超音波スペクトロスコピーによるコンクリートの劣化度評価に関する基礎的研究 : 高温加熱を受けたコンクリートの場合

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In recent years, it became possible to detect feeble electrc signals supersinsitively owing to the development of electric measuring techniques. Now, an advanced tehnique using ultrasonic pulses is being applied in the cocrete field too. The waveform of ultrasonic pulses through concrete contains variou informations related to the internal structure of material. So, itmay be possible to clarify the internal structure of material by analyzing the measured waves in detail. Tus, ultrasonic spectroscopyis useful to evaluate the quality of material by measuring the frequency characteristics of ultrasonic pulse through material. In this study the ultrasonic spectroscopy was applied to evaluate the quality of concrete exposed to high temperature conditions, as the first step to establish a ew non-destructive testing technique for concrete and mortar. The main results obtained in this study are summarized as follows: 1) compressive and flexural strengths of concrete decreased according to temperature rise. Especially the flexural strength of mortar was sensitively affected by temperature rise. 2) The ultrasonic pulse velocity, maximum amplitude and energy of measured ultrasonic pulse waves decreased according to temperature rise. 3) The maximum amplitude and energy of frequency transfer function of concrete decreased with increasing temperature, and these decreasing rates were not affected very much by the water-cement ratio and heating duration. 4) The local maximum amplitude and energy of the frequency transfer function in the frequency ranges of 50-100 kHz and 200-250 kHz were closely related to the change of internal structure of concrete exposed to high temperature.
社団法人日本材料学会の論文
1989-08-15

超音波スペクトロスコピーによるコンクリートの劣化度評価に関する基礎的研究 : 高温加熱を受けたコンクリートの場合

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