Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/77973
Título: | Viability of using high amounts of steel slag aggregates to improve the circularity and performance of asphalt mixtures |
Autor(es): | Moura, Caroline Nascimento, Lucas Loureiro, Carlos Rodrigues, Mafalda Oliveira, Joel R. M. Silva, Hugo M. R. D. |
Palavras-chave: | Asphalt pavements Circular economy Mechanical performance Mix design Steel slag aggregates (SSA) |
Data: | 1-Jan-2022 |
Editora: | MDPI |
Revista: | Applied Sciences |
Citação: | Moura, C.; Nascimento, L.; Loureiro, C.; Rodrigues, M.; Oliveira, J.; Silva, H. Viability of Using High Amounts of Steel Slag Aggregates to Improve the Circularity and Performance of Asphalt Mixtures. Appl. Sci. 2022, 12, 490. https://doi.org/10.3390/app12010490 |
Resumo(s): | Steel slag is a byproduct generated as waste during the steelmaking process and can be considered a cost‐effective and environmentally acceptable alternative to replace natural aggre-gates. Using steel slag aggregates (SSA) to produce asphalt mixtures promotes sustainability and circular economy principles by using an industrial byproduct as a raw material. Thus, this work mainly aims to design more sustainable asphalt mixtures with high amounts of SSA that fit the circular economy expectations. This work developed two asphalt mixtures with SSA for surface (AC 14 surf) and binder/base (AC 20 bin/base) courses. Initially, the excellent wearing and polishing resistance of SSA and their good affinity with bitumen demonstrated the potential of this byproduct to be used in asphalt mixtures. Then, when analyzing the influence of using two different SSA incorporation rates (50% and a percentage close to 100%) in both asphalt mixtures, it was concluded that the use of SSA should be limited to 75% to avoid excessive air void contents and durability problems. The importance of considering the different particle densities of SSA and natural aggregates was highlighted during the mix design by defining a relationship between an effective and equivalent binder content. Finally, the mechanical performance of AC 14 and AC 20 with 75% SSA incorporation was compared to identical conventional mixtures produced with natural granite ag-gregates. The results obtained showed that the asphalt mixtures with 75% SSA have some worka-bility problems due to the rough and porous surface of SSA. However, they present an excellent water sensitivity and permanent deformation resistance, surpassing the performance of the conventional asphalt mixtures. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/77973 |
DOI: | 10.3390/app12010490 |
Versão da editora: | https://www.mdpi.com/2076-3417/12/1/490 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | ISISE - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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applsci-12-00490-v2.pdf | 3,09 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons