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Vol. 29. Issue 1.
Materiais 2015
Pages e198-e203 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e198-e203 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.07.004
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Foamed bitumen: an alternative way of producing asphalt mixtures
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Liliana Abreua,
Corresponding author
id4217@alunos.uminho.pt

Corresponding author.
, Joel Oliveirab, Hugo Silvab, Catarina Silvaa, Daniela Palhac, Paulo Fonsecac
a Department of Civil Engineering (DEC), University of Minho, Guimarães 4800-058, Portugal
b Centre for Territory, Environment and Construction (CTAC), University of Minho, Guimarães 4800-058, Portugal
c Elevogroup, MonteAdriano Engenharia e Construção, Porto 4250-311, Portugal
Article information
Abstract

With the constant need to improve and make the production of asphalt mixtures more sustainable, new production techniques have been developed, the implementation of which implies the correct knowledge of their performance. One of the most promising asphalt production techniques is the use of foamed bitumen. However, it is essential to understand how this binder will behave when subjected to the expansion process. The loss of volume of the foamed bitumen could be translated by a decay curve, which allows to determine the ideal temperature and water content added to the bitumen in order to assure adequate conditions to the mix the bitumen with the aggregates. On the present study, a conventional 160/220 pen grade bitumen was tested by using different temperatures and water contents, and it was concluded that the optimum temperature for the production of foamed bitumen (with the studied bitumen) is 150°C, which corresponds to a viscosity of 0.1Pa.s. The water content mostly influence the half-life of the bitumen foam, resulting in quicker volume reductions for higher water contents.

Keywords:
Warm mix asphalt
foamed bitumen
asphalt mixtures
bitumen foaming characteristics
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Copyright © 2017. Portuguese Society of Materials (SPM)
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