Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites
In this study, the effect of different types of aluminosilicates on the thermo-mechanical properties of metakaolinite-based geopolymer binders and composites was examined. The metakaolinite-based geopolymer binders and composites were produced from three different types of aluminosilicates (one meta...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-11-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/14/22/4838 |
| _version_ | 1797464162363768832 |
|---|---|
| author | Jan Kohout Petr Koutník Pavlína Hájková Eliška Kohoutová Aleš Soukup |
| author_facet | Jan Kohout Petr Koutník Pavlína Hájková Eliška Kohoutová Aleš Soukup |
| author_sort | Jan Kohout |
| collection | DOAJ |
| description | In this study, the effect of different types of aluminosilicates on the thermo-mechanical properties of metakaolinite-based geopolymer binders and composites was examined. The metakaolinite-based geopolymer binders and composites were produced from three different types of aluminosilicates (one metakaolin and two calcined claystones) and a potassium alkaline activator. Chamotte was added as a filler, amounting to 65% by volume, to create geopolymer composites. Geopolymer binders were characterized by X-ray diffraction, rotary rheometer and scanning electron microscopy. The mechanical properties, thermal dilatation and thermal conductivity were investigated on geopolymer composites with three different aluminosilicates before and after exposure to high temperatures (up to 1200 °C). The results showed that the geopolymer binders prepared from calcined claystones had a lower dynamic viscosity (787 and 588 mPa·s) compared to the geopolymer binders prepared from metakaolin (1090 mPa·s). Geopolymer composites based on metakaolin had lower shrinkage (0.6%) and higher refractoriness (1520 °C) than geopolymers from calcined claystones (0.9% and 1.5%, 1500 °C and 1470 °C). Geopolymers based on calcined kaolinitic claystones are a promising material with higher compressive (95.2 and 71.5 MPa) and flexural strength (12.4 and 10.7 MPa) compared to geopolymers based on metakaolin (compressive strength 57.7 MPa). |
| first_indexed | 2024-03-09T18:03:04Z |
| format | Article |
| id | doaj.art-83ba2f8291ca4bb8a18db3f208a390c4 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T18:03:04Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-83ba2f8291ca4bb8a18db3f208a390c42023-11-24T09:41:48ZengMDPI AGPolymers2073-43602022-11-011422483810.3390/polym14224838Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer CompositesJan Kohout0Petr Koutník1Pavlína Hájková2Eliška Kohoutová3Aleš Soukup4ORLEN UniCRE a.s., Revoluční 1521/84, 400 01 Ústí nad Labem, Czech RepublicORLEN UniCRE a.s., Revoluční 1521/84, 400 01 Ústí nad Labem, Czech RepublicORLEN UniCRE a.s., Revoluční 1521/84, 400 01 Ústí nad Labem, Czech RepublicORLEN UniCRE a.s., Revoluční 1521/84, 400 01 Ústí nad Labem, Czech RepublicORLEN UniCRE a.s., Revoluční 1521/84, 400 01 Ústí nad Labem, Czech RepublicIn this study, the effect of different types of aluminosilicates on the thermo-mechanical properties of metakaolinite-based geopolymer binders and composites was examined. The metakaolinite-based geopolymer binders and composites were produced from three different types of aluminosilicates (one metakaolin and two calcined claystones) and a potassium alkaline activator. Chamotte was added as a filler, amounting to 65% by volume, to create geopolymer composites. Geopolymer binders were characterized by X-ray diffraction, rotary rheometer and scanning electron microscopy. The mechanical properties, thermal dilatation and thermal conductivity were investigated on geopolymer composites with three different aluminosilicates before and after exposure to high temperatures (up to 1200 °C). The results showed that the geopolymer binders prepared from calcined claystones had a lower dynamic viscosity (787 and 588 mPa·s) compared to the geopolymer binders prepared from metakaolin (1090 mPa·s). Geopolymer composites based on metakaolin had lower shrinkage (0.6%) and higher refractoriness (1520 °C) than geopolymers from calcined claystones (0.9% and 1.5%, 1500 °C and 1470 °C). Geopolymers based on calcined kaolinitic claystones are a promising material with higher compressive (95.2 and 71.5 MPa) and flexural strength (12.4 and 10.7 MPa) compared to geopolymers based on metakaolin (compressive strength 57.7 MPa).https://www.mdpi.com/2073-4360/14/22/4838metakaolinitegeopolymermetakaolinclaystonecharacterizationthermal properties |
| spellingShingle | Jan Kohout Petr Koutník Pavlína Hájková Eliška Kohoutová Aleš Soukup Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites Polymers metakaolinite geopolymer metakaolin claystone characterization thermal properties |
| title | Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites |
| title_full | Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites |
| title_fullStr | Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites |
| title_full_unstemmed | Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites |
| title_short | Effect of Different Types of Aluminosilicates on the Thermo-Mechanical Properties of Metakaolinite-Based Geopolymer Composites |
| title_sort | effect of different types of aluminosilicates on the thermo mechanical properties of metakaolinite based geopolymer composites |
| topic | metakaolinite geopolymer metakaolin claystone characterization thermal properties |
| url | https://www.mdpi.com/2073-4360/14/22/4838 |
| work_keys_str_mv | AT jankohout effectofdifferenttypesofaluminosilicatesonthethermomechanicalpropertiesofmetakaolinitebasedgeopolymercomposites AT petrkoutnik effectofdifferenttypesofaluminosilicatesonthethermomechanicalpropertiesofmetakaolinitebasedgeopolymercomposites AT pavlinahajkova effectofdifferenttypesofaluminosilicatesonthethermomechanicalpropertiesofmetakaolinitebasedgeopolymercomposites AT eliskakohoutova effectofdifferenttypesofaluminosilicatesonthethermomechanicalpropertiesofmetakaolinitebasedgeopolymercomposites AT alessoukup effectofdifferenttypesofaluminosilicatesonthethermomechanicalpropertiesofmetakaolinitebasedgeopolymercomposites |