Development of a laser-driven ultrasonic technology for characterizations of heated and aged concrete samples. Issue 5 (4th May 2022)

• Record Type: Journal Article
• Authors: Yamada, Tomonori; Daido, Hiroyuki; Shibata, Takuya
• Is Part Of: Journal of nuclear science and technology. Volume 59:Issue 5(2022)
• Page Start: 614
• Page End: 628
• Publication Date: 2022-05-04
• Subjects: Laser -- ultrasonic -- concrete -- diagnostics -- fuel debris retrieval -- Fukushima Daiichi; Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2021.1996295
• Languages: English
• ISSNs: 0022-3131

Abstract

ABSTRACT: 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°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.