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Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates

Cuadri, A.A.; Partal, P.; Ahmad, N.; Grenfell, J.; Airey, G.


A.A. Cuadri

P. Partal

N. Ahmad

J. Grenfell

Professor of Pavement Engineering Materials


Moisture damage is one of the major premature failures that worsens the performance and shortens service life of pavements. This research assesses the effect that two chemical modifiers (thiourea and an isocyanate-functionalized castor oil prepolymer) exerts on the bitumen rheology and on the resistance to potential moisture damage of asphalt mixtures based on siliceous aggregates. Both thiourea and the isocyanate-based prepolymer improve the viscous and viscoelastic behaviours of bitumen at high in-service temperatures, particularly the isocyanate-based reactive modifier. Likewise, the visual inspection of the degree of bitumen coating on loose mixtures exposed to water in a “rolling bottle” test, and further surface free energy measurements, showed that the bitumen modification by the isocyanate-based prepolymer seems to reduce moisture-induced damage on siliceous aggregates. Conversely, thiourea-based modification increases sensitivity of the bitumen–aggregate mixture to water. Different adhesion mechanisms, based on chemical or physical bonds with the aggregate surface, have been proposed for each modifier.


Cuadri, A., Partal, P., Ahmad, N., Grenfell, J., & Airey, G. (2015). Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates. Construction and Building Materials, 93, doi:10.1016/j.conbuildmat.2015.05.098

Journal Article Type Article
Acceptance Date May 1, 2015
Online Publication Date May 23, 2015
Publication Date Sep 15, 2015
Deposit Date May 11, 2017
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 0950-0618
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 93
Keywords Asphalt mixtures; Moisture damage; Surface free energy; Bitumen chemical modification; Product design
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