Enhancing the vibration reduction ability of concrete by using steel reinforcement and steel surface treatments

The vibration reduction ability of mortar, as expressed by the loss modulus under dynamic flexure (0.2-1.0 Hz), was increased by three (or more) order s of magnitude upon the embedment of steel rebars in the mortar, mainly due to the increase in the vibration damping capacity. By sandblasting the ste el rebars, the loss modulus was increased by up to 91%, relative to the val ues obtained by using as-received rebars, due to the increase in the dampin g capacity. Surface treatment of the steel rebars by ozone had negligible e ffect on the loss modulus. The damping capacity was comparably enhanced by steel addition and silica fume addition. (C) 2000 Elsevier Science Ltd. All rights reserved.