Concrete contractors who are required to perform concrete core strength tests have a few options when it comes to core drilling. They can hire a testing lab or concrete sawing and drilling company to drill the cores, or they can choose to drill the cores themselves. Regardless of who drills the cores, make sure you have a written core test program that considers the proper place in a wall or slab from which to extract cores and how to handle cores once you remove them from the concrete.
A core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core.
Core drilling can be done more rapidly since much less material needs to be removed than with a standard bit. This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone.