Rheological Properties and Micromechanism of Warm-Mix Flame-Retardant Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
In this study, the influence of flame-retardant materials on the rheological properties of warm-mix asphalt was investigated. The rheological properties of base asphalt and styrene–butadiene–styrene-modified (SBS) asphalt modified with 2% Sasobit and flame-retardant materials, such as alumina trihydrate and organic montmorillonite (OMMT) in a proportion of 3:1 (AM), were systematically explored. The investigation was carried out under three dosages of AM; i.e., 4%, 8%, and 12%. Experiments including dynamic shear rheological tests, multiple stress creep recovery tests, bending beam rheometer tests, Fourier transform infrared (FTIR) spectroscopy tests, gel permeation chromatography (GPC) tests, and fluorescence microscopy (FM) tests were conducted to evaluate the rheological properties and micromechanism of warm-mix flame-retardant asphalt under different AM dosages. The results showed that the rheological properties of warm-mix flame-retardant SBS asphalt (SOA) at high and low temperatures were better than those of warm-mix flame-retardant asphalt (POA) at the same AM dosage. The increase in AM dosage improved the high-temperature rheological properties and decreased the low-temperature rheological properties. Based on the combined analysis of FTIR spectroscopy, GPC results, and FM results, the reason for this phenomenon was speculated to be the occurrence of wax-crystal structure and filler–asphalt interaction between asphalt and AM. Furthermore, organic cations in OMMT adsorbed the lightweight components present in asphalt, which reduced their proportion and improved the high-temperature and rheological properties. Moreover, the increase in AM led to the increase in physical volume filling, which increased the mechanical properties and brittleness of asphalt. The stress concentration led to the worsening of the stress-diffusion capacity of POA and SOA and eventually led to the decrease in the low-temperature rheological properties of POA and SOA.
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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 greatly acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51908194), the Guangxi Key Research and Development program (GuikeAB20297033 and GuikeAB17292032), the Jiangxi province Key Research and Development program (Grant No. 20192BBG70080), and the China Postdoctoral Science Foundation Project (Grant No. 2019M650101).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 10, 2023
Accepted: Jan 23, 2024
Published online: Jun 17, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 17, 2024
ASCE Technical Topics:
- Disaster risk management
- Disasters and hazards
- Dynamic tests
- Engineering fundamentals
- Engineering materials (by type)
- Fires
- Laboratory tests
- Man-made disasters
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Materials processing
- Measurement (by type)
- Rheology
- Rubber
- Temperature effects
- Temperature measurement
- Tests (by type)
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