Thermal conductivity measurement of thermal insulating mortars with EPS and silica aerogel by steady-state and transient methods

Gomes, M. Glória; Flores‐Colen, Inês; Silva, F. da; Pedroso, Marco

doi:10.1016/j.conbuildmat.2018.03.162

Cited by 82 publications

(25 citation statements)

References 39 publications

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“…However, this behaviour can be explained by an extra curing effect caused by freezing/thawing cycles due to the Na + [59,60] that compensate to some extent the external degradation. These results meet the study of Zhang & Gjorv [61] (as quoted by [62]) that obtained equal or even better durability for lightweight aggregate concrete than standard concrete, even when subjected to severe conditions.…”

Section: Freeze/thaw Accelerated Agingsupporting

confidence: 91%

“…The Young's modulus was determined according to ASTM E 1876-1 [80], through the resonant frequency of the flexural vibration mode obtained with the equipment GrindoSonic MK5 "Industrial". The thermal conductivity was evaluated by the transient method with the ISOMET 2114 device, in line with ASTM D 5930 [81], and was considered as suitable method for testing in small scale samples [62]. These properties were evaluated before and after aging tests.…”

Section: Methodsmentioning

confidence: 99%

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Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene

Morgado

Soares

Flores‐Colen

et al. 2021

Gels

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Following the trend of energy-efficient construction, renders with thermal insulation properties have been studied for replacing conventional renders. However, there are still few studies on the durability of these renders that may become a barrier for their implementation. In this study, the performance of lightweight renders for thermal insulation to accelerated aging cycles and freeze/thaw cycles is discussed. For this purpose, renders with regranulated expanded cork (GEC), silica aerogel (SA), and expanded polystyrene (EPS) were produced and tested for compressive strength, ultra-sound velocity, Young’s modulus, and thermal conductivity before and after accelerated aging cycles (hygrothermal, IR and freeze/thaw cycles). With this study, a comparison between the influence of different aggregates on renders is carried out in order to understand their effect on different properties of renders.

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Section: Freeze/thaw Accelerated Agingsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene

Morgado

Soares

Flores‐Colen

et al. 2021

Gels

View full text Add to dashboard Cite

show abstract

“…Research works (laboratory) Silica aerogel [25,[65][66][67][68][69][70][71][72][73] S1 to S9 Research works (semi-industrial) Silica aerogel with others [25,[66][67][68][69] I1 to I21 Industrial product (industrial) EPS, cork, perlite, silica aerogel [74][75][76][77][78][79][80][81][82][83][84] Although all calculation procedures being widely known and easily found in statistics literature [85,86], their implementation using statistical software makes its analysis more complete. Therefore, all data was inserted into an Excel data matrix.…”

Section: L1 To L5mentioning

confidence: 99%

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

et al. 2020

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This research provides a statistical analysis of the mechanical and physical properties of thermal insulating mortars developed in the laboratory and by the industry with and without the incorporation of nanomaterials. This was evaluated by carrying out a uni and bivariate analysis, principal components and factor analysis, cluster analysis, and the application of regression models. The results show that it is possible to find associations between these mortars’ properties, but also how these formulations’ development can be approached in the future to achieve better overall performance. They also show that the use of nanomaterials, namely silica aerogel, significantly improved the mortars’ thermal insulation capabilities, allowing us to obtain mortar formulations with thermal conductivities below the values presented by classic thermal insulating materials. Therefore, with this investigation, other researchers can support their product-development choices when incorporating nanomaterials to reduce mortars’ thermal conductivities, increasing their production efficiency, overall multifunctionality, and sustainability.

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“…Santa et al [10] usan un dispositivo para medir la conductividad térmica en materiales aislantes por el método de placa guardada. Gomes et al [11] usan dos métodos para comparar sus resultados: régimen estacionario y transitorio, obteniendo diferentes resultados con ambos métodos. Buratti et al [7] desarrollaron un equipo consistente en una caja con un panel caliente y otro frío, para caracterizar materiales compuestos obteniendo valores del CT en rangos adecuados para considerarlos como aislantes térmicos prometedores en remodelación de edificios.…”

Section: Ingeniería Y Cienciaunclassified

Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario

2019

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101|Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario construcción, el tamaño de las muestras a evaluar y el método de medida, comparado con los métodos tradicionales para medir este parámetro.Palabras clave: Conductividad térmica; flujo de calor; aislantes térmicos; incertidumbre; consumo energético; construcción de edificaciones. AbstractA device to measure thermal conductivity in thermal insulating solid materials commonly used in buildings was developed following a one-dimensional model of heat flow through a plate of the material to be evaluated. The temperature gradient between the plate faces was measured as a function of time by means of a set of type T thermocouples. A circuit with commercial microcontrollers was designed to control the instrument's mechanisms, the acquisition and the treatment of data. In preliminary tests with some materials, thermal conductivity values similar to those reported in the literature were obtained by using a linear adjustment with R values between 0.90 and 0.98. This device turns out to be a good instrument for measuring thermal conductivity because it has several advantages, such as: easy implementation, sample size, measurement method; compared to those using traditional methods.

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Thermal conductivity measurement of thermal insulating mortars with EPS and silica aerogel by steady-state and transient methods

Cited by 82 publications

References 39 publications

Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene

Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario

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