The effect of compressive stress on thermal and hygric properties of Portland cement mortar in wide temperature and moisture ranges

Černý, Robert; Maděra, Jiří; Poděbradská, J.; Toman, J.; Drchalová, J.; Klečka, Tomáš; Jurek, K.; Rovnanı́ková, Pavla

doi:10.1016/s0008-8846(00)00310-0

Cited by 55 publications

(15 citation statements)

References 5 publications

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“…Therefore, all chemical decomposition reactions and phase-change processes taking place at elevated temperatures affected the temperature measurements, thus the values of apparent thermal conductivity, in a significant way. For the fiber-cement composite material studied in this paper the most thermally induced processes were endothermic (see, e.g., the DTA analysis of Portlandcement mortar in [32]). Therefore, they effectively decreased the apparent thermal conductivity.…”

Section: Practical Application Of the Apparent Thermal Conductivity Amentioning

confidence: 99%

Apparent thermal conductivity approach at high-temperature measurements of porous materials

Černý

Vejmelková

2011

Measurement

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Section: Practical Application Of the Apparent Thermal Conductivity Amentioning

confidence: 99%

Apparent thermal conductivity approach at high-temperature measurements of porous materials

Černý

Vejmelková

2011

Measurement

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“…This is a logical result because the board-shaped inclusions should lead to results closer to the parallel model than to the serial model (taken from the point of view of mixing thermal conductivities in Eqs. (5)- (6), for the thermal resistances the serial-parallel orientation is naturally quite opposite, i.e. the serial model should be closer to the board-type inclusions).…”

Section: Materials and Samplesmentioning

confidence: 99%

Effect of Moisture on the Thermal Conductivity of a Cementitious Composite

et al. 2006

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The measurements of thermal conductivity of a cement-based composite material are performed in dependence on moisture content from dry state to fully water saturated state using an impulse technique. Then, the obtained data are analyzed using Brugemann and Wiener homogenization formulas. The validity of applied homogenization techniques is assessed comparing the measured and calculated results. On the basis of the experimental data and the homogenization analyses, the effects of total pore volume, pore distribution and moisture content on the thermal conductivity are discussed. Key words:Thermal conductivity, moisture content, cementitious composites, homogenization IntroductionCementitious composites contain a significant amount of pores of different size. As the thermal conductivity of the air is 0.026 W/mK [1] and the thermal conductivity of cement stone is (depending on the amount and the type of aggregates) in the range of 1-3 W/mK [2], both the total pore volume and the distribution of pores can affect the thermal conductivity of a cementitious material in a very significant way. In usual service conditions, cementitious composites always contain certain amount of water. The thermal conductivity of water is 0.60 W/mK [1], which is more than 20 times higher than of the air. Therefore, if water is present in the pore space, its effect competes with the effect of air, and the thermal conductivity of a composite material can be considered as a result of this competition together with the effect of the cement matrix.

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“…Although there are several studies on the basic physical, mechanical properties and raw material characteristics of mortars and bricks used in historical dome structures [3,[6][7][8][9] and several authors have studied the thermal and hygric expansion characteristics of contemporary cement mortars, lime mortars and plasters [10][11][12][13], the research on the thermal and hygric expansion properties of mortars and bricks used in the dome structures of historical buildings is non-existent in literature to the extent of authors' knowledge.…”

Section: Introductionmentioning

confidence: 99%

Thermal and hygric expansion characteristics of mortars and bricks used in the dome structures of Turkish Baths from 14th and 15th centuries

Güney

Caner

2015

Construction and Building Materials

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The effect of compressive stress on thermal and hygric properties of Portland cement mortar in wide temperature and moisture ranges

Cited by 55 publications

References 5 publications

Apparent thermal conductivity approach at high-temperature measurements of porous materials

Apparent thermal conductivity approach at high-temperature measurements of porous materials

Effect of Moisture on the Thermal Conductivity of a Cementitious Composite

Thermal and hygric expansion characteristics of mortars and bricks used in the dome structures of Turkish Baths from 14th and 15th centuries

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