I removed a chimney from my house earlier this year. After everything was cleaned up, I was left with this big hole:
I have two questions: (1) How do I know what type of concrete to use? (2) How do I prep the hole before pouring/placing the concrete?
Some info: The hole is in my garage. It's about 2 or 3 feet deep. Surrounded on three sides by chimney brick and one side by the crawlspace foundation of my house. The bottom is dirt. The garage cement is pretty smooth, which you can see from the picture.