This study was carried out to examine on the possibility of the reuse of used tires in the concrete field, from the standpoint of recycling of industrial waste. The physical properties of the mortar and the porous mortar using the rubber-chops processed from used tires as fine aggregate were examined for practical use. As a result, the compressive strength of concrete using rubber-chops was decreased. But assuming the reuse as floor slabs, the sound transmission ability in high frequency range was lowered and found out to be applicable for the concrete slab. Moreover, it could also be applicable for sound absorption material, as the sound absorption performance of porous mortar mixed with rubber-chops was shown good enough, in the range of 300Hz or more.
