TY - JOUR
T1 - Decoupling oxidation and hardening in ageing
T2 - evaluation of bitumen-stone adhesion using different experimental methods
AU - Zhou, Lu
AU - Airey, Gordon
AU - Zhang, Yuqing
AU - Wang, Chonghui
N1 - Publisher Copyright:
© 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
PY - 2025
Y1 - 2025
N2 - The adhesion at the bitumen-aggregate interface critically affects asphalt pavement resistance to moisture damage and cracking and is significantly influenced by the bitumen ageing process. Coupled oxidation and hardening during ageing lead to varying results across evaluation methods. This study employs direct tensile pull-off tests at iso-temperature and iso-stiffness conditions, contact angle tests, and boiling water tests to assess bitumen-stone adhesion at different ageing levels. Results indicate oxidation and hardening have dual impacts: short-term ageing initially enhances adhesion, while prolonged ageing reduces it significantly. Polymer-modified bitumen shows improved ageing resistance due to delayed polymer degradation. Iso-temperature tests fail to clearly differentiate oxidation from hardening effects, whereas iso-stiffness tests offer more accurate assessments by excluding physical hardening. Due to interactions between chemical and physical changes in bitumen, ageing evaluations vary by indices and binder type. A comprehensive assessment combining pull-off tensile tests, surface free energy analysis, and mixture-scale evaluations is recommended.
AB - The adhesion at the bitumen-aggregate interface critically affects asphalt pavement resistance to moisture damage and cracking and is significantly influenced by the bitumen ageing process. Coupled oxidation and hardening during ageing lead to varying results across evaluation methods. This study employs direct tensile pull-off tests at iso-temperature and iso-stiffness conditions, contact angle tests, and boiling water tests to assess bitumen-stone adhesion at different ageing levels. Results indicate oxidation and hardening have dual impacts: short-term ageing initially enhances adhesion, while prolonged ageing reduces it significantly. Polymer-modified bitumen shows improved ageing resistance due to delayed polymer degradation. Iso-temperature tests fail to clearly differentiate oxidation from hardening effects, whereas iso-stiffness tests offer more accurate assessments by excluding physical hardening. Due to interactions between chemical and physical changes in bitumen, ageing evaluations vary by indices and binder type. A comprehensive assessment combining pull-off tensile tests, surface free energy analysis, and mixture-scale evaluations is recommended.
KW - Adhesion properties
KW - ageing effect
KW - experimental evaluation
KW - hardening effect
UR - https://www.scopus.com/pages/publications/105002118761
U2 - 10.1080/14680629.2025.2486525
DO - 10.1080/14680629.2025.2486525
M3 - Article
AN - SCOPUS:105002118761
SN - 1468-0629
VL - 26
SP - 734
EP - 750
JO - Road Materials and Pavement Design
JF - Road Materials and Pavement Design
IS - sup1
ER -