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Conductive concrete for tower grounding and preparation method thereof

A technology of conductive concrete and pole towers, which is applied in the field of grounding material preparation, can solve the problems of increased volume resistivity of cement-based composite materials, poor conductivity improvement effect, and further improvement of conductivity, so as to achieve impermeability and frost resistance Good economical performance, improved compactness and mechanical properties, and strong plasticity

Inactive Publication Date: 2019-08-27
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among all conductive phase materials, graphite cement-based composite materials have the lowest cost and are the most widely used. However, compared with other conductive phase materials, graphite is not effective in improving the conductivity of cement-based composite materials. Reduce the mechanical strength of cement-based composite materials to a certain extent; carbon black can improve the electrical conductivity of cement-based composite materials better than graphite, but carbon black has low strength, high water absorption, and poor mechanical properties; although wind-quenched steel slag can strengthen cement-based composite materials. The mechanical strength of the composite material, but because the main conductive component FeO content in the wind-quenched steel slag is too low (about 18% to 30%), the electrical conductivity is too poor; the carbon fiber and steel fiber of the fiber type have a great influence on the conductivity of the cement-based conductive composite material. The performance improvement effect is the best, and the mechanical strength of cement-based conductive composite materials is also improved to a certain extent, but the cost is relatively high. At the same time, carbon fibers have dispersion problems in cement-based composite materials, and steel fibers will have passivation problems in cement-based composite materials. Increased volume resistivity of cement-based composites
In recent years, stainless steel materials with relatively stable conductivity under non-extreme (strong acid, strong alkali) conditions have been used more and more in grounding projects. As a material that is not easily corroded, stainless steel fibers as a conductive phase material overcome the steel The disadvantage of easy passivation of fibers is still less researched
For example, the patent No. 201110277851.7 is corrosion-resistant high-strength conductive concrete and its preparation method. Graphite and conductive fibers are used as conductive fillers. The conductivity and corrosion resistance of concrete are improved, but its compressive strength is low and its conductivity is still low. To be further improved

Method used

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  • Conductive concrete for tower grounding and preparation method thereof
  • Conductive concrete for tower grounding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Preparation of polyaniline / bentonite composite material:

[0031] Weigh bentonite and cetyltrimethylammonium bromide according to a mass ratio of 5:1, dissolve in distilled water, soak statically at 80°C for 72h, filter, dry at 60°C, grind and sieve;

[0032] Prepare the hydrochloric acid solution of 2mol / L and the ammonium persulfate solution of 2mol / L, take quantitative bentonite through the above-mentioned organic treatment, add in the three-necked flask, pass into nitrogen in the three-necked flask, add aniline, hydrochloric acid solution successively, in Add ammonium persulfate dropwise under magnetic stirring at 15°C, and control the molar ratio n (aniline): n (hydrochloric acid): n (ammonium persulfate) = 1:0.5:1. After the reaction is complete, pour the obtained dark green mixture into In a G4 funnel, wash with distilled water until the filtrate becomes colorless; dry the filtered and washed powder at 60°C for 48 hours, and grind it into a fine powder in a m...

Embodiment 2

[0038] (1) Preparation of polyaniline / bentonite composite material:

[0039] Weigh bentonite and cetyltrimethylammonium bromide according to a mass ratio of 5:1, dissolve in distilled water, soak statically at 80°C for 72h, filter, dry at 60°C, grind and sieve;

[0040] Prepare the hydrochloric acid solution of 2mol / L and the ammonium persulfate solution of 2mol / L, take quantitative bentonite through the above-mentioned organic treatment, add in the three-necked flask, pass into nitrogen in the three-necked flask, add aniline, hydrochloric acid solution successively, in Add ammonium persulfate dropwise under magnetic stirring at 20°C, and control the molar ratio n (aniline): n (hydrochloric acid): n (ammonium persulfate) = 1:0.5:1. After the reaction is complete, pour the obtained dark green mixture into In a G4 funnel, wash with distilled water until the filtrate becomes colorless; dry the filtered and washed powder at 60°C for 48 hours, and grind it into a fine powder in a mor...

Embodiment 3

[0046] (1) Preparation of polyaniline / bentonite composite material:

[0047] Weigh bentonite and cetyltrimethylammonium bromide according to a mass ratio of 5:1, dissolve in distilled water, soak statically at 80°C for 72h, filter, dry at 60°C, grind and sieve;

[0048] Prepare the hydrochloric acid solution of 2mol / L and the ammonium persulfate solution of 2mol / L, take quantitative bentonite through the above-mentioned organic treatment, add in the three-necked flask, pass into nitrogen in the three-necked flask, add aniline, hydrochloric acid solution successively, in Add ammonium persulfate dropwise under magnetic stirring at 10°C, and control the molar ratio n (aniline): n (hydrochloric acid): n (ammonium persulfate) = 1:0.5:1. After the reaction is complete, pour the obtained dark green mixture into In a G4 funnel, wash with distilled water until the filtrate becomes colorless; dry the filtered and washed powder at 60°C for 48 hours, and grind it into a fine powder in a m...

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Abstract

The invention provides conductive concrete for tower grounding. The conductive concrete is prepared from, by weight, 100-150 parts of cement, 100-150 parts of aggregate, 50-120 parts of water, 40-65 parts of graphite, 2-8 parts of stainless steel fiber, 1-5 parts of a polyaniline / bentonite composite material and 0.5-3 parts of an auxiliary. The graphite and the stainless steel fiber are compoundedinto a main conductive doping phase, and the polyaniline / bentonite composite material and the auxiliary are added so that the conductive performance and mechanical strength of the conductive concretecan be effectively improved, the electrical resistivity of the conductive concrete is smaller than or equal to 0.015 ohm.m, the compressive strength is 45-50 MPa, and the bending strength is 6.5-7.5MPa.

Description

technical field [0001] The invention relates to a preparation method of grounding material, in particular to conductive concrete for grounding of power system towers and a preparation method thereof. Background technique [0002] With the continuous expansion of the scale of power grid construction and the increasingly tight transmission corridors, it has become common to build transmission lines in places with high soil volume resistivity (up to thousands). At the same time, during the implementation of the national networking strategy, the EHV / UHV power transmission and transformation systems increase rapidly, the power transmission capacity increases, and the requirements for fault current also increase accordingly. The standard "GB50065-2011 Grounding Design Specification for AC Electrical Installations" requires the maximum grounding resistance R≤2000 / IG (IG is the effective value of the maximum grounding fault asymmetrical current entering the ground through the ground...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/94
CPCC04B28/04C04B2111/94C04B2201/50
Inventor 田旭裴锋程宏波刘欣贾蕗路李财芳邓辰星
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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