The Schmidt Hammer test is also known as a Swiss Hammer, Rebound Hammer or Concrete Hammer test.

The process involves hitting concrete with a spring-driven pin at a defined energy, and then measuring the rebound.

This test method is based on the principle that the rebound of an elastic mass depends on the hardness of the concrete surface against which the mass strikes.

The rebound depends on the surface hardness of the concrete and is measured by specialized test equipment.

The rebound result of the test can be used to determine the compressive strength of the concrete.