Preparation of sample
Rock dust and clay sample were ground in powder form, and dried in air. Different percentages of rock dust (10–50%) were thoroughly mixed with clay and granulated for better compaction using 5% moisture. The test specimens were rectangular (50 mm × 50 mm × ∼15 mm) in size (Fig.1). The specimens were air dried at room temperature for 24hr and then oven dried at 110 °C for another 24 h to remove moisture content. All the specimens were fired at 850–1100 °C temperature in a muffle furnace for 1 h under heating rate of 10 °C/min. Then various physical properties of prepared samples were analyzed.