Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/45810

TítuloSuitability of different foamed bitumens for warm mix asphalts with increasing recycling rates
Autor(es)Abreu, L. P. F.
Oliveira, Joel
Silva, Hugo Manuel Ribeiro Dias da
Palha, D.
Fonseca, P. V.
Palavras-chaveAsphalt mixtures
Decay curves
Expansion ratio
Foam index
Foam stabilizing additive
Foamed bitumen
Half-life
Recycling
Water sensitivity
DataJul-2017
EditoraElsevier
RevistaConstruction and Building Materials
CitaçãoAbreu L. P. F., Oliveira J. R. M., Silva H. M. R. D., Palha D., Fonseca P. V. Suitability of different foamed bitumens for warm mix asphalts with increasing recycling rates, Construction and Building Materials, Vol. 142, pp. 342 - 353, doi:10.1016/j.conbuildmat.2017.03.085, 2017
Resumo(s)Due to the current need for more sustainable production processes and construction materials, foamed bitumen has become one of the most interesting solutions for asphalt paving works, both for new (warm mix) and recycled asphalt mixtures (warm recycled mix). However, significant work still needs to be carried out in order to fully understand the performance of foamed bitumens, and their adequacy for incorporation into asphalt mixtures with different amounts of reclaimed materials, which is the main objective of this work. Three types of bitumen, with increasing penetration grades were selected in order to evaluate their foaming properties, namely their expansion ratio and half-life, as well as the foam index assessed using the foam decay curves obtained through a semi-automated process. After determining the most suitable composition of each foamed bitumen (water content, temperature, foam stabilizing additive content), these were incorporated into asphalt mixtures with 0%, 30% and 50% reclaimed asphalt material. As the amount of reclaimed material increased, the penetration grade of the new bitumen added was also increased, in order to compensate the lost properties of the aged binder. The suitability of these solutions was assessed through water sensitivity tests, and it was concluded that the proposed approach is adequate to obtain long-lasting solutions. Moreover, it became evident that foamed bitumens perform better when incorporated into recycled asphalt mixtures.
Tipoarticle
URIhttp://hdl.handle.net/1822/45810
DOI10.1016/j.conbuildmat.2017.03.085
ISSN0950-0618
Versão da editorahttp://www.sciencedirect.com/science/article/pii/S0950061817304580
Arbitragem científicayes
AcessorestrictedAccess
Aparece nas coleções:C-TAC - Artigos em Revistas Internacionais

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