Effect of bio-oil on low-intermediate temperature properties of organosolv lignin-bitumen

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Abstract

Lignin, one of the most abundant natural polymers, has been extensively studied as liquid or solid additive in bituminous binders. Despite the fact the organosolv lignin in bitumen improves the overall resistance against oxidative aging, lignin could lead to binders of high thermal cracking sensitivity. In this study, a bio-based oil is implemented in a lignin modified bitumen to ameliorate characteristics, such as fatigue and thermal cracking resistance. Pressure aging vessel conditioning was applied to new binders formulated by different proportions of bio-oil to simulate the long-term aging. A series of rheological tests were performed. Based on the linear amplitude sweep test results, fatigue damage of lignin-bitumen could be reduced by increasing the oil content. According to relaxation test results, the addition of oil significantly decreased the ratio of residual stress and relaxation time. This study has shown preliminary conclusions on the use of bio-oil to improve the low-intermediate temperature performance of lignin-bitumen binders.

Original languageEnglish
Title of host publicationFunctional Pavements - Proceedings of the 6th Chinese-European Workshop on Functional Pavement Design, CEW 2020
EditorsXianhua Chen, Jun Yang, Markus Oeser, Haopeng Wang
PublisherCRC Press / Balkema - Taylor & Francis Group
Pages26-30
Number of pages5
ISBN (Electronic)9780367726102
DOIs
Publication statusPublished - 2021
Event6th Chinese-European Workshop on Functional Pavement Design, CEW 2020 - Virtual, Online, China
Duration: 18 Oct 202021 Oct 2020

Publication series

NameFunctional Pavements - Proceedings of the 6th Chinese-European Workshop on Functional Pavement Design, CEW 2020

Conference

Conference6th Chinese-European Workshop on Functional Pavement Design, CEW 2020
CountryChina
CityVirtual, Online
Period18/10/2021/10/20

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