Temperature stability of an argillite/K-geopolymer composite: Impact of argillite filler on dimensional behavior

Open Ceramics

Nathalie Texier-Mandoki¹  Sylvie Rossignol²  Svetlana Petlickaia²  Elodie Petit³  Guillaume Renaudin³  Sandrine Gomes³  Lawrence Frezet³ 

[1] Agence nationale pour la gestion des déchets radioactifs (Andra), 1/7 rue Jean Monnet, 92298, Châtenay-Malabry, Cedex, France;IRCER, Université de Limoges UMR3571, 12 rue Atlantis, 87068, Limoges, France;Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000, Clermont-Ferrand, France;

关键词: Geopolymers;    Filler;    Argillite;    Characterization;    Thermal treatment;   

DOI  :  

来源: DOAJ

【 摘 要 】

Pure model geopolymers present a promising potential for high-temperature binders for structural or coating applications. However, their well-known chemical stability, which can reach 1400 ​°C in the case of K-activated geopolymer, is accompanied by deleterious dimensional behavior, with significant shrinkage on heating. The work in the present paper focuses on the impact of tailored calcined argillite added to geomaterial formulations for fireproofing applications. Calcined argillite acts both as a filler and a reagent, with a supplementary delayed reaction activated by humidity and heat. K-activation of a mix of one-third metakaolin with two-thirds calcined argillite enables the shrinkage rate to be limited, and is accompanied by improved self-healing during viscous creep (allowing to preserve mechanical resistance at high temperature). This composite formulation preserves chemical stability, improves physical behavior, and maintains interesting mesoporosity for hydric properties. These different aspects are beneficial for a high temperature application.

【 授权许可】

Unknown