Tires to Increase Bitumen Performances

Caputo,

Calandra,

Policicchio

et al. 2023

Applied Sciences

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Road pavement characteristics can be improved by modifying bitumens through addition of fine particles. To avoid environmental issues, attention is recently being paid to bio-materials. In this study, a 50/70 bitumen was modified through the addition of char obtained from the pyrolysis of waste tires. Char addition causes an increase in transition (gel to sol) temperature of up to 4 °C and an increase in rigidity under working conditions (50 °C) of up to about one order of magnitude. The effect of the gas type flowing under the pyrolysis process (CO2, N2 and CO2 + N2) on the mechanical characteristics of the bitumen was also investigated. More marked effects on the rheological performances were found if char coming from pyrolysis under CO2 was used (the gel-to-sol transition temperature is increased by about 4.5 °C) compared to that coming from pyrolysis under N2 (gel-to-sol transition temperature is increased by about 3 °C). The effect is at a maximum for char from CO2 at 3% wt/wt, whereas regarding char from N, a lesser effect is seen with a more uniform (flat) effect as a function of char% and with an increase in gel-to-sol transition temperature of about 3 °C. Coherently, char obtained from pyrolysis under CO2 was found to possess a higher surface area constituted by smaller particles than that coming from pyrolysis under N2. In fact, the BET-specific surface passes 79 m2/g for N2-char to 174 m2/g for CO2-char and the micropore volume fraction increases from 2 to 9. The observed differences can be attributed to the oxidizing environment (CO2) that is more aggressive and reactive in the synthesis phase compared to an inert environment (N2). Char also showed an anti-aging effect, hindering the increase in rigidity typically associated with the aging process. This effect was explained in terms of the compatibility of char with bitumen’s organic nature, and presumably its more effective hosting in a bituminous structure, which is presumably higher when char is produced under CO2 rather than N2. This study quantitatively indicates how a residue derived from the pyrolysis of a waste material can be efficiently re-used to increase the mechanical characteristics of bitumen, accomplishing the recent circular-based needs for environmental protection.

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Current Thermochemical Biomass/Waste Conversion Pathways

Ofori-Boateng

2024

Sustainability of Thermochemical Waste Conversion Technologies

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How char from waste pyrolysis can improve bitumen characteristics and induce anti-aging effects

Cited by 7 publications

References 51 publications

Physical Chemistry Supports Circular Economy: Toward a Viable Use of Products from the Pyrolysis of a Refuse-Derived Fuel and Granulated Scrap Tire Rubber as Bitumen Additives

Physical Chemistry Supports Circular Economy: Toward a Viable Use of Products from the Pyrolysis of a Refuse-Derived Fuel and Granulated Scrap Tire Rubber as Bitumen Additives

Char from Pyrolysis of Waste Tires to Increase Bitumen Performances

Current Thermochemical Biomass/Waste Conversion Pathways

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