Bituminous base courses for flexible pavements with steel slags

  1. Marta Skaf Revenga 1
  2. Javier Bartolomé González 1
  3. Hernán Gonzalo Orden 1
  4. Alaitz Linares Unamunzaga 1
  5. Vanesa Ortega López 1
  6. Juan Manuel Manso Villalaín 1
  1. 1 Universidad de Burgos

    Universidad de Burgos

    Burgos, España


R-evolucionando el transporte [Recurso electrónico]: XIV Congreso de Ingeniería del Transporte. Universidad de Burgos 6, 7 y 8 de julio 2021
  1. Hernán Gonzalo Orden (ed. lit.)
  2. Marta Rojo Arce (ed. lit.)

Publisher: Servicio de Publicaciones e Imagen Institucional ; Universidad de Burgos

ISBN: 978-84-18465-12-3

Year of publication: 2021

Pages: 675-684

Congress: Congreso de Ingeniería del Transporte (14. 2021. Burgos)

Type: Conference paper


The purpose of this research was to study the feasibility of incorporating steel slags into coarse bituminous mixtures. The objective was twofold: to reduce dependence on natural aggregates, and to provide a use for industrial by-products. The slags studied come from the manufacture of carbon steel in electric furnaces and are divided into two types: Electric Arc Furnace (EAF) slag and Ladle Furnace (LF) slag. The mixture designed is coarse bituminous concrete (AC22G), for base courses in flexible pavements. In a first phase, the physical characterization of the materials was carried out to check their suitability. In a second phase, three types of mixes were designed: a control mix (made with natural limestone aggregates), a mix where LF slag was introduced to replace the filler and the fine fraction (sand) of the mix; and finally, the feasibility of manufacturing a totally sustainable mix was analyzed, which would fully incorporate EAF slag as coarse aggregate and LF slag as fine aggregate and filler. In a third and final phase, the designed mixes were subjected to different mechanical, water sensitivity, and durability tests. The research demonstrated that the incorporation of EAF and LF steel slag as a substitute for natural aggregate in coarse bituminous mixtures is feasible, meeting regulatory requirements, improving sustainability in the construction industry, as well as reducing emissions, and contributing to climate change mitigation.