Fly ash based geopolymer thin coatings on metal substrates and its thermal evaluation.
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.
Temuujin
Jadambaa
J
Centre for Materials Research, Department of Imaging and Applied Physics, Curtin University of Technology, PerthWA 6845 Australia. jtemuujin@yahoo.com
Minjigmaa
Amgalan
A
Rickard
William
W
Lee
Melissa
M
Williams
Iestyn
I
van Riessen
Arie
A
D002244:Carbon; D060729:Coal Ash; D018360:Crystallography, X-Ray; D008670:Metals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D052638:Particulate Matter; D011108:Polymers / Q000737:chemistry*
D060729:Coal Ash; D008670:Metals; D052638:Particulate Matter; D011108:Polymers; D002244:Carbon