Low-Temperature Performance Improvement Measures for Emulsified Asphalt Cold Recycled Mixture: A Comparative Study
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
With the application of cold recycling technology in cold seasons or northern regions, suitable low-temperature performance evaluation methods and low-temperature performance improvement measures of a cold recycled mixture (CRM) became very topical. This study attempts to clarify the manufacturing process of low-temperature beam specimens by simulating the secondary thermal compaction of the overlying hot mix asphalt mixture layer. Next, the applicability of indirect tensile tests, low-temperature bend tests, and SCB tests to low-temperature performance evaluation of CRM is evaluated. The low-temperature improvement measures of emulsified asphalt CRM are analyzed, showing that “primary rolling for 24 times + secondary rolling for 12 times” of the low-temperature beam specimens conforms to the field compaction state of the CRM layer. The low-temperature performance of CRM under different design schemes can be characterized by the fracture work in the indirect tensile tests and fracture energy in the SCB tests. Compared with the ordinary emulsified asphalt CRM, the mixture design scheme of “3% latex regenerant” can significantly improve the low-temperature performance of CRM. The lower the temperature, the more pronounced the improvement effect. Considering that the low-temperature performance of CRM meets the road requirements, the design scheme of “3% latex regenerant” is recommended, while the “3% latex” scheme is the most cost-effective.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was financially supported by the Natural Science Foundation of China (Grants Nos. 51978521 and 51778483). The sponsorships are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 10, 2022
Accepted: Aug 12, 2022
Published online: Mar 20, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 20, 2023
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Cited by
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