Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories
Abstract This investigation demonstrated the effects of calcium aluminate cement’s total or partial replacement with a potassium-metakaolin-based geopolymeric binder (K-GP) in high-alumina castables. Experimental measurements were conducted to analyze the produced samples’ processing, microstructure...
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Associação Brasileira de Cerâmica
2025-03-01
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| Series: | Cerâmica |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132025000100307&tlng=en |
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| author | B. P. Bezerra A. P. Luz |
| author_facet | B. P. Bezerra A. P. Luz |
| author_sort | B. P. Bezerra |
| collection | DOAJ |
| description | Abstract This investigation demonstrated the effects of calcium aluminate cement’s total or partial replacement with a potassium-metakaolin-based geopolymeric binder (K-GP) in high-alumina castables. Experimental measurements were conducted to analyze the produced samples’ processing, microstructure, and properties after curing and firing (800-1400 °C). The results highlighted K-GP as a viable binder option for producing cement-free refractories. After firing at 1100-1400 °C, the improved properties of geopolymer-bonded refractories were attributed to their complex resultant microstructure, comprising alumina particles strongly adhered by a glassy phase and contained randomly distributed clusters of kaliophilite and/or leucite grains within the ceramic matrix. After firing at 1250 °C, the samples exhibited a promising set of properties: high thermal shock resistance, modulus of rupture of 17.01 MPa, Young’s modulus of 67.15 GPa, porosity of 16.85%, density of 2.87 g/cm³, and linear shrinkage of 0.33%. These properties are suitable for applications at intermediate temperatures (i.e., petrochemical and non-ferrous industries). |
| format | Article |
| id | doaj-art-c07fe3bc3cbb4b62ba016bc9f3f118c3 |
| institution | DOAJ |
| issn | 1678-4553 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Associação Brasileira de Cerâmica |
| record_format | Article |
| series | Cerâmica |
| spelling | doaj-art-c07fe3bc3cbb4b62ba016bc9f3f118c32025-08-20T02:53:44ZengAssociação Brasileira de CerâmicaCerâmica1678-45532025-03-017110.1590/mkwv7164Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractoriesB. P. BezerraA. P. Luzhttps://orcid.org/0000-0002-5941-5388Abstract This investigation demonstrated the effects of calcium aluminate cement’s total or partial replacement with a potassium-metakaolin-based geopolymeric binder (K-GP) in high-alumina castables. Experimental measurements were conducted to analyze the produced samples’ processing, microstructure, and properties after curing and firing (800-1400 °C). The results highlighted K-GP as a viable binder option for producing cement-free refractories. After firing at 1100-1400 °C, the improved properties of geopolymer-bonded refractories were attributed to their complex resultant microstructure, comprising alumina particles strongly adhered by a glassy phase and contained randomly distributed clusters of kaliophilite and/or leucite grains within the ceramic matrix. After firing at 1250 °C, the samples exhibited a promising set of properties: high thermal shock resistance, modulus of rupture of 17.01 MPa, Young’s modulus of 67.15 GPa, porosity of 16.85%, density of 2.87 g/cm³, and linear shrinkage of 0.33%. These properties are suitable for applications at intermediate temperatures (i.e., petrochemical and non-ferrous industries).http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132025000100307&tlng=enGeopolymerBinderCastableMetakaolinAlumina |
| spellingShingle | B. P. Bezerra A. P. Luz Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories Cerâmica Geopolymer Binder Castable Metakaolin Alumina |
| title | Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories |
| title_full | Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories |
| title_fullStr | Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories |
| title_full_unstemmed | Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories |
| title_short | Comparative assessment of calcium aluminate cement and potassium-metakaolin-based geopolymer as binders in high-alumina refractories |
| title_sort | comparative assessment of calcium aluminate cement and potassium metakaolin based geopolymer as binders in high alumina refractories |
| topic | Geopolymer Binder Castable Metakaolin Alumina |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132025000100307&tlng=en |
| work_keys_str_mv | AT bpbezerra comparativeassessmentofcalciumaluminatecementandpotassiummetakaolinbasedgeopolymerasbindersinhighaluminarefractories AT apluz comparativeassessmentofcalciumaluminatecementandpotassiummetakaolinbasedgeopolymerasbindersinhighaluminarefractories |