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Schmidt Hammers

The rebound hammer is an increasingly popular strength assessment apparatus due to its simple operation and portability. Most versions are divided into two types based on the impact energy they produce. Both are effective on concrete mixes with a similar range of compressive strengths.

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Schmidt Hammers

Click to enlarge or download Schmidt Hammers Comparison Table to compare compressive strength and impact energy between Schmidt Test Hammers.

Type N Schmidt Hammers Comparison Chart

When performed on precast specimens or existing structures, the impact hammer test has become an integral part of a comprehensive strength assessment strategy. This non-destructive testing method provides a quick, reliable means of correlating rebound measurements with concrete strength.

Rock Schmidt Hammers are designed with specific geological and geotechnical capabilities. These hammers are frequently used to assess the workability, boreability, and excavatability of rocks, as well as estimating the uniaxial compressive strength of discontinuity walls.

  • Schmidt Type N Test Hammers are often considered as the “standard” models and have a higher energy output to test a wide range of concrete elements and structures 4in (100mm) or more in thickness.
  • Schmidt Type L Test Hammers have lower impact energy and provide more repeatable values when testing items less than 4in (100mm) in thickness. Ideal for thinner sections like precast pipe or early-age concrete for form removal or post-tensioning operations, Type L concrete hammers also reduce both cosmetic and structural damage to concrete with thin cross sections.