text: In June 2012, the institution ASTM International organized a symposium on Geopolymer Binder Systems. The introduction to the symposium states: When performance specifications for Portland cement were written, non-portland binders were uncommon...New binders such as geopolymers are being increasingly researched, marketed as specialty products, and explored for use in structural concrete. This symposium is intended to provide an opportunity for ASTM to consider whether the existing cement standards provide, on the one hand, an effective framework for further exploration of geopolymer binders and, on the other hand, reliable protection for users of these materials.
  The existing Portland cement standards are not adapted to geopolymer cements. They must be elaborated by an ad hoc committee. Yet, to do so, requires also the presence of standard geopolymer cements. Presently, every expert is presenting his own recipe based on local raw materials (wastes, by-products or extracted). There is a need for selecting the right geopolymer cement category. The 2012 State of the Geopolymer R&D, suggested to select two categories, namely:
  * type 2 slag/fly ash-based geopolymer cement: fly ashes are available in the major emerging countries; 
  * ferro-sialate-based geopolymer cement: this geological iron-rich raw material is present in all countries throughout the globe.
  along with the appropriate user-friendly geopolymeric reagent.