Experimental device and evaluation method for simulating washing and grinding of mortar and concrete by suspended load

Abstract

The invention discloses an experimental device and an evaluation method for simulating the impact and abrasion of mortar and concrete by a suspended load. The experimental device comprises a bracket, a test piece table and a suspended load impact and abrasion assembly, the support comprises a base, stand columns and a beam. The test piece table is used for fixing a to-be-simulated test piece; one side wall surface of the test piece is a to-be-simulated impact wear side surface; the suspended load punching and grinding assembly comprises a swing arm, a swing arm driving mechanism, a suspended load punching and grinding block and a displacement detection part; the side face, facing the test piece, of the suspended load punching and grinding block is a suspended load punching and grinding face, and a plurality of rigid wear-resisting balls with the diameter not larger than 5 mm are evenly distributed on the suspended load punching and grinding face. When the suspended load punching and grinding block swings to the lowest point, the rigid wear-resistant ball on the suspended load punching and grinding surface can be punched and ground with the to-be-simulated punching and grinding side surface of the test piece; the displacement detection part comprises a displacement sensor and a displacement meter. According to the method, the surfaces of the mortar and the concrete which are washed and abraded by the suspended load are evaluated from the angle of energy, the mechanism of washing and abrasion is disclosed, and the anti-washing and anti-abrasion design of a hydraulic concrete structure is better guided.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an experimental device and an evaluation method for simulating suspended mass scouring 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 si...

AI Technical Summary

Problems solved by technology

However, the loss of instruments and equipment used in these three test methods is more serious during the test process, and the evaluation basis is relatively simple, which is the mass loss of the test piece, which cannot be related to other physical and mechanical properties of the test piece, nor can it be obtained from The angle of energy organically combines the effect of external force with the abrasion resistance of the specimen

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