Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates
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 resist...
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| Format: | Article |
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Elsevier
2015
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| Online Access: | https://eprints.nottingham.ac.uk/42779/ |
| _version_ | 1848796565673607168 |
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| author | Cuadri, A.A. Partal, P. Ahmad, N. Grenfell, J. Airey, G. |
| author_facet | Cuadri, A.A. Partal, P. Ahmad, N. Grenfell, J. Airey, G. |
| author_sort | Cuadri, A.A. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:50:00Z |
| format | Article |
| id | nottingham-42779 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:50:00Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-427792020-05-04T17:17:03Z https://eprints.nottingham.ac.uk/42779/ Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates Cuadri, A.A. Partal, P. Ahmad, N. Grenfell, J. Airey, G. 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. Elsevier 2015-09-15 Article PeerReviewed Cuadri, A.A., Partal, P., Ahmad, N., Grenfell, J. and Airey, G. (2015) Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates. Construction and Building Materials, 93 . pp. 766-774. ISSN 0950-0618 Asphalt mixtures; Moisture damage; Surface free energy; Bitumen chemical modification; Product design http://www.sciencedirect.com/science/article/pii/S095006181500611X doi:10.1016/j.conbuildmat.2015.05.098 doi:10.1016/j.conbuildmat.2015.05.098 |
| spellingShingle | Asphalt mixtures; Moisture damage; Surface free energy; Bitumen chemical modification; Product design Cuadri, A.A. Partal, P. Ahmad, N. Grenfell, J. Airey, G. Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title | Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title_full | Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title_fullStr | Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title_full_unstemmed | Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title_short | Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| title_sort | chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates |
| topic | Asphalt mixtures; Moisture damage; Surface free energy; Bitumen chemical modification; Product design |
| url | https://eprints.nottingham.ac.uk/42779/ https://eprints.nottingham.ac.uk/42779/ https://eprints.nottingham.ac.uk/42779/ |