コンクリートのアコースティック・エミッション特性と破壊挙動に関する基礎的研究

概要

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The acoustic emission (AE) method was applied to trace the change of internal structure of concrete under various loads. Five series of experiments were carried out to obtaine the fundamental information on the AE behavior of plain concrete under monotonically increasing and repeated compressive loadings. Main results obtained by the pressent study are summarized as follows : 1) Accumulated AE counts at the maximum load increase with increasing compressive strength of concrete and the specimens cured in air are emittive than the specimens cured in water. 2) The characteristic points on accumulated AE events curve of concrete approximately correspond to the characteristic stresses of proportional limit and critical stress. 3) The Kaiser effect is valid in concrete when the load is applied immediately after unloading. 4) The degree of accumulative damage of concrete under cyclic loading can be predicted more exactly by applying AE technique than by examing permanent strain increments. 5) The fracture process of concrete may be accurately traced by the location search of local fracture and the detailed examination of onset directions of AE waves. 6) The number of high frequency components gradually increases with the increase in stress level and that of low frequency components also increases at the maximum stress, independently of the loading pattern.
1985-12-30