Summary of Estimating Concrete Strength Using the Rebound Hammer | Non-Destructive Testing

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The rebound hammer testing method is an easy and affordable way to assess the hardness and estimate the in-place strength of concrete through non-destructive testing evaluation. The rebound number is correlated with the surface hardness of concrete, but theoretical correlation between rebound values and strength values does not exist. Guidelines from ACI 228.1R and EN 13791 must be followed to evaluate compressive strength of concrete. The recent advancements in sensor technology and wireless communication have led to the development of a new generation of rebound hammers that provide real-time checks on the quality of datasets and do not need to be adjusted for the configuration of the hammer.

• 00:00:00 In this section, the rebound hammer testing method for non-destructive testing evaluation of concrete hardness is explained. Rebound hammer is easy to use, inexpensive and assesses in-place uniformity of concrete and estimates the in-place strength of concrete. The rebound number correlates with the surface hardness of concrete and is affected by factors such as the smoothness of the test surface, shape and rigidness of the specimens, and type of coarse aggregate, cement and mold. Although it provides a quick and inexpensive means of checking the uniformity of concrete, theoretical correlation between rebound values and strength values does not exist. Certain guidelines provided by ACI 228.1R and EN 13791 must be followed to evaluate compressive strength of concrete. Recent advancements in sensor technology and development of wireless communication have led to the development of a new generation of rebound hammers that provide real-time checks on the quality of datasets, and do not need to be adjusted for the configuration of the hammer.