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Thermal and hygric properties of Portland cement mortar after high-temperature exposure combined with compressive stress
AbstractThermal conductivity λ, water vapor permeability δ, and liquid moisture diffusivity κ of cement mortar are measured on specimens subjected to four types of pretreatment, namely, unloaded, mechanically loaded to 90% of compressive strength, thermally loaded by subjecting to a temperature of 800 °C for 2 h, and loaded both mechanically and thermally. The values of λ and κ are found to depend very significantly on the loading mode. The maximum differences observed compared to the unloaded samples are almost one order of magnitude for λ and as much as three orders of magnitude for κ. In contrast, the values of δ are found to increase by only about 40% compared to the basic unloaded material. It is proposed that the observed large differences in λ and κ are due to the formation of cracks and the increase of total pore volume, which were shown by visual analysis and mercury porosimetry.
Thermal and hygric properties of Portland cement mortar after high-temperature exposure combined with compressive stress
AbstractThermal conductivity λ, water vapor permeability δ, and liquid moisture diffusivity κ of cement mortar are measured on specimens subjected to four types of pretreatment, namely, unloaded, mechanically loaded to 90% of compressive strength, thermally loaded by subjecting to a temperature of 800 °C for 2 h, and loaded both mechanically and thermally. The values of λ and κ are found to depend very significantly on the loading mode. The maximum differences observed compared to the unloaded samples are almost one order of magnitude for λ and as much as three orders of magnitude for κ. In contrast, the values of δ are found to increase by only about 40% compared to the basic unloaded material. It is proposed that the observed large differences in λ and κ are due to the formation of cracks and the increase of total pore volume, which were shown by visual analysis and mercury porosimetry.
Thermal and hygric properties of Portland cement mortar after high-temperature exposure combined with compressive stress
Černý, R. (author) / Totová, M. (author) / Poděbradská, J. (author) / Toman, J. (author) / Drchalová, J. (author) / Rovnanı́ková, P. (author)
Cement and Concrete Research ; 33 ; 1347-1355
2003-02-11
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2003