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 <i>λ</i>, specifically heat <i>Cp</i> and thermal diffusivity <i>a</i> of modified gypsum and geopolymer. Microspheres, hydroxyethyl methylce...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/8/1220 |
| _version_ | 1797538245125341184 |
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| author | Karol Prałat Justyna Ciemnicka Artur Koper Katarzyna Ewa Buczkowska Piotr Łoś |
| author_facet | Karol Prałat Justyna Ciemnicka Artur Koper Katarzyna Ewa Buczkowska Piotr Łoś |
| author_sort | Karol Prałat |
| collection | DOAJ |
| description | The paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient <i>λ</i>, specifically heat <i>Cp</i> and thermal diffusivity <i>a</i> 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. |
| first_indexed | 2024-03-10T12:27:48Z |
| format | Article |
| id | doaj.art-30286e0a602e4855bb4616b3a9bae724 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T12:27:48Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-30286e0a602e4855bb4616b3a9bae7242023-11-21T14:53:16ZengMDPI AGPolymers2073-43602021-04-01138122010.3390/polym13081220Comparison of the Thermal Properties of Geopolymer and Modified GypsumKarol Prałat0Justyna Ciemnicka1Artur Koper2Katarzyna Ewa Buczkowska3Piotr Łoś4Faculty of Civil Engineering, Mechanics and Petrochemistry, Institute of Building, Warsaw University of Technology, I. Łukasiewicza 17, 09-400 Płock, PolandFaculty of Civil Engineering, Mechanics and Petrochemistry, Institute of Building, Warsaw University of Technology, I. Łukasiewicza 17, 09-400 Płock, PolandFaculty of Civil Engineering, Mechanics and Petrochemistry, Institute of Building, Warsaw University of Technology, I. Łukasiewicza 17, 09-400 Płock, PolandDepartment of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, Studentska 2, 461-17 Liberec, Czech RepublicDepartment of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, Studentska 2, 461-17 Liberec, Czech RepublicThe paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient <i>λ</i>, specifically heat <i>Cp</i> and thermal diffusivity <i>a</i> 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.https://www.mdpi.com/2073-4360/13/8/1220thermal propertiesthermal conductivitymicro additivesgeopolymergypsum |
| spellingShingle | Karol Prałat Justyna Ciemnicka Artur Koper Katarzyna Ewa Buczkowska Piotr Łoś Comparison of the Thermal Properties of Geopolymer and Modified Gypsum Polymers thermal properties thermal conductivity micro additives geopolymer 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 | thermal properties thermal conductivity micro additives geopolymer gypsum |
| url | https://www.mdpi.com/2073-4360/13/8/1220 |
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