A passive wireless temperature-sensing 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 passive wireless temperature-sensing digital aggregate, a preparation method thereof, and an application thereof. The passive wireless temperature-sensing digital aggregate provided by the present invention does not require an additional power supply and a data transmission line. The internal temperature-sensing radio frequency component thereof can collect and transmit temperature data in a passive wireless manner, and can also use it as a globally unique ID number to effectively store information and identify the identity of concrete products for traceability. The heat-conducting agent is uniformly dispersed in the temperature-sensing digital aggregate, which can increase the heat conduction coefficient of the temperature-sensing digital aggregate, and the ambient temperature is more easily diffused into the temperature-sensing digital aggregate and monitored by the internal temperature-sensing radio frequency chip thereof, thereby improving the temperature collection accuracy and sensitivity thereof. The passive wireless temperature-sensing digital aggregate provided by the present invention has high temperature collection accuracy and sensitivity, high mechanical strength, and a long service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent building materials, and particularly relates to a passive wireless temperature-sensing digital aggregate, a preparation method thereof, and an application thereof. Background Art

[0002] During the use of concrete electric products, it is necessary to continuously monitor the temperature to ensure the safe operation of electric equipment. In addition, there is also a need for temperature monitoring during the service process of concrete precast components or cast-in-place structures such as building walls, roads, and bridges. Traditional temperature monitoring measures collect temperature data of the structure by using temperature sensors. However, the temperature sensor components are easily damaged and it is difficult to have the same service life as the structure. Moreover, additional external power supplies and transmission lines are required to meet the data collection and transmission requirements of the temperature sensors. This causes problems such as high failure rates of temperature sensors and complex equipment installation during actual use.

[0003] On the other hand, the production and preparation process of concrete products, precast components, and cast-in-place structures is complex and the degree of informatization is low. When quality problems occur during the service of these concrete products or structures, it is usually difficult to trace the source. Some studies use two-dimensional codes to store concrete product information and paste the two-dimensional codes on the surface of products or structures to identify concrete products or structures. However, two-dimensional codes have poor weather resistance, are easily contaminated, worn, fallen off, and even damaged by humans when used on the surface of structures, resulting in a reduced service life of the two-dimensional codes. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a passive wireless temperature-sensing digital aggregate, a preparation method thereof, and an application thereof. The passive wireless temperature-sensing digital aggregate provided by the present invention has high temperature acquisition accuracy and sensitivity, high mechanical strength, and a long service life.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a passive wireless temperature-sensing digital aggregate, which includes a base aggregate and a temperature-sensing radio frequency component inside the base aggregate;

[0007] The raw materials of the base aggregate include a carbon mineralization material, a temperature-sensing radio frequency component, a heat conduction agent, a modifier, a strengthening agent, and water;

[0008] The temperature-sensing radio frequency component includes a temperature-sensing radio frequency chip and a radio frequency antenna;

[0009] The heat conduction agent includes one or more of aluminum oxide powder, aluminum nitride powder, silica powder, and synthetic diamond powder.

[0010] Preferably, the particle size of the heat conduction agent < 150 μm.

[0011] 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.

[0012] Preferably, the modifier is one or more of calcium carbonate fine powder, magnesium carbonate fine powder, limestone powder, and shell powder; the particle size of the modifier is < 20 μm.

[0013] Preferably, the reinforcing agent includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol.

[0014] The present invention also provides a method for preparing the passive wireless temperature-sensing digital aggregate described in the above technical solution, including the following steps:

[0015] Mix the carbon mineralization material, heat-conducting agent, modifier, reinforcing agent, and water to obtain a mixture, and place the mixture and the temperature-sensing radio-frequency component in a mold, and press and mold to obtain an aggregate blank.

[0016] Mineralize the aggregate blank in a carbon dioxide atmosphere to obtain a passive wireless temperature-sensing digital aggregate.

[0017] Preferably, the pressure for pressing and molding is 10 - 60 MPa, and the time is 0.5 - 3 min.

[0018] Preferably, the partial pressure of carbon dioxide in the mineralization is 0.1 - 0.3 MPa, and the volume concentration of carbon dioxide is 20 - 99.9%.

[0019] Preferably, the temperature of the mineralization is 5 - 90 °C, and the duration of the mineralization is 12 - 48 h.

[0020] The present invention also provides the application of the passive wireless temperature-sensing digital aggregate described in the above technical solution or the passive wireless temperature-sensing digital aggregate prepared by the preparation method described in the above technical solution in the temperature monitoring and quality traceability of concrete products.

[0021] The present invention provides a passive wireless temperature-sensing digital aggregate, including a basic aggregate and a temperature-sensing radio-frequency component inside the basic aggregate; the raw materials of the basic aggregate include a carbon mineralization material, a temperature-sensing radio-frequency component, a heat-conducting agent, a modifier, a reinforcing agent, and water; the temperature-sensing radio-frequency component includes a temperature-sensing radio-frequency chip and a radio-frequency antenna; the heat-conducting agent includes one or more of alumina powder, aluminum nitride powder, silica powder, and synthetic diamond powder.

[0022] The passive wireless temperature-sensing digital aggregate provided by the present invention does not require an additional power supply and data transmission line. The internal temperature-sensing radio-frequency component can collect and transmit temperature data in a passive wireless manner. It can also use its globally unique ID number to store effective information and identify the identity of concrete products for traceability. The heat-conducting agent is evenly dispersed in the temperature-sensing digital aggregate, which can increase the thermal conductivity of the temperature-sensing digital aggregate, making it easier for the ambient temperature to spread into the temperature-sensing digital aggregate and be monitored by the internal temperature-sensing radio-frequency chip, thereby improving the accuracy and sensitivity of its temperature collection. The carbonate minerals (magnesium carbonate or calcium carbonate) formed by the carbon mineralization material through the mineralization reaction have a shell-like gradient structure, with excellent thermal conductivity and mechanical properties, making the passive wireless temperature-sensing digital aggregate have a long service life. Moreover, the carbon mineralization product has better compatibility with concrete. Therefore, when the temperature-sensing digital aggregate is used inside concrete, it can perfectly form the concrete skeleton structure without affecting the mechanical properties of the concrete. The modifier can fill the pores of the temperature-sensing digital aggregate, promoting the mineralization reaction to form a more homogeneous microstructure. The enhancer can induce the formation of more carbonate minerals in the mineralization reaction, improving the mechanical strength of the temperature-sensing digital aggregate. At the same time, the modifier and these carbonate minerals can increase the impedance of the temperature-sensing digital aggregate and reduce the transmission attenuation of the electromagnetic wave signal, thereby improving the sensitivity of the temperature-sensing digital aggregate. The present invention can accurately monitor the temperature changes in concrete products such as power products, building walls, and road bridges, and at the same time identify and trace these products, significantly improving the quality management level of concrete products. Detailed implementation mode

[0023] The present invention provides a passive wireless temperature-sensing digital aggregate, which includes a basic aggregate and a temperature-sensing radio-frequency component inside the basic aggregate;

[0024] The raw materials of the basic aggregate include a carbon mineralization material, a temperature-sensing radio-frequency component, a heat-conducting agent, a modifier, an enhancer, and water;

[0025] The temperature-sensing radio-frequency component includes a temperature-sensing radio-frequency chip and a radio-frequency antenna;

[0026] The heat-conducting agent includes one or more of alumina powder, aluminum nitride powder, silica powder, and synthetic diamond powder.

[0027] The passive wireless temperature-sensing digital aggregate provided by the present invention includes a basic aggregate. In the present invention, the raw materials of the basic aggregate include a carbon mineralization material. In the present invention, the carbon mineralization material preferably 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, and more preferably γ-dicalcium silicate; the particle size of the carbon mineralization material is preferably <150 μm, and more preferably <100 μm. When the carbon mineralization material is the above several kinds, the present invention has no special limitation on the ratio of different kinds of carbon mineralization materials, and any ratio can be used.

[0028] The carbonate minerals (magnesium carbonate or calcium carbonate) formed by the carbon mineralization material used in the present invention have a shell-like gradient structure, excellent thermal conductivity and mechanical properties, enabling the passive wireless temperature-sensing digital aggregate to have a long service life. Moreover, the carbon mineralization product has better compatibility with concrete. Therefore, when the temperature-sensing digital aggregate is used inside the concrete, it can perfectly form the concrete skeleton structure without affecting the mechanical properties of the concrete.

[0029] In the present invention, the raw materials of the base aggregate include a thermal conductive agent. In the present invention, the thermal conductive agent includes one or more of alumina powder, aluminum nitride powder, silica powder, and synthetic diamond powder, preferably alumina powder; the particle size of the thermal conductive agent is preferably <150 μm, more preferably <100 μm. When the thermal conductive agent is several of the above, the present invention has no special limitation on the ratio of different types of thermal conductive agents, and any ratio can be used.

[0030] In the present invention, the mass ratio of the carbon mineralization material to the thermal conductive agent is preferably (12 - 80):(0.6 - 8), more preferably (15 - 60):(0.9 - 3.6).

[0031] The thermal conductive agent used in the present invention is uniformly dispersed in the temperature-sensing digital aggregate, which can improve the thermal conductivity of the temperature-sensing digital aggregate. The ambient temperature is more easily diffused into the temperature-sensing digital aggregate and monitored by the internal temperature-sensing radio frequency chip, thereby improving the temperature acquisition accuracy and sensitivity.

[0032] In the present invention, the raw materials of the base aggregate include a modifier. In the present invention, the modifier is preferably one or more of calcium carbonate micropowder, magnesium carbonate micropowder, limestone powder, and shell powder, more preferably calcium carbonate micropowder; the particle size of the modifier is preferably <20 μm, more preferably <15 μm. 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 can be used.

[0033] In the present invention, the mass ratio of the carbon mineralization material to the modifier is preferably (12 - 80):(2.4 - 16), more preferably (15 - 60):(3 - 12).

[0034] The modifier used in the present invention can fill the pores of the temperature-sensing digital aggregate, promote the formation of a more homogeneous microstructure in the mineralization reaction. At the same time, the modifier can significantly increase the impedance of the temperature-sensing digital aggregate and reduce the transmission attenuation of the electromagnetic wave signal, thereby improving the sensitivity of the temperature-sensing digital aggregate.

[0035] In the present invention, the raw materials of the base aggregate include a reinforcing agent. In the present invention, the reinforcing agent preferably includes one or several 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 can be used.

[0036] In the present invention, the mass ratio of the carbon mineralization material to the reinforcing agent is preferably (12 - 80):(0.2 - 4.8), and more preferably (15 - 60):(0.3 - 1.2).

[0037] The reinforcing agent used in the present invention can induce the formation of more carbonate minerals in the mineralization reaction, improve the mechanical strength of the temperature-sensitive digital aggregate, and at the same time, these carbonate minerals can also increase the impedance of the temperature-sensitive digital aggregate, thereby improving the sensitivity of the temperature-sensitive digital aggregate.

[0038] In the present invention, the raw materials of the base aggregate include water. In the present invention, the mass ratio of the carbon mineralization material to water is preferably (12 - 80):(1.8 - 32), and more preferably (15 - 60):(2 - 24).

[0039] The passive wireless temperature-sensitive digital aggregate provided by the present invention includes a temperature-sensitive radio frequency component inside the base aggregate. In the present invention, the raw materials of the base aggregate include a temperature-sensitive radio frequency component; the temperature-sensitive radio frequency component includes a temperature-sensitive radio frequency chip and a radio frequency antenna; the temperature-sensitive radio frequency chip and the radio frequency antenna are commercially available products; the operation of the temperature-sensitive radio frequency component is preferably that the temperature-sensitive radio frequency chip is connected to the radio frequency antenna. Under the excitation of an external signal collector, the data information monitored by the temperature-sensitive 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 a low frequency of 30 - 300 kHz, a high frequency of 3 - 30 MHz, or a super high frequency of 433 - 950 MHz, and more preferably a super high frequency of 433 - 950 MHz; the temperature measurement range of the temperature-sensitive radio frequency chip is preferably -40 - 125 °C, and more preferably -20 - 100 °C.

[0040] In the present invention, the temperature-sensitive radio frequency component can collect and transmit temperature data in a passive wireless manner, and can also use it as a globally unique ID number to effectively store information and identify the identity of concrete products for traceability.

[0041] The present invention also provides a preparation method for the passive wireless temperature-sensitive digital aggregate described in the above technical solution, including the following steps:

[0042] Place the mixture obtained by mixing the carbon mineralization material, heat conduction agent, modifier, reinforcing agent, and water and the temperature-sensitive radio frequency component in a mold, and press and mold to obtain an aggregate blank.

[0043] Mineralize the aggregate blank in a carbon dioxide atmosphere to obtain a passive wireless temperature-sensing digital aggregate.

[0044] Unless otherwise specified, the present invention has no special requirements for the sources of the raw materials used in the preparation, and commercially available products well-known to those skilled in the art can be used.

[0045] In the present invention, a mixture obtained by mixing a carbon mineralization material, a heat conductor, a modifier, a reinforcing agent, and water and a temperature-sensing radio frequency component are placed in a mold and pressed into shape to obtain an aggregate blank.

[0046] In the present invention, the mixing of the carbon mineralization material, the heat conductor, the modifier, the reinforcing agent, and water is preferably as follows: the reinforcing agent and water are first mixed to obtain a mixed solution; the carbon mineralization material, the heat conductor, the modifier, and the mixed solution are secondarily mixed 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 mixing processes well-known in the art.

[0047] In the present invention, the mixture is preferably filled to the half-height position of the mold, then the temperature-sensing 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 disc), or an irregular shape, and only a mold with a corresponding shape needs to be customized according to actual needs.

[0048] In the present invention, the pressure for the pressing into shape is preferably 10 - 60 MPa, more preferably 20 - 40 MPa, the time is 0.5 - 3 min, more preferably 1 - 2 min.

[0049] After obtaining the aggregate blank, the present invention mineralizes the aggregate blank in a carbon dioxide atmosphere to obtain a passive wireless temperature-sensing digital aggregate.

[0050] Before the mineralization, the present invention preferably further includes: controlling the water content of the aggregate blank. In the present invention, the temperature for controlling the water content is preferably 40 - 60 °C, more preferably 40 - 50 °C; the water content of the aggregate blank is preferably controlled to 10 - 20%, more preferably 10 - 15%.

[0051] 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 40 - 60%, more preferably 50%.

[0052] In the present invention, the temperature of the mineralization is preferably 5 - 90 °C, more preferably 20 - 40 °C, and the duration of the mineralization is preferably 12 - 48 h, more preferably 24 - 48 h.

[0053] The present invention also provides the application of the passive wireless temperature-sensing digital aggregate described in the above technical solution or the passive wireless temperature-sensing digital aggregate prepared by the preparation method described in the above technical solution in the quality traceability of temperature monitoring of concrete products.

[0054] The present invention has no special limitation on the application method of the passive wireless temperature-sensing digital aggregate, and the well-known application methods in the art can be adopted.

[0055] 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 cannot be understood as limiting the protection scope of the present invention.

[0056] Example 1

[0057] The carbonation material is dicalcium silicate of γ type, with a particle size < 150 μm, the heat conductive agent is alumina powder, with a particle size < 20 μm, the modifier is calcium carbonate micropowder, with a particle size < 20 μm, and the reinforcing agent is sodium alginate;

[0058] By mass, take 15 parts of dicalcium silicate of γ type, 0.9 part of alumina powder, 3 parts of calcium carbonate micropowder, 0.3 part of sodium alginate, and 2.4 parts of water; disperse sodium alginate in water and stir evenly to form a mixed solution; uniformly mix dicalcium silicate of γ type, alumina powder, calcium carbonate micropowder with the mixed solution to form a mixture; fill the mixture into a square mold with a bottom surface of 20 mm × 20 mm to the half-height position, and place 1 part of the temperature-sensing radio frequency component at the center of the mold, then continue to fill the mixture until it is full, and prepare the aggregate blank by pressing molding, with a pressing pressure of 30 MPa and a time of 2 min; repeat the above steps to prepare 3 aggregate blanks; place the aggregate blanks in a carbon dioxide atmosphere for mineralization, with a partial pressure of carbon dioxide of 0.2 MPa, a volume concentration of carbon dioxide of 99.9%, a relative humidity of 50%, a mineralization temperature of 25 °C, and a mineralization duration of 24 h to obtain the passive wireless temperature-sensing digital aggregate.

[0059] Example 2

[0060] The difference from Example 1 is only that the heat conductive agent is 1.5 parts of alumina powder, and the others are the same as in Example 1.

[0061] Example 3

[0062] The difference from Example 1 is only that the heat conductive agent is 2.1 parts of alumina powder, and the others are the same as in Example 1.

[0063] Example 4

[0064] The difference from Example 1 is only that the modifier is 3.8 parts of calcium carbonate micropowder, and the others are the same as in Example 1.

[0065] Example 5

[0066] The difference from Example 1 is only that the modifier is 4.6 parts of calcium carbonate fine powder, and the others are the same as in Example 1.

[0067] Example 6

[0068] The difference from Example 1 is only that the reinforcing agent is 0.6 parts of sodium alginate, and the others are the same as in Example 1.

[0069] Example 7

[0070] The difference from Example 1 is only that the reinforcing agent is 0.9 parts of sodium alginate, and the others are the same as in Example 1.

[0071] Comparative Example 1

[0072] By mass, take 20 parts of ordinary portland cement and 6 parts of water. Mix the ordinary portland cement 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, place 1 part of the temperature-sensitive radio frequency component at the center of the mold, and continue to fill the mixture until it is full; place the mixture with the temperature-sensitive 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 temperature-sensitive digital aggregate prepared using ordinary portland cement.

[0073] Comparative Example 2

[0074] The difference from Comparative Example 1 is only that the cement for preparing the temperature-sensitive digital aggregate is white portland cement, and the others are the same as in Comparative Example 1.

[0075] Performance Test

[0076] The compressive strength of the passive wireless temperature-sensitive digital aggregates prepared in Examples 1 to 7 and Comparative Examples 1 to 2, and the ambient temperature and sensitivity obtained using the signal collector were tested. The results are shown in Table 1.

[0077] Test the compressive strength of 3 pieces of passive wireless temperature-sensitive digital aggregates. The compressive strength is tested with reference to the national standard "GB / T50081-2002 Standard for Test Methods of Mechanical Properties of Ordinary Concrete", and calculate their average compressive strength; place the passive wireless temperature-sensitive digital aggregates in a standard environment of 40 °C, and use the signal collector to read the temperature collected by the passive wireless temperature-sensitive digital aggregates. The working frequency of the signal collector is 433 - 950 MHz ultra-high frequency, and record the sensitivity of the signal collector. The sensitivity is the minimum power required for the signal collector to obtain the temperature monitoring data of the passive wireless temperature-sensitive digital aggregates. The smaller the value, the higher the sensitivity.

[0078] Table 1 Results of Compressive Strength, Temperature Acquisition and Sensitivity of Passive Wireless Temperature-Sensitive Digital Aggregates Prepared in Each Example and Comparative Example

[0079]

[0080] As can be seen from Table 1, the passive wireless temperature-sensing digital aggregates prepared in each example can accurately monitor the ambient temperature. However, the monitoring results of the temperature-sensing digital aggregates prepared in Comparative Examples 1 and 2 have a large difference from the ambient temperature. This is because the digital aggregates prepared in the present invention use carbonate minerals as the matrix and have excellent thermal conductivity. Under the action of the thermal conductive agent, their thermal conductivity can be further improved, so the ambient temperature can be monitored more accurately. However, the thermal conductivity of the cement hydration products is low, and it is difficult to accurately monitor the ambient temperature. The compressive strength and sensitivity of the digital aggregates prepared in each example are higher than those in Comparative Examples 1 and 2. This is because Comparative Examples 1 and 2 form strength through cement hydration, resulting in a high porosity of the matrix and thus a low compressive strength. In each example of the present invention, strength is formed by the carbonation of the carbonation material, and the matrix has a low porosity, so the compressive strength is high. Under the action of the strengthening agent, its compressive strength can be further improved. At the same time, 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. However, 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. Under the action of the modifier, its attenuation of electromagnetic waves can be further reduced, so the sensitivity is higher.

[0081] As can be seen from Examples 1 to 3, increasing the amount of the thermal conductive agent used can significantly improve the temperature monitoring sensitivity of the temperature-sensing digital aggregate. This is because increasing the amount of the thermal conductive agent used can increase the thermal conductivity of the temperature-sensing digital aggregate, and the ambient temperature is more easily diffused into the digital aggregate and monitored by the internal temperature-sensing radio frequency chip, thus improving the sensitivity of the digital aggregate. In addition, increasing the amount of the thermal conductive agent used has little effect on the compressive strength of the digital aggregate.

[0082] Compared with Example 1, Examples 4 and 5 use a modifier to conduct electrical modification on the matrix of the digital aggregate. As the amount of the modifier used increases, the compressive strength of the digital aggregate increases, and at the same time, the sensitivity increases. This is because the modifier can fill the pores of the digital aggregate, promote the mineralization reaction to form a more homogeneous microstructure, and at the same time, the modifier can significantly increase the impedance of the digital aggregate and reduce the transmission attenuation of the electromagnetic wave signal, thus improving the sensitivity of the digital aggregate.

[0083] Both Example 1 and Examples 6 and 7 add a strengthening agent, and as the amount of the strengthening 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 strengthening agent can induce the formation of more carbonate minerals in the mineralization reaction, improve the mechanical strength of the digital aggregate, and at the same time, these carbonate minerals can also increase the impedance of the digital aggregate, thus improving the sensitivity of the digital aggregate.

[0084] 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 passive wireless temperature-sensing digital aggregate, characterized in that, It includes a base aggregate and a temperature-sensitive radio frequency component inside the base aggregate; The raw materials of the base aggregate include a carbon mineralization material, a temperature-sensitive radio frequency component, a heat conductive agent, a modifier, a reinforcing agent, and water; The temperature-sensitive radio frequency component includes a temperature-sensitive radio frequency chip and a radio frequency antenna; The heat conductive agent includes one or more of aluminum oxide powder, aluminum nitride powder, silica powder, and synthetic diamond powder; 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 one or more of calcium carbonate micropowder, magnesium carbonate micropowder, limestone powder, and shell powder; The reinforcing agent includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol.

2. The passive wireless temperature-sensing digital aggregate according to claim 1, wherein The particle size of the heat conductive agent < 150 µm.

3. The passive wireless temperature-sensing digital aggregate according to claim 1, wherein The particle size of the carbon mineralization material < 150 µm.

4. The passive wireless temperature-sensing digital aggregate according to claim 1, wherein The particle size of the modifier < 20 µm.

5. The preparation method of the passive wireless temperature-sensing digital aggregate according to any one of claims 1 to 4, characterized in that, It includes the following steps: Put the mixture obtained by mixing the carbon mineralization material, the heat conductive agent, the modifier, the reinforcing agent, and water and the temperature-sensitive radio frequency component into a mold, and carry out compression molding to obtain an aggregate blank; Mineralize the aggregate blank in a carbon dioxide atmosphere to obtain a passive wireless temperature-sensing digital aggregate.

6. The preparation method of the passive wireless temperature-sensing digital aggregate according to claim 5, characterized in that, The pressure of the compression molding is 10 - 60 MPa, and the time is 0.5 - 3 min.

7. The preparation method of the passive wireless temperature-sensing digital aggregate according to claim 5, wherein The partial pressure of carbon dioxide in the mineralization is 0.1 - 0.3 MPa, and the volume concentration of carbon dioxide is 20 - 99.9%.

8. The preparation method of the passive wireless temperature-sensing digital aggregate according to claim 5 or 7, characterized in that, The temperature of the mineralization is 5 - 90 °C, and the duration of the mineralization is 12 - 48 h.

9. Application of the passive wireless temperature-sensing digital aggregate according to any one of claims 1 - 4 or the passive wireless temperature-sensing digital aggregate prepared by the preparation method according to any one of claims 5 - 8 in temperature monitoring and quality traceability of concrete products.

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