Skip navigation
Use este identificador para citar ou linkar para este item: http://repositorio.unb.br/handle/10482/33801
Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
ARTIGO_EffectNanoSilica.pdf1,04 MBAdobe PDFVisualizar/Abrir
Título: Effect of nano-silica deposition on cellulose fibers on the initial hydration of the portland cement
Autor(es): Raabe, Joabel
Santos, Laryssa Paz dos
Del Menezzi, Cláudio Henrique Soares
Tonoli, Gustavo Henrique Denzin
Assunto: Cimento portland
Celulose
Fibras modificadas
Data de publicação: 2018
Editora: BioResources
Referência: RAABE, Joabel et al. Effect of nano-silica deposition on cellulose fibers on the initial hydration of the portland cement. BioResources, v. 13, n. 2, p. 3525-3544, 2018. Disponível em: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_13_2_3525_Raabe_Nano_Silica_Deposition_Cellulose_Fibers/6010. Acesso em: 22 jan. 2019.
Abstract: The surface modification of cellulose fibers was studied, and its influence on the initial hydration of fiber-cement mixtures was evaluated. The fiber modification was conducted through deposition of nano-silica on their surface via the sol-gel method. The fibers were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and the Brunauer-Emmett-Teller method to determine their porosity and specific surface area. The inhibition index (II) was determined in order to evaluate the effect of fibers at the initial hydration of the Portland cement. Modified fibers (MF) presented a homogeneous surface coating formed by spherical nano-silica. The crystallinity index of the fibers was reduced 15% and the specific surface area, volume, and pore diameter increased 209%, 134%, and 10%, respectively, after modification. Regarding the initial hydration, the results showed that the nano-silica present on the surface of the MF slightly accelerated the process of hardening and did not inhibit the hydration of the cement paste (without limestone and additives). The inhibition index of the composites was impaired when limestone (30%) and additives (2%) were added as partial replacement of cement, as well as when the water:cement ratio increased, retarding the initial hydration of the cement.
Licença: Autorização concedida ao Repositório Institucional da Universidade de Brasília (RIUnB) pelo professor Cláudio Henrique Soares Del Menezzi, em 21 de janeiro de 2019, para disponibilizar o artigo, gratuitamente, para fins de leitura, impressão e/ou download, a título de divulgação da obra.
Aparece nas coleções:Artigos publicados em periódicos e afins

Mostrar registro completo do item Visualizar estatísticas



Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.