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

Abstract

The invention discloses a unified control method of electric drive for corrosion of reinforced concrete structures, belonging to the technical field of civil engineering. The method is as follows: the Nernst-Planck equation is established according to the driving force of the particle field evolution in the concrete material under the action of the electric-driven unified corrosion control electric field; the thermodynamic model of the interaction between the pore solution and the hydration product of the concrete material during the particle field evolution process is established. , the Poisson equation of electric field distribution and the Richards equation of water transport are coupled into the Nernst-Planck equation; the electrode kinetic reaction of the steel-concrete interface under the action of electric field is considered to control the electric-driven unified corrosion; thus forming the basis for the electric-driven unified corrosion control of reinforced concrete structures Theoretical model; based on MATLAB language, the numerical model is solved by operator splitting algorithm. In the numerical calculation results, the distribution law of water content in concrete, ion concentration of pore solution, content of hydration products and local current density on the surface of steel bars can be obtained, which provides a 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...

AI Technical Summary

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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