|Table of Contents|

Performance and regeneration mechanism of bio-oil-based recycled asphalt by extraction method(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年2期
Page:
12-21
Research Field:
道路工程
Publishing date:

Info

Title:
Performance and regeneration mechanism of bio-oil-based recycled asphalt by extraction method
Author(s):
FENG Xin-jun;  FU Hao;  DUAN Hu-jie
(School of Traffic and Transportation Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China)
Keywords:
road engineering;  extraction-based bio-oil;  experimental research;  SW rejuvenator;  rejuvenated asphalt;  pavement performance;  regeneration mechanism
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2024.02.002
Abstract:
In order to study the feasibility of extraction-based bio-oil as a rejuvenator,extraction-based bio-oil-based rejuvenator(SW)was developed to prepare bio-oil-basedrejuvenated matrix asphalt and bio-oil-based regeneration SBS modified asphalt. Theperformances of the two rejuvenated asphalts were evaluated by conventional performance tests,dynamic shear rheology and bending beam rheology, and the regenerationmechanism of the two asphalts was analyzed by Fourier transform infrared spectroscopy and gel permeation chromatography. The results show that the three major indexes andviscosity of the aging matrix asphalt and the aging SBS modified asphalt with 8% and 10% content(mass fraction, the same below)SW rejuvenator agent are restored to the original asphalt level, respectively. Under the action of SW rejuvenator agent, the high-temperature stability of the aging matrix asphalt and the aging SBSmodified asphalt decreases significantly, the low-temperature cracking resistance increasessignificantly, and both of them can be restored to the original asphalt level. The SW rejuvenator agent mainly exists in the form of physical blending in the aging asphalt, but there are stillchemical reactions such as phenol-formaldehyde condensation and olefin oxidation cracking. TheSW rejuvenator agent is rich in light components, which has a significant diluting effect on theaging asphalt. The phenolic compounds contain in the asphalt binder can promote thetransformation of high molecular weight molecules into low molecular weight molecules, whichleads to the decrease of the contents of macromolecular substances and medium molecularweight substances, the increase of small molecular weight substances, and thedecrease of dispersion index, thereby improving the compatibility and molecular weightdistribution of the components of aging asphalt.5 tabs, 7 figs, 31 refs.

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Last Update: 2024-03-01