https://mts.intechopen.com/articles/show/title/structural-and-chemical-analysis-of-new-cement-based-on-eggshells-and-sand-from-dunes-southern-west-In this chapter, we present our study of geopolymers and hybrid geopolymers synthesized with treated fly ash from eggshells (FAES) and sand from the dunes of southern Algeria using activators such as NaOH and Na2SiO3, respectively, in addition to the…