コンクリート中における弾性波の伝播特性に関する基礎研究

概要

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Characteristics of elastic waves which propagates through concrete, imply many information about internal condition of concrete. The authors tried to evaluate the degree of cracks by analyzing the characteristics of elastic waves, which propagate through concrete. Three types of specimens, that is, plain concrete, with a reinforcing steel, and with both reinforcement and cracks, were used in the experiments. Elastic wave was introduced to the specimen by ultrasonic generator or by dropping a steel ball on the surface of specimen. Recorded waves were analyzedin terms of velocity, damping and spectrum. Though no significant effect of cracks was found out on the velocity and spectrum, much larger damping was clearly observed in the specimen witha crack, especially with a crack developed through the whole depth of section.
山梨大学の論文