Menéndez, Esperanza, Cristina Argiz, and Miguel íngel Sanjuán. “Coal Ash Portland Cement Mortars Sulphate Resistance”. Civil Engineering Journal 7, no. 1 (January 1, 2021): 98–106. Accessed November 6, 2025. https://civilejournal.org/index.php/cej/article/view/2550.