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Comparison of the Thermal Properties of Geopolymer and Modified Gypsum

The paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient λ, specifically heat Cp and thermal diffusivity a of modified gypsum and geopolymer. Microspheres, hydroxyethyl methylcellulose (HEMC) polymer, and aerogel were used as the gyps...

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Autores principales: Prałat, Karol, Ciemnicka, Justyna, Koper, Artur, Buczkowska, Katarzyna Ewa, Łoś, Piotr
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8069097/
https://www.ncbi.nlm.nih.gov/pubmed/33918819
http://dx.doi.org/10.3390/polym13081220
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author Prałat, Karol
Ciemnicka, Justyna
Koper, Artur
Buczkowska, Katarzyna Ewa
Łoś, Piotr
author_facet Prałat, Karol
Ciemnicka, Justyna
Koper, Artur
Buczkowska, Katarzyna Ewa
Łoś, Piotr
author_sort Prałat, Karol
collection PubMed
description The paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient λ, specifically heat Cp and thermal diffusivity a of modified gypsum and geopolymer. Microspheres, hydroxyethyl methylcellulose (HEMC) polymer, and aerogel were used as the gypsum’s modifying materials. The study also investigated an alkali potassium-activated methakaolin-based geopolymer with the addition of aluminium dust. During the measurements of thermal parameters, the nonstationary method was chosen, and an Isomet device—which recorded the required physical quantities—was used. When compared to the reference sample, a decrease in the thermal conductivity and diffusivity of the hardened gypsum— and a simultaneous increase in specific heat—was observed with the addition of micromaterials. The geopolymer sample was characterized by the lowest value of thermal conductivity, equal to 0.1141 W/(m·K). It was over 62% lower than the reference sample containing only gypsum. The experimental values of the thermal conductivity of the gypsum samples with the addition of HEMC, aerogel and microspheres were, respectively, over 23%, 6%, and 8% lower than those of the unmodified gypsum samples. The lowest values of thermal conductivity were observed in the case of the gypsum samples modified with polymer; this resulted from the fact that the polymer caused the greatest change in the structure of the gypsum’s composite, which were expressed by the lowest density and highest porosity.
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spelling pubmed-80690972021-04-26 Comparison of the Thermal Properties of Geopolymer and Modified Gypsum Prałat, Karol Ciemnicka, Justyna Koper, Artur Buczkowska, Katarzyna Ewa Łoś, Piotr Polymers (Basel) Article The paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient λ, specifically heat Cp and thermal diffusivity a of modified gypsum and geopolymer. Microspheres, hydroxyethyl methylcellulose (HEMC) polymer, and aerogel were used as the gypsum’s modifying materials. The study also investigated an alkali potassium-activated methakaolin-based geopolymer with the addition of aluminium dust. During the measurements of thermal parameters, the nonstationary method was chosen, and an Isomet device—which recorded the required physical quantities—was used. When compared to the reference sample, a decrease in the thermal conductivity and diffusivity of the hardened gypsum— and a simultaneous increase in specific heat—was observed with the addition of micromaterials. The geopolymer sample was characterized by the lowest value of thermal conductivity, equal to 0.1141 W/(m·K). It was over 62% lower than the reference sample containing only gypsum. The experimental values of the thermal conductivity of the gypsum samples with the addition of HEMC, aerogel and microspheres were, respectively, over 23%, 6%, and 8% lower than those of the unmodified gypsum samples. The lowest values of thermal conductivity were observed in the case of the gypsum samples modified with polymer; this resulted from the fact that the polymer caused the greatest change in the structure of the gypsum’s composite, which were expressed by the lowest density and highest porosity. MDPI 2021-04-09 /pmc/articles/PMC8069097/ /pubmed/33918819 http://dx.doi.org/10.3390/polym13081220 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Prałat, Karol
Ciemnicka, Justyna
Koper, Artur
Buczkowska, Katarzyna Ewa
Łoś, Piotr
Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title_full Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title_fullStr Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title_full_unstemmed Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title_short Comparison of the Thermal Properties of Geopolymer and Modified Gypsum
title_sort comparison of the thermal properties of geopolymer and modified gypsum
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8069097/
https://www.ncbi.nlm.nih.gov/pubmed/33918819
http://dx.doi.org/10.3390/polym13081220
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