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※ 半角英数字
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Development of a laser-driven ultrasonic technology for characterizations of heated and aged concrete samples

加熱劣化したコンクリートの特性評価を目的としたレーザー超音波診断技術の開発

山田 知典; 大道 博行*; 柴田 卓弥 

Yamada, Tomonori; Daido, Hiroyuki*; Shibata, Takuya

We have demonstrated a full noncontact laser technology to measure the velocity of ultrasonic waves and their spectra propagated through concrete samples exposed to specified high-temperature conditions with specified durations as models of concrete structures in a severe accident at the Fukushima Daiichi Nuclear Power Station. The velocities and spectra of the ultrasonic waves were strongly dependent on the exposed temperature, i.e., at a high-temperature condition of 400$$^{circ}$$C, the velocity was 3700 m/s, and at room temperature, the velocity was 5000 m/s. Experimental results are almost comparable to those obtained by the contact ultrasonic technique.

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