Rheological properties of cement pastes with cellulose microfibers
The rheological properties of cement pastes prepared using kenaf-plant cellulose microfibers (CMFs), which was incorporated for the purpose of internal curing, were investigated. The main test variables are the length and mass fraction of the CMFs. CMFs of lengths of 400 μm and 5 mm were included in...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420321438 |
| _version_ | 1818665875632291840 |
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| author | Seongwoo Gwon Myoungsu Shin |
| author_facet | Seongwoo Gwon Myoungsu Shin |
| author_sort | Seongwoo Gwon |
| collection | DOAJ |
| description | The rheological properties of cement pastes prepared using kenaf-plant cellulose microfibers (CMFs), which was incorporated for the purpose of internal curing, were investigated. The main test variables are the length and mass fraction of the CMFs. CMFs of lengths of 400 μm and 5 mm were included in the mixtures at 0.3, 0.6, 1, and 2 wt.% of the cement. Dry CMF particles were wetted with water to the fiber saturation point using vacuum filtration immediately before mixing. An optimum shearing protocol was designed to minimize the shear-induced structural breakdown of cement pastes with the CMFs under hysteresis loops of the shear strain rate. It consisted of an initial pre-shearing step at a high shear strain rate of 80 1/s, three acceleration and deceleration cycles with a maximum shear strain rate of 40 1/s, and a rest step before each acceleration. The mixtures’ flow curves were well fitted to the Herschel–Bulkley fluid model with a minimum coefficient of determination of 0.9993. The yield stress of cement pastes was at least 34.3% higher for longer CMFs at the same dose. However, the mixtures exhibited similar plastic viscosities with a coefficient of variation of only approximately 5.8%. |
| first_indexed | 2024-12-17T05:55:35Z |
| format | Article |
| id | doaj.art-00f5f29497974b1cb774d658535259b5 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-17T05:55:35Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-00f5f29497974b1cb774d658535259b52022-12-21T22:01:03ZengElsevierJournal of Materials Research and Technology2238-78542021-01-0110808818Rheological properties of cement pastes with cellulose microfibersSeongwoo Gwon0Myoungsu Shin1School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States; School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South KoreaSchool of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea; Corresponding author.The rheological properties of cement pastes prepared using kenaf-plant cellulose microfibers (CMFs), which was incorporated for the purpose of internal curing, were investigated. The main test variables are the length and mass fraction of the CMFs. CMFs of lengths of 400 μm and 5 mm were included in the mixtures at 0.3, 0.6, 1, and 2 wt.% of the cement. Dry CMF particles were wetted with water to the fiber saturation point using vacuum filtration immediately before mixing. An optimum shearing protocol was designed to minimize the shear-induced structural breakdown of cement pastes with the CMFs under hysteresis loops of the shear strain rate. It consisted of an initial pre-shearing step at a high shear strain rate of 80 1/s, three acceleration and deceleration cycles with a maximum shear strain rate of 40 1/s, and a rest step before each acceleration. The mixtures’ flow curves were well fitted to the Herschel–Bulkley fluid model with a minimum coefficient of determination of 0.9993. The yield stress of cement pastes was at least 34.3% higher for longer CMFs at the same dose. However, the mixtures exhibited similar plastic viscosities with a coefficient of variation of only approximately 5.8%.http://www.sciencedirect.com/science/article/pii/S2238785420321438RheologyNatural fiber compositesCellulose microfiberHerschel–Bulkley fluidStructural breakdownMini-slump flow |
| spellingShingle | Seongwoo Gwon Myoungsu Shin Rheological properties of cement pastes with cellulose microfibers Journal of Materials Research and Technology Rheology Natural fiber composites Cellulose microfiber Herschel–Bulkley fluid Structural breakdown Mini-slump flow |
| title | Rheological properties of cement pastes with cellulose microfibers |
| title_full | Rheological properties of cement pastes with cellulose microfibers |
| title_fullStr | Rheological properties of cement pastes with cellulose microfibers |
| title_full_unstemmed | Rheological properties of cement pastes with cellulose microfibers |
| title_short | Rheological properties of cement pastes with cellulose microfibers |
| title_sort | rheological properties of cement pastes with cellulose microfibers |
| topic | Rheology Natural fiber composites Cellulose microfiber Herschel–Bulkley fluid Structural breakdown Mini-slump flow |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420321438 |
| work_keys_str_mv | AT seongwoogwon rheologicalpropertiesofcementpasteswithcellulosemicrofibers AT myoungsushin rheologicalpropertiesofcementpasteswithcellulosemicrofibers |