Acoustic emission characteristics and damage evolution of steel fiber recycled coarse aggregate concrete under compression

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 136-142.

CUI Zhenglong, FEI Haichao, SUN Wanji, LI Zhengyuan

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Abstract

In order to explore the influence of steel fiber content ( volume rate 0 %, 0.8 %, 1.5 % ) on the basic mechanical properties of C30 recycled coarse aggregate concrete ( mass fraction replacement rate 0 %, 100 % ), the damage evolution law of steel fiber recycled coarse aggregate concrete during axial compression was described by combining acoustic emission characteristic parameters and stress-strain curve. The test results show that through the analysis of acoustic emission damage location, impact count and energy count, the dynamic monitoring of the whole process of axial compression failure of steel fiber recycled coarse aggregate concrete from cumulative damage to micro-crack evolution and then to macro-crack propagation can be realized. The concentrated location of damage points in the loading process of recycled coarse aggregate concrete and ordinary concrete specimens with different steel fiber contents is consistent with the final failure location of the specimens. The concrete damage model based on acoustic emission cumulative impact count can be used to analyze the damage evolution law of steel fiber recycled coarse aggregate concrete.

Key words

steel fiber / recycled coarse aggregate concrete / acoustic emission / axial compression / damage evolution

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CUI Zhenglong, FEI Haichao, SUN Wanji, LI Zhengyuan. Acoustic emission characteristics and damage evolution of steel fiber recycled coarse aggregate concrete under compression[J]. Journal of Vibration and Shock, 2023, 42(5): 136-142

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