超音波スペクトロスコピー法を適用したコンクリートの劣化度評価に関する研究(その2) : アルカリ骨材反応を受けたモルタルの場合

Abstract

Ultrasonic spectroscopy technique was applied to evaluating the quality of concrete damaged by the alkali aggregate reaction, as one of the non-destructive testing technique for concrete. The energy and the maximum amplitude of measured wave propagating through the mortar specimens decreased, and the energy moment and the energy dispersion increased with the progressive damage of specimen by the alkali aggregate reaction. The energy of propagated wave was more sensitively affected by the damage of the internal structure of specimen than the maximum amplitude and pulse velocity. The maximum amplitude, the average frequency and the energy of measured waveform, and further the particular energy of the frequency transfer function in the specific frequency range were closely related the change of internal structure of mortar, due to the damage by the alkali aggregate reaction. The results obtained by the present study suggested that the assessment of damage in mortar by the alkali aggregate reaction was possibly accomplished by the ultrasonic spectroscopy technique.