Evaluation of Properties and Performance Improvement Mechanism of Novel Waterborne Epoxy Modified Asphalt Emulsion with Styrene–Butadiene–Chloroprene Rubber
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 8
Abstract
This study aims to investigate the properties of novel waterborne epoxy modified asphalt emulsion with styrene–butadiene–chloroprene rubber (SBR/CR) and evaluate its performance improvement mechanism. To achieve this objective, Brookfield rotational viscometer tests and dynamic shear rheometer tests were first performed to characterize the rheological properties of new emulsion residues with time. Then, penetration, softening point, and ductility tests were adopted to evaluate the conventional performance of the new emulsion residue. Finally, the curing microstructures, functional group changes, and thermal stability of new emulsion were analyzed by using scanning electron microscopy, Fourier transform infrared spectrometry, thermal gravimetric analysis, and differential scanning calorimetry, respectively. The experimental results showed that the new emulsion residue showed an extremely high viscosity, and its viscosity value was more than 40 times that of general asphalt emulsion. The stiffness and thermal stability of new emulsion at high temperatures were significantly improved by crosslinking the epoxy system to form a three-dimensional polymer network. The incorporation of SBR/CR copolymer reduced the effect of waterborne epoxy cured products on the low-temperature elongation performance of new emulsion, resulting in improved thermal cracking resistance of the new emulsion system. The optimum dosage of waterborne epoxy for the new asphalt emulsion determined was 15% by weight of SBR/CR modified asphalt emulsion. Based on these results, it is evident that the waterborne epoxy asphalt emulsion together with the SBR/CR copolymer can form a durable emulsion system in both low- and high-temperature environments.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors sincerely acknowledge the funding support from the National Natural Science Foundation of China (Program No. 51878167) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_0125). The authors would like to thank the financial support to this research from the National Key R&D Program of China (Nos. 2018YFB1600300 and 2018YFB1600304).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 8 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
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Received: Aug 16, 2021
Accepted: Nov 23, 2021
Published online: May 28, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 28, 2022
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