Study of the synergistic impact of Fe3O4, Na2CO3 and organic C on kaolin-based lightweight aggregates by a DOE (Mixture Experiments) approach
Fecha
2023-11-03
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Editor
Elsevier
Resumen
The compositional synergies involved in the thermal formation of lightweight aggregates (LWAs) have been investigated through four pure phases: non-expansive kaolin (K); cork powder (C); sodium carbonate (N) and magnetite-Fe3O4 (M). Mixture Experiments has been applied for formulation, modeling and optimization. LWAs have been manufactured from 36 starting mixtures and the main technological properties have been characterized: bloating index (BI), particle density (ρrd), water absorption (WA24) and crushing strength (S). Maximum BI and WA24 together with minimum density are associated with the addition of a significant amount of iron phase in combination with small proportions of organic carbon (Optimal [BI > 60%]: 56.0% K + 40.2% M + 3.9% C + 0% N), while S increases antagonistically with expansion. Iron reduction by incomplete combustion of C appears to be critical in pore formation and concomitant bloating. N has enhanced the sphericity of the expanded specimens. The contrast between experimental and estimated data has shown that the models have generally performed very well.
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Palabras clave
Lightweight aggregate, Iron, Na2CO3, Organic carbon, Mixture Experiments
Citación
José Manuel Moreno-Maroto, Carlos Javier Cobo-Ceacero, Ana M. Martínez-Rodríguez, Antonio Conde-Sánchez, Beatriz González-Corrochano, Jacinto Alonso-Azcárate, Manuel Uceda-Rodríguez, Ana B. López, Carmen Martínez-García, Teresa Cotes-Palomino, Study of the synergistic impact of Fe3O4, Na2CO3 and organic C on kaolin-based lightweight aggregates by a DOE (Mixture Experiments) approach, Construction and Building Materials, Volume 403, 2023, 133152, https://doi.org/10.1016/j.conbuildmat.2023.133152.