期刊
RESOURCES CONSERVATION AND RECYCLING
卷 187, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.resconrec.2022.106601
关键词
Sustainability; Phenol-rich bio-oil; Oxidative aging; Carbon-negative; Asphalt binder; Antioxidant
资金
- National Science Foundation [1935723]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1935723] Funding Source: National Science Foundation
This study investigated the impact of phenol-rich bio-oils on the durability of asphalt binder. The results showed that phenol-rich bio-oils can slow down the aging process of asphalt binder, and the antioxidant activity of bio-oils is mainly influenced by the content and molecular structures of their phenolic compounds.
This study examined the capability of phenol-rich bio-oils to improve the durability of bituminous composites by hindering oxidative aging in asphalt binder. Bio-oils derived from six wood-based bio-sources were introduced to asphalt binder, each specimen was then exposed to thermal aging. A chemical aging index was measured using Fourier-transform infrared spectroscopy, and a rheological aging index was measured using a dynamic shear rheometer. The results of the study showed that all phenol-rich bio-oils reduced the extent of aging in biomodified binder, however, the bio-oils' efficacy against aging varied, partly based on the content of their phenolic compounds. Computational modeling showed that the efficacy of each bio-oil is also affected by the molecular structures of its phenolic compounds, electron-donor substituents in the phenolic compound structure promote its antioxidant activity. The study outcomes show that using phenol-rich bio-oils can enhance the durability of asphalt binder while promoting a carbon-negative built environment.
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