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Device and method for monitoring pore evolution before initial setting of hydraulic concrete in high-cold region

A hydraulic concrete and monitoring device technology, applied in the direction of measuring devices, suspension and porous material analysis, instruments, etc., can solve the problem of not being able to obtain the pore evolution before the initial setting of concrete, and achieve high accuracy of observation records, convenient operation, and structural simple effect

Active Publication Date: 2022-06-03
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a monitoring device for the pore evolution before the initial setting of the hydraulic concrete in the alpine region, so as to solve the problem that the existing devices cannot obtain the pore evolution of the concrete before the initial setting

Method used

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  • Device and method for monitoring pore evolution before initial setting of hydraulic concrete in high-cold region
  • Device and method for monitoring pore evolution before initial setting of hydraulic concrete in high-cold region
  • Device and method for monitoring pore evolution before initial setting of hydraulic concrete in high-cold region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] What is selected in this embodiment is the mixing ratio of hydraulic concrete in the following table (unit: kg / m 3 ).

[0059] water cement sand stone water reducer Air entraining agent 135 268 854 1070 2.51 0.02

[0060] Put the experimental raw materials into the transparent Yuantong 6 in advance, and the ambient temperature is set according to the actual test data: the set air pressure value is 101kpa, the temperature is 20°C, and the humidity is 95%.

[0061] Other processes are carried out as described above.

Embodiment 2

[0063] The difference from Example 1 is that the ambient temperature is set according to the actual test data: the air pressure is set to be 70kpa, the temperature to be 5°C, and the humidity to be 70%.

Embodiment 3

[0065] The difference from Example 1 is that the ambient temperature is set according to the actual test data: the air pressure is set to be 50kpa, the temperature to be 0°C, and the humidity to be 50%. Other processes and operations remain the same as in Example 1.

[0066] In the above three embodiments, the pore distribution evolution data in different time periods are counted respectively. Since the high-speed camera can only distinguish the distribution area of ​​macropores, the percentage of the photographed area occupied by macropores is as follows:

[0067] Example Pore ​​Type 1h 4h 12h 16h 24h 1 big hole 2.50％ 2.30％ 1.90％ 1.70％ 1.20％ 2 big hole 2.10％ 1.80％ 1.40％ 1.20％ 1.10％ 3 big hole 1.40％ 1.20％ 0.90％ 0.70％ 0.60％

[0068] According to the data analysis, due to the addition of air-entraining agent in the hydraulic concrete, under the environment of low air pressure, low temperature and low humidity, the splash reac...

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Abstract

The invention discloses a device and a method for monitoring pore evolution before initial setting of hydraulic concrete in a high-cold region, and the device comprises an environmental box, a concrete vibration table is arranged at the bottom of the environmental box, a concrete stirring device is arranged on the concrete vibration table, an air compressor, a humidifier and liquid nitrogen are arranged outside the environmental box, and the air compressor is communicated with the environmental box through a pipeline A; the humidifier is communicated with the environment box through a pipeline B, the liquid nitrogen inlet and outlet are communicated through a liquid nitrogen circulating pipeline, the liquid nitrogen circulating pipeline is arranged in the environment box, a plurality of high-speed cameras are arranged on the periphery of the environment box, and a temperature, air pressure and humidity meter is arranged in the environment box. The problem that an existing device cannot obtain pore evolution before initial setting of concrete is solved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic concrete pore structure monitoring equipment, relates to a device for monitoring pore evolution before initial setting of hydraulic concrete in alpine regions, and also relates to a method for monitoring pore evolution before initial setting of hydraulic concrete in alpine regions. Background technique [0002] With the continuous development of modern engineering technology, the requirements for concrete are also constantly strengthened, and pores exist widely in various components of concrete, and are directly related to many properties of concrete. Therefore, the detection and research on the evolution of concrete pores have very important role. The porosity of concrete is directly related to the strength, elastic modulus, dry shrinkage, impermeability, frost resistance and many other properties of concrete. Among them, repeated freeze-thaw cycles will also affect the durability of the concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01D21/02
CPCG01N15/088G01D21/02
Inventor 李阳樊鹏王瑞骏李炎隆张浩
Owner XIAN UNIV OF TECH