Effect of Thickness on the Thermal Properties of Thick Specimens of Low-Density Thermal Insulation

Shirtliffe, CJ

doi:10.1520/stp29265s

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…So is the thickness of the specimen, which is related to the "thickness effect" known from the literature for low density materials. The apparent thermal conductivity, measured under stationary heat flow conditions, clearly differs with differing specimen thickness, which is mainly influenced by the density of the material and the emittance of the measuring apparatus plates [38].…”

Section: Research On Thermal Conductivity Of Autoclaved Aerated Concretementioning

confidence: 99%

Review of selected aspects of shaping of physical, mechanical and thermal properties and manufacturing technology of lightweight and ultra-lightweight autoclaved aerated concrete

2023

Archives of Civil Engineering

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The paper provides an overview of selected scientific articles presenting research carried out in recent years on methods for producing autoclaved aerated concrete. Traditional technologies are briefly presented, together with innovative solutions for the production of low-density and ultra-lowdensity materials. In addition to the presentation of the manufacturing methods themselves, the results of research into the properties of the autoclaved aerated concrete obtained and their dependence on the technology used are also presented. A subjective selection and review of articles covering research into the thermal conductivity of concrete, the technological factors influencing them and the ways in which they can be shaped was also carried out. A significant number of the cited articles do not function in the world scientific circulation due to the language barrier (they are mainly in Ukrainian). In the meantime, they contain interesting research results which can inspire further research into the issues discussed concerning the production technology and the thermal and strength properties of autoclaved aerated concrete, with particular emphasis on lightweight and ultra-lightweight concrete.

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Section: Research On Thermal Conductivity Of Autoclaved Aerated Concretementioning

confidence: 99%

Review of selected aspects of shaping of physical, mechanical and thermal properties and manufacturing technology of lightweight and ultra-lightweight autoclaved aerated concrete

2023

Archives of Civil Engineering

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“…Temperature reduction of the metal disc is noted with time (and here be sure that the disc loses heat gradually under the same conditions) with the sample remaining above the disc, recording the temperature of the disc within half a minute until (7 to 10) degrees above and below the stability temperature (T 2 ). Then these readings are converted to a graphic curve showing the relationship between temperature and time as shown in figure (5).The point of stability is located on the plotting curve (cooling curve) and a line drawn straightly through this point as tangent to the curve. The slope at this point represents the temperature rate of reduction with time.…”

Section: Composite Samples Preparationmentioning

confidence: 99%

“…Battacharyya, 1980 [4] also conducted a experimental study where he proved that the thermal conductivity of the insulator is the rate of thermal conductivity of the fibers when they are perpendicular or parallel to the direction of heat transfer. Shirtliffe, 1980 [5] conducted many studies and researches on heat transfer in fibrous insulating materials, he reached several mathematical models for the relationship of thermal conductivity with the volumetric ratio of each of the fibrous material and the gas gaps inside it. Hammoud 1983 [6], he studied the possibility of using rice husks as a thermal insulator, who in turn used two-sample hot plate apparatus to measure the thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Evaluation of Proper Building Thermal Insulation Materials

Khider¹,

Mostafa²,

Azeez³

et al. 2022

IRJIET

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In this research, an empirical work study to investigate the thermal insulation properties of a mixture of some selected wastes of different composition, represented by (polyethylene, Styropor, active carbon, and rubber) for a purpose to use in a building isolation. These wastes are mixed with cement using a different volumetric percentage ratio as (10 to 30) percentage, with 5% increase for each test trial. A Lee's Disc, apparatus is used to measure the thermal conductivity for each constructed mold. Through which the thermal conductivity of the proportions added with cement is determined. Knowing this fact, the effect of these additives on the effectiveness and quality as an insulating mixture is analyzed and compared with each other to get finally the best possible mixture ratio.From the preliminary examinations, it is found that all the mixing materials prepared with their volume ratios mention above, have a good thermal insulation property as its thermal conductivity rate does not exceed the range of (0.300835). This value is located below the average in the heat-conducting materials scale, especially for thermal insulators used for concrete prepared for work construction.Tests are conducted on the prepared samples to get in mind the effect of these insulating materials with their indicated percentages on the cement insulating behavior, leading finally to the choose of the best ones. The obtained results and readings of these samples are compared with the results taken from the cement without any additives. All experimental results proved that the behavior of the thermal conductivity coefficient with their additive indicated are versible relation with the percentage step up of the volume ratio. In addition, (active carbon mixture) is chosen as the best mixing insulating material, specifically at the mixing ratio of (30%) ranged.

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“…When a small amount of opaque solid material is distributed throughout an air space, it inhibits heat transfer by convection and radiation while contributing little to conduc tion, thereby raising the value of the thermal resistance of the space. Solids such as glass, rock and plastic that provide little resistance to heat flow can be used in this way to pro duce good insulation [19]. The closed-cell type of insulation can have gases other than air in the cells and thus can have resistances higher than are possible for air-filled materials.…”

Section: Structure O F Insulationmentioning

confidence: 99%

“…Heat is more easily transferred across a flake or fiber insulation containing a few large air spaces than across a material with many small air spaces. Thus, for a given mean temperature and temperature difference, there is an optimum density at which a material is most efficient in reducing heat flow [19]. Therefore, conductivity decreases with in creasing density until the lowest conductivity is reached, then increases with further in creases in density as per…”

Section: Temperaturementioning

confidence: 99%

Measurement of thermal conductivity of smaller thermal insulation specimens using standard heat flow meter apparatus

Girardi¹

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Effect of Thickness on the Thermal Properties of Thick Specimens of Low-Density Thermal Insulation

Abstract: /npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at

Cited by 8 publications

References 1 publication

Review of selected aspects of shaping of physical, mechanical and thermal properties and manufacturing technology of lightweight and ultra-lightweight autoclaved aerated concrete

Review of selected aspects of shaping of physical, mechanical and thermal properties and manufacturing technology of lightweight and ultra-lightweight autoclaved aerated concrete

Fabrication and Evaluation of Proper Building Thermal Insulation Materials

Measurement of thermal conductivity of smaller thermal insulation specimens using standard heat flow meter apparatus

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