Device for detecting separation resistance and viscosity of pump concrete and test method

Abstract

The invention discloses a device for detecting separation resistance and viscosity of pump concrete and a test method. The device comprises a circular bar, a cylindrical drum, a base plate, an F-shaped bracket and a three-directional blade, wherein the bottom of the F-shaped bracket is fixed on the base plate; a moveable screw is arranged in a horizontal rod on the upper part and is used for fixing the circular bar; a rotating shaft is arranged in the middle of a vertical rod and can be used for rotating the horizontal rod. A method for detecting the separation resistance and viscosity of newly stirred concrete by adopting the device comprises the following steps: placing the cylindrical drum filled with concrete on the base plate, standing by for 5min, and then slightly contacting the three-directional blade with the concrete surface, releasing and naturally sinking into the concrete; adjusting the circular bar for contacting with the concrete surface; unscrewing the screw, and vertically inserting the circular bar into the concrete under the effect of gravity; recording the sinking time, the depth inserted into the concrete and the sinking depth of the three-directional blade after stopping sinking; comprehensively evaluating the separation resistance and viscosity of the pump concrete according to the sinking time T, the depth H1 inserted into the concrete and the sinking depth H2 of the three-directional blade.

Description

technical field [0001] The invention belongs to the field of civil engineering, in particular to a detection device and a test method for the segregation resistance and cohesion of pumped concrete. Background technique [0002] In the concrete mixture, the specific gravity of water is the smallest, and it tends to float to the surface. Relying on the physical and chemical adsorption of the fine powder of cementitious materials, the water is kept in the slurry. trend, relying on the viscous resistance of cement paste to prevent sinking. However, slurry-water segregation and aggregate segregation and stratification are prone to occur in actual concrete production, especially in high-fluidity pumped concrete with large slump. [0003] The fluidity of freshly mixed concrete is large, which is beneficial to the pumping construction of concrete. It can reduce the pump pressure of the pump and reduce the labor intensity of workers. Generally, the greater the fluidity of concrete, ...

AI Technical Summary

Problems solved by technology

[0004] At present, people often use the slump test to detect the fluidity, cohesion and water retention of concrete, and use the senses to judge whether the concrete is segregated and bleeding, and whether the aggregate is sinking. However, this method can not only measure the concrete slump In addition to the expansion degree, the segregation resistance and cohesion of concrete cannot be judged quantitatively, and the results are also subject to the subjective feelings of the testers.

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