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Concrete Test Hammers

Concrete Test Hammers are ideal for fast and economical nondestructive testing (NDT) assessment of in-place concrete strength consistency. These versatile concrete testing tools, also called Swiss Hammers or Rebound Hammers. Concrete rebount test hammers provide a rebound number, or R value, of hardened concrete. Rebound testing reveals areas of inconsistent quality, allows estimates of in-place compressive strength, isolates areas damaged by freezing or fire, and areas requiring more advanced NDT applications or coring.

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Concrete Test Hammer

Type N Schmidt Hammers Comparison Chart

Click the Concrete Test Hammer Comparison Table above to enlarge, print, or download. The table compares compressive strength and impact energy.

All models operate by pressing a plunger rod against a concrete surface until a spring-loaded mass is released, causing the plunger to impact on the concrete surface. On analog models, a sliding indicator shows rebound numbers. Advanced electronic versions use sensors and accelerometers for more repeatable R values. Included calibration curves provide estimated strength of concrete from rebound number. However, accuracy is greatly improved by user-produced laboratory correlations with compression tests on the same type of concrete being evaluated, as described in ASTM C805 and ACI 228.1R.

  • Schmidt Hammers are the industry standard for rebound hammers with known repeatability and longevity. They are available in Type N or Type L models. Both types come in a plastic carrying case.
  • Gilson Concrete Test Hammer is a cost-effective, Type N alternative to the Original Schmidt Concrete Rebound Test Hammer. Is supplied in a nylon carrying case.