Some studies were focused on production opportunities of building bricks using fly ash. Demir used the method of firing Seyitömer power plant fly ash/clay bricks and obtained successful results. Another study that employed the method of curing under high pressure steam using the Seyitömer fly ash, slaked lime and sand at pre-determined ratios,
also obtained encouraging results [17]. Recently, studies were conducted towards the leaching behavior of heavy metals from fired and autoclaved [24] fly ash–lime bricks. The former was composed of 40% Seyitömer fly ash and 60% brick clay while the latter was containing 88% Seyitömer fly ash and 12% hydrated lime. In both studies, TCLP (toxicity characteristic leaching procedure) [Improved Method 1311] and ASTM Method A extraction procedure
were conducted on the whole fly ash brick pieces to determine the solubility values of the elements in their matrix. TCLP
method, simulating the solubility of the elements contained in the fly ash brick samples under a weak acid rain water environment, is used to check the leaching hazards of the solid wastes (it is especially suitable for the acidic wastes). The results for autoclaved fly ash lime bricks showed that the bricks produced with Seyitömer fly ash were environmentally sound in terms of the solubility of toxic elements