Experimental simulation device and evaluation method for washing and grinding mortar and concrete by bed load

Abstract

The invention discloses a test simulation device and method for scouring and grinding mortar and concrete through bed load. The test simulation device comprises a test piece table, a test piece support, a bed load scouring and grinding mechanism, a displacement sensor, a speed sensor and a test piece height control mechanism. The top surface of the test piece is exposed to form a test piece simulation punching and grinding surface; the bed load punching and grinding mechanism comprises a cantilever, a cantilever driving mechanism, an impact hammer and a punching and grinding roller; the punching and grinding roller is arranged in the center of the bottom of the impact hammer, the two ends of a center shaft of the punching and grinding roller are hinged to the bottom of the impact hammer, and the diameter of the punching and grinding roller is not smaller than 5 mm; the displacement sensor can be used for detecting the height of the impact hammer; the speed sensor can be used for detecting the speed of the impact hammer; the test piece height control mechanism comprises a test piece top surface height sensor and a test piece height lifting mechanism. From the perspective of energy, the impact and abrasion of cement mortar and concrete by the bed load are simulated, the mechanism of impact and abrasion is disclosed, and the impact and abrasion resistance design of the hydraulic concrete structure is better guided.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a test simulation device and an evaluation method for bedding mortar and concrete. Background technique [0002] Hydraulic structures, such as dams, ship locks, flood discharge structures, power plant buildings, etc., are in contact with environmental water for a long time, and the flow surface is eroded and worn by suspended mass, bedding and high-speed water flow, and has a high resistance to concrete. Grinding requirements. In addition, the pier structure concrete of bridges across the river and sea also faces erosion and wear. There are two main types of abrasive media in water flow, namely bedding and suspended matter. Stones and sediments with a particle size larger than 5 mm that move in the manner of sliding, rolling, jumping or layering near the surface of the river bed are bedding. Suspended in the water flow, the sediment with a particle size of less than or equal ...

AI Technical Summary

Problems solved by technology

[0004] 1. The problem of equipment loss is more serious

[0005] 2. The evaluation basis is relatively single, failing to link mass loss with other physical and mechanical properties of the test piece, and failing to organically combine the effect of external force with the abrasion resistance of the test piece from the perspective of energy

[0006] 3. The underwater steel ball method only simulates the wear caused by the rolling friction on the surface of the concrete specimen without external force (the weight of the steel ball is ignored), and does not consider the impact and grinding effect of the moving mass on the concrete surface; It does not consider the surface characteristics of the moving mass, such as surface irregularities, edges and corners, etc.; it also does not consider the wear and tear caused by the moving mass on the concrete members under the action of compressive stress in the actual working conditions

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