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Appl. Sci. 2017, 7(11), 1155; doi:10.3390/app7111155

Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue

1
School of Civil Engineering and Transportation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
3
Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA
4
China Academy of Railway Sciences, Railway Engineering Research Institute, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Received: 3 October 2017 / Revised: 31 October 2017 / Accepted: 3 November 2017 / Published: 10 November 2017
(This article belongs to the Section Materials)
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Abstract

This paper aims to study the preparation and viscoelastic properties of asphalt binder modified by tetrahydrofuran soluble fraction (THFS) extracted from direct coal liquefaction residue. The modified asphalt binders, which blended with SK-90 (control asphalt binder) and 4%, 6%, 8% and 10% THFS (by weight of SK-90), were fabricated. The preparation process for asphalt binder was optimized in terms of the orthogonal array test strategy and gray correlation analysis results. The properties of asphalt binder were measured by applying Penetration performance grade and Superpave performance grade specifications. In addition, the temperature step and frequency sweep test in Dynamic Shear Rheometer were conducted to predict the rheological behavior, temperature and frequency susceptibility of asphalt binder. The test results suggested the optimal preparation process, such as 150 °C shearing temperature, 45 min shearing time and 4000 rpm shearing rate. Subsequently, the addition of THFS was beneficial in increasing the high-temperature properties but decreased the low-temperature properties and resistance to fatigue. The content analysis of THFS showed the percentage of 4~6% achieved a balance in the high-and-low temperature properties of asphalt binder. The asphalt binder with higher THFS content exhibited higher resistance to rutting and less sensitivity to frequency and temperature. View Full-Text
Keywords: direct coal liquefaction residue; tetrahydrofuran soluble fraction; THFS; preparation process; viscoelastic properties; temperature susceptibility; frequency susceptibility direct coal liquefaction residue; tetrahydrofuran soluble fraction; THFS; preparation process; viscoelastic properties; temperature susceptibility; frequency susceptibility
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ji, J.; Yao, H.; Zheng, W.; Suo, Z.; Shi, Y.; Xu, Y.; Wu, H.; You, Z. Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue. Appl. Sci. 2017, 7, 1155.

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