1. High temperature behavior of sodium and potassium volcanic ashes-based alkali-activated materials (Mt. Etna, Italy).
- Author
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Scanferla, Paolo, Finocchiaro, Claudio, Gharzouni, Ameni, Barone, Germana, Mazzoleni, Paolo, and Rossignol, Sylvie
- Subjects
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HIGH temperatures , *SODIUM , *THERMAL stability , *COMPRESSIVE strength , *POTASSIUM , *ALKALINE earth metals , *VOLCANIC ash, tuff, etc. - Abstract
[Display omitted] • Evaluation of activating solution influence on high temperature resistance in AAMs. • Higher availability of silicon and aluminum and better feasibility of the pastes. • Monitoring formation of Si-O-Si and Si-O-Ca networks. • Positive influence of the new crystallizations on mechanical resistance after 1000 °C. • Densification behavior of K sample contrary to the melting of that Na. Thermal performances at 1000 °C of volcanic ash-based alkali-activated materials by both sodium or potassium solutions have been tested. Once defined the feasibility for the potassium set, a multidisciplinary characterization including spectroscopic, thermal, mechanical, diffractometric before and after treatment and dilatometric analyses was applied. The formation kinetics of different networks was evaluated. A correlation between the high mechanical properties and the least amount of water was observed in non-treated samples. Treated samples at 1000 °C showed higher compressive strengths due to the crystallization of wollastonite, leucite and nepheline. Thermal stability was observed increased with the solid content in the potassium-based formulations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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