期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 345, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.128363
关键词
Sisal fiber; Alkalization; Interface; Cement -based composite
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior CAPES (Brazil) [001, 12/2017]
- CNPq
- CAPES (Brazil) through the Probral program
- DAAD (Germany) [8887.144079/2017-00]
This study evaluated the effect of alkali treatment on sisal fibers and found that it can improve the fiber properties and enhance their effectiveness as reinforcement in cement-based matrices, while also being sustainable and suitable.
This work aims to evaluate the effect of alkali treatment on sisal fibers to improve the fiber properties and the effectiveness of their use as reinforcement in cement-based matrices. Alkaline solution concentration (1, 5 and 10 wt% NaOH) and post-treatment protocol (use of distilled water or acetic acid) influence were evaluated. The physical, chemical, thermal, wettability and surface characteristics were analyzed. Also, single-fiber direct tensile and pullout tests were performed. Results showed an increase in cellulose proportion with a reduction in hemicellulose and lignin content upon alkali treatment. Consequently, enhanced thermal stability and a decrease on the water uptake tendency were reached. Additionally, improved tensile properties, as well as an enhanced bond with the cementitious matrix, were found for alkali-treated fibers. Also, fibers became more stable when subjected to alkaline aggressive conditions. Thus, the alkali-treated sisal fiber seems to be an adequate and sustainable alternative as reinforcement for cement-based matrices.
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