A measuring method for the determination of linear thermal expansion of porous materials at high temperatures

Toman, J.; Koudelová, Petra

doi:10.1068/htwu36

Cited by 12 publications

(9 citation statements)

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“…4 showed that in the range of lower temperatures the measured data corresponded well with the common α values known for cement mortar and concrete (Toman et al 1999;Toman and Černý 2001) and also for higher temperatures the observed changes were not very dramatic. The minima at approximately 500 °C and 800 °C are most probably a consequence of decomposition reactions in the cement binder, namely calcium hydroxide in the first case and calcium carbonate in the second (Toman et al 1999). …”

Section: Resultssupporting

confidence: 60%

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Thermophysical and Mechanical Properties of Fiber‐reinforced Composite Material Subjected to High Temperatures

Vejmelková

Konvalinka

Padevět

et al. 2010

Journal of Civil Engineering and Management

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Abstract. The bulk density, open porosity, matrix density, tensile strength, bending strength, thermal diffusivity, specific heat capacity, thermal conductivity and linear thermal expansion coefficient of high-density glass fiber reinforced cement composite are determined as functions of temperature up to 1000 °C. The basic physical parameters and mechanical parameters are found to exhibit the most important changes between the reference state and 600 °C pre-heating where the increase of porosity is as high as 40% and both the tensile strength and bending strength decrease to about one third of their original values. The measured dependences of thermal diffusivity and thermal conductivity on temperature indicate that the heat transfer in the studied material is accelerated once temperature achieves 500-600 °C but the change in heat storage expressed by the specific heat capacity is less important. The linear thermal expansion coefficient is not found to be affected by high temperatures in a negative way; it is either lower or comparable to its low-temperature values.

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Section: Resultssupporting

confidence: 60%

“…The high-temperature measurements of linear thermal expansion coefficient α were performed using the method proposed in Toman et al (1999). The measuring device is based on the application of a comparative technique.…”

Section: Linear Thermal Expansion Coefficientmentioning

confidence: 99%

Thermophysical and Mechanical Properties of Fiber‐reinforced Composite Material Subjected to High Temperatures

Vejmelková

Konvalinka

Padevět

et al. 2010

Journal of Civil Engineering and Management

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“…The linear thermal expansion coefficient increased with the temperature up to 300 • C (Figure 9), but even in its maximum it was lower than for common Portland cement mortar [18]. In the temperature range of 300-600 • C it decreased fast so that at 600 • C it was lower than at room temperature.…”

Section: Linear Thermal Expansion Coefficientmentioning

confidence: 83%

“…The (T ) functions determined up to 1000 • C for cement mortar in [18] and high performance concrete in [24] were similar in shape to the studied aluminosilicate material but up to 50% higher in the whole temperature range. As lower thermal strain generally results in lower thermal stress, thus in lower risk of failure of a building element subjected to one-sided heating, the thermomechanical behavior of the alkali-activated aluminosilicate composite studied in this paper can be characterized as better than that of Portland cement-based composites.…”

Section: Linear Thermal Expansion Coefficientmentioning

confidence: 94%

“…The comparative method proposed by Toman et al [18] was used for the determination of the linear thermal expansion coefficient in high-temperature range. In the current experimental setup, the analyzed specimen and the standard are put together into a furnace pre-heated to the temperature T i and provided with identical ceramic rods passing through the furnace cover.…”

Section: Linear Thermal Expansion Coefficientmentioning

confidence: 99%

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Thermal properties of alkali‐activated aluminosilicate composite with lightweight aggregates at elevated temperatures

et al. 2010

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SUMMARYThermal diffusivity, specific heat capacity and linear thermal expansion coefficient of a lightweight composite with alkali-activated aluminosilicate binder and heat-resistant aggregate mixture of expanded vermiculite and electrical porcelain are measured in a wide temperature range. Experimental results show that the studied material has good prerequisites for high-temperature applications. The apparent thermal diffusivity at one-sided heating is significantly lower than at room temperature, and decreases for temperatures higher than 400 • C. The effective specific heat capacity at elevated temperatures increases with temperature in almost the whole analyzed temperature range. The linear thermal expansion coefficient is substantially lower compared with common cement-based composites.

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Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

et al. 2004

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A measuring method for the determination of linear thermal expansion of porous materials at high temperatures

Cited by 12 publications

References 0 publications

Thermophysical and Mechanical Properties of Fiber‐reinforced Composite Material Subjected to High Temperatures

Thermophysical and Mechanical Properties of Fiber‐reinforced Composite Material Subjected to High Temperatures

Thermal properties of alkali‐activated aluminosilicate composite with lightweight aggregates at elevated temperatures

Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

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