I'm going to start a research on interlocking bricks using Coal Ash by varying key depth. But I'm little bit confused about the key depth like what should be starting key depth 20mm, 25mm, 30mm and so on.
Actually I want to check the mechanical and durability performance of Coal Ash interlocking bricks by varying key depth.
So can you give me a favor or provide any reputable journal regarding varying key depth of interlocking bricks