ORIGINAL RESEARCH article
Front. Built Environ.
Sec. Transportation and Transit Systems
Volume 11 - 2025 | doi: 10.3389/fbuil.2025.1619524
This article is part of the Research TopicAdvancements and Applications of Balanced Mix Design (BMD) In Asphalt Pavement Engineering: Towards Sustainable And Resilient InfrastructureView all articles
Rheological Properties Study of High-viscosity Asphalt Based on Direct Coal Liquefaction Residue
Provisionally accepted
- 1China Shenhua Coal to Liquid and Chemical Co., Ltd, Inner Mongolia, China
- 2Inner Mongolia Agricultural University, Hohhot, China
- 3Erdos Lutai Highway Engineering Co., Ltd, Inner Mongolia, China
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Direct coal liquefaction residue (DCLR), a byproduct of the coal-to-oil process, poses a significant challenge for resource recycling and high-value utilization. This study developed a high-viscosity asphalt material based on DCLR. Through systematic optimization experiments of the composite system, the effects of key components on critical performance parameters were systematically investigated. The optimal formula was determined as 6% Styrene-Butadiene-Styrene block copolymer (SBS) + 5% DCLR + 3% Dibutyl phthalate (DBP) + 10% rubber powder + 4% aromatics oil + 0.15% stabilizer. Performance tests showed that the rutting factor of the DCLR high-viscosity asphalt was 59.8% higher than that of the LT high-viscosity asphalt, and the G*/sinδ value after Rolling Thin Film Oven Test (RTFOT) aging had the smallest increase, confirming its excellent high-temperature rut resistance and resistance to short-term aging. The zero-shear viscosity (ZSV) values obtained by fitting the Carreau model indicated that within the temperature range of 46-64℃, the ZSV values of the DCLR modified asphalt were 1-2 orders of magnitude higher than those of the control samples, and the asphalt still maintained stable viscoelasticity at high temperatures (>64℃), demonstrating its outstanding interfacial bonding performance. The bending beam rheometer (BBR) test results showed that the creep stiffness modulus of the three asphalts decreased while the creep rate increased, and the creep stiffness and creep rate had an approximate exponential relationship with temperature. Under the same temperature conditions, the stiffness modulus and creep rate of the DCLR high-viscosity asphalt were not significantly different from those of the Lutai (LT) highviscosity asphalt, indicating its relatively good low-temperature crack resistance. Fluorescence microscopy results revealed that the DCLR system formed a stable three-dimensional colloidal skeleton structure between the modifier molecules and the asphaltenes, which is the fundamental reason for its superior performance and low-temperature properties compared to the LT highviscosity asphalt.
Keywords: DCLR high-viscosity asphalt, Optimal formula, Rutting factor, Zero-shear viscosity, fluorescence microscopy
Received: 28 Apr 2025; Accepted: 09 Jun 2025.
Copyright: © 2025 Liu, Wang, Ru, Li, Li and Gao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Yongxiang Li, Inner Mongolia Agricultural University, Hohhot, China
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