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

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 ec...

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Bibliographic Details
Published in:	Environmental science and pollution research international Vol. 30; no. 17; pp. 50174 - 50197
Main Authors:	de Medeiros Melo Neto, Osires, de Figueiredo Lopes Lucena, Leda Christiane, Silva, Ingridy Minervina, de Figueiredo Lopes Lucena, Luciana, Mendonça, Ana Maria Gonçalves Duarte, da Silva Lopes, Albaniza Maria, da Silva, Flavia Maria Mendes, de Amorim, Alex Guedes, de Oliveira Neto, Hugo Ribeiro
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2023 Springer Nature B.V
Subjects:	Aquatic Pollution Asphalt Asphalt mixes Asphalt pavements Atmospheric Protection/Air Quality Control/Air Pollution Binders Binders (materials) Circular economy Construction Materials Damage Earth and Environmental Science Ecotoxicology Environment Environmental Chemistry Environmental Health Environmental science Fatigue failure Fatigue life Fatigue tests Fatty Acids Materials fatigue Moisture effects Penetration tests Petroleum refining Production costs Reagents Research Article Rheological properties Sewage Sludge Softening points Soybean Oil Soybeans Statistical tests Stiffness Tensile strength Vegetable oils Viscosity Waste Water Technology Water Management Water Pollution Control RAP Costs test Rheology FTIR Mechanical performance Recycling agent Waste t test
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1614-7499 0944-1344 1614-7499
DOI:	10.1007/s11356-023-25808-w