“…Therefore, mortar contained river sand or soil, as fine aggregate was used for comparison. The compressive strength of geopolymer mortar was relatively high in the studies conducted by Mashri et al (Mashri, Johari et al 2020) and Vivek and Mangai (Vivek and Alamelu Mangai 2023). However, in both cases, they used a high content of precursor in the geopolymer mix.…”