Nondestructive testing methods (NDT), including impact-echo techniques, were used to evaluate the quality and integrity of grout in concrete masonry unit (CMU) walls where concerns arose during construction. The testing identified areas of debonding and voids, which were successfully repaired using low-viscosity epoxy injection, restoring the structural integrity of the walls.

The Schmidt hammer, also known as the rebound hammer, is a trusted tool for non-destructive testing of concrete and rock strength. Used in construction, engineering, and geology, it provides quick, reliable surface hardness measurements to estimate compressive strength. This guide explores how it works, its advantages, and its role in ensuring structural integrity and quality control.