Calcined clay consists of clay particles heated to high temperatures so that they resist breakdown into smaller particles. Which property describes this material?

• A. Increased Solubility
• B. Greater Resistance to Breakdown
• C. Softer Texture
• D. Higher Density

Answer: (B)

Calcined clay shows increased structural stability because heating drives off bound water and alters the particle bonding, making the grains hold together more tightly. This results in a material that resists crumbling or breaking into smaller pieces when subjected to stress or handling. That’s why the best description is greater resistance to breakdown.

Increasing solubility would imply it dissolves more easily, which isn’t what calcination does. A softer texture contradicts the stronger, more rigid structure formed by heating. Density can change with processing, but the key trait described here is how well the particles resist breaking apart.