Brief

The mechanical impedance method of testing the strength of concrete offers advantages over the traditional rebound hammer method, according to a study by researchers in Japan. “This study shows consideration for basic principle of the mechanical impedance method for compressive strength estimation of concrete, and its application and measurement accuracy are discussed through a field experiment,” researchers write.

 

Insight

tion for compressive strength test of concrete structures through its long history, its measurement accuracy and application is still considered as debatable. On the other hand, the mechanical impedance method is proposed as a new method for estimation of compressive strength in these days.

Although both methods require direct impact on concrete surface in order to estimate compressive strength, basic principle is different. The rebound number, that rebound hammer measures, is depending on the degree of absorption of kinetic energy during the plastic deformation process of concrete surface generated by hammering.

On the other hand, the mechanical impedance method measures mechanical impedance between a hammer and concrete surface at the contact point. The mechanical impedance is derived from Young’s modulus, and is used for estimation of compressive strength of concrete.

This study shows consideration for basic principle of the mechanical impedance method for compressive strength estimation of concrete,and its application and measurement accuracy are discussed through a field experiment.

 

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