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A test method for the medium transmission test device of concrete under the coupled action of temperature-osmotic pressure-load

A test device, osmotic pressure technology, applied in the direction of measurement device, permeability/surface area analysis, strength characteristics, etc., to achieve the effect of small device size, convenient movement and simple structure

Active Publication Date: 2022-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many devices used to study the transmission performance of concrete under the action of osmotic pressure and load alone, but there are few devices that can realize the coupling effect of osmotic pressure and load. Therefore, it is necessary to design a device that can realize the coupling effect of the two. very necessary

Method used

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  • A test method for the medium transmission test device of concrete under the coupled action of temperature-osmotic pressure-load
  • A test method for the medium transmission test device of concrete under the coupled action of temperature-osmotic pressure-load
  • A test method for the medium transmission test device of concrete under the coupled action of temperature-osmotic pressure-load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, an ultra-high-performance concrete sample with a water-binder ratio of 0.16 is used. The size is 100mm×100mm×100mm. The shape of the test block is a cube. It is taken out after steam curing for 3 days. The experimental solution in the application example is NaCl with a concentration of 10%. For the solution, the temperature of the experiment is 30°C, the osmotic pressure is 4MPa, and the stress ratio is 0.3 (ratio of required stress and concrete strength).

Embodiment 2

[0053] In this example, an ultra-high-performance concrete sample with a water-binder ratio of 0.16 is used. The size is 100mm×100mm×100mm. The shape of the test block is a cube. It is taken out after steam curing for 3 days. The experimental solution in the application example is NaCl with a concentration of 10%. For the solution, the experimental temperature is 70°C, the osmotic pressure is 4MPa, and the stress ratio is 0.3.

Embodiment 3

[0055] In this example, an ultra-high-performance concrete sample with a water-binder ratio of 0.16 is used. The size is 100mm×100mm×100mm. The shape of the test block is a cube. It is taken out after steam curing for 3 days. The experimental solution in the application example is NaCl with a concentration of 10%. For the solution, the experimental temperature is 30°C, the osmotic pressure is 2MPa, and the stress ratio is 0.3.

[0056] Figure 5 It is the change curve of water pressure with time. It can be seen that after 7 days of continuous action, the water pressure remains basically unchanged, indicating that the device has excellent airtightness. Figure 6-Figure 8 These are the chloride ion concentration distribution curves inside the concrete obtained in Examples 1 to 3 of the above-mentioned examples. It can be seen that the change trend of the chloride ion concentration is basically consistent with the results obtained in similar studies, and after changing parameters...

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Abstract

The invention discloses a medium transmission test device and method for concrete under the coupled action of temperature-osmotic pressure-load, which includes a loading device and a hydraulic pressure device. The loading device includes a press, an upper steel plate and a lower plate for clamping a test block. Steel plates, fasteners connecting the upper and lower steel plates, the upper steel plate includes a first steel plate and a second steel plate, and a spring is set on the screw between the first steel plate and the second steel plate; the hydraulic pressure device includes a liquid storage tank, a pressing A pump, a liquid storage tank, a connecting pipe connecting the pressure pump and the liquid storage tank, and a connecting pipe connecting the pressure pump and the liquid storage tank; the liquid storage tank is provided with an open end, and the tank mouth of the open end is fixedly connected with the side of the test block. The invention realizes the coupling effect of load-temperature-osmotic pressure of concrete, can better simulate the complex and harsh environment of underground concrete, and provides an effective device support for the research on the durability of concrete under complex and harsh conditions.

Description

technical field [0001] The invention relates to a concrete performance test device, in particular to a test method for a concrete medium transmission performance test device. Background technique [0002] Cement concrete is currently the most widely used building material in the field of civil engineering. Concrete is considered to be a very durable building material, but with its application in complex engineering environments, the premature failure of concrete structures due to durability problems has attracted close attention from civil engineering scholars. [0003] Concrete is often coupled by mechanical factors (static load, dynamic load) and environmental factors (chloride ion erosion, carbonation, freeze-thaw cycle, sulfate attack, temperature, etc.) during its service, resulting in premature deterioration of structural concrete and early retirement from service. In some special environments, such as underground space structures and underwater structures, concrete ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N3/04G01N15/08
CPCG01N3/12G01N3/04G01N15/082G01N15/0826G01N33/383G01N3/10G01N2203/0019G01N2203/0048
Inventor 刘志勇夏溪芝蒋金洋张云升
Owner SOUTHEAST UNIV
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