DETERMINATION OF CONCRETE DYNAMIC ELASTIC-CONSTANTS USING A MINIATURESEISMIC-REFLECTION SYSTEM

This paper presents the application of a miniature seismic reflection (MSR) system for the determination of the material quality of concrete samples in the laboratory. This system is a complement to the already existing impact echo nondestructive testing technique. Its function i s based on the impact echo principle with the additional capability of capturing shear wave vibrations as well as longitudinal vibrations. A supplemental tangential displacement transducer to the impact echo sy stem enables the user to evaluate the dynamic elastic properties of co ncrete. The authors provide a detailed description of the system along with the results of the experiments carried out on four different typ es of concrete mixes by monitoring their curing for a period of 28 day s.