Behavior of calcined clay based geopolymers under sulfuric acid attack: Meta-illite and metakaolin
Résumé
This paper studies the behavior of four different calcined clay-based geopolymers under sulfuric acid attack and
gives insights into their degradation mechanisms. Pastes were cast using metakaolin and meta-illite and were
activated by two different alkaline solutions. Mineralogical and microscopic characterizations were performed
on pastes before and after attack. Results indicated that all pastes were affected by low leaching of alkali cations,
and thus by a linkage disequilibrium of the geopolymer network. Meta-illite based geopolymers, which had not
been addressed in the literature until now, hold promise for improving the durability of materials in aggressive
environments.
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