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Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool
https://orcid.org/0000-0003-2233-9745
https://orcid.org/0000-0001-8197-7216
https://orcid.org/0000-0001-6965-9338
https://orcid.org/0000-0001-8490-1890
Abstract This paper deals with the synthesis and thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings (Quartz Feldspar Sand; QFS) and glass wool (GW). One of the objectives of the study was to prepare materials encompassing a maximum amount of waste streams with some potential thermal stability. Several compositions were prepared with sodium metasilicate anhydrous (Na2SiO3) wt.% of 0.5, 2.5, 5, 10 and 12,5. The one-part metakaolin geopolymer composites were cured at 60 °C for 24 h and the mechanical properties were assessed at 7 days and after post-heat treatment at 500, 750, 1000, 1100 or 1200 °C. X-ray diffraction, dilatometry, scanning electron microscopy and thermogravimetry analyses were used to study the stability of the prepared geopolymer composites until 1100–1200 °C. The results showed that more than 20 MPa compressive strength could be achieved with metakaolin geopolymer composites containing only 20 wt% of metakaolin. Metakaolin-GW geopolymer composites were stable up to 500 °C. Meanwhile, their counterparts containing QFS were stable up to 1100–1200 °C; samples prepared with higher dosage of sodium (Na2SiO3 > 5 wt%) retained more than 50% of their initial strength after thermal treatment at 1100 °C. Interestingly, for dosages of Na2SiO3 ≤ 5 wt%, more than 300% increase of strength was observed after thermal treatment at 1100–1200 °C. The use of QFS limited the thermal shrinkage at mild temperatures (<1000 °C), but favoured densification and strength development at 1100–1200 °C.
Graphical abstract Display Omitted
Highlights Geopolymers with high volume (~80 wt%) of QFS/GW were prepared. Metakaolin- GW geopolymers were relatively stable until 500 °C. Metakaolin-spodumene tailings (QFS) geopolymers were stable until 1100–1200 °C. Milling and particle size fractioning of QFS affected the thermal evolution and properties. More than 300% strength increase was observed at 1100–1200 °C for samples with Na2SiO3 ≤ 5 wt%.
Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool
https://orcid.org/0000-0003-2233-9745
https://orcid.org/0000-0001-8197-7216
https://orcid.org/0000-0001-6965-9338
https://orcid.org/0000-0001-8490-1890
Abstract This paper deals with the synthesis and thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings (Quartz Feldspar Sand; QFS) and glass wool (GW). One of the objectives of the study was to prepare materials encompassing a maximum amount of waste streams with some potential thermal stability. Several compositions were prepared with sodium metasilicate anhydrous (Na2SiO3) wt.% of 0.5, 2.5, 5, 10 and 12,5. The one-part metakaolin geopolymer composites were cured at 60 °C for 24 h and the mechanical properties were assessed at 7 days and after post-heat treatment at 500, 750, 1000, 1100 or 1200 °C. X-ray diffraction, dilatometry, scanning electron microscopy and thermogravimetry analyses were used to study the stability of the prepared geopolymer composites until 1100–1200 °C. The results showed that more than 20 MPa compressive strength could be achieved with metakaolin geopolymer composites containing only 20 wt% of metakaolin. Metakaolin-GW geopolymer composites were stable up to 500 °C. Meanwhile, their counterparts containing QFS were stable up to 1100–1200 °C; samples prepared with higher dosage of sodium (Na2SiO3 > 5 wt%) retained more than 50% of their initial strength after thermal treatment at 1100 °C. Interestingly, for dosages of Na2SiO3 ≤ 5 wt%, more than 300% increase of strength was observed after thermal treatment at 1100–1200 °C. The use of QFS limited the thermal shrinkage at mild temperatures (<1000 °C), but favoured densification and strength development at 1100–1200 °C.
Graphical abstract Display Omitted
Highlights Geopolymers with high volume (~80 wt%) of QFS/GW were prepared. Metakaolin- GW geopolymers were relatively stable until 500 °C. Metakaolin-spodumene tailings (QFS) geopolymers were stable until 1100–1200 °C. Milling and particle size fractioning of QFS affected the thermal evolution and properties. More than 300% strength increase was observed at 1100–1200 °C for samples with Na2SiO3 ≤ 5 wt%.
Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool
https://orcid.org/0000-0003-2233-9745
https://orcid.org/0000-0001-8197-7216
https://orcid.org/0000-0001-6965-9338
https://orcid.org/0000-0001-8490-1890
Abstract This paper deals with the synthesis and thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings (Quartz Feldspar Sand; QFS) and glass wool (GW). One of the objectives of the study was to prepare materials encompassing a maximum amount of waste streams with some potential thermal stability. Several compositions were prepared with sodium metasilicate anhydrous (Na2SiO3) wt.% of 0.5, 2.5, 5, 10 and 12,5. The one-part metakaolin geopolymer composites were cured at 60 °C for 24 h and the mechanical properties were assessed at 7 days and after post-heat treatment at 500, 750, 1000, 1100 or 1200 °C. X-ray diffraction, dilatometry, scanning electron microscopy and thermogravimetry analyses were used to study the stability of the prepared geopolymer composites until 1100–1200 °C. The results showed that more than 20 MPa compressive strength could be achieved with metakaolin geopolymer composites containing only 20 wt% of metakaolin. Metakaolin-GW geopolymer composites were stable up to 500 °C. Meanwhile, their counterparts containing QFS were stable up to 1100–1200 °C; samples prepared with higher dosage of sodium (Na2SiO3 > 5 wt%) retained more than 50% of their initial strength after thermal treatment at 1100 °C. Interestingly, for dosages of Na2SiO3 ≤ 5 wt%, more than 300% increase of strength was observed after thermal treatment at 1100–1200 °C. The use of QFS limited the thermal shrinkage at mild temperatures (<1000 °C), but favoured densification and strength development at 1100–1200 °C.
Graphical abstract Display Omitted
Highlights Geopolymers with high volume (~80 wt%) of QFS/GW were prepared. Metakaolin- GW geopolymers were relatively stable until 500 °C. Metakaolin-spodumene tailings (QFS) geopolymers were stable until 1100–1200 °C. Milling and particle size fractioning of QFS affected the thermal evolution and properties. More than 300% strength increase was observed at 1100–1200 °C for samples with Na2SiO3 ≤ 5 wt%.
Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool
Lemougna, Patrick N. (author) / Adediran, Adeolu (author) / Yliniemi, Juho (author) / Ismailov, Arnold (author) / Levanen, Erkki (author) / Tanskanen, Pekka (author) / Kinnunen, Paivo (author) / Roning, Juha (author) / Illikainen, Mirja (author)
2020-08-21
Article (Journal)
Electronic Resource
English
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