期刊
COMPOSITES PART B-ENGINEERING
卷 78, 期 -, 页码 153-161出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.03.086
关键词
Fibers; Physical properties; Mechanical properties; Cement-based composites
资金
- National Key Technology R&D Program of the Ministry of Science and Technology of China [2011BAE11B01]
- National Natural Science Foundation of China [51303151]
- Entrepreneurial Talents of Science and Technology Planning Projects of Sichuan Province [2013RZ0036]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [11zxfk26]
The cement-based composites reinforced with cellulosic fibers isolated from rice straw were fabricated by a slurry vacuum de-watering technique. The physical structures and mechanical properties of the composites with fiber contents ranging from 2% to 16% by weight (wt.%) were investigated. Moreover, the composites reinforced with bamboo cellulosic fibers and the control cement paste, sample without cellulosic fibers, were also fabricated as reference materials. As a result, the cement-based composites reinforced by cellulosic fibers showed a remarkable improvement in the mechanical properties. The measurements of the flexural strength and the fracture toughness of the optimal sample were found to be increased by 24.3% and 45 times, respectively. The bulk density of the composites was decreased by 12.4-37.3% as a result of the introduction of cellulosic fibers. Additionally, the field emission scanning electron microscope (FSEM) observations and energy dispersive spectroscopy (EDS) analyses revealed that the hydration products of Portland cement migrated to the fiber lumens, resulting in mineralizing the cellulosic fibers and decreasing the fracture toughness of the composites. (C) 2015 Elsevier Ltd. All rights reserved.
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