Technical feasibility for the replacement of high rates of natural aggregates in asphalt mixtures

Israel Rodríguez-Fernández, Pedro Lastra-González, Irune Indacoechea-Vega, Daniel Castro-Fresno

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This research demonstrates the technical feasibility of replacing new raw materials by recycled and renewable alternative ones to make different sustainable asphalt mixes. In order to verify performance, a comparative analysis of different alternative materials was carried out. Electric arc furnace (EAF) slag, basic oxygen furnace (BOF) slag, waste foundry sand and reclaimed asphalt pavement (RAP) were used to replace natural aggregates in different proportions to enable the impact on asphalt concrete to be studied. Moreover, with the aim of restoring the properties of old binder from RAP and maximising the reduction in the amount of virgin binder needed, the effect of two rejuvenators was evaluated. The technical feasibility of using asphalt mixtures with a natural aggregate replacement rate of 80–98% was demonstrated at laboratory level. In this sense, the use of EAF and BOF slag to replace high-quality natural aggregate in the coarse fraction and the use of waste foundry sand to replace natural aggregate in the fine fraction proved to be a promising option. Furthermore, a significant virgin binder reduction was achieved with the combined use of RAP and rejuvenator, without compromising the mechanical performance of the mixtures.
Original languageEnglish
Pages (from-to)(In-Press)
Number of pages10
JournalInternational Journal of Pavement Engineering
Early online date20 Aug 2019
Publication statusE-pub ahead of print - 20 Aug 2019
Externally publishedYes

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Pavement Engineering on 20/08/2019, available online:


  • Asphalt
  • recycled materials
  • Reclaimed asphalt pavement
  • by-products
  • rejuvenator

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