Investigation of the Release and Self-Healing Properties of Calcium Alginate Capsules in Asphalt Concrete under Cyclic Compression Loading
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 1
Abstract
Calcium alginate capsule encapsulating rejuvenators are a new approach to enhance the self-healing property of asphalt, but the release and self-healing properties of calcium alginate capsules in asphalt concrete under cyclic loading conditions are still unclear. In this research, calcium alginate capsule encapsulating sunflower oil as a repair agent was synthesized and the oil release ratios of the capsules in asphalt concrete after compression loading were determined through a Fourier transform infrared test (FTIR). Then, strength and fracture recovery tests and DSR test were conducted to evaluate the effects of the released oil on the healing levels and rheological properties of asphalt concrete. Finally, computed tomography (CT) scan and SEM tests were conducted to study the morphology of the capsules to analyze the oil release mechanism of calcium alginate capsules. The test results showed that with the increase of the compression loading cycles, more oil was released from the capsules and the self-healing level of the asphalt concrete increased obviously. In addition, the oil released from the capsules softened the asphalt, decreasing the complex modulus and increasing the phase angle of the asphalt. CT scan images showed that after compression loading and healing, the capsules deformed slightly but maintained their spherical shape, indicating that the capsules could release the oil from the cavities due to shrinking and deformation upon compression loading and restore their original shape after compression loading.
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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 gratefully acknowledge the financial support provided by the National Key R&D Program of China (No. 2018YFB1600200) and the National Natural Science Foundation of China (No. 51978547).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 26, 2020
Accepted: Jun 26, 2020
Published online: Oct 19, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 19, 2021
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