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A device and method for simulating natural corrosion of reinforced concrete

A technology of reinforced concrete and concrete layer, applied in the field of reinforced concrete, can solve the problems of long time, limited sampling samples, low scientific research efficiency, etc., and achieve the effect of accurate simulation effect

Active Publication Date: 2018-06-12
西安建筑科大工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

①The long-term natural exposure method is to expose the reinforced concrete specimens to the natural environment, such as the atmosphere and ocean environment. This test method takes a long time and the scientific research efficiency is low
Due to the fact that there are few actual projects that can be dismantled or replaced, and the sampling samples are limited, there are certain limitations in carrying out scientific research experiments

Method used

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  • A device and method for simulating natural corrosion of reinforced concrete
  • A device and method for simulating natural corrosion of reinforced concrete
  • A device and method for simulating natural corrosion of reinforced concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0042] combine figure 1 and 2 The device for simulating the natural corrosion of reinforced concrete in this embodiment includes a controller 1, a solenoid valve 2, a liquid storage tank 3, a liquid outlet pipe 4, a nozzle 5, an experimental tank 6, a humidity sensor 7, a test piece to be corroded 8, and an electrode 9 , DC stabilized power supply 10 and data recorder 11, wherein:

[0043] The model of controller 1 is DHT11, the model of solenoid valve 2 is 2W-500-50, and the model of humidity sensor 7 is HTF3223.

[0044] The controller 1 is respectively connected to the humidity sensor 7 and the solenoid valve 2, the liquid storage tank 3 is connected to the liquid outlet pipe 4, and the end of the liquid outlet pipe 4 is connected to the nozzle 5, and the test tank 6 is placed under the nozzle 5, and the nozzle 5 stores the liquid The liquid in the tank 3 is sprayed into the test tank 6, the electromagnetic valve 2 is arranged on the liquid outlet pipe 4 to control its sw...

Embodiment 2

[0047] Such as image 3 and Figure 4 As shown, first make the specimen 8 to be corroded: the specimen is designed as a beam with suitable reinforcement, and the positioning of the steel bars in the process of concrete pouring can be realized by using wooden formwork. The length is 2700mm; the second longitudinal reinforcement 802 uses two HRB400 grade φ20mm steel bars, the first longitudinal reinforcement 801 is two HRB400 grade φ14mm steel bars, the two first longitudinal reinforcements 801 and the two second longitudinal reinforcements 802 form a section of A rectangular frame structure, the frame structure is bound and fixed through the first stirrup area A, the second stirrup area B and the third stirrup area C arranged in sequence along the length direction, and the first stirrup area A is provided with parallel stirrups, The distance between the adjacent stirrups in the first stirrup area A is 100mm, the second stirrup area B is provided with parallel stirrups, the dis...

Embodiment 3

[0050] The test piece in embodiment two is placed in the device among embodiment one and carries out corrosion test, and process is as follows:

[0051] The moisturizing material used in this embodiment is Weihe fine sand with a particle size of 0.1 to 0.25mm and a mud content (mass fraction)≤5.0%. After the river sand is cleaned, it is completely dried in the air, and the treated river sand is sprayed with a mass percentage concentration of 3.5% to 5% NaCl solution to keep the river sand humidity at 40% to 45%;

[0052] The current intensity of the electrode 9 of the present embodiment is 40μA / cm 2 ;

[0053] Such as figure 2 As shown, the test tank 6 is built with brick masonry. The length of the test tank 6 is 4m, the width is 3.2m, and the height is 40cm. Inside, make the side (bottom surface) of the tensile longitudinal reinforcement of the test piece 8 to be corroded upward, so as to facilitate the observation of the corrosion state of the steel bar, and place a conc...

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Abstract

The invention discloses an apparatus and method for simulating natural corrosion of reinforced concrete and especially relates to an automatic control device for simulating natural corrosion of reinforcing steel bars in the reinforced concrete and a method for testing durability of the reinforced concrete. The automatic control device for simulating natural corrosion of reinforcing steel bars in the reinforced concrete comprises a power supply, a controller, a solenoid valve, a sensor, a main water pipe, a spraying sprinkler, an electrode, an electrolyte storage tank, a testing tank, a direct-current voltage stabilizer and a reinforced concrete sample. According to the invention, through adjusting the concentration of a NaCl solution, humidity of wet salty sand and current intensity, the effect of a natural corrosion environment can be simulated under laboratory conditions; data is acquired by using test time history, monitoring is controlled in real time, and a deteriorated reinforced concrete test piece in a corrosion environment is obtained; and the corrosion test piece can be used for research on endurance properties like corrosion morphology of the reinforcing steel bars and corrosion depth of corrosives and mechanical properties of the test piece after performance degradation of the reinforced concrete.

Description

technical field [0001] The invention belongs to the technical field of reinforced concrete, in particular to a device and method for simulating natural corrosion of reinforced concrete. Background technique [0002] Large-scale concrete engineering is an important infrastructure and lifeline project of the country's social economy. Its safe and normal operation plays an important role in the sustainable development of society. If the structure fails due to insufficient durability design, it will inevitably lead to huge losses of property and economy. [0003] Most of the major reinforced concrete structures are in the open air environment, under the action of wind, rain and corrosive media (such as chloride ions, acid rain, carbon dioxide, etc.), the damage to the concrete structure is aggravated, and the degradation rate of the structural performance is accelerated, which seriously threatens the safety and service life of the structure. Among them, since the structure and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
Inventor 苗元耀牛荻涛陆炫毅周艳霞吕瑶傅宇方张守祺
Owner 西安建筑科大工程技术有限公司
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