Modifying Surface Properties of Model and Pavement Aggregates with Silanes

  • Gabriel OrozcoEmail author
  • Cédric Sauzéat
  • Jules Galipaud
  • Hervé Di Benedetto
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 20)


Adhesion between binder and aggregate is a major concern when studying bituminous mixtures’ mechanical performances. Many parameters are to be taken into account, for instance chemical composition of binder and aggregate, interface roughness, etc. Isolating each parameter for a comprehensive approach of adhesion phenomenon can be very challenging but necessary. This paper is a first step of a larger study to isolate the role of surface chemical properties of aggregates in binder/aggregate interface. In order to alter only the very surface of aggregate and its chemical composition, a simple 3-step-procedure for chemical surface modification at molecular scale using two different hydrophobic organosilanes is given. Two substrates proposed here are made of classical rock (microdiorite) for pavement construction from a French quarry, and of glass as model material. The change of physicochemical properties of modified substrates is then assessed through contact angle method on smooth plates, while the nano-coating’s composition is assessed with X-Ray Photoelectron Spectroscopy (XPS) on aggregates. Contact angle method significantly revealed hydrophobic properties for both modified substrates, up to a 30 degrees’ increase. XPS analysis show that the coating is a success on both substrates, and probably with a strong siloxane bond.


Surface modification Organosilane XPS Contact angle Adhesion 



The authors thank Eiffage Route company and the Eiffage/ENTPE industrial chair for providing support and resources that helped to carry out this research.


  1. Adams, R.D.: Adhesive Bonding. W.P. Limited, Ed. (2005)Google Scholar
  2. Arkles, B.: Tailoring surfaces with silanes. In Chemtech (Ed.) (1977)Google Scholar
  3. Arkles, B.: Hydrophobicity, hydrophilicity and silane surface modification (Gelest, Inc.) (2011)Google Scholar
  4. Baldi-Sevilla, A., et al.: Influence of bitumen and aggregate polarity on interfacial adhesion. Road Mater. Pavement Des. 18, 304–317 (2017)CrossRefGoogle Scholar
  5. Boulangé, L., Bonin, E., Saubot, M.: Physicochemical characterisations of the bitumen–aggregate interface to get a better understanding of stripping phenomena. Road Mater. Pavement Des. 14, 384–403 (2013)CrossRefGoogle Scholar
  6. Canestari, F., Cardone, F., Graziani, A., Santagata, F.A., Bahia, H.U.: Adhesive and cohesive properties of asphalt-aggregate systems subjected to moisture damage. Road Mater. Pavement Des. 1(Special Issue 1), 11–32 (2010)CrossRefGoogle Scholar
  7. Corté, J.-F., Di Benedetto, H.: Matériaux Routiers Bitumineux (Lavoisier – Hermès) (2004)Google Scholar
  8. Hefer, A., Little, D.: Adhesion in bitumen-aggregate systems and quantification of the effects of water on the adhesive bond. Technical report, International Center for Aggregate Research (2005)Google Scholar
  9. Min, Y., et al.: Surface modification of basalt with silane coupling agent on asphalt mixture moisture damage. Appl. Surf. Sci. 346, 497–502 (2015)Google Scholar
  10. Packham, D.E.: Handbook of adhesion. Wiley (ed.) (1992)Google Scholar
  11. Plueddemann, E.P.: Silane Coupling Agents. Springer, New York (1991)CrossRefGoogle Scholar
  12. Vassaux, S., et al.: Towards a better understanding of wetting regimes at the interface asphalt/aggregate during warm-mix process of asphalt mixtures. Constr. Build. Mater. 133, 182–195 (2017)CrossRefGoogle Scholar

Copyright information

© RILEM 2019

Authors and Affiliations

  • Gabriel Orozco
    • 1
    Email author
  • Cédric Sauzéat
    • 1
  • Jules Galipaud
    • 2
  • Hervé Di Benedetto
    • 1
  1. 1.Université de Lyon, ENTPE, LTDS (CNRS UMR 5513)LyonFrance
  2. 2.Université de Lyon, Ecole Centrale de Lyon, LTDS (CNRS UMR 5513)LyonFrance

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