This summer I rearranged all of the brick around the front landscaping. There were two adjacent corners, and with my new design, I just loped the corners off and made a 45-degree angle across instead. In doing so, I now have a void that needs to be filled in. In the first pic, I am looking at the front of it. In the second pic, I am facing at the side of it. What I would like to do is get this filled in soon. I was thinking of having someone do it, but it seems like something I could do myself. I am borrowing a B&D masonry book from the library, but still have questions: Would I only need to use a board to separate between the brick wall and the void, meaning is it OK to allow the newly poured concrete to make direct contact with the older concrete? The driveway is flat, but that sidewalk section has a grade to it, about 10 degrees. Is there a trick to filling in concrete at a grade? It seems like it would be thick enough to keep it's shape without drooping due to gravity, but I really have no idea. Is there a good method to match a concrete mix with the preexisting concrete of my driveway? Is it a good idea to add pebbles and sand to the ground first (to prevent erosion)? So far I am looking at using this: QUIKRETE® - Crack-Resistant Concrete Mix Any good? Thanks in advance for all input.