@Moonrise you bring up a very good point about the Portland cement and CO2 emitted in production. Its about a 1 to 1 ratio of 1 ton CO2 emitted per 1 ton produced due to the heating process and the amount of fossil fuel burned to do so. https://www.geopolymer.org/fichiers_pdf/GEOASH.pdf
Check that link for information on a recipe (pg 4) that uses a less corrosive solution (Potassium Silicate solution) and cures at room temperature vs the alkali activated that needs some heat to cure if I'm not mistaken. Interesting to note that the compressive strength of the geopolymer cement in the paper is listed to be up to 95 kpa (much higher than traditional concrete). It also utilizes fly ash and slag which are waste products rather than the mostly mined raw materials Portland production uses.
Buenos dias! Me llamo Ignacio Acuña y estoy buscando proyectos para hacer o consultar en Latin America. Si tienen alguna duda o necesitan entrenamiento para hacer bloques o terminar su domo, yo le podria ayudar.