Author ORCID Identifier

https://orcid.org/0000-0002-8028-1935

Document Type

Report

Publication Date

Winter 2024

Abstract

Moisture-induced damage can be detrimental to asphalt pavements. The modified Lottman approach (AASHTO T 283) is used to evaluate the stripping susceptibility of mixtures in Oklahoma. There are concerns about the ability of the AASHTO 283 to predict moisture damage in the field. In this study, the AASHTO T 283, the moisture-induced stress tester (MiST), and the Hamburg wheel tracking (HWT) test are used to evaluate the moisture susceptibility of mixes prepared using different gradations, local aggregate sources, and binders sampled from different refineries in Oklahoma. The mixes were also tested for cracking and rutting using the indirect tensile asphalt cracking test (IDEAL-CT) and the HWT test, respectively. The results indicate that no direct correlation can be established between the different moisture sensitivity tests since they involve different failure mechanisms. The HWT test did not provide a good measure of the moisture susceptibility of mixes containing limestone aggregate, with low insoluble residue, due to their weak aggregate structure causing premature failure in rutting and early stripping. It was also shown that there was a correlation between the tensile strength ratio (TSR) from the MiST and the percentage change in volume, however, the MiST did not appear to result in a notable reduction in tensile strength in some cases where the TSR was either close to or higher than one. The binder grade appeared to be the most significant factor in the determination of the cracking resistance of the mix, i.e., cracking tolerance index (CTindex), while other factors such as the aggregate gradation, aggregate type, and binder content had a lesser effect on the CTindex. The binder grade had the most effect on the post-peak slope at 75% peak load while the gradation and the aggregate type had the most effect on the fracture energy and displacement at 75% peak load.

Comments

Tran-SET Project 22BOSU57

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