Evaluation of the Quality of Concrete Structures by the Rebound Hammer Method

The quality problems encountered in concrete structures appear at different stages of the construction of works, it is for this reason that for a long time there has been an increased demand for more precise and, at the same time, more flexible methods of concrete quality assessment. This paper presents some notions concerning the Schmidt rebound hammer test which is one of the non-destructive methods most used for the recognition of the condition of building structures. This test is quick and easy, it makes it possible to control the quality of the construction and to indirectly measure the compressive strength of concrete in situ. The rebound hammer calibration procedure was detailed on an example by presenting the different steps. The influence of several factors affecting the rebound hammer test, whether related to the properties of concrete or otherwise, was were presented. Indeed, Surface texture, concrete humidity, type of aggregates, cement type and carbonation of the concrete surface are parameters which strongly influence the results of Schmidt rebound hammer test.

Keywords: Concrete; Schmidt rebound hammer; Non-destructive; Compressive strength