A view of microstructure with technological behavior of waste incorporated ceramic bricks

• TG–DTA analysis of raw clay (Kaolinite).
• Study of technological properties for recycled ceramic bricks.
• Supportive microscopic observation through SEM analysis.
• Provides an optimum temperature and composition for the recycling of ceramic rejects.

Production of ceramic bricks from mixtures of ceramic industry wastes (up to 50 wt%) from the area of Vriddhachalam, Cuddalore district, Tamilnadu, India and kaolinitic clay from Thiruvananthapuram district, Kerala were investigated. The firing behavior of the ceramic mixtures was studied by determining their changes in mineralogy and basic ceramic properties such as water absorption, porosity, compressive strength and firing shrinkage at temperatures ranging from 900 to 1200 °C in short firing cycles. The effect of the rejects addition gradually up to 50 wt% was analyzed with the variation of temperature on the mechanical properties and microstructure of the bricks. The highest compressive strength and lowest water absorption is observed for the sample with 40% rejects at 1100 °C which is supported by the results of SEM analysis. The resulting ceramic bricks exhibit features that suggest possibilities of using the ceramic rejects in the conventional brick making methods.

TG–DTA curve for raw clay (Kaolinite).Figure optionsDownload as PowerPoint slide