The DOI matches its Crossref record; 47 of the 47 references it cites were found in a registry or an index.
Mechanical and thermal characterisation of geopolymers based on silicate-activated metakaolin/slag blends
Open accessAbstract
This article assesses the effect of mix design parameters on the compressive strength and thermal performance of alkali silicate-activated blends of metakaolin (MK) and granulated blast furnace slag (GBFS). A strong interrelationship between the effects of activator composition and the GBFS/(GBFS + MK) ratio is identified through statistical analysis of compressive strength data. Pastes formulated with higher SiO2/Al2O3 molar ratios show improvements in mechanical strength with increasing GBFS addition, associated with the formation of a structure comprising coexisting aluminosilicate ‘geopolymer’ gel and Ca-rich Al-substituted silicate hydrate (C-(A)-S-H) reaction products. The inclusion of GBFS in MK-based geopolymers seems also to improve their performance when exposed to high temperatures, as higher residual compressive strengths are reported for these mixtures compared to solely MK-based systems. Only slight differences in shrinkage behaviour are observed at temperatures of up to 600 °C with the inclusion of GBFS; however, slag-blended pastes exhibit enhanced stability at temperatures exceeding 800 °C, as no variation in the compressive strength and no additional shrinkage are identified. These results suggest that nanostructural modifications are induced in the gel by the inclusion of GBFS into MK-based geopolymers, improving the overall performance of these materials.
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Cites
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Self-citationMicrostructural changes in alkali activated fly ash/slag geopolymers with sulfate exposure
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Metadata
- Authors
- Bernal, S. A., Rodríguez, E. D., Mejía de Gutiérrez, R., Gordillo, M., & Provis, J. L.
- Venue
- Journal of Materials Science
- Published
- 2011-08
- Volume
- 46
- Issue
- 16
- Pages
- 5477-5486
- ISSN
- 0022-2461 (ISSN-L)
- 1573-4803
- OpenAlex
- W2067064760
- Cited by
- 414
- References
- 47
- FWCI
- 49.00
- Type
- journal article
- Language
- en
- Open access
- green
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- Bernal, S. A., Rodríguez, E. D., Mejía de Gutiérrez, R., Gordillo, M., & Provis, J. L. (2011). Mechanical and thermal characterisation of geopolymers based on silicate-activated metakaolin/slag blends. Journal of Materials Science. https://doi.org/10.1007/s10853-011-5490-z
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