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- Title
Effect of Ozone Treatment on Softwood Soda Lignin-based Water Reducer Performance for Concrete.
- Authors
Shiho Takahashi; Yasumitsu Uraki; Tatsuhiko Yamada
- Abstract
A lignin-based water reducer for concrete was prepared from softwood soda lignin. The soda lignin and the lignin-polyethylene glycol (PEG) derivative were modified with ozone to improve their performance as water reducers. The performance of ozone-treated soda lignin was superior than untreated soda lignin and commercial lignosulfonate-type water reducers in the mortar flow test. The soda lignin treated with a high ozone charge showed better performance than lignin treated with a low ozone charge. The ozone treatment improved the performance of the lignin-PEG derivative water reducer as well. The lignin-PEG derivative water reducer with a longer PEG chain length showed better performance than that of the shorter PEG chain. The zeta potential of cement suspension with the ozone-treated soda lignin showed a higher negative value than the untreated soda lignin. The data of zeta potential analysis suggested that the electrostatic repulsion force of cement particles with the ozone-treated lignin would be larger than the untreated lignin.
- Publication
BioResources, 2021, Vol 16, Issue 1, p1787
- ISSN
1930-2126
- Publication type
Article
- DOI
10.15376/biores.16.1.1787-1797