Experimental study on the characteristics of concrete erosion by low-sand content and low-velocity water flow

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (4) : 238-243.

SHOCK AND EXPLOSION

Experimental study on the characteristics of concrete erosion by low-sand content and low-velocity water flow

GU Lei1,2， DAI Fuxu*1,2， LI Hongbin1,2， WANG Shun1,2， LIU Yong1,2

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Abstract

Erosion by low-velocity and low-sand content water flow is a common and highly neglected problem faced by hydraulic concrete structures in long service. In order to study the key influencing factors and laws of its abrasion, a low-velocity and low-sand content jet scouring experimental setup was designed to carry out four groups of concrete specimens with six different ratios for a total of 23 long-time abrasion tests, and based on the accurate measurement of the specimen mass abrasion amount, the effects of the characteristic parameters of the jet and the key admixture of concrete on the abrasion of concrete were analyzed. The results show that : the erosion of concrete by low-sand content and low-velocity water flow can be divided into two types of actions: normal erosion and tangential grinding; the abrasion effect of normal erosion is higher than that of tangential grinding when the speed and area are the same; as the scouring time progresses, the hourly abrasion of concrete gradually decreases and then stabilizes; within the experimental conditions of this study, the hourly abrasion increases with the rise in jet scouring speed and sand content, and is higher at larger scouring angles; appropriate increase in silica fume content and fiber content helps to improve the erosion resistance of concrete. Finally, a prediction model for sandy water flow erosion of optimally proportioned concrete is established to provide a basis for the service life assessment and performance improvement of concrete.

Key words

concrete / hourly abrasion / low-sand content jet / low-velocity erosion / experiment

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GU Lei1, 2, DAI Fuxu1, 2, LI Hongbin1, 2, WANG Shun1, 2, LIU Yong1, 2. Experimental study on the characteristics of concrete erosion by low-sand content and low-velocity water flow[J]. Journal of Vibration and Shock, 2025, 44(4): 238-243

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