Evaluation of benzaldehyd and dioctyl phthalate modified direct coal liquefaction residue asphalt binder based on rheology and microscopic mechanisms

Jie Ji; Tong Ma; Ziyuan Zhang; Meng Ling; Xinqiang Xu; Jianming Wei

Cleaner Materials (Jun 2024)

Evaluation of benzaldehyd and dioctyl phthalate modified direct coal liquefaction residue asphalt binder based on rheology and microscopic mechanisms

Jie Ji,
Tong Ma,
Ziyuan Zhang,
Meng Ling,
Xinqiang Xu,
Jianming Wei

Affiliations

Jie Ji: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing 100044, China; Beijing University of Civil Engineering and Architecture, Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing 100044,China; Engineering Technology Innovation Center for Construction Waste Recycling, Ministry of Housing and Urban-Rural Development, Beijing 100044, China; Corresponding author.
Tong Ma: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing 100044, China; Beijing University of Civil Engineering and Architecture, Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing 100044,China
Ziyuan Zhang: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing 100044, China; Beijing University of Civil Engineering and Architecture, Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing 100044,China
Meng Ling: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing 100044, China; Beijing University of Civil Engineering and Architecture, Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing 100044,China
Xinqiang Xu: Ningxia Communications Construction Co., Ltd, Yinchuan, Ningxia 750004, China
Jianming Wei: National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China

Journal volume & issue: Vol. 12
p. 100238

Abstract

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This study intends to investigate the influence of benzaldehyde and dioctyl phthalate (DOP) on the rheological properties and microstructure of direct coal liquefaction residue (DCLR) modified asphalt binder. The high and low temperature rheological properties and fatigue properties were obtained by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) tests were conducted to evaluate the mechanism of property improvement in the DCLR modified asphalt binder. The results showed that the addition of DCLR increased the complex shear modulus G*, rutting factor G*/sin δ and fatigue life Nf of base asphalt binder, significantly improving the high temperature deformation resistance and fatigue resistance of base asphalt binder. This was attributed to the hardening effect resulting from the addition of DCLR, which enhanced the elastic properties, weakened the viscous properties and fluidity of asphalt binder. Additionally, the use of benzaldehyde and DOP reduced the creep stiffness S and lower continuous grading temperature Tc of DCLR modified asphalt binder, which compensated for the shortcomings of low temperature rheological properties of asphalt binder. The SEM images indicated that benzaldehyde and DOP significantly increased the compatibility of DCLR with the base asphalt binder. The FTIR tests showed that the addition of benzaldehyde and DOP introduced the aldehyde and ester groups, which were interacted with more polar functional groups in the asphalt to reduce the resistance to movement between the heavy components in the DCLR modified asphalt binder, which promoted the flow of asphalt and the dispersion of DCLR, and as a result, the benzaldehyde and DOP modified DCLR asphalt binder exhibited satisfied rheological properties.

Published in Cleaner Materials

ISSN: 2772-3976 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/cleaner-materials

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