Larasati, Deka, Dwi Nurtanto, & Nanin Meyfa Utami.
" Effect of Duck Egg Shell Ash with Fly Ash as Cement Substitution in Geopolymer Concrete." <em>BERKALA SAINSTEK</em> [Online], 10.2 (2022): 51-57. Web. 19 Dec. 2024