Abstract
Accurately assessing asphalt mixtures' moisture susceptibility is critical because moisture damage can significantly reduce pavement durability, leading to premature failure and structural integrity of the pavement. The stripping inflection point (SIP), a moisture susceptibility index derived from the Hamburg Wheel Track (HWT) test, has practical merits in evaluating moisture susceptibility. However, current methods for determining the SIP showed low accuracy and high variability due to poor regression quality. Hence, this study aims to propose an improved method for calculating the SIP by modifying existing approaches to better capture the characteristics of rutting curves. Typical asphalt mixtures were used to conduct moisture susceptibility tests. Results from the TSR (T283) test and the Moisture Induced Stress Tester (M.i.S.T) test were used to verify the effectiveness of SIP. Results showed that the proposed model provided a better fit than existing models due to its ability to identify steep upturn tails, and it yielded more reasonable SIP values with much lower variability. In addition, SIP results based on the improved method exhibited a significant correlation with the results from M.i.S.T method, suggesting a promising approach for evaluating the moisture susceptibility of mixtures under field conditions. It is noted that a significant discrepancy was observed between the recommended SIP threshold and existing SIP limits. This indicates the necessity of further assessing the evaluation methods for the moisture susceptibility of mixtures.
Recommended Citation
P. Jiang et al., "An Improved Method to Calculate Stripping Inflection Point (SIP) and its Application in Evaluating Moisture Susceptibility of Asphalt Mixtures," Construction and Building Materials, vol. 492, article no. 142851, Elsevier, Sep 2025.
The definitive version is available at https://doi.org/10.1016/j.conbuildmat.2025.142851
Department(s)
Civil, Architectural and Environmental Engineering
Publication Status
Full Text Access
Keywords and Phrases
Asphalt mixture; Hamburg Wheel Track; Moisture Induced Stress Tester; Moisture susceptibility; Stripping inflection point
International Standard Serial Number (ISSN)
0950-0618
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
19 Sep 2025
