Our friends at This Old House have a great post on how to quickly patch a cementÂ floor. They basically suggest four steps. We will summarize them here, but we suggest reading the full article for more detail.
- Level and undercut the bottom of the hole
- Brush on bonding liquid
- Add concrete to the hole
Keep in mind, this sounds simple but it does require some skill. Many manufacturers also make vinyl and epoxy compounds that will do the same thing.