ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 63, (4) 365 - 373 (2019)

Le Van Su 1, Hájková Pavlína 1 ,2 , Kovacic Vladimir 1, Bakalova Totka 1, Volenský Lukáš 1,Le Chi Hiep 1, Ceccon Seifert Kevin 1, 3 , Pereira Peres Amanda 1, 3 , Louda Petr 1
1 Faculty of Mechanical Engineering, Department of Material Science, Technical University of Liberec, Studentská 2, 461 17 Liberec, Czech Republic
2 Unipetrol Centre for Research and Education, Revoluční 84, 400 01 Ústí nad Labem, Czech Republic
3 Department of Mechanical Engineering, Federal University of Rio Grande do Sul, Rua Sarmento Leite, no 425 - centro, Porto Alegre, RS, Cep 90050 - 170, Brazil

Keywords: Geopolymer, Porosity, Aluminium Powder, Basalt Fibres, Metakaolin, Silica Fume

Reinforced geopolymer foams were studied in this work as potential building materials. It has been widely assumed that for a given thermal conductivity [λ - W.m-1.K-1], geopolymer foams can have a lighter density than other materials. The study sought to test this assumption by comparing the thermal conductivity between geopolymer foams. The thermal conductivity λ was measured using an ISOMET 2014 device. In all the experiments, the geopolymer foams were obtained by adding aluminium powder and several combinations: silica fume and fine sand reinforced by short basalt fibres. Curing was carried out at room temperature and then in a furnace at 70 °C. After the curing process, the properties of the samples were tested at 7 and 28 days. The results show that the thermal conductivity, porosity, compressive strength, flexural strength and density for all of the tests ranged in the following values: 0.13 - 0.359 W.m-1.K-1; 41.8 - 62.5%; 1.94 - 9 MPa; 0.96 - 2.93 MPa; 546 - 1028 kg /m3, respectively. It was proven that the filler in the geopolymer foams has a significant influence on the mechanical and physical properties of the tested samples.

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doi: 10.13168/cs.2019.0032
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