Chemical durability evaluation of sintered fly ash based chemical durability evaluation of sintered fly ash based glass

In order to preserve the environment, the strategy of economic development in the world is based on the use of waste as a raw material for obtaining new products. Waste can be used in the same industry in which it was produced or in other industries. This paper presents an examination of the chemical durability of glass-ceramics obtained by sintering fly ash glass at characteristic temperatures (850 and 900°C). The chemical stability of the glass-ceramics was tested in three solvents, distilled water, HCl (0.01 mol/dm3) and NaOH (0.01 mol/dm3). The results indicate that the chemical durability of glass sintered at 900°C is slightly lower than glass-ceramic sintered at 850°C. The higher chemical durability of the glass-ceramic sintered at 850°C can be attributed to the presence of wollastonite, which was not detected in the glass-ceramic sintered at 900°C. The obtained glassceramics has a high chemical durability, with mass changes below 1%. FTIR and SEM analysis of the samples after dissolution revealed that there was no disruption of the structure.