Dissertation
DEVELOPMENT, ASSESSMENT, AND MODELING OF AN ANTI-ICING ASPHALT PAVEMENT
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000002448
Handle:
https://hdl.handle.net/2376/120757
Abstract
Asphalt pavement incorporating salt-storage additive (APSSA) is a type of effective anti-icing pavement used for winter road safety and mobility in cold regions. However, some limitations of conventional APSSA have been identified and are impeding its wider acceptance, including low anti-icing capacity, low anti-icing effectiveness, short anti-icing longevity, and reduced engineering properties of asphalt pavement. The research develops a novel type of functional additives for anti-icing asphalt pavement, to improve the anti-icing capacity and effectiveness and extend the anti-icing longevity. A hypothesis is proposed that the microporous surface structure of the additives could benefit the engineering properties through the interaction between asphalt binder and the salt-encapsulating material – epoxy resin. In addition, the customized design aimed to achieve a performance balance among anti-icing effectiveness and engineering properties.
The laboratory study revealed that an asphalt pavement with 5.1% functional additives (by weight of asphalt mixture) features an excellent anti-icing capacity, low-temperature anti-icing effectiveness, and superior anti-icing longevity. Meanwhile, this pavement presents enhanced resistance to rutting, fatigue cracking, and thermal cracking, relative to its conventional asphalt pavement counterpart. The incorporation of 5.1 wt% functional additives showed limited effects on the moisture susceptibility of asphalt mixture, whereas the incorporation of 15.1 wt% functional additives increased the moisture susceptibility and this risk could be compensated by nanomodification of the binder (4 wt% montmorillonite nanoclay). Scanning electron microscopy analysis (SEM), Fourier transform infrared spectrometry (FTIR) analysis, and differential scanning calorimetry (DSC) were employed to shed light on why the pavement has a superior anti-icing longevity and improved engineering properties and durability performances.
This work also pioneers a numerical simulation to predict the anti-icing longevity of a thin overlay of APSSA under a comprehensive consideration of influential factors (using an Interstate highway near Pullman, WA as case study). The COMSOL Multiphysics software (a Finite Element Method software) was employed to develop the predictive model, based on some parameters obtained from laboratory experiments, data from literature, and some assumptions. The model serves to provide a fundamental understanding of water and chloride transport in the pavement, enabling an estimation of its “effective anti-icing life” under the given service environment.
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Details
- Title
- DEVELOPMENT, ASSESSMENT, AND MODELING OF AN ANTI-ICING ASPHALT PAVEMENT
- Creators
- Yan Zhang
- Contributors
- Xianming Shi (Advisor)Xianming Shi (Committee Member)Haifang Wen (Committee Member)Ji Yun Lee (Committee Member)Kun Zhang (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 201
- Identifiers
- 99900606855301842
- Language
- English
- Resource Type
- Dissertation