Device and method for evaluating thixotropic property of fresh concrete

Abstract

The invention discloses a fresh concrete thixotropic property evaluation device which comprises a collection hopper fixed on a fixed support, the collection hopper is connected with a diaphragm pump through a first stainless steel braided tube, the diaphragm pump is further connected with a horizontal conveying steel tube through a second stainless steel braided tube, and a pressure sensor is arranged in the horizontal conveying steel tube. The horizontal conveying steel pipe is connected with a discharging nozzle through a stainless steel bent pipe, a flowmeter is arranged on the discharging nozzle, a stainless steel frame is arranged below the discharging nozzle, and the stainless steel frame is placed on a glass plate. The invention also provides a method for evaluating the thixotropic property of the fresh concrete. By simulating the pumping and construction process of the fresh concrete, the pumpability of the fresh concrete can be evaluated, the thixotropic performance of the fresh concrete can be reflected in real time, and the evaluation method and device have the advantages of being easy and convenient to operate, efficient, good in detection real-time performance, wide in application range and the like.

Description

technical field [0001] The invention relates to a concrete performance evaluation device and method, in particular to a fresh concrete thixotropic performance evaluation device and method, belonging to the field of building concrete construction performance testing. Background technique [0002] Fresh concrete refers to the concrete that still has a certain degree of fluidity and plasticity during the period from the beginning of mixing various cementitious materials to the completion of the on-site grouting stage. As a typical building material with high thixotropy, the working performance of fresh concrete will gradually change with the passage of mixing time, which has great influence on the pumpability of concrete itself and the performance of cementitious materials after hardening. Significant influence. Thixotropic performance, as the most important characteristic of the flow behavior in the process of concrete pumping, can directly reflect the working performance of ...

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Problems solved by technology

However, this method has certain limitations and cannot characterize the cohesion of fresh concrete

Another example is that the Chinese utility model whose publication number is CN211453625U discloses a concrete thixotropic performance test device. By setting different stirring rates, the time required for extruding the same quality cement under the same pressure is tested, and the cement is used under different rotating speed conditions. The viscosity of the cement is used to characterize the thixotropic index of the cement, but this evaluation method has the problem that the plasticity of the concrete after extrusion cannot be considered

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