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Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

Černý, R. / Poděbradská, J. / Totová, M. / Toman, J. / Drchalová, J. / Rovnaníková, P. / Bayer, P.

Abstract The effect of elevated temperatures on basic hygric and thermal properties of three types of glass fiber reinforced cement composites (GFRC) is analyzed in the paper. The main difference in the composition of particular GFRC is the use of wollastonite and vermiculite in two of them instead of usual sand aggregates. The composites containing wollastonite and vermiculite are found to have about four times lower thermal conductivity and two to three times lower thermal diffusivity in room temperature conditions. After heating the samples to 800°C and subsequent cooling, a decrease in room-temperature thermal conductivity as high as 50% and an increase in moisture diffusivity in the range of one to two orders of magnitude are observed for all types of studied materials. The application of wollastonite and vermiculite exhibits a positive effect on the high temperature linear thermal expansion coefficient. On the other hand, for temperatures higher than 450°C the thermal diffusivity of materials with wollastonite and vermiculite is higher than of common GFRC with sand aggregates.

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Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

Černý, R. / Poděbradská, J. / Totová, M. / Toman, J. / Drchalová, J. / Rovnaníková, P. / Bayer, P.

Abstract The effect of elevated temperatures on basic hygric and thermal properties of three types of glass fiber reinforced cement composites (GFRC) is analyzed in the paper. The main difference in the composition of particular GFRC is the use of wollastonite and vermiculite in two of them instead of usual sand aggregates. The composites containing wollastonite and vermiculite are found to have about four times lower thermal conductivity and two to three times lower thermal diffusivity in room temperature conditions. After heating the samples to 800°C and subsequent cooling, a decrease in room-temperature thermal conductivity as high as 50% and an increase in moisture diffusivity in the range of one to two orders of magnitude are observed for all types of studied materials. The application of wollastonite and vermiculite exhibits a positive effect on the high temperature linear thermal expansion coefficient. On the other hand, for temperatures higher than 450°C the thermal diffusivity of materials with wollastonite and vermiculite is higher than of common GFRC with sand aggregates.

Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

Černý, R. / Poděbradská, J. / Totová, M. / Toman, J. / Drchalová, J. / Rovnaníková, P. / Bayer, P.

Abstract The effect of elevated temperatures on basic hygric and thermal properties of three types of glass fiber reinforced cement composites (GFRC) is analyzed in the paper. The main difference in the composition of particular GFRC is the use of wollastonite and vermiculite in two of them instead of usual sand aggregates. The composites containing wollastonite and vermiculite are found to have about four times lower thermal conductivity and two to three times lower thermal diffusivity in room temperature conditions. After heating the samples to 800°C and subsequent cooling, a decrease in room-temperature thermal conductivity as high as 50% and an increase in moisture diffusivity in the range of one to two orders of magnitude are observed for all types of studied materials. The application of wollastonite and vermiculite exhibits a positive effect on the high temperature linear thermal expansion coefficient. On the other hand, for temperatures higher than 450°C the thermal diffusivity of materials with wollastonite and vermiculite is higher than of common GFRC with sand aggregates.

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Title:

Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

Contributors:

Černý, R. (author) / Poděbradská, J. (author) / Totová, M. (author) / Toman, J. (author) / Drchalová, J. (author) / Rovnaníková, P. (author) / Bayer, P. (author)

Published in:

Materials and Structures ; 37

Publication date:

2004

ISSN:

DOI:

https://doi.org/10.1007/BF02483289

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Specific Heat Capacity , Wollastonite , Calcium Hydroxide , Thermal Diffusivity , Moisture Diffusivity

Classification:

BKL: 56.45 Baustoffkunde / 51.30 Werkstoffprüfung, Werkstoffuntersuchung
Local classification TIB: 275/6500 / 250/6500

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