title: Influence of alkali cation on the mechanical properties and durability of fly ash based geopolymers.
abstract: This research has provided information about the influence of alkali cations (Na+ and K+) on the mechanical properties and durability of fly ash based geopolymers. The results have shown that alkali cations have a strong influence on the mechanical properties of fly ash based geopolymers. K-geopolymers generally reach a higher value of compressive strength in comparison to Na- geopolymers. On the other hand, microstructure and phase composition of fly ash based geopolymers are not influenced by the nature of alkali cations. The ratio of main gel structure forming elements is practically not affected by the nature of alkali cations. Durability of fly ash based geopolymers in different aquatic environments is greatly dependent on the choice of alkali cations. Na- geopolymers are generally more resistant in water and aggressive environments than the K-geopolymers. The best durability of fly ash based geopolymers was observed in sea water.
authors.forename: Irena
authors.initials: I
authors.lastname: Nikolić
authors.forename: Radomir
authors.initials: R
authors.lastname: Zejak
authors.forename: Ivona
authors.initials: I
authors.lastname: Jankovič-Častvan
authors.forename: Ljiljana
authors.initials: L
authors.lastname: Karanović
authors.forename: Vuk
authors.initials: V
authors.lastname: Radmilović
authors.forename: Velimir
authors.initials: V
authors.lastname: Radmilović
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D060729:Coal Ash / Q000737:chemistry*; D019245:Compressive Strength; D052638:Particulate Matter; D011108:Polymers / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000468:Alkalies; D060729:Coal Ash; D052638:Particulate Matter; D011108:Polymers; D012964:Sodium; D011188:Potassium