This Industrial waste-based geopolymer concrete innovation is in manufacturing spun-pile type pre-cast concrete. Indonesia is one of the largest nickel-producing countries in the world. In 2018, 25% of nickel ore production was in Indonesia. With Law No. 3 of 2014 regarding the prohibition of raw ore exports, almost all nickel ore and other non-ferrous metal ores, namely bauxite and copper, are processed in Indonesia. At the end of 2014, 24 smelters were operating in Indonesia, mostly in Central Sulawesi and Southeast Sulawesi. The smelting process of metal ores into metal produces waste called slag. Specifically for nickel, 80% of the ore processed will become slag. With a capacity of 15.6 million tons per year in the 2015-2019 period for nickel ore alone, one can imagine the huge amount of slag produced. Geopolymers are silicon and aluminum atoms bonded to oxygen into a polymeric network. Geopolymers are prepared through the dissolution and polycondensation reactions between aluminosilicate binders and alkaline silicate solutions such as mixed alkali metal silicates and metal hydroxides. This innovation creates a geopolymer concrete with a ratio of Na2SiO3 : NaOH from 1.5 to 2.5 intervals using a superplasticizer-type admixture with a percentage of 1% to 2%. In this invention, concrete is cured using steam at a temperature of 60°C for 4 hours without a rest period and 24 hours with a rest period. The ratio of alkaline solution to binders is 0.35 and 0.44, while the molarity levels used are 4M, 6M, 8M and 12 M.