In this part of the study, real size bricks were produced using the optimum conditions determined by the previous experiments presented in this paper. A concrete mixer which has 100 L of gross volume and 60 L of mixing capacity was employed for the preparation of the mixture consisting of 88% fly ash and 12% lime on dry basis. The moisture content of the mixture was kept at 20 wt.%. The wet mixture was later poured into a mould (200 200 300 mm) and was pressed at 62.5 kg f/cm2 using a 300 tons capacity hydraulic press to produce bricks 200 200 90–100 mm in size (Fig. 10). The pressed bricks were cured for 6 h in an autoclave (dia. 600 1200 mm) which is resistant up to 40 bars of steam pressure. Pressure and temperature of the autoclave are controlled automatically (Fig. 11).