Evaluation of Moisture Susceptibility and Chemistry of Recovered Asphalt Binders
Publication: Tran-SET 2022
ABSTRACT
Till today, moisture is the arch-nemesis of asphalt pavements causing stripping, rutting, potholes, and fatigue cracking. Moisture-induced damage is quite common in places, which experience heavy rainfall along with shallow groundwater levels. All these phenomena result in a premature pavement failure seeding nuisance to many state DOTs. Early failure requires unexpected budget allocation to maintain the road condition up to the standards. Thus, this study utilized sessile drop (SD), Fourier transform infrared (FTIR) spectroscopy, and the Texas boiling test to evaluate the moisture susceptibility and chemical signature of binders recovered from asphalt mixtures. Four plant mixes HMA 308-20, HMA 221-21, SMA PMLC, and Bmit PMLC were collected to achieve these study goals. SD test showed that water had the highest contact angle compared to two other probe liquids. Contact angles were lowest for HMA 308-20 and highest for Bmit PMLC. Surface free energy (SFE) was highest for HMA 308-20 and lowest for Bmit PMLC. FTIR test showed that the Bmit sample had an exclusive strong C=O stretching resulting from acid/aldehyde. Texas boiling test showed that all mixes demonstrated a very good percentage of asphalt retention (>80%). Further laboratory-based tests on mixes and recovered binder will be conducted to develop a stripping and moisture damage resistant mix design.
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Tran-SET 2022
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Published online: Dec 13, 2022
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