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metadata.artigo.dc.title: Effect of colloidal silica on the mechanical properties of fiber-cement reinforced with cellulosic fibers
metadata.artigo.dc.creator: Santos, Sergio Francisco
Rodrigues, José de Anchieta
Tonoli, Gustavo Henrique Denzin
Almeida, Alessandra Etuko Feuzicana de Souza
Savastano Júnior, Holmer
metadata.artigo.dc.subject: Silica fume
Calcium hydroxide
Ordinary Portland Cement
Colloidal silica
Cement composite
metadata.artigo.dc.publisher: Springer Nov-2014
metadata.artigo.dc.identifier.citation: SANTOS, S. F. et al. Effect of colloidal silica on the mechanical properties of fiber-cement reinforced with cellulosic fibers. Journal of Materials Science, [S.l.], v. 49, n. 21, p. 7497-7506, Nov. 2014.
metadata.artigo.dc.description.abstract: The effect of colloidal silica on the hydration reaction of the Portland cement system and its effect on the resulting mechanical properties are not completely understood. Silica nanoparticles can affect the behavior and performance of fiber–cement, such as the calcium–silicate–hydrate gel of the matrix and the fiber–matrix interface bonding. The main objective of this study is to evaluate the effects of various contents of colloidal silica (0, 1.5, 3, 5, and 10 % w/w) on the microstructure and mechanical performance of cement composites reinforced with cellulosic pulp. Fiber–cement composites with unbleached eucalyptus Kraft pulp as the micro-fiber reinforcement were produced by the slurry dewatering technique followed by pressing. The average values of the modulus of rupture of the fiber–cement decreased with increasing colloidal silica content. However, the pullout of the fibers increased significantly in the fiber–cement composites with additions between 3 and 10 % w/w of colloidal silica suspension, as indicated in the scanning electron microscopy images and by the improvement in the energy of fracture values.
metadata.artigo.dc.language: en_US
Appears in Collections:DCF - Artigos publicados em periódicos

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