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cp anode function and stress self-sensing integrated intelligent composite material

A composite material and nanocomposite material technology, applied in the field of CP anode function and stress sensing integrated intelligent composite material, can solve the problems of cathodic current delivery efficiency affecting CP system, insufficient structural protection of CP system, aging of anode material, etc. The effect of improving the resistance to erosion particles, reducing the permeability, and prolonging the service life

Active Publication Date: 2014-10-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most important reasons for the failure of CP include two aspects: (1) The lack of an expert system to evaluate the effect of CP, which leads to the failure of the CP system to make effective adjustments according to the real-time service status of the structure during the operation process, which leads to the CP system’s Insufficient or excessive protection; (2) The CP system is in a continuous working state, which leads to aging and failure of the anode material, which seriously affects the cathode current delivery efficiency of the CP system

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Construction of CP anode system

[0025] In the engineering structure, the overall structure of the CP system is as follows: figure 1 As shown, including anode material, steel cathode and rectifier system to apply electric field load. Before the anode system is laid out, it is necessary to evaluate the overall and local corrosion status of the structure based on the overall corrosion monitoring results of the structure, and delineate the areas that require corrosion control. Then, the anode system is laid out for the specific area. First, clean up the area where the anode needs to be laid, such as removing the contaminated concrete surface, or even replace severely deteriorated local components; second, re-concrete the treated components; third, repair concrete or other materials. The main anode of Ti slats is laid on the surface, and then coated with sprayed cement-based nano-composite materials. After the thickness reaches 0.5-1cm, the surface is pressed into the Ti...

Embodiment 2

[0027] CP anode material composition and structure form

[0028] CP anode function and stress sensing integrated smart composite material structure such as figure 2 As shown, it generally includes a four-layer structure, the first layer is the main anode of Ti slats, the second layer is embedded Ti mesh, the third layer can spray cement-based nanocomposites, and the fourth layer is carbon fiber cloth. Among them, the main components of cement-based nanocomposites include polyacrylamide or PVA fibers, carbon fibers or carbon nanofibers, carbon nanotubes, carbon black particles or graphene, P.O. series cement, and pumping agents. Mix evenly according to the proportion, and use the traditional concrete pumping technology for construction, in which the weight ratio of water and cement-based nanocomposite is 0.4-0.6. A typical formulation used is as follows:

[0029] Table 1 Typical formula of smart composite materials

[0030]

[0031] Organic materials such as polyacrylami...

Embodiment 3

[0033] Four-electrode method for measuring stress state

[0034]During spraying of the CP anode with cement-based nanocomposites, the image 3 The four-electrode system shown. During the stress state test, the electrodes at both ends apply an electric field, and the changes in the conductivity of the concrete are measured through the two electrodes in the middle. Combined with the quantitative relationship curve between conductivity and strain, the corresponding relationship between conductivity and stress is obtained, so as to determine the structure of the location of the four electrodes. stress level.

[0035] The basic principle of the invention is the corrosion electrochemical activity of the material and the pressure-sensitive property of the cement-based smart material. The CP anode requires materials with high inertness to ensure that the anode current can be effectively delivered to the area where the structure needs to be protected. However, the high current densi...

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Abstract

The invention discloses a CP anode function and stress self-induction integral intelligent composite material comprising a Ti lath main anode, a Ti net auxiliary anode, a cement-based nanometer composite material and carbon fiber cloth; the Ti lath main anode is connected with the Ti net auxiliary anode, the cement-based nanometer composite material is covered on the Ti net auxiliary anode, and the carbon fiber cloth is paved on the cement-based nanometer composite material; and the preparation method of the cement-based nanometer composite material comprises the steps of uniformly mixing 5% of polyacrylamide, 0.5% of carbon fibers or nanometer carbon fibers, 15% of carbon black granules, 0.2% of pumping aid, 1.0% of nanometer SiO2 and 79.3% of P.0.42.5 according to mass percent, and constructing through traditional concrete pumping technology, wherein the weight ratio of water to the cement-based nanometer composite material is 0.4-0.6. The CP anode function and stress self-induction integral intelligent composite material disclosed by the invention is convenient in construction, capable of greatly prolonging the service life of the anode material, high in conductivity and is capable of monitoring the stress distribution state of the critical region of a steel concrete structure in real time.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to an intelligent composite material integrating CP anode function and stress perception. Background technique [0002] The latest statistics from the World Corrosion Organization (WCO) show that the global economic loss due to corrosion exceeds 2.2 trillion U.S. dollars per year. With the deterioration of the global climate and environment, corrosion problems are bound to show a growing trend, and the corrosion of steel-concrete structures is attracting close attention from all over the world. The steel-concrete structure is one of the main structural types that will be used for a long time now and in the future, and the corrosion of steel bars is the main reason for the reduction of the durability of the steel-concrete structure. According to the survey by the National Materials Advisory Committee of the United States, nearly 253,000 concrete bridge decks have serious corrosion; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/64C04B28/04
Inventor 乔国富肖会刚洪毅欧进萍
Owner HARBIN INST OF TECH
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