A test device and test method for high-pressure stability and pumping limit performance of concrete

Abstract

The invention discloses a device for testing the high pressure stability and pumping limit performance of concrete. The device comprises a test cylinder, a cone-shaped tube and a pump pipe, wherein the test cylinder is internally provided with a piston capable of sliding along the axial direction on the inner wall of the test cylinder; the outer end surface of the piston is connected with an externally arranged propeller; one end of the test cylinder is connected with the large-aperture end of the cone-shaped tube, and the small-aperture end of the cone-shaped tube is connected with one end of the pump pipe; a discharge hole is formed at the other end of the pump pipe; a stop valve is arranged at the discharge hole; a feeding hole is formed in the cone-shaped tube; a pressure sensor is arranged in the pump pipe; the axes of the test cylinder, the cone-shaped tube and the pump pipe are overlapped. The invention also discloses a method for testing the high pressure stability of the concrete and a method for testing the pumping limit performance of the concrete. After the device and the methods are adopted, the ultrahigh pumping pressure environment of the concrete can be simulated in the actual construction process, so that the high pressure stability of the pump concrete can be detected; the device and the methods are good in detection effect and high in accuracy of the testing results, thus being used for evaluating the performances of the concrete in a limit pumping state.

Description

technical field [0001] The invention relates to the field of concrete performance testing, in particular to a testing device and testing method for concrete high-pressure stability and pumping limit performance. Background technique [0002] Concrete pumping construction means that concrete is transported to the construction site through pumps and pipelines for pouring. With the increase of the pumping construction height, the pressure in the pumping pipeline is also increasing, which makes the concrete not only need to have excellent fluidity, cohesion and homogeneity, but also must have its excellent performance under high pressure environment ability to maintain. [0003] At present, the pressure bleeding method is usually used to test the pumpability of concrete in a pressure environment at home and abroad, and the three performance parameters of concrete fluidity, cohesion and homogeneity are mainly tested. However, with the popularization of polycarboxylate high-effi...

AI Technical Summary

Problems solved by technology

However, with the popularization of polycarboxylate high-efficiency superplasticizers, the water consumption of concrete mixtures has been significantly reduced, and the bleeding volume (V 10 , V 140 ) is significantly reduced, the test results obtained by the pressure bleeding method deviate greatly from the actual results, and the reference value is also reduced; at the same time, the pressure bleeding method can usually only detect static concrete properties, and the test results obtained by this method It cannot be used to measure the performance of concrete under high pressure pumping

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