Figure 3.

Preparation process of waste burnt brick powder (WBBP): (a) collection site of waste bricks; (b) collected bricks are crushed into smaller size and washed to remove dirt; (c) the wet pieces of waste bricks are dried under sunlight for 1 day; (d) The sun-dried sample is converted into powder using the ball milling process; (e) to remove any moisture content, the WBBP is oven-dried for 24 h; (f) the oven-dried powder is converted into ultrafine particles through manual pulverization, and then it is sieved through a 75 µm sieve and stored in airtight buckets.