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Preparation, Properties, and Interaction Mechanism of High-Ratio DCLR-Modified Asphalt
Lei Xia1,2, Qidong Su2, Jian Liu3
1School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China.
Materials (Basel, Switzerland)
|May 7, 2025
Summary
Direct coal liquefaction residue (DCLR) enhances asphalt pavement
Area of Science:
- Materials Science
- Chemical Engineering
- Road Engineering
Background:
- Direct coal liquefaction residue (DCLR) faces challenges in high-value utilization in asphalt pavement due to complex pretreatment and unclear interaction mechanisms.
- Current applications of DCLR in asphalt are limited by low-dosage requirements.
- Understanding the multi-scale interactions between high-proportion DCLR and asphalt is crucial for improving its use in road construction.
Purpose of the Study:
- To analyze the molecular composition and structural characteristics of DCLR and its modified asphalt at multiple scales.
- To evaluate the performance of high-proportion DCLR-modified asphalt and compare it with Buton rock asphalt (BRA)-modified asphalt.
- To elucidate the interaction mechanisms between DCLR and asphalt and propose a novel application strategy.
Main Methods:
- Fourier Transform Infrared Spectroscopy (FTIR)
- Gel Permeation Chromatography (GPC)
- Scanning Electron Microscopy (SEM)
- Brunauer–Emmett–Teller (BET) analysis
- Temperature-programmed FTIR (Tg-FTIR)
- X-ray Diffraction (XRD)
- Conventional and rheological property testing
- Four-component analysis
- Elemental analysis
Main Results:
- DCLR significantly improved the high-temperature performance and PG grade of base asphalt, meeting high-modulus asphalt requirements.
- Both DCLR and BRA reduced the low-temperature performance of asphalt.
- DCLR showed a more pronounced enhancement in high-temperature performance and reduction in low-temperature performance compared to BRA at equivalent dosages.
- Interfacial physical, chemical, and mechanical behaviors between DCLR and asphalt were characterized.
Conclusions:
- High-proportion DCLR can be effectively utilized in asphalt pavement, enhancing high-temperature performance.
- The study elucidated the interaction mechanisms between DCLR and asphalt, paving the way for optimized use.
- A novel application strategy for DCLR in asphalt was proposed, significantly increasing its resource utilization rate in road engineering.
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