Polímeros: Ciência e Tecnologia
https://app.periodikos.com.br/journal/polimeros/article/doi/10.1590/S0104-14282005000300009
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Analyses of Microstructural Properties of VA/VeoVA Copolymer Modified Cement Pastes

Ferreira, Osny P.; Gomes, Carlos Eduardo M.

Downloads: 0
Views: 911

Abstract

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.

Keywords

Cement paste, modified mortars, VA/VeoVA copolymer

References



1. Chandra, S & Flodin, P. - Cement Concrete Research, vol.17, p.975-890 (1990).

2. Ohama, Y. - Concrete Composites, vol.20, p.189-212 (1998).

3. Ohama, Y. - Advn. Cement Bas. Materials, v.5, p.31-40 (1997).

4. Fowler, D. W. - Cement and Concrete Composites, vol.21, p.449-452 (1999).

5. Mollah, M. Y. A. et al. - Cement and Concrete Research, vol. 30, pp.267-273 (2000).

6. Dweck, J. et al. - Thermochimica Acta 346, p. 105-113 (2000).

7. Fordham, C. J.; Smalley, I. J. - Cement and concrete research, vol. 15, p. 141-144 (1985).

8. Ollitrault-Fichet, R. et al. - Cement and Concrete Research, vol 28, n12, pp. 1687-1693 (1998).

9. Tisivilis, S. et al. Journal of thermal analysis, vol. 52, p. 863-870 (1998).

10. Afrid et al. - International Journal of Cement Composites and Lightweight Concrete, vol. 11, n.4, p.235-244 (1989).

11. Kriegel, R. et al. - Proceedings of the 11th International Congress on the Chemistry of Cement (ICCC), pp.171- 180 (2003).

12. Fordham, C. J.; Smalley, I. J. Cement and concrete research, vol. 15, p. 141-144 (1985).

13. Silva, D. A. et al. - Cement and Concrete Research, vol.2079, pp.1-8 (2002).
588371067f8c9d0a0c8b46be polimeros Articles
Links & Downloads

Polímeros: Ciência e Tecnologia

Share this page
Page Sections