title: Fly ash based geopolymer thin coatings on metal substrates and its thermal evaluation.
abstract: Class F fly ash based Na-geopolymer formulations have been applied as fire resistant coatings on steel. The main variables for the coating formulations were Si: Al molar and water: cement weight ratios. We have determined that the adhesive strength of the coatings strongly depend on geopolymer composition. The ease with which geopolymer can be applied onto metal surfaces and the resultant thickness depend on the water content of the formulation. Adhesive strengths of greater than 3.5 MPa have been achieved on mild steel surfaces for compositions with Si:Al of 3.5. Microstructure evolution and thermal properties of the optimised coating formulations show that they have very promising fire resistant characteristics.
authors.affiliation: Centre for Materials Research, Department of Imaging and Applied Physics, Curtin University of Technology, PerthWA 6845 Australia. jtemuujin@yahoo.com
authors.forename: Jadambaa
authors.initials: J
authors.lastname: Temuujin
authors.forename: Amgalan
authors.initials: A
authors.lastname: Minjigmaa
authors.forename: William
authors.initials: W
authors.lastname: Rickard
authors.forename: Melissa
authors.initials: M
authors.lastname: Lee
authors.forename: Iestyn
authors.initials: I
authors.lastname: Williams
authors.forename: Arie
authors.initials: A
authors.lastname: van Riessen
mesh_terms: D002244:Carbon; D060729:Coal Ash; D018360:Crystallography, X-Ray; D008670:Metals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D052638:Particulate Matter; D011108:Polymers / Q000737:chemistry*
chemical_list: D060729:Coal Ash; D008670:Metals; D052638:Particulate Matter; D011108:Polymers; D002244:Carbon