A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts

Authors

Ran Zhang, School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Zhanping You, Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA.
Jie Ji, School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Qingwen Shi, School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Zhi Suo, School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

Document Type

Article

Publication Date

8-28-2021

Department

Department of Civil, Environmental, and Geospatial Engineering

Abstract

Transforming waste biomass materials into bio-oils in order to partially substitute petroleum asphalt can reduce environmental pollution and fossil energy consumption and has economic benefits. The characteristics of bio-oils and their utilization as additives of asphalts are the focus of this review. First, physicochemical properties of various bio-oils are characterized. Then, conventional, rheological, and chemical properties of bio-oil modified asphalt binders are synthetically reviewed, as well as road performance of bio-oil modified asphalt mixtures. Finally, performance optimization is discussed for bio-asphalt binders and mixtures. This review indicates that bio-oils are highly complex materials that contain various compounds. Moreover, bio-oils are source-depending materials for which its properties vary with different sources. Most bio-oils have a favorable stimulus upon the low temperature performance of asphalt binders and mixtures but exhibit a negative impact on their high-temperature performance. Moreover, a large amount of oxygen element, oxygen-comprising functional groups, and light components in plant-based bio-oils result in higher sensitivity to ageing of bio-oil modified asphalts. In order to increase the performance of bio-asphalts, most research has been limited to adding additive agents to bio-asphalts; therefore, more reasonable optimization methods need to be proposed. Furthermore, upcoming exploration is also needed to identify reasonable evaluation indicators of bio-oils, modification mechanisms of bio-asphalts, and long-term performance tracking in field applications of bio-asphalts during pavement service life.

Publisher's Statement

© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Publisher’s version of record: https://doi.org/10.3390/molecules26165049

Publication Title

Molecules (Basel, Switzerland)

Recommended Citation

Zhang, R., You, Z., Ji, J., Shi, Q., & Suo, Z. (2021). A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts. Molecules (Basel, Switzerland), 26(16). http://doi.org/10.3390/molecules26165049
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/15305

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

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Publisher's PDF