KR19980077505A - Conductive Heated Concrete Using Cement - Google Patents

Abstract

The present invention is excellent in electrical heating efficiency and stable in the physical properties of the concrete does not change at high temperatures, and also has excellent durability in the repetitive process of heating and cooling for a long time electrically conductive heating that can be continuously maintained heat generation To provide concrete.

In order to achieve the above object, the electrically conductive heating concrete of the present invention is composed of a mineral bonding material, an electrically conductive material, an additive material, and an auxiliary material, and in particular, cement is used as the mineral bonding material.

Description

Conductive Heated Concrete Using Cement

The present invention relates to electrically conductive heating concrete of a new composition.

More specifically, the electrically conductive exothermic concrete of the present invention is an additive material for suitably utilizing the physical properties required for mineral bonding materials, electrically conductive materials for conducting electricity, building equipment products of electrically conductive exothermic concrete, and general The material used as a substitute for sand used in the manufacture of concrete is composed of auxiliary materials suitable for each characteristic, and it can generate electricity efficiently and have stability and durability that can withstand high temperature for a long time. have.

The electrically conductive heating concrete of the present invention is a runway, a freezing area of a road, a bridge, a branch of a railroad, a railroad, a railroad, a railroad, a farm product of the airport for the reduction of the labor force necessary to remove the floor, a wall, a snowfall or a freezing of a residential or production facility It can be used for heating and construction equipments such as drying facilities, and various electric appliances used in various temperature areas such as irons and radiators.

The development of electrically conductive heating concrete started with the development of radio-blocking concrete. With the development of information and communication technology, the leakage of information through radio wave conducting media has been a problem, and the research on the development of building materials to shield radio waves has been carried out.Rebet, a radio wave blocking concrete shielding radio waves, has been developed. . Levet consists of general mineral bonding material and graphitized cokes, which are electrically conductive materials. In the development of radio-blocking concrete, it was found that when concrete absorbs radio waves, it blocks radio waves and generates heat. .

On the other hand, along with the study of concrete that absorbs radio waves, research was conducted on concrete that conducts electricity, and thus Betel, an electrically conductive concrete, was developed. The electrically conductive concrete is made of a general mineral bonding material and various tars, and is used for protective grounding facilities in the vicinity of electric wires in case of an electric wire accident because it conducts electricity well.

The electrically conductive heating concrete should be suitable for converting electrical energy into thermal energy over a long period of time, so that the heating efficiency should be good, and the stability that the physical properties of the concrete do not change at high temperatures should be excellent. The products manufactured by using the temperature control switch is used because it is necessary to maintain a constant temperature in various temperature ranges according to the purpose of use. The characteristics required for heating concrete, such as durability (durability) does not change the properties of the concrete is required.

The electromagnetic wave shielding concrete or the electrically conductive concrete described above is not suitable for directly using the conductive heat generating concrete because its use due to its inherent function is different from that of the electrically conductive heating concrete. In other words, in the case of the levet, which is radio wave blocking concrete, the shielding of radio waves emitted from various facilities or facilities is the main purpose, and in the case of Betel, which is electrically conductive concrete, the electric conductivity is the main purpose. Therefore, it does not show the durability and the stability to function even at high temperatures, even when the power switch is repeatedly opened and closed a number of times over a long period of time (actually maintaining a permanent function). I can't.

Accordingly, the present inventors have attempted to develop concrete capable of maintaining a function as a heating mechanism without changing physical properties in the process of repeatedly opening and closing a power switch over a large number of times while using a heated product for a long time in various heating temperature ranges. . This technical task can only be achieved by determining strict criteria for the various requirements for use in the manufacture of heating appliances in the composition of concrete, as well as the selection of a series of technical issues.

The present invention is excellent in electrical heating efficiency and stable in the physical properties of the concrete does not change at high temperatures, and also has excellent durability in the repetitive process of heating and cooling for a long time electrically conductive heating that can be continuously maintained heat generation To provide concrete.

FIG. 1 shows a temperature change that occurs when 50 V of electricity is applied to a 2.5 cm × 2.5 cm × 30 cm specimen prepared by mixing cement, graphite auxiliary material, and water.

In order to achieve the above object, the electrically conductive heating concrete of the present invention is composed of a mineral bonding material, an electrically conductive material, an additive material, and an auxiliary material, and in particular, cement is used as the mineral bonding material.

In general, concrete is used to make concrete for various uses by adding auxiliary material of aggregate component that shows various characteristics in mineral bonding material.

In the present invention, it is possible to flow electricity by putting an electrically conductive material in the cement as a mineral binder, chromite, magnesium, refractory clay, quartz, red brick, loess, fly ash, steel slag, combustion residues of fuels, etc. Of various aggregate aids and finely divided additives are added to make the electrically conductive heating concrete. These finely ground additives are added to improve the function and economic properties of the concrete and the physical properties of the electrically conductive heating concrete. These are mainly obtained by grinding the materials listed as auxiliary materials for the aggregate.

When the graphite auxiliary material is mixed with the cement, the cement, the cement can conduct electricity and generate heat. However, the components of the concrete are changed by the high heat generated at this time, so that the concrete is melted or broken so that the concrete cannot serve as concrete. Therefore, in the technology related to the electrically conductive heating concrete, it is important to develop concrete that can generate low heat or can withstand high heat rather than a technology that generates high heat.

In the case of the electrically conductive concrete, unlike the metal, the higher the heat generation, the higher the heat resistance, the lower the electrical resistance as the heat generation amount is increased. The amount of heat can be adjusted.

In the present invention, the graphite material is added to the cement to obtain the electrically conductive concrete, and the exothermic temperature is controlled by controlling the components and the mixing ratios of the additives and auxiliary materials, and the electrically conductive heating concrete having stability and durability.

Materials that can be used as additives or auxiliary materials in the present invention include chromite, magnesium brick or metallurgical magnesite, fire clay (Chamotte), quartz, red brick, ocher, fly ash, steel slag or fuels Combustion residues, most of which are industrial wastes, can be used not only to produce electrically conductive heating concrete, but also to solve pollution problems.

In concrete technology, additives or auxiliaries are distinguished by their particle size, usually additives have a size of about 0.15 mm or less, and auxiliaries have a size between about 0.15 and about 5 mm.

The additive material is a fine powder and the particles are fine to play a role of filling. In the present invention, the additive material not only plays a role of filling, but also reduces the contact surface of the graphite-containing material, which is an electrically conductive material, thereby increasing the resistance, thereby preventing the temperature from rising to a high temperature, thereby acting as an exothermic temperature regulator.

Auxiliary materials are relatively large particles and function as aggregates to impart various physical properties such as durability and heat resistance to concrete.

In the present invention, the auxiliary material not only functions as an aggregate, but also exhibits heat resistance, durability, and the like at high temperatures, thereby preventing the concrete from changing. Therefore, the auxiliary material that functions as aggregate is selected and used according to the physical properties required by the product to use the electrically conductive heating concrete.

For example, it is recommended to use chromite iron or fire clay with high heat resistance as the additive material for high temperature heating products, and brick dust and basalt sand as additive materials for low temperature heating products. It is good to use.

It is important not only to select the components of the mineral binder, the electrically conductive material, the additive material or the auxiliary material in the manufacture of the electrically conductive heating concrete, but also the mixing ratio thereof. The blending ratio of each of these components depends on the type of cement used.

The cement used in the present invention includes alumina cement, portland cement, slag cement. When using alumina cement or slag cement, it is preferable to add at least 55% of the total weight of the graphite material, and when using portland cement. 40% or more is preferable.

In addition, when using alumina cement, the additive is not used. In case of Portland cement, the additive is added in the same amount as cement, and when slag cement is added, it is about 30% or more of the amount of cement. Add the additives.

Auxiliary materials are added according to the amount of auxiliary materials applied in the manufacture of ordinary concrete.

Water requirements is suitable 150-300 liters per 1m ³ in some cases.

Hereinafter, a mineral binder, an electrically conductive material, an additive material, and an auxiliary material used in the electrically conductive heating concrete will be described in detail.

I. Components of Conductive Heated Concrete

1. Mineral binder

The electrically conductive heating concrete composition requires a mineral binder, and mineral binders include cement, lime, gypsum, and the like. In the present invention, cement is mainly used as a mineral binder, and cement includes alumina cement, portland cement, slag cement, and the like.

It is most preferable to use alumina cement as the cement, followed by Portland cement and slag cement, and these cements comply with the governmental notification standard.

When using slag cement If powder contains more than 50%, no powdered additives are used. Powdered additives are not used when using alumina cement.

If chromite is used as an additive to Portland cement, the free silicon content of chromite should not exceed 3%.

Cement used in the manufacture of the electrically conductive heating concrete is not good too low compressive strength, it is preferable to use a cement having a compressive strength of 400kg / cm ² or more.

2. Electrically conductive material

Graphite-containing materials are used as the electrically conductive material. Graphite auxiliary materials include graphite, or graphitized coke. The particle size of the graphite-containing material shall be at most 5 mm and at least 0.15 mm. In the graphite-containing material, more than 5mm should not exceed 5% of the total amount, and less than 0.15mm shall not exceed 25%.

3. Additives

Additives that can be used include chromite, chamotte, quartz, red brick pieces, steel blast furnace slag, basalt, rock rock, andesite, tuff, magnesite bricks, metallurgical magnesite and talc. When iron or magnesite components are used as additives, it is preferable to add chemical stabilizers, and chemical stabilizers include ash powder and orthophosphorous acid. The ash powder should contain at least 19% phosphoric anhydride on a dry basis.

The additive material is relatively small particles, and the particle size of the powdered additive material is about 0.15 mm or less, and it is preferable to pass 70% or more through the 100 mesh (Tyler Mesh No. 100), In the case of quartz, it is preferable to pass 85% or more of the 100 mesh (Tyler Mesh No. 100), and residual residue after passing through the 16 (Tyler Mesh No. 16) should not exceed 5%. The remaining material after striking 16 may be considered an auxiliary aid for aggregates, but not as a powdery additive.

The particle size of the powdered additive is measured by sieving 100 g of the mixed sample.

Hereinafter, the components that can be used as additives will be described in detail.

1) Chromite

Chromium iron ore, used as a powdery additive in electrically conductive heating concrete, contains 45% or more of chromium oxide (Cr ₂ O ₃ ), 8% or less of silicon oxide (SiO ₂ ), 16% or less of iron oxide (Fe ₂ O ₃ ), and It should contain iron monoxide (FeO) in terms of iron oxide and less than 1.5% calcium oxide (CaO).

2) magnesium component

Magnesium additives include magnesium brick chips or metallurgical magnesite. Magnesium brick pieces or metallurgical magnesite are industrial wastes, and in order to be used as additives for electrically conductive heating concrete, scraps or other impurities must be removed.

a. Magnesium brick pieces

Magnesium brick particles must meet the requirements of heat resistance and compressive strength.

b. Metallurgy Magnesite

Metallurgical magnesite used as an additive for electrically conductive heating concrete includes mine powder or electric furnace powder.

Metallurgical magnesite usable as an additive should contain at least 88% magnesium oxide (MgO), up to 4% silicon oxide (SiO ₂ ), and up to 4% calcium oxide (CaO), with an Ignition Loss of 0.6 Must not exceed%

3) Chamotte

Refractory clay, which can be used as an additive for electrically conductive heating concrete, uses industrial wastes, removes debris and other impurities, grinds particles, and the particles must meet the following requirements.

a. Heat resistance of 1600 degrees Celsius;

b. Compressive strength-more than 10.0MPa

c. Do not melt or form glass material by high temperature.

Acid refractory clays containing more than 0.3% lactate (on SO ₃ basis) cannot be used.

4) quartz

Quartz that can be applied as a powdery additive is quartz sand, which must contain at least 90% silicon oxide (SiO ₂ ).

5) red brick

Masonry powder obtained by pulverizing residues from general bricks, tiles, pottery sculptures and other parts of the ceramic industry should not contain other external impurities. The compressive strength of ordinary red brick particles should be 10 MPa or more.

6) ocher

Ocher should contain 70% or more of silicon oxide (SiO ₂ ), 5% or less of iron oxide (Fe ₂ O ₃ ), 8% or less of calcium oxide (CaO), and the loss of burning should not exceed 8%. Clays mixed with ocher sand should contain at least 65% silicon oxide, at most 8% iron oxide, and at most 8% calcium oxide, and the loss of burning should not exceed 10%.

7) Fly Ash

The fly ash should contain at least 25% aluminum oxide, the sulphate at 4% or less (based on SO ₃ ) and the loss of burning should not be more than 8%.

The particle size of the fly ash is measured by sieving 100 g of the mixed sample, and at least 85% of the material must pass through Tyler 100.

8) Seasonal Slag

Steel slag is also known as blast furnace slag, and steel slag, which can be used as an auxiliary material for electrically conductive heating concrete, must be resistant to any form of breakdown, and free from any external foreign mixtures or garbage. The total content of calcium oxide should not exceed 45% per slag weight and the slag basicity coefficient should be 10 or less.

9) combustion residues of fuels

Remaining residues after burning the fuel stream should contain at least 75% silicon oxide, aluminum oxide (SiO ₂ + Al ₂ O ₃ ), and no more than 4% calcium oxide (CaO), and the burning loss should not exceed 3%. .

4. Auxiliary Substances

Auxiliary materials are relatively large particles, the maximum size of the particles should be 5mm, the minimum size is 0.15mm, the fine particles exceeding the maximum particle size of 5mm should not exceed 5% of the total amount, the minimum particle size 0.15mm Smaller particles should be 25% or less.

Particle Composition of Preferred Auxiliary Materials

Sieve size (mm) 5 1.2 0.15 % By weight of fine particles remaining through a sieve 5-0 55-20 100-75

The particle size of the auxiliary material of the electrically conductive heating concrete is measured by sieving 1 kg of mixed sample.

1) Chromite

Chromium ore is a high-density microparticle, and chromite ore containing harmful impurities must be used only after passing the following tests.

Take 5kg of chromite mixed sample containing impurities, keep chromite ore at maximum temperature 900 ℃ for 2 hours, cool and store for 7 days in dry state. If the material is not broken after these tests, the chromite is suitable for the production of electrically conductive heating concrete.

2) magnesium component

Magnesium supplements include magnesium brick chips or metallurgical magnesite. Magnesium bricks or metallurgical magnesite use industrial waste, and in order to use them as an auxiliary material for electrically conductive heating concrete, scraps or other impurities must be removed.

a. Magnesium brick pieces

Magnesium brick particles must meet the requirements of heat resistance and compressive strength, and must not be lower than the heat resistance or strength corresponding to the products manufactured.

b. Metallurgy Magnesite

Metallurgical magnesite used as an auxiliary material for electrically conductive heating concrete includes mine powder or electric furnace powder.

Metallurgical magnesite that can be used as an auxiliary material should contain not less than 92% magnesium oxide (MgO), not more than 1.6% calcium oxide (CaO) and a loss of burning of not more than 0.5%.

3) Chamotte

Refractory clay, which can be used as an auxiliary material for electrically conductive heating concrete, is industrial waste, which removes debris and other impurities, grinds the particles, and the particles must meet the following requirements.

a. Heat resistance of 1600 degrees Celsius;

b. Compressive strength-more than 10.0MPa

c. Do not melt or form glass material by high temperature.

Acid refractory clays containing more than 0.3% lactate (on SO ₃ basis) cannot be used.

4) red brick

Masonry powder obtained by pulverizing residues from general bricks, tiles, ceramics and other ceramic industry parts shall not contain other external impurities, eg other wastes or chemical solutions. The compressive strength of ordinary red brick particles should be 10 MPa or more.

5) Steel Slag

Steel slag is also known as blast furnace slag, and steel slag, which can be used as an auxiliary material for electrically conductive heating concrete, must be resistant to any form of breakdown, and free from any external foreign mixtures or garbage. The total content of calcium oxide should not exceed 45% per slag weight and the slag basicity coefficient should be 10 or less.

II. Mixing ratio of ingredients

As a parameter required for electric conductive heating concrete making concrete mixture 1m ³ per cement requirement C (kg), the non-G (weight ratio), the concrete mixture of the graphite amount with respect to the additive query ratio D (weight ratio), the total amount of the cement quantity 1m ³ There is a water consumption W (liter), and the variables are determined as follows according to the type of concrete for each compressive strength.

1) Ratio of additive amount to cement amount (D)

In the case of electrically conductive heating concrete composed of alumina cement, no additives are used (D = 0).

In the case of electrically conductive heating concrete composed of portland cement, about 100% of the additive material is used based on the amount of portland cement (D = 1). However, about 50% of fly ash is used for fly ash (D = 0.5).

In the case of electrically conductive heating concrete composed of slag cement, approximately 30% of additives are used (D = 0.3).

2) The ratio of graphite to the total amount of electrically conductive heating concrete (G)

In the electrically conductive pyrogenic concrete composed of portland cement containing additives, the weight ratio of the graphite-containing material is preferably about 40% or more of the total amount (G = 0.4).

In the electrically conductive heating concrete composed of aluminum oxide cement and slag cement, the weight ratio of the graphite-containing material is preferably about 55% or more of the total amount.

3) requirement of water per 1m ³ of concrete (W)

The required amount of water is suitable from 150 to 350 liters per 1 m ^{3 of} concrete, depending on the degree of porosity and humidity of the auxiliary material.

In order to determine the value of the variable W of water in relation to the amount of cement (C) in the electrically conductive heating concrete, the following tests are made. To do this, after preparing the sample (7.07 × 7.07 × 7.07cm ³⁾ was added the amount of water already determined empirically using a set of concrete 300, 350 or 400kg cement per 1m ³ consisting of three kinds having the proper viscosity, such as strength test Determine the ratio of water to amount of cement by measuring its physical properties.

III. Manufacturing method of electrically conductive heating concrete

In the case of electroconductive heating concrete made of alumina cement, after 3 days of production under normal conditions, and after 7 days of manufacturing in Portland cement or slag cement, 32 to 100 degrees Celsius after 32 days It is dried for about an hour and manufactured by cooling.

The electrically conductive heating concrete is selected according to the specific product to be used. The molding methods include compression, extrusion, filling by simple vibration, and coating by simple plastering.

The essential components and contents of the essential materials required for the production of various products made of electrically conductive heating concrete are as follows.

1. Alumina Cement

1) Consists of auxiliary materials of alumina cement and chromite mineral:

Aluminum Oxide Cement ------------------- 300-500kg

Graphite Sand --------------------------------- 800-1300kg

Chromium iron ore sand ------------------------ 600-1500kg

2) Consists of alumina cement and refractory clay auxiliary materials:

Alumina Cement ------------------------ 300-500kg

Graphite Sand --------------------------------- 800-1300kg

Fire Clay (-) ------------------------- 600-800kg

2. Portland Cement

1) Consists of Portland cement and fireclay auxiliary materials:

Portland Cement ----------------------- 250-500kg

Graphite Sand -------------------------------- 800-1300kg

Refractory Clay Powder ------------------------- 200-400kg

Refractory Clay Sand ------------------------ 500-1100kg

2) Consists of Portland cement and red brick auxiliary materials:

Portland Cement ----------------------- 250-500kg

Graphite Sand -------------------------------- 800-1300kg

Brick Grain ------------------- = ---------- 250-350kg

Plain Brick Powder ------------------------- 400-600kg

3) Consists of Portland cement and fly ash / basalt aids:

Portland Cement ----------------------- 250-500kg

Graphite Sand -------------------------------- 800-1300kg

Fly Ash --------------------------- 100-200kg

Basalt Sand ------------------------------ 500-800kg

4) Consists of Portland cement and chromite ore auxiliary materials:

Portland Cement ----------------------- 250-500kg

Graphite Sand -------------------------------- 700-1300kg

Magnesite Powder --------------------- 50-200kg

Chrome Steel Powder ------------------------ 500-750kg

Ash earth powder * ------------------------- 15-30kg

Chrome iron ore --------------------------- 600-1000kg

* As an alternative to ash powder, 1.5-3 liters of orthophosphorous acid at 85% concentration can be used.

Hereinafter, the conductive heating concrete will be described in more detail with reference to Examples, and the following Examples illustrate the present invention, and the claims of the present invention are not limited to the following Examples.

Example 1

The following experiments were conducted to investigate the feasibility of producing electrically conductive heating concrete using raw materials produced in Korea.

Portland cement produced by Hyundai Cement Co., Ltd. was used as the cement used in this experiment, and Hyundai Cement Co., Ltd. was used as the graphite auxiliary material. The composition ratio of each component is shown in Table 1.

TABLE 1

No. X ₁ X ₂ X ₃ One 0.65 550 1100 2 0.55 550 1100 3 0.65 450 1100 4 0.55 450 1100 5 0.65 550 900 6 0.55 550 900 X ₁ is the amount of water to cement X ₂ is the amount of cement X ₃ is the amount of graphite auxiliary

1 shows a temperature change occurring after fabricating a matrix having the composition ratio and flowing a current of 50V.

As a result of the experiment, it was confirmed that an electrically conductive heating concrete can be manufactured using raw materials of the Republic of Korea.

Example 2

After mixing 150g of alumina cement, 450g of graphite sand and 350g of chromite iron sand, 75ml of water was added and kneaded to make a sample of 2.5cm × 2.5cm × 30cm (wire terminal connection at both ends) and left for 3 days, then 100 ℃ After drying for 32 hours at room temperature.

Example 3

After mixing 150g of Portland cement, 400g of graphite sand, 120g of refractory clay powder and 300kg of refractory clay, add 75ml of water and knead the mixture to make a 2.5cm × 2.5cm × 30cm sample sample (wire terminal connection at both ends). After standing, it was dried at 100 ° C. for about 32 hours and then left at room temperature.

Example 4

After mixing 150g of Portland cement, 500g of graphite sand, 75g of fly ash, and 300g of basalt sand, 75ml of water was added and kneaded to make a 2.5cm × 2.5cm × 30cm sample specimen (wire terminal connection at both ends) and left for 7 days. After drying at 100 ° C. for about 32 hours, the mixture was left at room temperature.

The electroconductive heating concrete obtained in Examples 2 to 4 was divided into three groups, and the first group maintained the maximum exothermic temperature through current, and the second group was fixed at 500 ° C. by attaching a temperature control switch, and the third group. Silver temperature control switch was fixed at 200 ℃. Table 2 shows the results of checking the appearance and measuring the compressive strength for 30 days.

TABLE 2

As can be seen from the experimental results, the electrically conductive heating concrete of the present invention did not change for 30 days even at a high temperature of 1100 ℃, there was no change even at 200 ℃ and 500 ℃ when the opening and closing of the power is repeated a myriad .

Through the above test results, it can be seen that the electrically conductive heating concrete of the present invention withstands the operation for a long time at a temperature of 1 to 10 times or more of the use temperature range of the heated product using the concrete, and maintains the normal function as possible. have.

It can be seen that the proper use temperature level of the heating apparatus manufactured by using the electrically conductive heating concrete of the present invention reaches 500 ° C. However, in the specific heating apparatus, the heating and closing operation of the heating apparatus is performed for several decades or even hundreds of years. In order to guarantee the production of a product that can function permanently, it is better to design the actual product to have a working temperature of 200 ° C. or lower, because the heating and cooling must withstand repeated conditions. Concrete is an excellent concrete in which these conditions have stability and durability.

Claims (15)

An electrically conductive heating concrete comprising a mineral bonding material, an electrically conductive material, an additive material, an auxiliary material, and water. The electrically conductive heating concrete of claim 1, wherein the mineral bonding material includes cement, gypsum, lime, and the like, and the cement includes alumina cement, portland cement, slag cement. The electrically conductive heating concrete of claim 1, wherein the electrically conductive material is a graphite auxiliary material. The method of claim 3, wherein the auxiliary material is a fine powder having a maximum particle size of 5 mm and a minimum particle size of 0.15 mm, wherein the fine particles larger than the maximum particle size are 5% or less, and the fine particles smaller than the minimum particle size are 25% or less. Electroconductive heating concrete. The additive material of claim 1, wherein the additive material is chromite, magnesium, brick, metallurgical magnesite, refractory clay, quartz, red brick, loess, fly ash, steel slag, combustion residues of fuels, basalt, rock rock, andesite Electroconductive heating concrete, comprising tuff, talc, talc, and the like. 6. The electrically conductive heating concrete according to claim 5, wherein the additive material is powdery and has a particle size of 70% or more that passes through Tyler 100. 7. The electrically conductive heating concrete according to claim 6, wherein the particle size passes 80% of Tyler 100 when the additive material is fly ash or quartz. The iron oxide of claim 5 contains at least 45% of chromium oxide, not more than 8% of silicon oxide, not more than 16% of iron oxide and iron monoxide, and not more than 1.5% of calcium oxide, and the metallurgical magnesite is not less than 88% of magnesium oxide. It contains 4% or less of silicon and 4% or less of calcium oxide and the burning loss does not exceed 0.6%. Quartz is quartz sand and contains 90% or more of silicon oxide. Yellow soil is 70% or more of silicon oxide and iron oxide. It contains less than 8% calcium oxide and less than 10% of burning loss, fly ash contains more than 25% of aluminum oxide and less than 4% of lactate (SO ₃ standard) and less than 8% of burning loss. In steel slag, the total content of calcium oxide is not more than 45% per slag weight, the slag basicity coefficient is 10 or less, and the combustion residues of fuels are more than 75% of silicon oxide and aluminum oxide and 4% or less of calcium oxide. Electrically conductive heating concrete, characterized in that it does not exceed 3%. The conductive material of claim 1, wherein the auxiliary material includes chromite, magnesium brick, metallurgical magnesite, refractory clay, steel slag, or red brick. 10. The method of claim 9, wherein the auxiliary material is a fine powder having a maximum particle size of 5 mm and a minimum particle size of 0.15 mm, wherein the fine particles larger than the maximum particle size are 5% or less and the fine particles smaller than the minimum particle size are 25% or less. Electroconductive heating concrete. 10. The metallurgical magnesite used as an auxiliary material is magnesium oxide of 92% or more, calcium oxide of 1.6% or less, burning loss of 0.5% or less, refractory clay has a heat resistance of 1600 degrees and a compressive strength of 10.0 Mpa or more. Electroconductive heating concrete characterized in that there is no melting or glass formation and the steel slag has a basicity factor of 10 or less. The method of claim 3, wherein when the mineral bonding material is alumina cement or slag cement, the graphite component is added to about 55% or more of the alumina cement, and when the mineral bonding material is Portland cement, the graphite component is to be added to about 40% or more of the portland cement. Electroconductive heating concrete, characterized in that. The method of claim 2, wherein the mineral binder is alumina cement is not added to the additive material, when the mineral binder is Portland cement, the additive material is about 100% to the amount of Portland cement, the mineral binder material is In the case of slag cement, the additive material is electrically conductive heating concrete, characterized in that about 30% of the amount of slag cement is used. 15. The electrically conductive heating concrete of claim 13, wherein when the mineral bonding material is Portland cement and the additive material is fly ash, about 50% of the additive material is used based on the amount of Portland cement. The method of claim 1, wherein water is electrically conductive, characterized in that the heating concrete produced was added to 150-350 liters per 1m ³ of concrete.