Avaliação do envelhecimento a curto prazo nas propriedades reológicas de ligantes asfálticos modificados com resíduo da mineração de cobre sulfetado
Study of resistance to drainage in asfalic concrete against temperature variation and incorporation of copper mining residue
Ricardo Bentes Kato
Resumo
O envelhecimento dos ligantes asfálticos altera as propriedades das misturas asfálticas, e provoca alterações reológicas, porém nas especificações brasileiras alguns parâmetros levam em consideração o envelhecimento do ligante e seus efeito sobre as propriedades reológicas dos materiais. O objetivo deste artigo é identificar as alterações reológicas devido ao envelhecimento a curto prazo em ligantes asfálticos aditivados com resíduo da mineração do cobre sulfetado, pois vislumbra-se a adição do resíduo ao ligante asfáltico na região amazônica em função do grande volume de produção deste tipo de rejeito. Os resultados mostraram diferenças insignificantes das amostras com e sem resíduo, inclusive para ensaio de MSCR que resultou em ligantes resistentes ao tráfego padrão, podendo suportar volume de 10 milhões de eixos padrões durante a vida de projeto
Palavras-chave
Abstract
The aging of the asphalt binders alters properties of the asphalt mixtures, besides causes rheological changes, however the Brazilian specifications still do not take into account this effect on the rheological properties of the materials. The objective of this paper is to identify the rheological changes due to the short-term aging of asphalt binders added with the sulfide copper mine tailing, in order to verify the possibility of its use in asphalt mixtures of Amazon region due to the fact of wide production of copper mine tailing. The results showed insignificant differences of the samples with and without residue, including for the MSCR test that resulted in asphalt binders resistant to standard traffic, allowing support a volume of 10 million standard axes during the project life.
Keywords
Referências
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Submetido em:
31/08/2019
Aceito em:
25/05/2020
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