Rheological and Chemical Characteristics of Asphalt Binder Modified with Groundnut Shell Bio-oil

Increase in the asphalt binder prices, dwindling crude oil resources, and an enhanced obligation for environmentally sustainable asphalt binder necessitates the exploration of alternate avenues. One such promising approach is the adoption of bio-oil (BO) from biomasses for the production of asphalt binder. This study adopts BO derived from groundnut shell biomass (by fast pyrolysis) for modification of AC30. BO was incorporated in AC30 at varying dosages of 5, 10, and 15 % by weight. The tests performed included carbon, hydrogen, nitrogen, sulfur, and oxygen; Fourier transform infrared (FTIR) spectroscopy; absolute viscosity; softening point; dynamic viscosity; frequency sweep at multiple temperatures; performance grade (PG); multiple stress creep and recovery; and linear amplitude sweep. Both carbon, hydrogen, nitrogen, sulfur, and oxygen and FTIR analysis indicated that BO had caused alterations at the molecular level of AC30. An increase in absolute viscosity and softening point was observed up to a BO dosage of 10 %. Dynamic viscosity was observed to increase until 5 % BO dosage. BO dosages of 10 % and 15 % were observed to increase the high-temperature PG. However, the intermediate temperature grade increased for all BO dosages. Only 15 % BO dosage caused a compromise in the low-temperature PG. Nonrecoverable creep compliance was observed to decrease until the BO dosage of 10 %, indicating an enhancement in rutting resistance. Also, fatigue life was observed to enhance until 10 % BO dosage. Overall, the study indicated that groundnut shell BO can substantially improve the resistance to primary distresses of rutting, fatigue, and thermal cracking. Conclusively, a BO dosage of 10 % was observed to be the most favorable.

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    • © ASTM International 2020. All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of the publisher.
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  • Publication Date: 2020


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  • Accession Number: 01877858
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 28 2023 9:56AM