Characteristics for vibration damping of the concrete included secondary subject

A concrete structural material with damping performance for vibration has been investigated. It is proposed that in order to reduce the sound propagation in the solid material, the concrete material disperses many small cells in which many easy moving particles are included. It is expected that the vibration energy which is applied to the material is absorbed by the impaction and friction of the particles alternatively and between particles and cell’s wall. The preliminary experiment to confirm the capability of the high damping material on the basis of this concept has been carried out. It was shown that damping performance of the specimen depended on the size, the density, and the volume fraction of the particles by the impact vibration testing for the coupon‐sized test specimen. The effect of the easy moving particles for reduction of the sound propagation in the solid was confirmed by the sound propagation testing for the middle‐sized panel specimen.