Assessing the compressive strength of concrete in finished structures (in situ strength) is important to ensure concrete has cured correctly, is safe, durable, and meets regulations. Coring involves cutting cylinders of concrete from various locations of a structure that are later tested with a compression strength machine.
Coring provides precise measurements, but cannot be used alone for a complete assessment. The process can create weak points or damage to a structure and is more expensive. Rebound hammers, or Schmidt hammers, are the most common non-destructive, concrete strength testing instruments. Rebound hammer surveys help identify the best locations for coring, reducing the amount of cores required. When combined, coring and rebound testing lower costs and increase efficiency.
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