This question is regarding the rear entrance to my basement. I have to pour a "step up" which will act as a curb for drainage to prevent water from coming into the basement. Basically, the area will be about 16 Sqft, and about 8" deep. This would turn out to be quite a few bags of concrete.

At the same time, I have a ton of old bricks doing nothing under a crawl space in my deck. I figured why not kill 2 birds with 1 stone and place the bricks in the area, thereby using less concrete.

Right now, I laid out a layer of bricks across the whole area, and a second layer, perpandicular to the first and on top. This leaves about 2-3" of cover for concrete. I was thinking to mix up a batch of concrete and throw it over these bricks, (into the mold I built, of course). Is there anything wrong with this? Should I put concrete over the first layer of bricks before placing the second layer of bricks? Will there be stability problems? The area I was most concerned with is at the "step up", that the weight on the edge (top corner) would cause something to destabilize, and break free. I tried looking this up online, but strangely, couldn't find any information. I will be tiling the whole thing with 12" tiles.

Please let me know if this is ok, I wanted to start this project after work today, thanks!