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Pull-out behavior of natural fiber from earth-based matrix

Author(s): Mustapha, Kabiru; Azeko, Salifu T; Annan, Ebenezer; Zebaze Kana, Martiale G; Daniel, Leo; et al

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Abstract: This paper presents the results of a combined experimental and analytical study of the pull-out behavior of natural fiber (grass straw) from an earth-based matrix. A single fiber pull-out approach was used to measure interfacial properties that are significant to toughening brittle materials via fiber reinforcement. This was used to study the interfacial shear strengths of straw fiber-reinforced earth-based composites with a matrix that consists of 60 vol. % laterite, 20 vol. % clay and 20 vol. % cement. The composites that were used in the pull-out tests included composites reinforced with 0, 5, 10 and 20 vol. % of straw fibers. The toughening behavior of fiber-reinforced earth-based matrix was analyzed in terms of their interfacial shear strengths and bridging zones, immediately behind the crack tip. This approach is consistent with microscopic observations that reveal intact bridging fibers behind the crack tip, as a result of debonding of the fiber–matrix interface. Analytical models were used to study the debonding of fiber from the matrix materials, as well as the toughening due to crack-tip shielding via bridging. The results show that increasing the fiber embedment length and the fiber volume fraction (in the earth/cement matrix) increases the peak pull-out load. The debonding process was also found to be associated with a constant friction stress. The combined effects of multiple toughening mechanisms (debonding and crack bridging) are elucidated along with the implications of the results for the design of earth-based composites for potential applications in robust building materials for sustainable eco-friendly homes.
Publication Date: 2016
Citation: Mustapha, Kabiru, Salifu T. Azeko, Ebenezer Annan, Martiale G. Zebaze Kana, Leo Daniel, and Winston O. Soboyejo. "Pull-out behavior of natural fiber from earth-based matrix." Journal of Composite Materials 50, no. 25 (2016): 3539-3550. doi: 10.1177/0021998315622247
DOI: doi:10.1177/0021998315622247
ISSN: 0021-9983
EISSN: 1530-793X
Pages: 3539 - 3550
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Composite Materials
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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