Dynamic characteristics and crushing features of high-strength concrete under impact load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 320-326.

HAN Changjun, ZHOU Hailong, WANG Hailong

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Abstract

In order to explore the influence of the replacement rate of fly ash and the type of fine aggregate on the impact compression performance of high-strength concrete, C80 high-strength concrete was prepared with the proportion of fly ash replacing cement as 0, 10%, 15%, 20% and 25% as cementitious materials, basalt manufactured sand and natural sand as fine aggregate, and the split Hopkinson pressure bar was used to carry out impact compression tests on it, and calculate the Fractal dimension of the broken body to quantify the crushing characteristics of concrete, And analyze the microstructure of concrete using scanning electron microscopy (SEM). The results show that the peak stress and toughness of manufactured sand concrete (MSC) are higher than those of natural sand concrete (NSC); As the replacement rate of fly ash increases, the peak strain of concrete gradually decreases; When the replacement rate of fly ash is 10%, the peak stress and toughness of concrete reach the highest value, and the Fractal dimension of the broken body is the smallest, the average block diameter is the largest, and the comprehensive broken characteristics are the simplest; Compared with the concrete without fly ash, when the fly ash substitution rate is 10%, the microstructure of the concrete is dense, the number of pores is reduced, and the overall compactness is improved.

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fly ash / Basalt manufactured sand / high-strength concrete / split Hopkinson pressure bar / impact compression；fractal dimension

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HAN Changjun, ZHOU Hailong, WANG Hailong. Dynamic characteristics and crushing features of high-strength concrete under impact load[J]. Journal of Vibration and Shock, 2024, 43(11): 320-326

References

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