Cabrera Burga, Ulmaro, and Tulio Edgar Guillén Sheen. “Analysis of Compressive Strength by Adding Volcanic Tuff at 5%, 10% and 15% to the Mortar Cement - Sand”. LACCEI 1, no. 12 (April 9, 2025). Accessed May 18, 2026. https://proceedings.laccei.org/index.php/laccei/article/view/3646.