Device and method for testing resistance characteristics of fresh concrete and boundary

Abstract

The invention discloses a fresh concrete and boundary resistance characteristic test device and test method.The test device comprises a counter-force frame, a driving mechanism, an outer cylinder, a rotor and a pressurizing mechanism, the driving mechanism is installed at the bottom of the inner side of the counter-force frame, an output shaft of the driving mechanism is connected with the rotor, the rotor is placed in the outer cylinder, and the pressurizing mechanism is connected with the outer cylinder; a concrete sample is filled between the rotor and the outer cylinder, a plurality of pressurizing mechanisms are symmetrically arranged at the top of the concrete sample, the tail ends of the pressurizing mechanisms are mounted on the counter-force frame, and the pressurizing mechanisms, the rotor and the driving mechanism are all connected with a data receiver. According to the invention, adjustment of conditions of different compression states and different shear slip rates can be realized at the same time, different actual working states of concrete in a construction process can be accurately simulated, and fresh concrete and boundary resistance in different states can be measured; the rule of boundary resistance characteristics under the conditions of different concrete, different pressures and different shear slip rates can be researched.

Description

technical field [0001] The invention relates to a test device and a test method, in particular to a test device and a test method for fresh concrete and boundary resistance characteristics. Background technique [0002] Concrete has been widely used since its invention. In recent years, with the complexity of construction engineering structures, higher requirements have been placed on the performance of fresh concrete, including the fluidity, filling and pumpability of concrete. At the construction site, the resistance of the boundary to the concrete (such as the constraints of the pump pipe and the formwork) has a great influence on the pumping pressure of the concrete during the pumping process and the filling performance during the pouring process. The resistance properties between the concrete and the boundary are of great importance. [0003] For a long time, empirical methods have been used to predict the pumping pressure. However, with the emergence of new types of c...

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Problems solved by technology

[0003] For a long time, empirical methods have been used to predict the pumping pressure. However, with the emergence of new types of concrete, the rheological properties of concrete have changed greatly. Past experience is difficult to fully apply, and there is often a gap between the predicted pumping pressure and the actual situation. big deviation

In addition, the influence of the resist

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