Measurement of thermal properties of brick materials based on clay mixtures

Laaroussi, Najma; Lauriat, Guy; Garoum, Mohammed; Cherki, A.; Jannot, Yves

doi:10.1016/j.conbuildmat.2014.07.104

Cited by 51 publications

(12 citation statements)

References 9 publications

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“…We notice that we have nonhomogeneous boundary conditions and they are time functions (g(t)) so the resolution of system (1) cannot be done directly using the method of separation of variables. In the literature many authors have solved this system by the method of the Laplace transform [2], [4], [7], [10]. The thermogram of the temperature on the back face is then recovered by inverting theoretically or numerically the obtained solution in the Laplace space.…”

Section: A Mathematical Modelmentioning

confidence: 99%

Thermophysical Characterization of Earthen Materials Using the Flash Method

Chihab¹,

Garoum²,

Laaroussi³

2019

IJITEE

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Abstract, This work deals with the analytical solution of the rise temperature history on the back face of the unfired clay bricks related to the theoretical model of flash method, was calculated using Duhamel theorem. The local sensitivity analysis of the obtained solution shown that the sensitivity coefficients related to the thermal diffusivity and the adiabatic limit temperature meets the beck criterion for low time range, so these tow parameters can be simultaneously estimated with a good accuracy in this time range. Due to the slow convergence of the analytical solution in short times, the procedure for estimating the thermophysical properties is relatively slow. The theoretical analytical solution has therefore been replaced by an equivalent solution whose convergence speed was improved using the Wynn Epsilon method. The apparent thermal diffusivity and the adiabatic limit temperature of samples were then estimated by fitting measured rise temperature with the equivalent analytical solution. It is interesting to note the good agreement between the theoretical model with predicted values of parameters and the experimental data.

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Section: A Mathematical Modelmentioning

confidence: 99%

Thermophysical Characterization of Earthen Materials Using the Flash Method

Chihab¹,

Garoum²,

Laaroussi³

2019

IJITEE

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“…On the other hand, in the literature regarding the use of recycled products to make ceramics, researchers used a wide range of firing temperatures, from 700 to 1100 °C (1-7). The following tests were carried out on the fired specimens: true density (this did not include pore volume), and apparent density testing (including pore volume), according to the Spanish UNE 103301:1994 and UNE 103105:1993 standards (18,19); absorption test, according to UNE-EN 77221:2011 20; a capillary absorption test, according to UNE-EN 72211:2011 21; a compressive strength test, according to UNE-EN 7721:2011 22; a wet-frost-dry test, devised by Dr. Gabriel Barbeta (17), based on standards ASTM (23,24), NLT (25) and UNE (26); thermal conductivity measurement (a test at the experimental stage, very similar to the one used by other researchers), and the calibrated hot box test (27,28). Finally, to characterise the fired specimen in order to relate microstructure with properties, a scanning electronic microscopy analysis (SEM) was used, composed of Zeiss DSM 960A (20x to 2000000x) fitted out with signal detectors SE, BSE, CL; X-Ray by dissipation energies and microanalysis of X-ray Bruker Quantas 200 (resol.125 eV) associated to MER.…”

Section: Experimental Techniquesmentioning

confidence: 99%

The exploitation of sludge from aggregate plants in the manufacture of porous fired clay bricks

Trenado¹,

Marjanedas²,

Berthelsen-Molist³

et al. 2016

Mater. construcc.

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Aggregates (gravel and sand) are, after water, the Earth's second most used natural resource, representing about 50% of all consumed mineral resources. Aggregate production generates a large quantity of waste from the aggregate washing process. This waste is made up of suspended solids - sludge - which has a great environmental impact. It is deposited in huge troughs because of the impossibility of discharging it directly into rivers. Many plants have incorporated decanters and filter presses to separate the solid from the liquid fraction. This paper evaluates the possibility of exploiting the solid fraction (i.e. sludge) in the manufacture of fired clay bricks. The added value of these bricks is, on the one hand, the exploitation of sludge as a currently useless waste product, and on the other, the use of this sludge to enhance the physical and mechanical properties of conventional fired clay brick

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“…In recent years, the thermal behaviour of the materials that compose façades had been studied in depth by several authors such as Laaroussi et al [24] measuring the thermal properties of brick materials, Kuman and Suman [25] or Björk and Enochsson [26] measuring the properties of thermal insulation materials. However, when analysing the thermal transmittance of walls, assumed U-values have been a meaningful source of error in estimations of energy savings and carbon emissions [27].…”

Section: Introductionmentioning

confidence: 99%

Influence of HFM Thermal Contact on the Accuracy of In Situ Measurements of Façades’ U-Value in Operational Stage

2021

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Accurate information on the actual thermal transmittance of walls is vital to select appropriate energy-saving measures in existing buildings to meet the commitments of the European Green Deal. To obtain accurate results using the heat flow meter (HFM) method, good thermal contact must be made between the heat flow meter plate and the wall surface. This paper aimed to assess the influence of the non-perfect thermal contact of heat flow meter plates on the accuracy of in situ measurement of the façades’ U-value when a film was applied to avoid damage to the wall surface. Given the fact that to avoid harm to the wall surface, the laying of a film is a usual procedure in the installation of equipment during the building’s operational stage. The findings show that deviations between measured U-values when an HFM was installed directly on the wall surface and when an HFM was installed with a PVC film were found to differ significantly from the theoretical effect of including a PVC film during the monitoring process.

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Measurement of thermal properties of brick materials based on clay mixtures

Cited by 51 publications

References 9 publications

Thermophysical Characterization of Earthen Materials Using the Flash Method

Thermophysical Characterization of Earthen Materials Using the Flash Method

The exploitation of sludge from aggregate plants in the manufacture of porous fired clay bricks

Influence of HFM Thermal Contact on the Accuracy of In Situ Measurements of Façades’ U-Value in Operational Stage

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