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: The Free-Free Resonant Test (FFRT) has been conducted to analyze the dynamic properties of each specimen with variation of material properties, such as particle size or joint pattern. Three types of mortar specimens have been made with different particle size, the artificial joint specimens have been made with different joint number, and the anhydrite specimens have been made with different joint thickness. From the results, it is shown that dynamic Young's modulus and dynamic shear modulus increase with particle size of sand in mortar specimen. These dynamic moduli show decreasing, however, with number of joint in artificial joint specimen. And also it is revealed that the dynamic moduli and joint thickness are inversely related.

A Study on the Dynamic Properties of Specimen with Different Particle Size and Joint Distribution Patterns