Effects of the addition of fatty acid from soybean oil sludge in recycled asphalt mixtures.

Autor: de Medeiros Melo Neto O; Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil., de Figueiredo Lopes Lucena LC; Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil. ledach@uol.com.br., Silva IM; Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil., de Figueiredo Lopes Lucena L; School of Science and Technology, Federal University of Rio Grande Do Norte, Passeio dos Girassóis 300, Natal, RN, 59077-080, Brazil., Mendonça AMGD; Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil., da Silva Lopes AM; Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil., da Silva FMM; Department of Civil Engineering, State University of Paraíba, Pedro Targino, Araruna, 58233-000, Brazil., de Amorim AG; Department of Civil Engineering, State University of Paraíba, Pedro Targino, Araruna, 58233-000, Brazil., de Oliveira Neto HR; Department of Civil Engineering, State University of Paraíba, Pedro Targino, Araruna, 58233-000, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2023 Apr; Vol. 30 (17), pp. 50174-50197. Date of Electronic Publication: 2023 Feb 15.
DOI: 10.1007/s11356-023-25808-w
Abstrakt: Recycling agents provide better additions of reclaimed asphalt pavement (RAP) in the production of new asphalt mixtures. Alternative and residual materials that have the potential as asphalt binder viscosity reducers have gained visibility in the field of paving due to the perspective of circular economy in recycled mixtures. Soybean oil sludge fatty acid is a material produced from soybean oil sludge, a waste generated in the soybean oil refining step. Thus, this paper investigated the physical, chemical, and rheological effects of the asphalt binder PG 64-XX modified by the fatty acid of soybean oil sludge in the contents of 6% and 7% by weight of the binder. The modified binder samples were submitted to penetration tests, softening point, rotational viscosity, performance grade (PG), before and after short-term aging (RTFO), and multiple stress creep and recovery (MSCR). A control asphalt mixture and recycled asphalt mixtures produced with 40% RAP and fatty acid-modified binders were subjected to tensile strength, induced moisture damage, resilient modulus, and fatigue life. A Student's t statistical test verified the significance of the data, as well as the estimation of production costs of these asphalt mixtures. The use of the fatty acid significantly reduced the stiffness and viscosity of the control asphalt binder, decreasing the mixing temperatures at 14 °C and 17 °C to 6% and 7%, respectively. Using higher fatty acid contents from soybean oil sludge significantly improved the performance of recycled mixtures in tensile strength, moisture damage, and fatigue life. The production cost of recycled asphalt mixtures was lower than that of the control mixture.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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