Durability of fly ash geopolymer mortars in nitric acid–effect of alkali (Na2o) content. Journal of Civil Engineering and Management, [S. l.], v. 17, n. 3, p. 393–399, 2011. DOI: 10.3846/13923730.2011.594225. Disponível em: https://journals.vilniustech.lt/index.php/JCEM/article/view/5235. Acesso em: 9 may. 2025.