High Frequency Dielcometric Control over the Process of Cement Materials Hardening

The change in dielectric properties of cement stone (dielectric permeability and dielectric losses) at the frequency of 1.5 MHz in the course of hardening under normal conditions and after thermal treatment has been determined. In the process of hydration hardening of the cement stone, along with improving its mechanical strength, the reduction in dielectric permeability and dielectric losses, which are determined by the crystallinity and level of energy ties of water polar molecules in it, takes place. The samples that underwent steam treatment, the dielectric permeability and dielectric losses are higher than that of samples hardened under normal conditions. The temperature of steam treatment has the biggest influence on dielectric properties of the cement stone. The dielcometric analysis can be successfully used for determining optimal regimes of concrete treatment.

G.I. BERDOV, Doctor of Sciences (Engineering),
A.N. MASHKIN, Candidate of Sciences (Engineering),
S.A. VINOGRADOV, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Novosibirsk State University of Architecture and Civil Engineering (Sibstrin) (113 Leningradskaya Street, 630008, Novosibirsk, Russian Federation)

1. Заринский В.А. Диэлькометрия. Химическая энцикло педия. Т. 2. М.: Советская энциклопедия, 1990. 210 с. 
2. Заринский В.А., Ермаков В.И. Высокочастотный химический анализ. М.: Наука, 1970. 200 с. 
3. Lianzhen Xiao, Xiastes Wel. Early age compressive strength of pastes by electrical resistivity method and maturity method. Journal of Wuhan University of Technology – Materials Science Edition. 2011. Vol. 22. Is. 5, pp. 983–989. 
4. Topci I.B., Ugunoglu T., Hocaoglu I. Electrical conductivity of setting cement paste with different mineral admixtures. Construction and Building Materials. 2012. Vol. 28. No. 1, pp. 414–420. 
5. Wei Xiaosheng, Li Zongjin, Xiao Lianzhen, Thong Wangfai. Influence of calcium sulfate state and fineness of cement on hydration of Portland cements using ectrical measurement. Journal of Wuhan University of Technology – Materials Science Edition. 2006. Vol. 21. Is. 4, pp. 141–145. 
6. Heikal M., Helmy I., El-Didamony H., El-Raoof F.A. Electrical conductivity, physico-chemical and mechanical characteristics of fly ash pozzolanic cement. Ceramics- Silikáty. 2004. Vol. 48. Is. 2, pp. 49–58. 
7. Salem Th. M. Electrical conductivity and rheological properties of ordinary Portland cement–silica fume and calcium hydroxide–silica fume pastes. Cement and Concrete Research. 2002. Vol. 32, Is. 9, pp. 1473–1481. 
8. McCarter William J. Effects of temperature on conduction and polarization in Portland cement mortar. Journal of the American Ceramic Society. 1995. Vol. 78. Is. 2, pp. 411–415. 
9. Levita G., Marchetti A., Gallone G., Princigallo A., Guerrini G.L. Electrical propertied fluidified Portland cement mixes in the early stage of hydration. Cement and Concrete Research. 2000. Vol. 30. Is. 6, pp. 923–930. 
10. Yoon S.S., Kim H.C., Hill R.M. The dielectric response of hydrating porous cement paste. Journal of Physics D: Applied Physics. 1996. Vol. 29. No. 3, pp. 869–875. 
11. Haddad R.H., Al-Qadi I.L. Characterization of Portland cement concrete using electromagnetic waves over the microwave frequencies. Cement and Concrete Research.1998. Vol. 28. Is. 10, pp. 1379–1391. 
12. Водопьянов К.А. Температурно-частотная зависи мость для диэлькетрических потерь в кристаллах с полярными молекулами // Доклады АН СССР. 1952. Т. 94. № 5. С. 919–921.