What is a Schmidt Hammer?
A Schmidt hammer, also known as a Swiss hammer a rebound hammer, or a concrete hammer test, is a device to measure the elastic properties or strength of concrete or rock, mainly surface hardness and penetration resistance.
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What are the different types of Schmidt hammers?
Schmidt hammers are available from their original manufacturers in several different energy ranges. These include:
(i) Type L-0.735 Nm impact energy, (ii) Type N-2.207 Nm impact energy; and (iii) Type M-29.43 Nm impact energy.
Is the Schmidt hammer reliable?
Among the NDT and MDT procedures, the Schmidt, or rebound, Hammer test is largely the most commonly used worldwide.
The reason for such a success is not the reliability of the tests, which may be easily shown to be less than 30%, but the simplicity of the procedure, the low price of the equipment, and its ease of use.
What is the range of the Schmidt hammer test?
Schmidt hammer measurements are on an arbitrary scale ranging from 10 to 100. Schmidt hammers are available from manufacturers in several different energy ranges,
including (i) Type L-0.735 Nm impact energy, (ii) Type N-2.207 Nm impact energy, and (iii) Type M-29.43 Nm impact energy.