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Unified control method of electric drive for corrosion of reinforced concrete structures

A technology of reinforced concrete and control method, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems of not considering physical and chemical effects, low corrosion control efficiency, and failure to fully consider dynamic factors.

Active Publication Date: 2019-01-15
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

However, the current cathodic protection technology used in steel-concrete structures originated from petroleum, chemical, and shipbuilding industries. It only controls corrosion from the perspective of corrosion thermodynamics and liquid corrosion media, and fails to fully consider the kinetic factors of multi-phase and porous concrete media.
The currently developed technologies such as electrochemical dechlorination and electrochemical re-alkalization are based on controlling the kinetic factors of corrosion, but their general theoretical models do not take into account the physical and chemical interactions between the concrete pore solution and hydration products and the future Considering the kinetics of the electrode reaction at the yin-yang interface, resulting in low corrosion control efficiency, it is urgent to propose a unified control method for corrosion of reinforced concrete structures driven by electricity to overcome the disadvantages of traditional electrochemical corrosion control technology

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  • Unified control method of electric drive for corrosion of reinforced concrete structures
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  • Unified control method of electric drive for corrosion of reinforced concrete structures

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specific Embodiment approach 1

[0138] Specific implementation mode 1: This implementation mode records a unified control method for reinforced concrete structure corrosion electric drive, and the described method is specifically as follows:

[0139] The driving forces that determine the evolution of the particle field in the concrete material under the action of the unified corrosion control electric field driven by electricity are: the directional migration effect of the corrosion control electric field, the concentration diffusion effect, the convective effect of water transport, the galvanic effect between ions, and the pore solution and Interactions between hydration products; Nernst-Planck equations are established according to these driving forces;

[0140]

[0141] Among them, c i is the concentration of ion i, mol / m 3 ;t is the time of erosion environment; D i is the diffusion coefficient of the transport ion i in the pore fluid of the concrete material; z i is the number of charges carried by...

specific Embodiment approach 2

[0219] Specific embodiment 2: A kind of unified control method for reinforced concrete structure corrosion electrical drive described in specific embodiment 1, when using the operator splitting algorithm to solve the numerical model, the parameters of the model include: (1) each phase of the hydration product The content of components, only considering CH, C-S-H, AFt and AFm; (2) The concentration of free ions in the pore solution, namely K + 、Na + , Ca 2+ , SO 4 2- , Cl - and OH - ; (3) capillary porosity; (4) chloride ion transfer coefficient; (5) initial capillary moisture content in concrete; (6) moisture characteristic curve of concrete material.

[0220] The application of numerical model and calculation method established by the present invention is illustrated below in conjunction with specific case: figure 2 Schematic diagram of the geometric model adopted for the case. The steel bar was used as the cathode, and the titanium mesh was used as the anode, and the...

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Abstract

A method for unify control of corrosion electric drive of reinforced concrete structure belongs to that technical field of civil engineering. The method is as follows: according to the driving force of particle field evolution in concrete under unified electric field, Nernst-Planck equation; the thermodynamic model of interaction between pore solution and hydration product, Poisson equation of electric field distribution and Richards equation of water transport in concrete during particle field evolution are coupled into Nernst-Planck equation; Electrode Dynamics Response of Steel-Mixture Interface under Electric Field Considering Electric Drive and Unified Corrosion Control; thus, the basic theoretical model of unified corrosion control of reinforced concrete structure driven by electricity is formed. Based on MATLAB language, the numerical model is solved by operator splitting algorithm. In the numerical results, the distribution of water content, ionic concentration of pore solution, hydration product content and local current density on the surface of steel bar can be obtained, which provides scientific basis for corrosion control of reinforced concrete structures.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for unified control of reinforced concrete structure corrosion electric drive. Background technique [0002] Reinforced concrete structure is an important structural type that will be adopted in the field of civil engineering for a long time now and in the future, and the corrosion of steel bars is one of the most important reasons for reducing the durability of steel-concrete structures. On August 14, 2018, the Morandi Bridge in Italy collapsed suddenly, killing at least 43 people. At present, all signs indicate that the cause of the collapse was the bridge's long-term disrepair and corrosion. The well-known British media "The Economist" pointed out that the tragedy should draw the attention of the whole world to the monitoring and maintenance system of reinforced concrete structures. It is estimated that about 70-90% of the early failure accident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G16C20/10
CPCG06F30/20
Inventor 乔国富郭冰冰欧进萍
Owner HARBIN INST OF TECH
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