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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, Schmidt hammers or rebound 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

View or download Concrete Test Hammer Comparison Table to compare compressive strength and impact energy.

Type N Schmidt Hammers Comparison Chart

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. Relative strength curves are often provided with these units to estimate strength from the rebound number, but accuracy is greatly improved with the preferred method of user-produced laboratory correlations with compression test specimens of the same mix design, as described in ASTM C805 and ACI 228.1R.