Plastic concrete permeability test device and its test method

Abstract

The invention relates to a plastic concrete permeability test device, which comprises a pressure control cabinet and a plastic concrete permeameter connected with the pressure control cabinet. The test device provided by the invention is characterized in that the plastic concrete permeameter contains a pedestal; the upper portion of the pedestal is provided with a rotatable connecting ring, whichis connected with the pedestal through several external handles; the connecting ring is connected with a pressure chamber through screw thread; the pressure chamber is connected with a top cover through screw thread; the top cover is connected with the pedestal through several columns; the center of the top cover is provided with a drift cap positioned on the upper portion inside the pressure chamber; the upper portion of the drift cap is fixedly connected with the top cover through a movable top cover handle; the pedestal on the bottom inside the pressure chamber is provided with a bottom cap corresponding to the drift cap; the bottom cap is equipped with an osmotic pressure adapter and a lower draining exhaust pipe which penetrate the bottom cap and the pedestal; and the drift cap is provided with a confining pressure pipe, an upper draining exhaust pipe and a volume buret-connecting pipeline which communicate with a test piece of the pressure chamber and penetrate the movable top cover. In the meanwhile, the invention also discloses a test method for the device.

Description

technical field [0001] The invention relates to a penetration test device and a test method, in particular to a plastic concrete penetration test device and a test method. Background technique [0002] Plastic concrete is a kind of flexible anti-seepage material formed by replacing part of the cement in ordinary concrete with bentonite, clay and other admixture materials. It has the characteristics of low elastic modulus, high ultimate strain and good impermeability. In recent years, plastic concrete has been widely used in anti-seepage materials of hydraulic engineering dam foundations and diaphragm walls for embankment anti-seepage reinforcement. Impermeability is an important indicator of plastic concrete, and there is no finalized plastic concrete permeameter product yet. [0003] Chinese patent application 201010249720.3 discloses a test method for determining the permeability coefficient of plastic concrete. This method uses six test pieces to be made, and butter and ...

AI Technical Summary

Problems solved by technology

[0006] 1. The plastic concrete permeability coefficient is calculated by the average water seepage height, the physical meaning is not clear, and the seepage flow rate of the specimen under stable seepage within a certain period of time cannot be measured, so the plastic concrete permeability coefficient cannot be accurately determined

[0007] 2. Since plastic concrete is a non-homogeneous material, the water seepage height of each measuring point is different at the same time. The water seepage height of the split surface of the sample is used as the water seepage height of the whole test piece, and thus obtained The authenticity of the test results cannot be guaranteed, and the obtained data are only used for reference in the design and construction of the project

For the samples of the penetration test, the size of the above-mentioned samples is very unreasonable in terms of diameter-to-height ratio, which cannot meet the particle size requirements of the mixture of concrete and plastic concrete. The equipment has strong limitations and can only be made of finer particles and uniform Penetration test of test piece

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