Abstract
The electricla behavior of polymer-modified cement mortars has been evaluated as a function of the polymer and the evaporable water contents. The effects have been correlated to microstructural changes induced by the addition of an acrylic polymer and an epoxy resin purposely formulated for cement-based composites. Moreover, the effect of the addition of pulverized fly ash, which has proved to be beneficial on many of the cement composite properties, has also been studied. Polymer modified cement mortar composites exhibit a tendency towards insulating behavior which is greatly enhanced by water losses: the electrical properties must thus be carefully evaluated when static charge accumulation is not desired. The addition of pulverized fly ash to ordinary Portland mortars slightly influences the electrical behaviour, but strongly enhances the insulating behaviour of polymer modified cement mortars.
Résumé
On a évalué le comportement électrique des mortiers de ciment modifiés par des polymères, en fonction de leurs contenus en polymères et en eau évaporable. Les effets ont été mis en corrélation avec des changements microstructuraux induits par un polymère acrylique et une résine epoxyde spécialement conçus pour des composites à base de ciment. L'addition de cendres volantes, qui améliore les propriétés de beaucoup de ces composites, a également été étudiée. Des composites mortiers de ciment-polymères montrent une tendance vers un comportement isolant, qui augmente considérablement en fonction des pertes en eau. Les propriétés électriques doivent donc être soigneusement évaluées pour éviter l'accumulation de charges statiques. L'addition des cendres volantes aux mortiers de ciment normaux n'influence que faiblement le comportement électrique, mais augmente considérablement les effets isolants des polymères.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Perez-Pena, M., Roy, D. M. and Tamas, F. D., ‘Influence of chemical composition and inorganic admixtures on the electrical conductivity of hydrating cement pastes’,J. Mat. Res. 4 (1989) 215–223.
Abd El Wahed, M. G., Helmy, I. M., El Didamony, H. and Ebied, E., ‘Effect of admixture on the electrical behaviour of Portland cement’,J. Mat. Sci. Lett. 12 (1993) 40–42.
Hansson, I. L. H. and Hansson, C. M., ‘Ion-conduction in cement based materials’,Cem. Conc. Res. 15 (1985) 201–212.
Tashiro, C., Ishida, H. and Shimamura, S., ‘Dependence of the electrical resistivity on evaporable water content in hardened cement pastes’,J. Mat. Sci. Lett. 6–9 (1987) 1379–83.
Camp, P. R. and Billotta, S., ‘Dielectric properties of Portland cement paste as a function of time since mixing,’J. Appl. Phys. 66 (12) (1989) 6007–11.
McCarter, W.J. and Garvin S., ‘Dependence of electrical impedance of cement-based materials on their moisture condition’,J. Phys. D: Appl. Phys. 22 (1989) 1773–1776.
Xie, P., Beauduin, J. J. and Brosseau, R., ‘Flat aggregate Portland cement pastes interfaces; electrical conductivity models’,Cem. Conc. Res. 21 (4) (1991) 515–23.
Shimamura, S. and Tashiro, C., ‘Contribution of evaporable water to electrical conduction in porous hardened, cements’,J. Mat. Sci. Lett. 11 (1992) 396–99.
Christensen, B. J., Coverdale, R. T., Olson, R. A., Ford, S. J., Gaboczi, E. J., Jennings, H. M. and Mason, T. O., ‘Impedance spectroscopy of hydrating cement based materials: measurements, interpretation and application’,J. Am. Ceram. Soc. 77 (11) (1994) 2789–2802.
ASTM D 4470-86, ‘Standard method for static electrification’.
Motori, A., Sandrolini, F., Zappia, G. and Saccani, A., ‘Premix polymer-cement materials: workability, setting time and mechanical strength as influenced by epoxy resins’, Proceedings of 15th Conference on Silicate Industry and Silicate Science, Budapest (Hungary), June 12–16, 1989, 328–333.
Motori, A., Sandrolini, F., Saccani A. and Zappia, G., ‘Curing procedures, microstructure and mechanical properties of premix epoxy resin/cement mortars’,Materials Engineering 1 (1990) 135–49.
Sandrolini, F., Saccani, A. and Motori, A., ‘Influence of polymeric phase distribution on the mechanical properties of premix PCC materials’, Proceedings of the VIIth Int. Congress on Polymers in Concrete, Sept. 22/25, Moscow (Russia) 1992, 153–161.
Sandrolini, F., Saccani, A., Paciello, G. and Bonora, V., ‘Electrical properties of polymer containing cementitious materials’, Proceedings of the RILEM TC 113 Symposium, Oostende (Belgium) 6 July 1995, 63–69.
Sandrolini, F., Bonora, V., Saccani, A., Dinelli, G. and Belz, G., ‘Pulverized fly ash recycling in composite materials for innovative building elements’, Proceedings of the 1st Conf. on Chemical and Process Engineering, 13–15 May 1993 Florence (Italy), 703–706.
Bonora, V., Saccani, A., Sandrolini, F., Beltz, G. and Dinelli, G., ‘Resistance of polymer modified mortars containing fly ash to environmental attacks’ Proceedings of the VIIIth ICPIC, Oostende (Belgium) 3–5 July 1995, 221–226.
Italian Standards, D.M. 03.06.68 (G.U. n°180, 17/07/68).
Sandrolini, F., ‘Versatile three-terminal cell for investigating the electrical properties of insulating materials over a wide frequency and temperature range’,J. Phys. E: Sci. Instr. 13 (1980) 152–156.
Marrone, G., Nicolini, P., Motori, A. and Sandrolini, F., ‘Laboratory measuring techniques applied to check insulating materials and interfaces in composite insulators’, Proceedings of the 34th Session CIGRÈ, Parigi, 30 August–5, September 1992, Paper 15.402.
Author information
Authors and Affiliations
Additional information
Editorial note Prof. Dr. F. Sandrolini is a RILEM Senior Member.
Rights and permissions
About this article
Cite this article
Sandrolini, F., Saccani, A. The effect of polymer addition on the electrical behavior of ordinary and pulverized fly ash modified cement mortars. Mat. Struct. 30, 412–417 (1997). https://doi.org/10.1007/BF02498564
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02498564