| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312804 |
| ISSN: | 1516-1439 |
| Autores: | Gomes, Carlos Eduardo Marmorato1 Ferreira, Osny Pellegrino Fernandes, Mauro Roberto2 |
| Instituciones: | 1Universidade de Sao Paulo, Escola de Engenharia, Sao Carlos, Sao Paulo. Brasil 2Universidade de Sao Paulo, Instituto de Quimica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2005 |
| Periodo: | Ene-Mar |
| Volumen: | 8 |
| Número: | 1 |
| Paginación: | 51-56 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | To understand the principles of polymer modification and its interference in the formation of some phases of Portland cement composites, several techniques are adopted such as Fourier Transform Infrared Spectroscopy and Thermogravimetric Analysis. In this study, these techniques were adopted to verify the influence of VA/VeoVA copolymer in seven pastes of high-early-strength portland cement twenty-eight days old, being four pastes with different polymer content and the same water/cement ratio, and the other three with extra water content increased by polymer content. In addition, scanning electronic microscopy was employed to verify the formation of copolymer film. The results showed possible interaction between acetate anion from the partial hydrolysis of copolymer and Ca++ ion from C2S and C3S hydration. Moreover, the magnitude of the decrease of portlandite formation is directly affected by water/cement ratio. By SEM analyses, the formation of two matrices, being one organic and the other inorganic, was also observed |
| Disciplinas: | Ingeniería, Química |
| Palabras clave: | Ingeniería de materiales, Química de polímeros, Cemento Portland, Modificación química, Acetato de vinilo, Propiedades mecánicas, Resistencia |
| Keyword: | Engineering, Chemistry, Materials engineering, Polymer chemistry, Portland cement, Chemical modification, Vinyl acetate, Mechanical properties, Resistance |
| Texto completo: | Texto completo (Ver HTML) |
