Preparation method of conductive fly ash ceramsite, concrete and preparation method thereof

Abstract

The present application relates to a kind of preparation methods of conductive fly ash ceramsite, concrete and its preparation method, high-iron fly ash containing magnetite and hematite is passed through reduction-magnetic separation-reduction sintering process, so that the ceramsite generated by sintering has the conductive effect with iron element, so that aggregate itself can be used as conductive material;When the conductive fly ash ceramsite is applied to structural and functional integrated conductive concrete, a complete conductive network is formed by the cooperation of conductive fly ash ceramsite and carbon fiber.The present application uses the conductive fly ash ceramsite that occupies the volume of concrete as conductive aggregate, and further improves the conductive performance of concrete by cooperating with a small amount of carbon fiber in cement paste, reduces the open circuit condition between ceramsite, and a small amount of carbon fiber addition does not have negative impact on the mechanical properties of concrete.

Description

Technical Field

[0001] This invention relates to the field of building materials, specifically to a method for preparing conductive fly ash ceramsite, concrete, and the same method. Background Technology

[0002] Conventional conductive concrete incorporates non-metallic conductive materials such as carbon fiber, carbon nanotubes, graphite, and carbon black, or metallic conductive materials such as steel fiber and steel slag, into cement paste. However, cement paste constitutes a limited volume of concrete, while aggregates, which make up a larger volume proportion, are not conductive, resulting in less than ideal conductivity. Increasing the amount of conductive materials in the cement paste can actually negatively impact the mechanical properties of the concrete. Existing technology, such as patent document CN112521076A, discloses a high-slump, high-strength conductive concrete made from iron tailings and its preparation method. This method uses iron ore waste rock as coarse aggregate and iron tailings sand and iron concentrate as fine aggregate to prepare conductive concrete. Summary of the Invention

[0003] To address the problems in existing conductive concrete, such as the non-conductive nature of aggregates occupying a large volume and the discontinuous conductivity between conductive materials, which leads to unsatisfactory conductivity when conductive materials are added and the negative impact of excessive dosage on the mechanical properties of concrete, this invention provides a method for preparing conductive fly ash ceramsite, concrete, and the same method. The invention uses high-iron fly ash to prepare conductive ceramsite, which is then applied as a conductive aggregate in concrete. Combined with a small amount of carbon fiber in the cement paste, this method not only improves the conductivity of the concrete but also ensures its mechanical properties.

[0004] The technical objective of this invention is achieved through the following technical solution:

[0005] A method for preparing conductive fly ash ceramsite, the method comprising:

[0006] S1. High-iron fly ash containing magnetite and hematite is placed in a roasting furnace and roasted at 800℃ for 30 minutes to obtain roasted fly ash A, which contains magnetite.

[0007] S2. Disperse calcined fly ash A in water to obtain calcined fly ash solution B. Separate the magnetic substances from calcined fly ash solution B to obtain wet high-magnetic fly ash C and low-magnetic fly ash solution D.

[0008] S3. Dry the wet high-magnetic fly ash C to constant weight to obtain high-magnetic fly ash; dry the low-magnetic fly ash solution D to constant weight to obtain low-magnetic fly ash.

[0009] S4. Granulate high magnetic fly ash to form fly ash ceramsite pellets E;

[0010] S5. Calcination of fly ash ceramsite pellets E under a reducing atmosphere includes three stages:

[0011] The first stage involves a preheating temperature of 400℃ and a preheating time of 30 minutes.

[0012] The second stage involves calcination at 1100℃ and sintering for 20 minutes.

[0013] In the third stage, rapid cooling for 15 minutes was performed until the temperature dropped to room temperature, yielding coarse conductive fly ash ceramsite F.

[0014] S6. The coarse conductive fly ash ceramsite F is sieved to obtain conductive fly ash ceramsite and conductive fly ash ceramsite sand, wherein the particle size of the conductive fly ash ceramsite is ≥5mm and ≤20mm, and the particle size of the conductive fly ash ceramsite sand is ≥1.25mm and <5mm.

[0015] Furthermore, the high-speed iron fly ash contains 14%–20% Fe2O3, 45%–54% SiO2, 25%–30% Al2O3, 0.5%–1% Na2O, 0.5%–1% K2O, 1%–4% CaO, 0.5%–3% MgO, and 4%–6% residual carbon.

[0016] Furthermore, the mass ratio of roasted fly ash A to water is 1:9 to 1:4.

[0017] Furthermore, the Fe2O3 content in high-magnetic fly ash is 45%–60%, while the Fe2O3 content in low-magnetic fly ash is 2%–6%.

[0018] Furthermore, the apparent density of conductive fly ash ceramsite is 2200–2500 kg / m³. 3 The cylinder compressive strength is 8-12 MPa.

[0019] Furthermore, the apparent density of conductive fly ash ceramsite is 2350–2600 kg / m³. 3 The cylinder compressive strength is 9–12 MPa.

[0020] Further, step S2 includes:

[0021] Step S21: Stir the calcined fly ash solution B with a magnetic rod with a magnetic induction intensity of 1T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod, and collect the magnetic material on the surface of the magnetic rod for later use; repeat the above process until the surface of the magnetic rod with a magnetic induction intensity of 1T no longer has magnetic material adsorbed.

[0022] Step S22: Stir the calcined fly ash solution B after the above step S21 by using a magnetic rod with a magnetic induction intensity of 1.2T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod with a magnetic induction intensity of 1.2T. Collect the magnetic material on the surface of the magnetic rod with a magnetic induction intensity of 1.2T for later use. Repeat the operation until the surface of the magnetic rod with a magnetic induction intensity of 1.2T no longer has magnetic material adsorbed.

[0023] Step S23: Mix the collected magnetic materials to obtain wet high-magnetic fly ash C, and process the calcined fly ash solution B through step S22 to obtain low-magnetic fly ash solution D.

[0024] The present invention also provides a structurally and functionally integrated conductive concrete, comprising, by weight parts: 200-220 parts cement, 60-70 parts low-magnetic fly ash, 90-100 parts mineral powder, 880-930 parts conductive fly ash ceramsite, 720-760 parts conductive fly ash ceramsite sand, 0.5-2 parts carbon fiber, 4-6 parts water-reducing agent, and 165-170 parts water, wherein the low-magnetic fly ash, conductive fly ash ceramsite, and conductive fly ash ceramsite sand are prepared by the above-described method for preparing conductive fly ash ceramsite.

[0025] Furthermore, the carbon fiber is a polyacrylonitrile-based carbon fiber, with a length of 5–8 mm, a diameter of 6–8 μm, and a density of 1.5–2 g / cm³. 3 It has a tensile strength of 4–8 GPa, a tensile modulus of 300–500 GPa, and a carbon content of >90%.

[0026] Furthermore, the water-reducing agent is a high-performance polycarboxylate water-reducing agent.

[0027] This invention also provides a method for preparing structurally integrated conductive concrete, the method comprising:

[0028] S1. Take 880-930 parts of conductive fly ash ceramsite and 720-760 parts of conductive fly ash ceramsite sand according to the mass ratio, soak them in water for 24 hours, and weigh them to determine the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite sand.

[0029] S2. Take 0.5 to 2 parts of carbon fiber and ultrasonically disperse it in 40 to 60 parts of water for 30 to 60 minutes to obtain ultrasonically dispersed carbon fiber mixture K, for later use.

[0030] S3. Take 200-220 parts of cement, 60-70 parts of low magnetic fly ash, 90-100 parts of mineral powder, 880-930 parts of pre-wetted conductive fly ash ceramsite, and 720-760 parts of pre-wetted conductive fly ash ceramsite sand, and mix them evenly to obtain dry material I.

[0031] S4. Take 4 to 6 parts of the water-reducing agent, pour it into the remaining water and stir evenly. Then add it to the dry material I and mix evenly to obtain slurry J.

[0032] S5. Add the ultrasonically dispersed carbon fiber mixture K to the slurry J and stir evenly to obtain a structurally and functionally integrated conductive concrete.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. The conductive fly ash ceramsite preparation method of the present invention produces conductive fly ash ceramsite with high compressive strength and good conductivity. Through reduction-magnetic separation-reduction sintering process, the weakly magnetic hematite is reduced to strongly magnetic magnetite by the residual carbon in the fly ash without the need for additional reducing agent. Magnetic separation will screen out high magnetic fly ash, and the high magnetic fly ash will be sintered in a reducing atmosphere to form elemental iron, thereby improving the conductivity of fly ash ceramsite.

[0035] In addition, substances such as Na2O and K2O in fly ash can act as fluxing agents during the sintering process, eliminating the need for additional fluxing agents.

[0036] 2. The low-magnetic fly ash generated during the preparation of conductive fly ash ceramsite and conductive fly ash ceramsite sand can be used in the preparation of conductive concrete, thus making full use of resources;

[0037] Low-magnetic fly ash removes most of the iron oxides, reduces the iron content, and increases the content of active silica and aluminum substances, thereby improving the pozzolanic activity of fly ash. When applied to concrete, it helps to improve the strength of concrete.

[0038] 3. This invention uses conductive fly ash ceramsite, which occupies a large volume of concrete, as a conductive material. Combined with a small amount of carbon fiber in the cement paste, it further improves the conductivity of concrete. The small amount of carbon fiber reduces the possibility of open circuits between ceramsite particles. The addition of a small amount of carbon fiber will not have a negative impact on the mechanical properties of concrete. Through the synergy between aggregate and paste, between metallic and non-metallic conductive materials, and between fiber materials and particulate materials, the conductivity of concrete is significantly improved.

[0039] 4. This invention uses a combination of ultrasonic dispersion and a dispersant to ensure that carbon fibers are uniformly dispersed in cement paste. The added polycarboxylate superplasticizer functions as a common superplasticizer and, being an anionic surfactant, also promotes the dispersion of carbon fibers.

[0040] 5. In the magnetic separation process of this invention, a magnetic rod with a magnetic induction intensity of 1T is first used for stirring to adsorb strongly magnetic substances, resulting in high adsorption efficiency; then, a magnetic rod with a magnetic induction intensity of 1.2T is used for stirring to adsorb weakly magnetic substances, thereby increasing the adsorption amount and adsorption effect. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0042] Example 1

[0043] A method for preparing conductive fly ash ceramsite, comprising:

[0044] S1. High-iron fly ash containing magnetite and hematite is placed in a roasting furnace and roasted at 800℃ for 30 minutes to obtain roasted fly ash A. Roasted fly ash A contains magnetite. The high-iron fly ash contains 14%–20% Fe2O3, 45%–54% SiO2, 25%–30% Al2O3, 0.5%–1% Na2O, 0.5%–1% K2O, 1%–4% CaO, 0.5%–3% MgO, and 4%–6% residual carbon.

[0045] In this stage, hematite undergoes a reduction reaction at high temperature, and the reaction process is as follows:

[0046] 2C + O2 = 2CO

[0047] 3Fe₂O₃ + CO = 2Fe₃O₄ + CO₂

[0048] S2. Disperse calcined fly ash A in water, with a mass ratio of calcined fly ash A to water of 1:9 to 1:4. In this embodiment, the mass ratio of calcined fly ash to water is 1:5, to obtain calcined fly ash solution B. Separate the magnetic material from calcined fly ash solution B to obtain wet high-magnetic fly ash C and low-magnetic fly ash solution D, wherein the main component of the magnetic material is Fe3O4.

[0049] More specifically, the process is as follows:

[0050] Step S21: Stir the calcined fly ash solution B with a magnetic rod with a magnetic induction intensity of 1T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod, and collect the magnetic material on the surface of the magnetic rod for later use; repeat the above process until the surface of the magnetic rod with a magnetic induction intensity of 1T no longer has magnetic material adsorbed.

[0051] Step S22: Stir the calcined fly ash solution B after the above step S21 by using a magnetic rod with a magnetic induction intensity of 1.2T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod with a magnetic induction intensity of 1.2T. Collect the magnetic material on the surface of the magnetic rod with a magnetic induction intensity of 1.2T for later use. Repeat the operation until the surface of the magnetic rod with a magnetic induction intensity of 1.2T no longer has magnetic material adsorbed.

[0052] Step S23: Mix the collected magnetic materials to obtain wet high-magnetic fly ash C, and process the calcined fly ash solution B through step S22 to obtain low-magnetic fly ash solution D.

[0053] S3. Dry the wet high-magnetic fly ash C to constant weight to obtain high-magnetic fly ash; dry the low-magnetic fly ash solution D to constant weight to obtain low-magnetic fly ash, wherein the Fe2O3 content in the high-magnetic fly ash is 45% to 60% and the Fe2O3 content in the low-magnetic fly ash is 2% to 6%.

[0054] During drying, the product is dried in an oven at a temperature of 60°C.

[0055] S4. Granulate high-magnetic fly ash to form fly ash ceramsite green pellets E. The specific operation is as follows:

[0056] During granulation, high-magnetic fly ash is placed on the disc of a disc pelletizing machine. Water is sprayed while the disc is rotated horizontally until the high-magnetic fly ash rolls into spherical shape on the disc. After drying, fly ash ceramsite green pellets E are obtained.

[0057] S5. Calcination of fly ash ceramsite pellets E under a reducing atmosphere includes three stages:

[0058] The first stage involves a preheating temperature of 400℃ and a preheating time of 30 minutes.

[0059] The second stage involves calcination at 1100℃ and sintering for 20 minutes.

[0060] The third stage involves rapid cooling for 15 minutes until the temperature drops to room temperature, which is typically 20–25°C, to obtain coarse conductive fly ash ceramsite F.

[0061] In the above process, magnetite is sintered under a reducing atmosphere to form elemental iron. The main reaction process is as follows:

[0062] Fe3O4 + 4CO = 3Fe + 4CO2

[0063] S6. The coarse conductive fly ash ceramsite F is sieved to obtain conductive fly ash ceramsite and conductive fly ash ceramsite sand, wherein the particle size of the conductive fly ash ceramsite is ≥5mm and ≤20mm, and the particle size of the conductive fly ash ceramsite sand is ≥1.25mm and <5mm.

[0064] More specifically, the apparent density of conductive fly ash ceramsite is 2200–2500 kg / m³. 3 The compressive strength of the cylinder is 8–12 MPa; the apparent density of the conductive fly ash ceramsite is 2350–2600 kg / m³. 3 The cylinder compressive strength is 9–12 MPa.

[0065] Example 2

[0066] A type of structurally and functionally integrated conductive concrete comprises, by weight: 215 parts cement, 62 parts low-magnetic fly ash, 93 parts mineral powder, 910 parts conductive fly ash ceramsite, 745 parts conductive fly ash ceramsite sand, 5 parts high-performance polycarboxylate superplasticizer, 1 part carbon fiber, and 165 parts water. The low-magnetic fly ash, conductive fly ash ceramsite, and conductive fly ash ceramsite sand are prepared by the method described in Example 1 above. The carbon fiber is polyacrylonitrile-based carbon fiber with a length of 5–8 mm, a diameter of 6–8 μm, and a density of 1.5–2 g / cm³. 3 It has a tensile strength of 4–8 GPa, a tensile modulus of 300–500 GPa, and a carbon content of >90%.

[0067] The preparation of the above-mentioned concrete includes the following steps:

[0068] S1. Take 910 parts of conductive fly ash ceramsite and 745 parts of conductive fly ash ceramsite according to the mass ratio, soak them in water for 24 hours, and weigh them to determine the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite.

[0069] S2. Take 1 part of carbon fiber and ultrasonically disperse it in 50 parts of water for 30 minutes to obtain ultrasonically dispersed carbon fiber mixture K, for later use.

[0070] S3. Take 215 parts of cement, 62 parts of low magnetic fly ash, 93 parts of mineral powder, 910 parts of pre-wetted conductive fly ash ceramsite and 745 parts of pre-wetted conductive fly ash ceramsite sand and mix them evenly under mechanical stirring to obtain dry material I.

[0071] S4. Subtract the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite sand and the 50 parts of water used for carbon fiber from 165 parts of water to obtain the remaining water. Take 5 parts of water-reducing agent, pour it into the remaining water and stir evenly. Then add it to dry material I and mix evenly to obtain slurry J.

[0072] S5. Add the ultrasonically dispersed carbon fiber mixture K to the slurry J and stir evenly to obtain a structurally and functionally integrated conductive concrete.

[0073] Comparative Example 1

[0074] A type of structurally and functionally integrated conductive concrete comprises, by weight parts: 215 parts cement, 62 parts low-magnetic fly ash, 93 parts mineral powder, 910 parts conductive fly ash ceramsite, 745 parts conductive fly ash ceramsite sand, 5 parts high-performance polycarboxylate superplasticizer, and 165 parts water. The low-magnetic fly ash, conductive fly ash ceramsite, and conductive fly ash ceramsite sand are prepared by the method described in Example 1 above.

[0075] The preparation of the above-mentioned concrete includes the following steps;

[0076] S1. Take 910 parts of conductive fly ash ceramsite and 745 parts of conductive fly ash ceramsite according to the mass ratio, soak them in water for 24 hours, and weigh them to determine the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite.

[0077] S2. Take 215 parts of cement, 62 parts of low magnetic fly ash, 93 parts of mineral powder, 910 parts of pre-wetted conductive fly ash ceramsite and 745 parts of pre-wetted conductive fly ash ceramsite sand and mix them evenly under mechanical stirring to obtain dry material I.

[0078] S3. Subtract the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite from 165 parts of water to obtain the remaining water. Take 5 parts of water-reducing agent, pour it into the remaining water and stir evenly. Then add it to dry material I and mix evenly to obtain structural and functional integrated conductive concrete.

[0079] Comparative Example 2

[0080] A type of structurally and functionally integrated conductive concrete comprises, by weight: 215 parts cement, 62 parts low-magnetic fly ash, 93 parts mineral powder, 1020 parts ordinary coarse aggregate, 800 parts ordinary fine aggregate, 1 part carbon fiber, 5 parts high-performance polycarboxylate superplasticizer, and 165 parts water. The low-magnetic fly ash is prepared by the method described in Example 1 above. The carbon fiber is polyacrylonitrile-based carbon fiber with a length of 5–8 mm, a diameter of 6–8 μm, and a density of 1.5–2 g / cm³. 3 It has a tensile strength of 4–8 GPa, a tensile modulus of 300–500 GPa, and a carbon content >90%. Common coarse aggregates include crushed stone and pebbles, while common fine aggregates include river sand.

[0081] The preparation of the above-mentioned concrete includes the following steps:

[0082] S1. Take 1 part of carbon fiber according to the mass ratio and ultrasonically disperse it in 50 parts of water for 30 minutes to obtain ultrasonically dispersed carbon fiber mixture K, for later use.

[0083] S2. Take 215 parts of cement, 62 parts of low magnetic fly ash, 93 parts of mineral powder, 1020 parts of ordinary coarse aggregate, and 800 parts of ordinary fine aggregate and mix them evenly under mechanical stirring to obtain dry material I.

[0084] S3. Take 5 parts of water-reducing agent, pour it into the remaining 115 parts of water and stir evenly. Then add it to dry material I and mix evenly to obtain slurry J.

[0085] S4. Add the ultrasonically dispersed carbon fiber mixture K to the slurry J and stir evenly to obtain a structurally and functionally integrated conductive concrete.

[0086] Comparative Example 3

[0087] A type of structurally and functionally integrated conductive concrete comprises, by weight: 215 parts cement, 62 parts low-magnetic fly ash, 93 parts mineral powder, 1020 parts ordinary coarse aggregate, 800 parts ordinary fine aggregate, 5 parts high-performance polycarboxylate superplasticizer, 2.5 parts carbon fiber, and 165 parts water. The low-magnetic fly ash is prepared by the method described in Example 1 above. The carbon fiber is polyacrylonitrile-based carbon fiber with a length of 5–8 mm, a diameter of 6–8 μm, and a density of 1.5–2 g / cm³. 3 It has a tensile strength of 4–8 GPa, a tensile modulus of 300–500 GPa, and a carbon content >90%. Common coarse aggregates include crushed stone and pebbles, while common fine aggregates include river sand.

[0088] The preparation of the above-mentioned concrete includes the following steps:

[0089] S1. Take 2.5 parts of carbon fiber according to the mass ratio and ultrasonically disperse it in 50 parts of water for 30 minutes to obtain ultrasonically dispersed carbon fiber mixture K, for later use.

[0090] S2. Take 215 parts of cement, 62 parts of low magnetic fly ash, 93 parts of mineral powder, 1020 parts of ordinary coarse aggregate, and 800 parts of ordinary fine aggregate and mix them evenly under mechanical stirring to obtain dry material I.

[0091] S3. Take 5 parts of water-reducing agent, pour it into the remaining 115 parts of water and stir evenly. Then add it to dry material I and mix evenly to obtain slurry J.

[0092] S4. Add the ultrasonically dispersed carbon fiber mixture K to the slurry J and stir evenly to obtain a structurally and functionally integrated conductive concrete.

[0093] Test method:

[0094] The compressive strength and electrical conductivity of the concrete from Example 2 and Comparative Examples 1-3 were tested, and the results are shown in the table below:

[0095] Testing items Compressive strength (MPa) Electrical conductivity (S / m) Example 2 40.7 0.01 Comparative Example 1 41.6 0.005 Comparative Example 2 36.2 0.003 Comparative Example 3 34.8 0.003

[0096] The table above shows that the compressive strength and electrical conductivity of the structurally functional conductive concrete prepared in Example 2 are significantly better than those in Comparative Examples 1-3.

[0097] The performance difference between Example 2 and Comparative Example 1 shows that with the addition of conductive ceramsite, only a small amount of carbon fiber can significantly improve the conductivity of concrete.

[0098] The performance difference between Example 2 and Comparative Example 2 shows that after adding conductive ceramsite, the concrete forms a complete conductive network, thus exhibiting excellent conductivity. Furthermore, the addition of conductive ceramsite as aggregate does not reduce the compressive strength of the concrete.

[0099] The performance differences between Comparative Example 2 and Comparative Example 3 show that if ordinary aggregate is added instead of conductive ceramsite, the concrete cannot form a complete conductive network, and even increasing the amount of carbon fiber cannot achieve a good conductive effect.

[0100] It should be noted that the letters in calcined fly ash A, calcined fly ash solution B, wet high magnetic fly ash C, low magnetic fly ash solution D, fly ash ceramsite pellets E, coarse conductive fly ash ceramsite F, dry material I, slurry J, and ultrasonically dispersed carbon fiber mixture K in this application have no special limiting meaning and are only used to distinguish substances and materials.

[0101] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A type of structurally and functionally integrated conductive concrete, characterized in that, The components, by weight ratio, are: 200-220 parts cement, 60-70 parts low-magnetic fly ash, 90-100 parts mineral powder, 880-930 parts conductive fly ash ceramsite, 720-760 parts conductive fly ash ceramsite sand, 0.5-2 parts carbon fiber, 4-6 parts water-reducing agent, and 165-170 parts water. The low-magnetic fly ash, conductive fly ash ceramsite, and conductive fly ash ceramsite sand are prepared by the following method, which includes: S1. High-iron fly ash containing magnetite and hematite is placed in a roasting furnace, wherein the high-iron fly ash contains... The content is 14%~20%. The content is 45%~54%. The content is 25%~30%. The content is 0.5%~1%. The content of MgO is 0.5%~1%, the content of CaO is 1%~4%, the content of MgO is 0.5%~3%, and the content of residual carbon is 4%~6%. Roasted fly ash A is obtained by roasting at 800℃ for 30 minutes. Roasted fly ash A contains magnetite. S2. Disperse calcined fly ash A in water to obtain calcined fly ash solution B. Separate the magnetic substances from calcined fly ash solution B to obtain wet high-magnetic fly ash C and low-magnetic fly ash solution D. S3. Dry the wet high-magnetic fly ash C to constant weight to obtain high-magnetic fly ash, wherein the high-magnetic fly ash contains... The content is 45%~60%; the low magnetic fly ash solution D is dried to constant weight to obtain low magnetic fly ash, wherein the low magnetic fly ash contains... The content is 2%~6%; S4. Granulate high magnetic fly ash to form fly ash ceramsite pellets E; S5. Calcination of fly ash ceramsite pellets E under a reducing atmosphere includes three stages: The first stage involves a preheating temperature of 400℃ and a preheating time of 30 minutes. The second stage involves calcination at 1100℃ and sintering for 20 minutes. In the third stage, rapid cooling for 15 minutes was performed until the temperature dropped to room temperature, yielding coarse conductive fly ash ceramsite F. S6. The coarse conductive fly ash ceramsite F is sieved to obtain conductive fly ash ceramsite and conductive fly ash ceramsite sand, wherein the particle size of the conductive fly ash ceramsite is ≥5mm and ≤20mm, and the particle size of the conductive fly ash ceramsite sand is ≥1.25mm and <5mm.

2. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, The mass ratio of the roasted fly ash A to water is 1:9 to 1:

4.

3. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, The apparent density of the conductive fly ash ceramsite is 2200~2500 kg / m³, and the compressive strength is 8~12 MPa.

4. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, The apparent density of the conductive fly ash ceramic sand is 2350~2600 kg / m³, and the compressive strength is 9~12 MPa.

5. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, Step S2 includes: Step S21: Stir the calcined fly ash solution B with a magnetic rod with a magnetic induction intensity of 1T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod, and collect the magnetic material on the surface of the magnetic rod for later use; repeat the above process until the surface of the magnetic rod with a magnetic induction intensity of 1T no longer has magnetic material adsorbed. Step S22: Stir the calcined fly ash solution B after the above step S21 by using a magnetic rod with a magnetic induction intensity of 1.2T, so that the magnetic material in the calcined fly ash solution B is adsorbed on the surface of the magnetic rod with a magnetic induction intensity of 1.2T. Collect the magnetic material on the surface of the magnetic rod with a magnetic induction intensity of 1.2T for later use. Repeat the operation until the surface of the magnetic rod with a magnetic induction intensity of 1.2T no longer has magnetic material adsorbed. Step S23: Mix the collected magnetic materials to obtain wet high-magnetic fly ash C, and process the calcined fly ash solution B through step S22 to obtain low-magnetic fly ash solution D.

6. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, The carbon fiber is polyacrylonitrile-based carbon fiber, with a length of 5~8mm, a diameter of 6~8μm, a density of 1.5~2g / cm³, a tensile strength of 4~8GPa, a tensile modulus of 300~500GPa, and a carbon content of >90%.

7. The structurally and functionally integrated conductive concrete according to claim 1, characterized in that, The water-reducing agent is a high-performance polycarboxylate water-reducing agent.

8. A method for preparing structurally integrated conductive concrete as described in claim 1, characterized in that, The method includes: S1. Take 880-930 parts of conductive fly ash ceramsite and 720-760 parts of conductive fly ash ceramsite sand according to the mass ratio, soak them in water for 24 hours, and weigh them to determine the water absorption of conductive fly ash ceramsite and conductive fly ash ceramsite sand. S2. Take 0.5 to 2 parts of carbon fiber and ultrasonically disperse it in 40 to 60 parts of water for 30 to 60 minutes to obtain ultrasonically dispersed carbon fiber mixture K, for later use. S3. Take 200-220 parts of cement, 60-70 parts of low magnetic fly ash, 90-100 parts of mineral powder, 880-930 parts of pre-wetted conductive fly ash ceramsite, and 720-760 parts of pre-wetted conductive fly ash ceramsite sand, and mix them evenly to obtain dry material I. S4. Take 4-6 parts of water-reducing agent, pour it into the remaining water and stir evenly. Then add it to dry material I and mix evenly to obtain slurry J. S5. Add the ultrasonically dispersed carbon fiber mixture K to the slurry J and stir evenly to obtain a structurally and functionally integrated conductive concrete.