Effect of colloidal silica on the mechanical properties of fiber-cement reinforced with cellulosic fibers
Nenhuma Miniatura disponível
Data
2014-11-01
Autores
Santos, Sergio Francisco [UNESP]
Rodrigues, Jose de Anchieta
Denzin Tonoli, Gustavo Henrique
Feuzicana de Souza Almeida, Alessandra Etuko
Savastano, Holmer
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Resumo
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.
Descrição
Palavras-chave
Como citar
Journal Of Materials Science. New York: Springer, v. 49, n. 21, p. 7497-7506, 2014.