The aim of this study was to characterize the chemical, molecular, and rheological properties of different asphalt emulsions including a newly introduced tire-rubber modified asphalt emulsion (CRS-2TR). Three emulsions (CRS-2TR, CRS-2P, and CRS-2) and one asphalt rubber binder (AC20-5TR) were evaluated in this study. The superpave performance grade (PG), surface performance grade (SPG), and the multiple stress creep recovery (MSCR) test were conducted to evaluate the rheological properties of the binder residues. Evaluation of the differences in the functional groups, molecular weight distribution, and chemical composition of the asphalt binder residues was conducted using Fourier transform infrared spectroscopy (FTIR), high-pressure gel permeation chromatography (HP-GPC), and saturates, aromatics, resins and asphaltenes (SARA) fractionation, respectively. The chemical and molecular characterization test results indicated that the tire-rubber modified emulsion had lower carbonyl indices and colloidal instability indices as compared to the other conventional emulsions, indicating a higher resistance to aging. On the other hand, the rheological test results showed that the performance of CRS-2TR was comparable to CRS-2P and was expected to perform better than CRS-2. In addition, the moisture susceptibility of the binder residues from the bitumen bond strength (BBS) test showed that CRS-2TR had a greater pull-off tensile strength in both dry and wet conditions as compared to CRS-2 and had statistically equal performance results as compared to CRS-2P.
Rheological and Molecular Characterizations of Tire Rubber Modified Asphalt Emulsion
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2674 , 3 ; 12-26
2020-02-02
Article (Journal)
Electronic Resource
English
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