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  • Geopolymer is a term covering a class of synthetic aluminosilicate materials with potential use in a number of areas, essentially as a replacement for Portland cement and for advanced high-tech composites, ceramic applications or as a form of cast stone.
  • Geopolymer binders and geopolymer cements are generally formed by reaction of an aluminosilicate powder with an alkaline silicate solution at roughly ambient conditions.
  • Geopolymer cements can also be made from sources of pozzolanic materials, such as lava or fly ash from coal.
  • Geopolymer concrete based on pozzolana is a new material that does not need the presence of Portland cement as a binder.
  • Since no limestone is used as a material, geopolymer cement has excellent properties within both acid and salt environments.
  • Sea water can be used for the blending of the geopolymer cement.
  • Geopolymer materials represent an innovative technology that is generating considerable interest in the construction industry, particularly in light of the ongoing emphasis on sustainability.
  • User-friendly geopolymer cements that can be used under conditions similar to those suitable for portland cement are the current focus of extensive world-wide research efforts.
  • The production of versatile, cost-effective geopolymer cements that can be mixed and hardened essentially like portland cement would represent a “game changing” advancement, revolutionizing the construction of transportation infrastructure.
  • Geopolymerisation starts with the alkalination step involving NaOH or KOH. Its mechanism can be followed with MAS-NMR spectroscopy.
  • The fly ash-based geopolymer paste binds the loose coarse aggregates, fine aggregates and other un-reacted materials together to form the geopolymer concrete, with or without the presence of admixtures. The manufacture of geopolymer concrete is carried out using the usual concrete technology methods.
  • Geopolymers are made of inorganic polymers.
  • The properties and uses of geopolymers are being explored in many scientific and industrial disciplines such as modern inorganic chemistry, physical chemistry, colloid chemistry and in all types of engineering process technologies.

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