A force-electricity conversion digital aggregate, its preparation method and application

Abstract

The present invention belongs to the technical field of intelligent building materials, and particularly relates to a force-electricity conversion digital aggregate and its preparation method and application. The radio frequency components in the force-electricity conversion digital aggregate provided by the present invention, in addition to effectively storing information and identifying the identity of concrete products and receiving and transmitting radio frequency signals, can also receive and transmit the electrical signals converted from pressure by the force-electricity conversion material for mechanical monitoring. Under the action of the modifier and the reinforcing agent, the digital aggregate has excellent force-electricity conversion characteristics and mechanical properties, and the mineralization products formed by the carbon mineralization material through the mineralization reaction are close to the composition of natural stone. Therefore, the force-electricity conversion digital aggregate provided by the present invention has high mechanical monitoring efficiency, good compatibility with the concrete structure and a long service life; at the same time, the force-electricity conversion digital aggregate provided by the present invention can directly convert external stress signals into electrical signals without the need to provide an additional power source for data acquisition.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent building materials, and specifically relates to a force-electricity conversion digital aggregate and a preparation method and application thereof. Background Art

[0002] Cement concrete is the most widely used building material in the world. The construction of houses, roads and bridges, and transportation infrastructure cannot be separated from cement concrete. These concrete structures or components need to be force-monitored during their service, and traffic roads also need to monitor traffic information such as vehicle weight, traffic flow, and vehicle speed. The traditional method is to arrange pressure sensors in concrete structures to monitor information such as mechanics, vehicle weight, and traffic flow. However, these sensors are generally large in size, and when installed on the surface of the structure or embedded in the structure, they have poor compatibility with the structure, and an additional external power supply is required to meet the sensor data collection requirements. This results in problems such as high sensor failure rate and complex equipment installation in actual use.

[0003] On the other hand, the production and preparation process of these cement concrete structures or components is complex and the degree of informatization is low. When quality problems occur during service, it is usually difficult to trace the source. Some people use QR codes to store concrete product information and paste the QR codes on the surface of structures or components to mark concrete. However, QR codes have poor weather resistance and are easily contaminated, worn, and fallen off when used on the surface of structures. There are even problems of human damage, which reduces the service life of QR codes. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a mechanoelectric conversion digital aggregate and a preparation method and application thereof. The mechanoelectric conversion digital aggregate provided by the present invention has high mechanical monitoring efficiency, good compatibility with concrete structures, and long service life.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a mechanoelectric conversion digital aggregate, the raw materials of which include carbon mineralization material, mechanoelectric conversion material, radio frequency component, modifier, reinforcing agent and water;

[0007] The electromechanical conversion material includes one or more of lead zirconate titanate powder, lead magnesium niobate powder, bismuth titanate powder and barium titanate powder;

[0008] The radio frequency component consists of a radio frequency chip and a radio frequency antenna.

[0009] Preferably, the particle size of the electromechanical conversion material is less than 100 μm.

[0010] Preferably, the carbon mineralization material includes one or more of tricalcium silicate, γ-dicalcium silicate, β-dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide; the particle size of the carbon mineralization material is < 150 μm.

[0011] Preferably, the modifier is a nano-carbon material; the particle size of the modifier is < 50 nm.

[0012] Preferably, the reinforcing agent includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol.

[0013] Preferably, the mass ratio of the carbon mineralization material to the piezoelectric conversion material is (8 - 36):(15.6 - 64.8).

[0014] The present invention also provides a method for preparing the piezoelectric conversion digital aggregate according to the above technical solution, comprising the following steps:

[0015] Mix the carbon mineralization material, piezoelectric conversion material, modifier, reinforcing agent, and water to obtain a mixture, and place the mixture and the RF component in a mold for pressing to form an aggregate blank;

[0016] Mineralize the aggregate blank in a carbon dioxide atmosphere to obtain a mineralized aggregate;

[0017] Polarize the mineralized aggregate to obtain a piezoelectric conversion digital aggregate.

[0018] Preferably, the pressure for pressing is 10 - 60 MPa.

[0019] Preferably, the partial pressure of carbon dioxide in the mineralization is 0.1 - 0.3 MPa, the volume concentration of carbon dioxide is 20 - 99.9%; the temperature of the mineralization is 5 - 90 °C; the time of the mineralization is 12 - 48 h.

[0020] The present invention also provides the application of the piezoelectric conversion digital aggregate according to the above technical solution or the piezoelectric conversion digital aggregate prepared by the above technical solution preparation method in mechanical monitoring and quality traceability of cement concrete structures and in traffic information monitoring of roads.

[0021] The present invention provides a piezoelectric conversion digital aggregate, the raw materials of which include a carbon mineralization material, a piezoelectric conversion material, an RF component, a modifier, a reinforcing agent, and water; the piezoelectric conversion material includes one or more of lead zirconate titanate powder, lead magnesium niobate powder, bismuth titanate powder, and barium titanate powder; the RF component is composed of an RF chip and an RF antenna.

[0022] The radio frequency components in the force - electricity conversion digital aggregate provided by the present invention, in addition to effectively storing information and identifying the identity of concrete products, receiving and transmitting radio frequency signals, can also receive and transmit the electrical signals converted from pressure by the force - electricity conversion material for mechanical monitoring. Under the action of the modifier and the reinforcing agent, the digital aggregate has excellent force - electricity conversion characteristics and mechanical properties, and the mineralization products formed by the carbon mineralization material through the mineralization reaction are close to the composition of natural stone. Therefore, the force - electricity conversion digital aggregate provided by the present invention has high mechanical monitoring efficiency, good compatibility with the concrete structure, and a long service life. At the same time, the force - electricity conversion digital aggregate provided by the present invention can directly convert external stress signals into electrical signals without the need to provide an additional power source for data acquisition. In addition, the radio frequency components in the force - electricity conversion digital aggregate can uniquely identify and store information about the concrete structure or component, thus avoiding durability problems such as easy contamination, wear, and shedding of two - dimensional codes. The technical principle of the present invention is simple and the effect is obvious. It can accurately monitor information such as the stress, vehicle weight, traffic flow, and vehicle speed of cement concrete structures such as roads and bridges, and identify and trace these structures, significantly improving the quality management level. Detailed implementation mode

[0023] The present invention provides a force - electricity conversion digital aggregate, and the raw materials include a carbon mineralization material, a force - electricity conversion material, a radio frequency component, a modifier, a reinforcing agent, and water.

[0024] The force - electricity conversion material includes one or more of lead zirconate titanate powder, lead magnesium niobate powder, bismuth titanate powder, and barium titanate powder.

[0025] The radio frequency component is composed of a radio frequency chip and a radio frequency antenna.

[0026] Unless otherwise specified, the present invention has no special requirements for the sources of the raw materials used, and commercially available products well - known to those skilled in the art can be used.

[0027] The raw materials of the force - electricity conversion digital aggregate provided by the present invention include a carbon mineralization material. In the present invention, the carbon mineralization material preferably includes one or more of tricalcium silicate, γ - type dicalcium silicate, β - type dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide, and more preferably γ - type dicalcium silicate; the particle size of the carbon mineralization material is preferably < 150μm, and more preferably < 100μm. When the carbon mineralization material is several of the above, the present invention has no special limitation on the ratio of different types of carbon mineralization materials, and any ratio can be used. The mineralization products formed by the carbon mineralization material through the mineralization reaction in the present invention are close to the composition of natural stone, have good compatibility with the concrete structure, have good mechanical properties, and a long service life.

[0028] The raw materials of the force-electricity conversion digital aggregate provided by the present invention include force-electricity conversion materials. In the present invention, the force-electricity conversion materials include one or more of lead zirconate titanate powder, lead magnesium niobate powder, bismuth titanate powder, and barium titanate powder, preferably lead zirconate titanate powder; the particle size of the force-electricity conversion materials is preferably <100 μm, more preferably <80 μm. When the force-electricity conversion materials are several of the above, the present invention has no special limitation on the ratio of different types of force-electricity conversion materials, and any ratio is acceptable. The force-electricity conversion materials used in the present invention can directly convert external stress signals into electrical signals, so as to monitor the stress condition of the force-electricity conversion digital aggregate without the need to provide an additional power source for data acquisition.

[0029] In the present invention, the mass ratio of the carbon mineralization material to the force-electricity conversion material is preferably (8-36):(15.6-64.8), more preferably (15-30):(25-60).

[0030] The raw materials of the force-electricity conversion digital aggregate provided by the present invention include radio frequency components. In the present invention, the radio frequency components include a radio frequency chip and a radio frequency antenna; the radio frequency chip and the radio frequency antenna are commercially available products; the operation of the radio frequency components is preferably: the radio frequency chip is connected to the radio frequency antenna, and under the excitation of the signal collector, the internal information of the radio frequency chip can be sent by the radio frequency antenna and received by the signal collector; the operating frequency of the signal collector preferably includes low frequencies of 30-300 kHz, high frequencies of 3-30 MHz, and ultra-high frequencies of 433-950 MHz, more preferably ultra-high frequencies of 433-950 MHz. In addition to effectively storing information and identifying the identity of concrete products, receiving and transmitting radio frequency signals, the radio frequency components used in the present invention can also receive and transmit the electrical signals converted from pressure by the force-electricity conversion materials for mechanical monitoring. Moreover, by placing the radio frequency components in the force-electricity conversion digital aggregate, durability problems such as easy contamination, easy abrasion, and easy detachment of two-dimensional codes are avoided, and the service life is long.

[0031] The raw materials of the force-electricity conversion digital aggregate provided by the present invention include modifiers. In the present invention, the modifier is preferably a nano-carbon material; the nano-carbon material preferably includes one or more of nano-carbon black, carbon nanotubes, nano-carbon fibers, and nano-graphene sheets, more preferably nano-carbon black; the particle size of the modifier is preferably <50 nm, more preferably <40 nm. When the modifier is several of the above, the present invention has no special limitation on the ratio of different types of modifiers, and any ratio is acceptable. The modifier used in the present invention is uniformly dispersed in the force-electricity conversion digital aggregate, which can improve the conductivity of the digital aggregate, promote the polarization of the force-electricity conversion materials inside it, increase the degree of polarization, and thus improve the force-electricity conversion performance of the digital aggregate; at the same time, the modifier can fill the pores of the digital aggregate, increase the density of the digital aggregate, reduce the attenuation of electromagnetic wave signals, and thus improve the compressive strength and sensitivity of the digital aggregate.

[0032] In the present invention, the mass ratio of the carbon mineralization material to the modifier is preferably (8 - 36):(1.2 - 10.2), more preferably (15 - 30):(2 - 8).

[0033] The raw materials of the piezoelectric - conversion digital aggregate provided by the present invention include a reinforcing agent. In the present invention, the reinforcing agent preferably includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol, and more preferably sodium alginate. When the reinforcing agent is several of the above, the present invention has no special limitation on the ratio of different types of reinforcing agents, and any ratio is acceptable. The reinforcing agent used in the present invention can induce the formation of more carbonate minerals in the mineralization reaction, improve the density of the digital aggregate, and thus improve the mechanical strength and sensitivity of the digital aggregate.

[0034] In the present invention, the mass ratio of the carbon mineralization material to the reinforcing agent is preferably (8 - 36):(0.2 - 2.4), more preferably (15 - 30):(0.5 - 2).

[0035] The raw materials of the piezoelectric - conversion digital aggregate provided by the present invention include water. In the present invention, the mass ratio of the carbon mineralization material to water is preferably (8 - 36):(3.6 - 15.2), more preferably (15 - 30):(5 - 10).

[0036] The present invention also provides a method for preparing the piezoelectric - conversion digital aggregate according to the above - mentioned technical solution, comprising the following steps:

[0037] Placing the mixture obtained by mixing the carbon mineralization material, the piezoelectric - conversion material, the modifier, the reinforcing agent, and water together with the radio - frequency component in a mold for compression molding to obtain an aggregate blank;

[0038] Subjecting the aggregate blank to mineralization in a carbon dioxide atmosphere to obtain a mineralized aggregate;

[0039] Polarizing the mineralized aggregate to obtain the piezoelectric - conversion digital aggregate.

[0040] The present invention places the mixture obtained by mixing the carbon mineralization material, the piezoelectric - conversion material, the modifier, the reinforcing agent, and water together with the radio - frequency component in a mold for compression molding to obtain an aggregate blank.

[0041] In the present invention, the mixing of the carbon mineralization material, the piezoelectric - conversion material, the modifier, the reinforcing agent, and water is preferably as follows: first mixing the reinforcing agent and water to obtain a mixed solution; then second - mixing the carbon mineralization material, the piezoelectric - conversion material, the modifier, and the mixed solution to obtain a mixture. The present invention has no special limitation on the processes of the first mixing and the second mixing, and the materials can be mixed evenly by using the well - known mixing processes in the art.

[0042] In the present invention, preferably, the mixture is filled to the half-height position of the mold, then the radio frequency component is placed at the center of the mold, and then the mold is filled with the mixture. The present invention has no special limitation on the shape of the mold. The mold can be a regular shape (such as a cylinder, a cube, a strip), or an irregular shape. It is only necessary to customize the corresponding shape mold according to actual needs.

[0043] In the present invention, the pressure for compression molding is preferably 10 - 60 MPa, more preferably 20 - 40 MPa; the time for compression molding is preferably 0.5 - 3 min, more preferably 1 - 2 min.

[0044] After obtaining the aggregate green body, the present invention mineralizes the aggregate green body in a carbon dioxide atmosphere to obtain mineralized aggregate.

[0045] In the present invention, the partial pressure of carbon dioxide in the mineralization is preferably 0.1 - 0.3 MPa, more preferably 0.2 - 0.3 MPa, the volume concentration of carbon dioxide is preferably 20 - 99.9%, more preferably 50 - 99.9%; the relative humidity of the carbon dioxide atmosphere is preferably 50%; the temperature of the mineralization is preferably 5 - 90 °C, more preferably 20 - 40 °C; the time of the mineralization is preferably 12 - 48 h, more preferably 24 - 48 h.

[0046] During the mineralization process, the carbon mineralization material reacts with carbon dioxide to form a mineralized product mainly composed of carbonate minerals, which is similar in composition to natural stone, so it has better compatibility with concrete; at the same time, the carbonate mineral has a large impedance and less attenuation of electromagnetic wave transmission.

[0047] After obtaining the mineralized aggregate, the present invention polarizes the mineralized aggregate to obtain a force-electricity conversion digital aggregate.

[0048] In the present invention, the polarization voltage for polarization is preferably 1 - 6 kV / mm, more preferably 2 - 4 kV / mm, the polarization temperature is preferably 20 - 120 °C, more preferably 25 - 60 °C, and the polarization duration is preferably 5 - 60 min, more preferably 10 - 30 min.

[0049] Under the action of the polarization voltage, the electric domains in the force-electricity conversion material in the digital aggregate deflect along the electric field direction and finally tend to be consistent, endowing the digital aggregate with force-electricity conversion characteristics.

[0050] The present invention also provides the application of the force-electricity conversion digital aggregate described in the above technical solution or the force-electricity conversion digital aggregate prepared by the preparation method described in the above technical solution in mechanical monitoring and quality traceability of cement concrete structures and in traffic information monitoring of roads.

[0051] The present invention does not particularly limit the application method of the force-electricity conversion digital aggregate, and the well-known application methods in the art can be adopted.

[0052] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention, but they should not be construed as limiting the protection scope of the present invention.

[0053] Example 1

[0054] The carbon mineralization material is dicalcium silicate of γ type, with a particle size < 150 μm, the force-electricity conversion material is lead zirconate titanate powder, with a particle size < 100 μm, the modifier is nano carbon black, with a particle size < 50 nm, and the reinforcing agent is sodium alginate;

[0055] By mass, take 18 parts of dicalcium silicate of γ type, 32.8 parts of lead zirconate titanate powder, 2.4 parts of nano carbon black, 0.8 part of sodium alginate, and 6.5 parts of water; disperse sodium alginate in water and stir evenly to form a mixed solution; evenly mix dicalcium silicate of γ type, lead zirconate titanate powder, nano carbon black with the mixed solution to form a mixed material; fill the mixed material into a cylindrical mold with a bottom diameter of 20 mm to the half-height position, and place 1 part of the radio frequency component in the center of the mold, then continue to fill the mixed material until it is full, and prepare the aggregate blank by pressing, the pressing pressure is 30 MPa, and the pressing time is 2 min; repeat the above steps to prepare 3 aggregate blanks; place the aggregate blanks in a carbon dioxide atmosphere for mineralization, the volume concentration of carbon dioxide is 99.9%, the partial pressure of carbon dioxide is 0.2 MPa, the mineralization temperature is 25 °C, the relative humidity is 50%, and the mineralization duration is 24 h to obtain the mineralized aggregate; polarize the mineralized aggregate, the polarization voltage is 4 kV / mm, the polarization temperature is 25 °C, and the polarization duration is 20 min to obtain the force-electricity conversion digital aggregate.

[0056] Example 2

[0057] The difference from Example 1 is only that the force-electricity conversion material is 45.6 parts of lead zirconate titanate powder and 8.6 parts of water, and the others are the same as in Example 1.

[0058] Example 3

[0059] The difference from Example 1 is only that the force-electricity conversion material is 58.4 parts of lead zirconate titanate powder and 10.8 parts of water, and the others are the same as in Example 1.

[0060] Example 4

[0061] The difference from Example 1 is only that the modifier is 3.6 parts of nano carbon black, and the others are the same as in Example 1.

[0062] Example 5

[0063] The difference from Example 1 is only that the modifier is 4.8 parts of nano carbon black, and the others are the same as in Example 1.

[0064] Example 6

[0065] The difference from Example 1 is only that the reinforcing agent is 1.2 parts of sodium alginate, and the others are the same as in Example 1.

[0066] Example 7

[0067] The difference from Example 1 is only that the reinforcing agent is 1.6 parts of sodium alginate, and the others are the same as in Example 1.

[0068] Comparative Example 1

[0069] By mass, take 18 parts of ordinary Portland cement, 32.8 parts of lead zirconate titanate powder, and 6.5 parts of water. Mix the ordinary Portland cement, lead zirconate titanate powder and water evenly to form a mixture; fill the mixture into a square mold with a bottom surface of 20 mm×20 mm to half the height position, and place 1 part of the radio frequency component at the center of the mold, and continue to fill the mixture until it is full; place the mixture with the radio frequency component in a standard curing room at a temperature of 25°C and a relative humidity of 90% for 28 d to obtain the force-electricity conversion digital aggregate prepared with ordinary Portland cement.

[0070] Comparative Example 2

[0071] The difference from Comparative Example 1 is only that the cement for preparing the force-electricity conversion digital aggregate is white Portland cement, and the others are the same as in Comparative Example 1

[0072] Performance Test

[0073] Test the force-electricity conversion characteristics, compressive strength and sensitivity of the force-electricity conversion digital aggregates prepared in Examples 1 to 7 and Comparative Examples 1 to 2. The compressive strength is tested with reference to the national standard "GB / T 50081-2002 Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The force-electricity conversion characteristics of the digital aggregate can be represented by the magnitude of its d 33 value, which can be tested by a d 33 measuring instrument. At the same time, use a signal collector to read the internal information of the force-electricity conversion digital aggregate. The working frequency of the signal collector is 433-950 MHz ultra-high frequency, and record the sensitivity of the signal collector. The test results of the digital aggregates prepared in each example and comparative example are shown in Table 1.

[0074] Table 1 Results of Force-Electricity Conversion Characteristics, Compressive Strength and Sensitivity of Digital Aggregates

[0075]

[0076] In Table 1, d 33The ability of the force-electricity conversion digital aggregate to convert stress signals into electrical signals, d 33 The larger it is, the better the force-electricity conversion performance; the sensitivity is the minimum power required for the signal collector to obtain the data information inside the force-electricity conversion digital aggregate. The smaller its value, the higher the sensitivity.

[0077] As can be seen from Table 1, the force-electricity conversion characteristics of the digital aggregates prepared in each example are significantly better than those of Comparative Examples 1 and 2. This is because the modifier added in the present invention can improve the conductivity of the digital aggregate, promote the polarization of the force-electricity conversion material inside it, increase the degree of polarization, and thus improve the force-electricity conversion performance of the digital aggregate; compared with Comparative Examples 1 and 2, the compressive strength of the digital aggregates prepared in each example is higher than that of the comparative examples. This is because Comparative Examples 1 and 2 form strength through the hydration of cement, resulting in a high porosity of the matrix and thus a low compressive strength; while in each example of the present invention, strength is formed through the carbonation of the carbonation material, and the matrix has a low porosity, so the compressive strength is high; at the same time, the sensitivity of the digital aggregates prepared in each example is much higher than that of Comparative Examples 1 and 2. This is because there are many types of silicate minerals produced by cement hydration, with small impedance and large attenuation of electromagnetic wave signal transmission, resulting in a decrease in sensitivity; while the products produced by the carbonation of the carbonation material used in the present invention have a single phase, large impedance, and small attenuation of electromagnetic wave signal transmission, so the sensitivity is high.

[0078] It can be seen from Examples 1 to 3 that increasing the amount of the force-electricity conversion material used can significantly improve the force-electricity conversion performance of the force-electricity conversion digital aggregate, but at the same time, the compressive strength decreases significantly and the sensitivity also decreases. This is because the force-electricity conversion material has no mineralization reaction activity, a large density, and has a certain attenuation effect on electromagnetic wave signals, resulting in a decrease in the compressive strength and sensitivity of the force-electricity conversion digital aggregate.

[0079] Compared with Example 1, Examples 4 and 5 use a modifier to modify the force-electricity conversion digital aggregate. As the amount of the modifier increases, the force-electricity conversion performance of the digital aggregate improves, and at the same time, the compressive strength and sensitivity also increase. This is because the modifier can improve the conductivity of the digital aggregate, promote the polarization of the force-electricity conversion material inside it, increase the degree of polarization, and thus improve the force-electricity conversion performance of the digital aggregate; at the same time, the modifier can fill the pores of the digital aggregate, increase the density of the digital aggregate, and reduce the attenuation of electromagnetic wave signals, thereby improving the compressive strength and sensitivity of the digital aggregate.

[0080] Both Example 1 and Examples 6 and 7 add a reinforcing agent, and as the amount of the reinforcing agent used increases, the compressive strength of the digital aggregate increases significantly, and at the same time, the sensitivity also increases. This is because the reinforcing agent can induce the formation of more carbonate minerals in the mineralization reaction, improve the density of the digital aggregate, and thus improve the mechanical strength and sensitivity of the digital aggregate. In addition, increasing the amount of the reinforcing agent used has little effect on the force-electricity conversion performance of the digital aggregate.

[0081] Although the above embodiments have described the present invention in detail, they are only a part rather than all of the embodiments of the present invention. People can also obtain other embodiments based on this embodiment without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A force-electricity conversion digital aggregate, characterized in that The raw materials include a carbon mineralization material, a mechanical-electric conversion material, a radio frequency component, a modifier, a reinforcing agent, and water; The mechanical-electric conversion material includes one or more of lead zirconate titanate powder, lead magnesium niobate powder, bismuth titanate powder, and barium titanate powder; The radio frequency component includes a radio frequency chip and a radio frequency antenna; The carbon mineralization material includes one or more of tricalcium silicate, γ-dicalcium silicate, β-dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide; The modifier is a nano-carbon material; The reinforcing agent includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol.

2. The force-electricity conversion digital aggregate according to claim 1, wherein The particle size of the mechanical-electric conversion material < 100 µm.

3. The electro-mechanical conversion digital aggregate according to claim 1, characterized in that, The particle size of the carbon mineralization material < 150 µm.

4. The electro-mechanical conversion digital aggregate according to claim 1, wherein The particle size of the modifier < 50 nm.

5. The piezoelectric digital aggregate according to any one of claims 1 to 4, characterized in that, The mass ratio of the carbon mineralization material to the mechanical-electric conversion material is (8 - 36):(15.6 - 64.8).

6. The preparation method of the force-electricity conversion digital aggregate according to any one of claims 1 to 5, characterized in that, It includes the following steps: Placing the mixture obtained by mixing the carbon mineralization material, the mechanical-electric conversion material, the modifier, the reinforcing agent, and water and the radio frequency component in a mold for pressing and forming to obtain an aggregate green body; Mineralizing the aggregate green body in a carbon dioxide atmosphere to obtain a mineralized aggregate; Polarizing the mineralized aggregate to obtain a mechanical-electric conversion digital aggregate.

7. The preparation method according to claim 6, characterized in that, The pressure for the pressing and forming is 10 - 60 MPa.

8. The preparation method according to claim 6, characterized in that, In the mineralization, the partial pressure of carbon dioxide is 0.1 - 0.3 MPa, the volume concentration of carbon dioxide is 20 - 99.9%; the temperature of the mineralization is 5 - 90 °C; the time of the mineralization is 12 - 48 h.

9. The application of the mechanical-electric conversion digital aggregate according to any one of claims 1 - 5 or the mechanical-electric conversion digital aggregate prepared by the preparation method according to any one of claims 6 - 8 in mechanical monitoring and quality traceability of cement concrete structures and in traffic information monitoring of roads.

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