SciELO - Scientific Electronic Library Online

 
vol.15 número3Aplicação de resinas sulfônicas como catalisadores em reações de transesterificação de óleos vegetaisExperiências simultâneas de espalhamento de raios X e calorimetria diferencial de varredura (SAXS/WAXD/DSC) com resolução temporal utilizando radiação síncrotron índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

GOMES, Carlos Eduardo M.  e  FERREIRA, Osny P.. Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes. Polímeros [online]. 2005, vol.15, n.3, pp.193-198. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282005000300009.

Recently, modern techniques have been applied for analysis of the influence of polymers on microstructural properties of Portland cement, such as Thermogravimetric Analyses (TG), Scanning Electronic Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and Mercury Intrusion Porosimetry (MIP). In this study, thermogravimetric analyses were used to study the influence of vinyl acetate-versatic vinylester copolymer (VA/VeoVA) in seven pastes of 28-day old Portland cement, in which distinct polymer contents and water/cement ratios were employed. In addition, analyses of FT-IR and MIP on Portland cement pastes modified by the copolymer were employed. The results showed that the addition of polymer interferes significantly in the reduction of Portlandite formation and increases the porosity of the matrices. A possible chemical interaction between the copolymer and hydrated products of Portland cement was also observed.

Palavras-chave : Cement paste; modified mortars; VA/VeoVA copolymer.

        · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons