System and method for testing performance of underwater non-dispersible slurry in water conservancy and hydropower engineering

A technology of water conservancy, hydropower and testing system, which is applied in the direction of applying stable tension/pressure to test the strength of materials, preparation of test samples, and analysis of materials, etc. Problems such as the effect of construction application and the inability to adjust according to actual needs, etc., to achieve a scientific and reasonable effect of the test plan

Pending Publication Date: 2021-01-08
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) The water inlet point of the grouting material is fixed and cannot be adjusted; in the forming of the underwater test piece, underwater dispersion resistance and other tests, the specifications all stipulate that the mixture falls from the water surface to the water, and the height of the water in the water tank is 150mm above the upper limit of the mold, that is to say, the water drop position of grouting feeding is fixed and cannot be adjusted according to actual needs
[0007] (4) The test of the performance of the slurry mixture was not operated underwater; for the large flow state of the underwater non-dispersible slurry, the expansion degree of the mixture and the setting time are important technical indicators, which are directly related to the on-site construction performance and the underwater performance. Plugging efficiency
This is also quite different from the actual construction environment, and the method in the specification does not fully reflect the difference in the impact of the underwater environment
[0008] Based on the above analysis, the underwater non-dispersible slurry needs to be adapted to different underwater operating environments. In many cases, the actual working conditions are dynamic water operations, and the water flow mode is relatively complicated.
Factors such as wading temperature, water depth, water flow state, and water flow direction will affect the performance of underwater non-dispersible grout, thereby affecting the application effect of underwater seepage sealing and caulking construction
The current standard test method does not fully reflect the construction environment on site, and there are no relevant specific regulations at present

Method used

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  • System and method for testing performance of underwater non-dispersible slurry in water conservancy and hydropower engineering
  • System and method for testing performance of underwater non-dispersible slurry in water conservancy and hydropower engineering
  • System and method for testing performance of underwater non-dispersible slurry in water conservancy and hydropower engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Aiming at an underwater project that requires the use of underwater non-dispersible clean slurry for on-site seepage plugging, after analysis and research, the project’s design indicators and requirements for the plugging slurry: the suspension of the water body after adding the underwater non-dispersible slurry The turbidity content is ≤50mg / L, the pH value is ≤8.5, the underwater expansion is controlled at 180mm±10mm, and the final setting is within 5 hours. The project is located about 3m underwater, the water temperature is about 15°C, and the water velocity is small, so it can be regarded as a still water state. In view of the above performance requirements, the cement slurry is basically selected to seal the leakage of the project, but how to determine that the performance of the cement slurry meets the above performance requirements, the existing methods cannot be simulated for the project site, so the project engineers The above-mentioned test device i...

Embodiment 2

[0058] Example 2 For an underwater project that needs to be repaired with underwater non-dispersible mortar, the repaired part is 5m underwater, there is a certain water flow, and the underwater temperature is about 25°C; there are two kinds of sand-containing cement-based materials to choose from. The properties of the two materials are compared and optimized. The materials are required to remain undispersed underwater, self-flowing (the degree of expansion is required to be controlled within the range of 180mm±10mm), and have a certain strength (28d underwater compressive strength is greater than 20MPa), and 7d, 28d The land-water intensity ratio is not less than 70%.

[0059] For this reason, by simulating the field conditions, the related performance tests of two materials (A1, A2) underwater non-dispersible mortar were compared to evaluate the material performance.

[0060] (1) Fill the water tank with water so that the water surface remains flush with the overflow hole 8...

Embodiment 3

[0072] Example 3 is an embankment project. There is a leak at 6m underwater in the embankment project, causing the downstream surface to flow soil. It needs to be repaired with underwater non-dispersible concrete. The repaired part has a relatively large water velocity and the underwater temperature is about 10°C. The underwater non-dispersible concrete is required to be non-dispersible underwater, the content of underwater suspended matter ≤ 100mg / L, the pH value ≤ 9.0, the degree of underwater expansion should be controlled at 490mm±10mm, and the defect can be blocked within 4 hours (the final time within 240min) condensation).

[0073] For this reason, three kinds of concrete flocculants (B1, B2, B3) were selected for comparison, and by simulating the field conditions, the relevant performance tests of underwater non-dispersible concrete were carried out for engineering reference.

[0074] (1) Fill the water tank with water so that the water surface is flush with the overfl...

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Abstract

The invention provides a system and a method for testing the performance of underwater non-dispersible slurry in water conservancy and hydropower engineering. The testing system comprises an upper opening type transparent water tank, a grouting funnel, a test beaker and a test mold, an overflow hole is formed in the upper portion of the transparent water tank, a stirrer and a heating element are arranged in the transparent water tank, and the grouting funnel is erected above the middle of the transparent water tank through a funnel support. The system can control the water temperature, the water flow state and the feeding and water inlet positions, and can simulate the field environment to test the underwater expansion degree, the underwater coagulation time and the underwater compressivestrength of underwater non-dispersed slurry and the suspended matter content and the pH value of a water body. According to the method, different test environments are customized in a personalized mode, the field working condition is simulated, the test scheme is scientific and reasonable, the dispersion resistance, the mixture performance and the mechanical performance of the underwater non-dispersible slurry are compared and analyzed through multiple quantitative indexes, and technical support is provided for scheme comparison and selection, true performance evaluation and the like of the underwater non-dispersible slurry.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, and specifically relates to an underwater non-dispersible slurry performance testing device and method used in water conservancy and hydropower projects with adjustable water flow state, water temperature and water entry height, aiming at testing underwater non-dispersible clean slurry and mortar The underwater anti-dispersion ability of concrete or concrete under different working conditions provides a basis for material selection and performance evaluation of underwater leakage plugging or defect repair of hydraulic structures. Background technique [0002] At present, for the underwater repair of leakage defects of hydraulic structures, some leakage sealing and caulking materials suitable for underwater operations have been developed. Non-dispersibility, so it is collectively called underwater non-dispersible slurry. Among them, cement-based underwater non-dispersible grout, inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38G01N11/00G01N1/38G01N1/36G01N3/08
CPCG01N33/383G01N33/38G01N11/00G01N1/38G01N1/36G01N3/08G01N2001/366G01N2203/0019
Inventor 石妍李家正林育强刘恒张达曹亚李杨高志扬周世华张建峰李明霞张亮
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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