Study on Flame Retardant Performance of Modified Asphalt Based on Functional Groups and Thermogravimetric Analysis
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 3
Abstract
In order to clarify the flame retardant mechanism and microscopic performance of modified asphalt, a new inorganic flame retardant was prepared using three flame retardants, and antimony trioxide and decabromodiphenyl oxide were selected for comparative testing. Twelve groups of asphalt samples were prepared as research materials, including eight groups of short-term and long-term aging samples. The effects of different types of flame retardants on the performance of modified asphalt were compared by macroscopic performance test, infrared spectroscopy and thermogravimetric analysis. The changes in functional groups of asphalt samples before and after aging were studied. The mass loss before and after aging was analyzed, and the flame retardant modes of various types of flame retardants were explored. The results showed that the functional groups of asphalt were not altered by the inorganic flame retardant and antimony trioxide. Both flame retardants were physically mixed with the modified asphalt. The hydrogen ions in the unsaturated bond C═C were partially replaced by bromine ions of decabromodiphenyl oxide, indicating that a chemical reaction occurred. The basic properties of modified asphalt were well maintained by the inorganic flame retardant; the formation of carbonyl groups was reduced, and the oxidation reaction during aging was also alleviated. In the combustion of inorganic flame retardants and decabromodiphenyl oxide, gas molecules were decomposed, oxygen concentration was reduced, and oxide-coated asphalt was formed. In contrast, only oxide-coated asphalt was formed in the combustion of antimony trioxide. Therefore, the study provides an approach to improve the aging resistance and pavement performance of flame retardant–modified asphalt, and also demonstrates its potential for practical applications.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to gratefully acknowledge the financial support from Tianjin Transportation Science and Technology Development Plan (No. 2022-08), National Natural Science Fund Project (No. 52108333), Shandong Transportation Science and Technology Plan (No. 2022B16), Natural Science Foundation of Shandong Province (No. ZR2021ME104), Scientific Research Project of Tianjin Education Commission (No. 2022ZD003), Science and Technology Major Project of China Railway Construction Corporation Limited (No. 2020-A01), Tianjin Research Innovation Project for Postgraduate Students (Nos. 2022SKYZ320, 2022SKYZ366, and 2022SKYZ176), Department of Science and Technology of Shaanxi Province Focused on Research and Development of General Project Industrial Field (No. 2020GY318), and Gansu Key Research and Development Program-Industrial Projects under Grant (No. 23YFGA0038).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 3 • March 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 7, 2023
Accepted: Aug 31, 2023
Published online: Dec 29, 2023
Published in print: Mar 1, 2024
Discussion open until: May 29, 2024
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