The thermal conductivity of fresh concrete

Brown, T. D.; Javaid, Muhammad Yasar

doi:10.1007/bf02478765

Cited by 15 publications

(15 citation statements)

References 1 publication

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“…The mix proportions can be obtained from Ref. 4. The model was also verified with the test results obtained by Xu and Chung 6 (Figs.…”

Section: Verification Of Specific Heat Modelsupporting

confidence: 72%

“…Neville 3 stated that specific heat considerably increases with an increase in moisture content of concrete. Brown and Javaid 4 reported that the specific heat of normal strength concrete varied from 1130.4 to 879.2 J/(kg K) at the ages from 6 h to 7 days, respectively. Schutter and Taerwe 5 measured the specific heat of hardening cement paste samples made with blast furnace slag cement and found that the specific heat decreases linearly with the degree of hydration.…”

Section: Introductionmentioning

confidence: 99%

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Choktaweekarn¹,

Saengsoy²,

Tangtermsirikul³

2009

ScienceAsia

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This study is aimed at investigating the specific heat of fly-ash concrete. The experiments were conducted to obtain the specific heat of fly-ash cement pastes and mortars. Mortars were prepared by varying the sand type and content. It was found that the specific heat decreases as the amount of free water content decreases. The replacement of cement by fly ash resulted in high specific heat at young age but it tends to decrease in the long term due to the pozzolanic reaction. Mortars had lower specific heat than cement pastes. We propose a model for predicting the specific heat of concrete as a function of time, material, and mix proportion. The model, which was verified with various experimental results, simulated the trend of specific heat quite well.

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“…The mix proportions can be obtained from Ref. 4. The model was also verified with the test results obtained by Xu and Chung 6 (Figs.…”

Section: Verification Of Specific Heat Modelsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Untitled

Choktaweekarn¹,

Saengsoy²,

Tangtermsirikul³

2009

ScienceAsia

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“…The thermal conductivity of cement paste has also been observed to decrease by up to 30% over a 7-day hardening period but remained unchanged 5 beyond this period [32,33]. The hardening process can take place in either water, ambient air, or humid air with up to 100% humidity [32,33]. The thermal conductivity of cement paste was found to decrease significantly more when hardening occurred in ambient air [32] rather than submerged in water [33], when the pores are filled with air instead of water.…”

Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 99%

“…This can be attributed to the enhanced pore formation within the composite with increasing amount of water [31]. The thermal conductivity of cement paste has also been observed to decrease by up to 30% over a 7-day hardening period but remained unchanged 5 beyond this period [32,33]. The hardening process can take place in either water, ambient air, or humid air with up to 100% humidity [32,33].…”

Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 99%

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Ricklefs

Thiele

Falzone³

et al. 2017

International Journal of Heat and Mass Transfer

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This thesis investigates the effects of adding microencapsulated phase change materials (PCM) on the thermal conductivity of cement paste and cement mortar composites. Embedding cementitious composites with microencapsulated PCM has been considered a promising method for increasing the thermal mass of buildings to achieve greater energy efficiency. Cement paste and cement mortar samples were synthesized with a constant water to cement ratio of 0.45. Both contained microencapsulated PCM with diameter ranging from 17-20 µm, volume fraction up to 30%, and a melting temperature around 24˚C. The cement mortar also contained quartz grains 150-600 µm in diameter such that the sum of the volume fractions of quartz and microencapsulated PCM was fixed at 55%.All samples were aged for more than 28 days. Their effective density and free moisture content were systematically measured. A guarded hot plate apparatus was designed, assembled, and validated according to the ASTM C177 to measure the effective thermal conductivity of the aged specimens of cement paste and cement mortar without and with microencapsulated PCM. Measurements were 2 performed between 10 and 40˚C, encompassing the entire PCM phase change temperature window. The effective thermal conductivity of both the cement paste and the cement mortar composites was found to be nearly independent of temperature in the range considered. It also decreased as the volume fraction of microencapsulated PCM increased. Finally, excellent agreement was obtained between experimental data and the effective medium approximation derived by Felske (2004) for core-shell-matrix composites. 3The thesis of Alex Ricklefs is approved.

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“…Thermal properties are mainly determined by thermal conductivity, specific heat, thermal diffusivity, thermal expansion, and mass loss.Thermal conductivity is defined as the ratio of heat flow rate to the temperature gradient, and represents the uniform flow of heat through concrete of unit thickness over a unit area subjected to a unit temperature difference between the two opposite faces.The thermal conductivity value of normal concrete ranges from 0.62 to 3.3 W/m/K across more than five folds of magnitude depending on the types of coarse aggregate, moisture condition and temperature [4][5][6][7]. However, the lightweight insulating concrete with polystyrene bead or cellular lightweight concrete even exhibits the thermal conductivity of 0.07 to 0.33 W/m/K [8].…”

Section: Introductionmentioning

confidence: 99%

Review on thermal insulation performance in various type of concrete

Shahedan¹,

Mahmed²,

Kusbiantoro³

et al. 2017

AIP Conference Proceedings

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Abstract. Thermal insulation concrete building plays an important role in environment sustainability especially energy saving buildings. Buildings are one of the largest consumers of energy worldwide. Therefore, significant energy saving can be realized by buildings with proper materials, design and operation. Thermal insulation systems are nowadays mostly applied for such building envelopes where the materials of load bearing structure such as concrete do not have a substantial thermal insulation capability. Thermal insulation in concrete are materials or combinations of materials that are used to provide resistance to heat flow, should have low conductivity for building application in order to represence of a temperature gradient, has an important effect on the heat exchange between the building interior and the ambiance.The aim of this paper is to review the thermal properties include thermal conductivity and specific heat on various types of concrete.

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The thermal conductivity of fresh concrete

Cited by 15 publications

References 1 publication

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Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Review on thermal insulation performance in various type of concrete

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