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Journal of Materials Science

, Volume 49, Issue 22, pp 7723–7729 | Cite as

Bitumen spreading on calcareous aggregates at high temperature

  • Felipe Guerrero-BarbaII
  • Miguel A. Cabrerizo-Vílchez
  • Miguel A. Rodríguez-Valverde
Original Paper

Abstract

In hot asphalt applications, the adhesion between bitumen and mineral aggregate is usually described in terms of bitumen surface tension and contact angle of the bitumen over the aggregate. However, the quantification of the physico-chemical bond between bitumen and aggregate under realistic conditions is a nontrivial task. In this work, we designed a high-temperature goniometer to measure the contact angle of liquid bitumen on mineral aggregate substrates. The drop deposition was conducted once the thermal equilibrium between liquid bitumen and aggregate was attained. We monitored the spreading of sessile drops of viscous naphthenic bitumen and asphaltic bitumen on polished sheets of calcareous aggregates at high temperature (70–100 °C). A near complete wetting with very low contact angles (13–\(24^{\circ }\)) was reproduced regardless of the bitumen origin and temperature. Furthermore, the coating degree of the naphthenic and asphaltic bitumens on the calcareous aggregates at high temperature was apparently similar. We found that the bitumen-aggregate adhesion is adequately described by dynamic spreading rather than by equilibrium wettability. Spreading kinetics was ruled by the particular properties of each bitumen such as viscosity and acid index. We found evidences of acid etching of the naphthenic bitumen on the calcareous aggregates during spreading at high temperature.

Keywords

Contact Angle Asphalt Bitumen Sessile Drop Asphalt Mixture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the Ministerio Español de Ciencia e Innovacion (project MAT2011-23339) and the Junta de Andalucia (projects P09-FQM-4698 and P12-FQM-1443). The authors thank Dr. Didier Lesueur for fruitful scientific discussion.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Felipe Guerrero-BarbaII
    • 1
  • Miguel A. Cabrerizo-Vílchez
    • 1
  • Miguel A. Rodríguez-Valverde
    • 1
  1. 1.Applied Physics Department, Faculty of Sciences, Biocolloid and Fluid Physics GroupUniversity of GranadaGranadaSpain

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