A long-distance wireless identification digital aggregate and its preparation method and application

Abstract

The present invention belongs to the technical field of intelligent building materials, and specifically relates to a long-distance wireless identification digital aggregate and its preparation method and application. The long-distance wireless identification digital aggregate provided by the present invention includes a first aggregate module and a second aggregate module. The first aggregate module contains a radio frequency component, which can effectively store information and identify the concrete products, receive and transmit radio frequency signals, and the second aggregate module contains a wave reflector, which can enhance the radio frequency signal transmission of the first aggregate module and reduce the shielding of the radio frequency signal by the metal material. Moreover, under the action of the modifier and the reinforcing agent, the shell-like gradient structure formed by the mineralization reaction of the carbon mineralized material has excellent mechanical properties. Therefore, the digital aggregate provided by the present invention has good signal transmission performance, high mechanical strength, and good compatibility with concrete.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent building materials, and in particular relates to a long-distance wireless identification digital aggregate and a preparation method and application thereof. Background Art

[0002] The production and preparation processes for concrete products, prefabricated components, and cast-in-place structures are complex and have a low level of informatization. When these concrete products or structures experience quality issues during service, traceability is often difficult. Using QR code technology to store concrete product information and affix the code to the surface of the product or structure allows for identification. However, QR codes have poor weather resistance and are susceptible to contamination, wear, and detachment when used on structural surfaces. They are also prone to vandalism, resulting in a short service life for the QR code, which cannot match the lifespan of the concrete product.

[0003] Furthermore, while RFID tags offer the advantage of greater durability over QR codes, actual use has revealed that various silicate mineralizations, their hydration products, and water within concrete significantly attenuate RF signals. Furthermore, metal materials such as rebar within concrete shield RF signals, resulting in a shorter signal reading distance. When RFID tags are embedded 2 cm into concrete, the RF signal can be detected at a distance of less than 0.5 m, significantly limiting their application in concrete products. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a long-distance wireless identification digital aggregate and its preparation method and application. The long-distance wireless identification digital aggregate provided by the present invention has good signal transmission performance, high mechanical strength, and good compatibility with concrete.

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

[0006] The present invention provides a long-distance wireless identification digital aggregate, comprising a first aggregate module and a second aggregate module;

[0007] The raw materials of the first aggregate module include radio frequency components, a first carbon mineralized material, a first modifier, a first reinforcing agent and water;

[0008] The raw materials of the second aggregate module include a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water;

[0009] The radio frequency component is composed of a radio frequency chip and a radio frequency antenna connected to each other;

[0010] The wave reflector includes one or more of iron powder, iron oxide powder, aluminum oxide powder and copper oxide powder.

[0011] Preferably, the mass ratio of the first carbon mineralized material, the first modifier, the first reinforcing agent and water in the first aggregate module is (15-54):(1.5-10.8):(0.8-4.2):(2.4-8.2).

[0012] Preferably, the mass ratio of the second carbon mineralized material, wave reflector, second modifier, second reinforcing agent and water in the second aggregate module is (15-54):(1.5-16.2):(1.5-10.8):(0.8-4.2):(2.4-8.2).

[0013] Preferably, the first carbon mineralized material and the second carbon mineralized material independently include 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 the particle size of the first carbon mineralized material and the second carbon mineralized material are independently less than 150 μm.

[0014] Preferably, the particle size of the wave reflector is less than 20 μm.

[0015] Preferably, the first modifier and the second modifier independently include one or more of calcium carbonate powder, magnesium carbonate powder, limestone powder and shell powder; the particle size of the first modifier and the second modifier independently is less than 20 μm.

[0016] Preferably, the first enhancer and the second enhancer independently include one or more of chitosan, sodium alginate, polyethylene glycol and polyvinyl alcohol.

[0017] The present invention also provides a method for preparing the long-distance wireless identification digital aggregate described in the above technical solution, comprising the following steps:

[0018] A first carbon mineralized material, a first modifier, a first reinforcing agent, and water are mixed, the obtained first mixture and a radio frequency component are placed in a first mold, and first compression molding and first mineralization in a carbon dioxide atmosphere are sequentially performed to obtain a first aggregate module;

[0019] Mixing a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent, and water, placing the obtained second mixture in a second mold, and sequentially performing a second press molding and a second mineralization in a carbon dioxide atmosphere to obtain a second aggregate module;

[0020] The first aggregate module and the second aggregate module are assembled to obtain a long-distance wireless identification digital aggregate.

[0021] Preferably, the temperature of the first mineralization and the second mineralization are independently 5 to 90° C.; and the time of the first mineralization and the second mineralization are independently 12 to 48 hours.

[0022] The present invention also provides the application of the long-distance wireless identification digital aggregate described in the above technical solution or the long-distance wireless identification digital aggregate prepared by the preparation method described in the above technical solution in the identification management and quality traceability of concrete products.

[0023] The present invention provides a long-distance wireless identification digital aggregate, comprising a first aggregate module and a second aggregate module; the raw materials of the first aggregate module include a radio frequency component, a first carbon mineralized material, a first modifier, a first reinforcing agent and water; the raw materials of the second aggregate module include a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water; the radio frequency component is composed of a connected radio frequency chip and a radio frequency antenna; the wave reflector includes one or more of iron micropowder, iron oxide powder, aluminum oxide powder and copper oxide powder.

[0024] The long-distance wireless identification digital aggregate provided by the present invention includes a first aggregate module and a second aggregate module, wherein the first aggregate module contains a radio frequency component, which can effectively store information and identify concrete products, receive and transmit radio frequency signals, and the second aggregate module contains a wave reflector, which can enhance the radio frequency signal transmission of the first aggregate module and reduce the shielding of the radio frequency signal by the metal material. The main components of the first and second aggregate modules prepared by the present invention are carbon mineralized materials, which have a single phase, large impedance, and low attenuation of radio frequency signals. The modifier is evenly dispersed in the first and second aggregate modules of the digital aggregate, which can improve the electrical impedance of the digital aggregate and reduce the transmission attenuation of electromagnetic wave signals. The enhancer can induce the generation of more carbonate minerals in the mineralization reaction to form a shell-like gradient structure, thereby improving the mechanical strength of each module of the digital aggregate. Under the action of the modifier and the enhancer, the shell-like gradient structure formed by the mineralization reaction of the carbon mineralized material has excellent mechanical properties. Therefore, the digital aggregate provided by the present invention has good signal transmission performance, high mechanical strength, and good compatibility with concrete. The technical principle of the present invention is simple and the effect is obvious, and it can be widely used in the identification management and quality traceability of concrete products, prefabricated components or cast-in-place structures. DETAILED DESCRIPTION

[0025] The present invention provides a long-distance wireless identification digital aggregate, characterized in that it comprises a first aggregate module and a second aggregate module;

[0026] The raw materials of the first aggregate module include radio frequency components, a first carbon mineralized material, a first modifier, a first reinforcing agent and water;

[0027] The raw materials of the second aggregate module include a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water;

[0028] The radio frequency component is composed of a radio frequency chip and a radio frequency antenna connected to each other;

[0029] The wave reflector includes one or more of iron powder, iron oxide powder, aluminum oxide powder and copper oxide powder.

[0030] Unless otherwise specified, the present invention has no special requirements on the sources of the raw materials used, and commercially available products known to those skilled in the art can be used.

[0031] The long-distance wireless identification digital aggregate provided by the present invention includes a first aggregate module. In the present invention, the raw materials of the first aggregate module include a radio frequency component, a first carbon mineralized material, a first modifier, a first reinforcing agent and water.

[0032] In the present invention, the RF component is composed of a connected RF chip and an RF antenna; the RF chip and the RF antenna are commercially available products; the operation of the RF component is preferably: under the excitation of the signal collector, the internal information of the RF chip can be sent by the RF antenna and received by the signal collector; the operating frequency of the signal collector preferably includes 30-300kHz low frequency, 3-30MHz high frequency and 433-950MHz ultra-high frequency, more preferably 433-950MHz ultra-high frequency.

[0033] The first aggregate module contains a radio frequency component that can effectively store information and identify the concrete products, and receive and transmit radio frequency signals.

[0034] In the present invention, the first carbon mineralized material preferably includes one or more of tricalcium silicate, gamma-type dicalcium silicate, beta-type dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide, with gamma-type dicalcium silicate being more preferred. The particle size of the first carbon mineralized material is preferably less than 150 μm, more preferably less than 100 μm. When the first carbon mineralized material is any of the above, the present invention does not specifically limit the ratio of the different types of first carbon mineralized materials, and any ratio may be used.

[0035] In the present invention, the first modifier preferably includes one or more of calcium carbonate powder, magnesium carbonate powder, limestone powder, and shell powder, more preferably calcium carbonate powder; the particle size of the first modifier is preferably less than 20 μm, more preferably less than 15 μm. When the first modifier is one of the above-mentioned types, the present invention does not specifically limit the ratio of different types of first modifiers, and any ratio can be used. The modifier used in the present invention is uniformly dispersed in the first and second aggregate modules of the digital aggregate, which can increase the electrical impedance of the digital aggregate and reduce the transmission attenuation of electromagnetic wave signals.

[0036] In the present invention, the first reinforcing agent preferably comprises one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol, with sodium alginate being more preferred. When the first reinforcing agent comprises any of the aforementioned first reinforcing agents, the present invention does not specifically limit the ratio of the different types of first reinforcing agents; any ratio may be used. The reinforcing agent used in the present invention can induce the formation of more carbonate minerals during the mineralization reaction, forming a shell-like gradient structure and improving the mechanical strength of each module of the digital aggregate.

[0037] In the present invention, the mass ratio of the first carbon mineralized material, the first modifier, the first reinforcing agent and water in the first aggregate module is preferably (15-54):(1.5-10.8):(0.8-4.2):(2.4-8.2), and more preferably (20-40):(2-8):(1-3):(3-6).

[0038] The long-distance wireless identification digital aggregate provided by the present invention includes a second aggregate module. In the present invention, the raw materials of the second aggregate module include a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water.

[0039] In the present invention, the wave reflector comprises one or more of iron powder, iron oxide powder, aluminum oxide powder, and copper oxide powder, preferably iron powder. The particle size of the wave reflector is preferably less than 20 μm, more preferably less than 15 μm. When the wave reflector comprises any of the above-mentioned types, the present invention does not specifically limit the ratio of the different types of wave reflectors; any ratio may be used. The wave reflector can reflect electromagnetic waves with frequencies of 30 to 300 kHz, 3 to 30 MHz, or 433 to 950 MHz.

[0040] The second aggregate module contains a wave reflector, which can enhance the radio frequency signal transmission of the first aggregate module and reduce the shielding of the radio frequency signal by the metal material.

[0041] In the present invention, the second carbon mineralized material preferably includes one or more of tricalcium silicate, gamma-type dicalcium silicate, beta-type dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide, with gamma-type dicalcium silicate being more preferred. The particle size of the second carbon mineralized material is preferably less than 150 μm, more preferably less than 100 μm. When the second carbon mineralized material is selected from the above-mentioned types, the present invention does not specifically limit the ratio of the different types of second carbon mineralized materials, and any ratio may be used.

[0042] In the present invention, the second modifier preferably includes one or more of calcium carbonate powder, magnesium carbonate powder, limestone powder, and shell powder, with calcium carbonate powder being more preferred. The particle size of the second modifier is preferably less than 20 μm, more preferably less than 15 μm. When the second modifier is selected from the above-mentioned types, the present invention does not specifically limit the ratio of the different types of second modifiers; any ratio may be used.

[0043] In the present invention, the second reinforcing agent preferably includes one or more of chitosan, sodium alginate, polyethylene glycol, and polyvinyl alcohol, and more preferably sodium alginate. When the second reinforcing agent is one of the above-mentioned types, the present invention has no particular limitation on the ratio of different types of second reinforcing agents, and any ratio can be used.

[0044] In the present invention, the mass ratio of the second carbon mineralized material, wave reflector, second modifier, second reinforcing agent and water in the second aggregate module is preferably (15-54):(1.5-16.2):(1.5-10.8):(0.8-4.2):(2.4-8.2), and more preferably (20-40):(2-8):(2-8):(1-3):(3-6).

[0045] The present invention also provides a method for preparing the long-distance wireless identification digital aggregate described in the above technical solution, comprising the following steps:

[0046] A first carbon mineralized material, a first modifier, a first reinforcing agent, and water are mixed, the obtained first mixture and a radio frequency component are placed in a first mold, and first compression molding and first mineralization in a carbon dioxide atmosphere are sequentially performed to obtain a first aggregate module;

[0047] Mixing a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent, and water, placing the obtained second mixture in a second mold, and sequentially performing a second press molding and a second mineralization in a carbon dioxide atmosphere to obtain a second aggregate module;

[0048] The first aggregate module and the second aggregate module are assembled to obtain a long-distance wireless identification digital aggregate.

[0049] The present invention mixes a first carbon mineralized material, a first modifier, a first reinforcing agent and water, places the obtained first mixture and a radio frequency component in a first mold, performs a first compression molding, and obtains a first aggregate module blank.

[0050] In the present invention, the mixing of the first carbon mineralized material, the first modifier, the first reinforcing agent, and water is preferably performed by first mixing the first reinforcing agent and water, and then second mixing the resulting mixed solution, the first carbon mineralized material, and the first modifier to obtain a first mixed material. The present invention does not particularly limit the first and second mixing processes; any mixing process known in the art may be used to uniformly mix the materials.

[0051] In the present invention, the shape of the first mold is preferably a cylinder, a block or a disc, more preferably a block; there is no special limitation on the shape of the first mold in the present invention, and it can be selected according to needs.

[0052] In the present invention, the first mixture and the RF component are placed in the first mold preferably by first placing the first mixture in the first mold to a half-height position, then placing the RF component in the center of the first mold, and then continuing to load the first mixture into the first mold until it is full.

[0053] In the present invention, the pressure of the first pressing molding is preferably 10 to 60 MPa, more preferably 20 to 40 MPa, and the time is preferably 0.5 to 3 min, more preferably 1 to 2 min.

[0054] After obtaining the first aggregate module blank, the present invention performs a first mineralization on the first aggregate module blank in a carbon dioxide atmosphere to obtain a first aggregate module.

[0055] In the present invention, the temperature of the first mineralization is preferably 5 to 90°C, more preferably 20 to 40°C; the time of the first mineralization is preferably 12 to 48 hours, more preferably 24 to 48 hours; the partial pressure of carbon dioxide in the carbon dioxide atmosphere of the first mineralization is preferably 0.1 to 0.3 MPa, more preferably 0.2 to 0.3 MPa, and the volume concentration is preferably 20 to 99.9%, more preferably 50 to 99.9%; the relative humidity of the carbon dioxide atmosphere is preferably 50%.

[0056] The present invention mixes a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water, places the obtained second mixture in a second mold, performs a second compression molding, and obtains a second aggregate module blank.

[0057] In the present invention, the mixing of the wave reflector, the second carbon mineralized material, the second modifier, the second reinforcing agent, and water is preferably performed by first performing a third mixing of the second reinforcing agent and water, and then performing a fourth mixing of the resulting mixed solution, the second carbon mineralized material, the wave reflector, and the second modifier to obtain a second mixed material. The present invention does not particularly limit the third and fourth mixing processes; any mixing process known in the art may be employed to uniformly mix the materials.

[0058] In the present invention, the second mold is preferably the same as the first mold.

[0059] The present invention has no particular limitation on how the second mixed material is placed in the second mold, as long as the second mixed material fills the second mold.

[0060] In the present invention, the pressure of the second press molding is preferably 10 to 60 MPa, more preferably 20 to 40 MPa, and the time is preferably 0.5 to 3 min, more preferably 1 to 2 min.

[0061] After obtaining the second aggregate module green body, the present invention performs a second mineralization on the second aggregate module green body in a carbon dioxide atmosphere to obtain a second aggregate module.

[0062] In the present invention, the temperature of the second mineralization is preferably 5 to 90° C., more preferably 20 to 40° C.; the time of the second mineralization is preferably 12 to 48 hours, more preferably 24 to 48 hours; the partial pressure of carbon dioxide in the carbon dioxide atmosphere of the second mineralization is preferably 0.1 to 0.3 MPa, more preferably 0.2 to 0.3 MPa, and the volume concentration is preferably 20 to 99.9%, more preferably 50 to 99.9%.

[0063] After obtaining the first aggregate module and the second aggregate module, the present invention assembles the first aggregate module and the second aggregate module to obtain a long-distance wireless identification digital aggregate.

[0064] In the present invention, the assembling is preferably performed by placing the first aggregate module directly above the second aggregate module, and then assembling by gluing or bundling, more preferably gluing.

[0065] The first and second aggregate modules prepared by the present invention are primarily composed of carbon mineralized materials, which have a single physical phase, high impedance, and low radio frequency signal attenuation. Under the action of modifiers and reinforcing agents, the mineralization reaction of the carbon mineralized materials forms a shell-like gradient structure with excellent mechanical properties.

[0066] The present invention also provides the application of the long-distance wireless identification digital aggregate described in the above technical solution or the long-distance wireless identification digital aggregate prepared by the preparation method described in the above technical solution in the identification management and quality traceability of concrete products.

[0067] The present invention has no special limitation on the application of the long-distance wireless identification digital aggregate in the identification management and quality traceability of concrete products, and any application method well known in the art can be used.

[0068] The technical solutions of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention, but they should not be understood as limiting the scope of protection of the present invention.

[0069] Example 1

[0070] The carbon mineralization material is γ-type dicalcium silicate with a particle size of less than 150 μm, the wave reflector is iron powder with a particle size of less than 20 μm, the modifier is calcium carbonate powder with a particle size of less than 20 μm, and the reinforcing agent is sodium alginate;

[0071] Take 20 parts by mass of γ-type dicalcium silicate, 2 parts of calcium carbonate powder, 1.2 parts of sodium alginate, and 3.2 parts of water. Disperse the sodium alginate in water and stir evenly to form a mixed solution. Evenly mix the γ-type dicalcium silicate, calcium carbonate powder, and the mixed solution to form a mixture. Fill the mixture into a square mold with a bottom surface of 20mm x 20mm to half height, place one part of the RF component in the center of the mold, and continue to fill the mixture until it is full. Prepare the first aggregate module blank by pressing at a pressing pressure of 30MPa and a pressing time of 2 minutes.

[0072] Take the same weight ratio of gamma-type dicalcium silicate, calcium carbonate powder, sodium alginate, and water as used to prepare the first aggregate module blank, and also take 4 parts of iron powder. Disperse the sodium alginate in the water and stir evenly to form a mixed solution. Evenly mix the gamma-type dicalcium silicate, iron powder, and calcium carbonate powder with the mixed solution to form a mixture. Fill the mixture into a mold once and press it to form the second aggregate module blank. The mold size and pressing pressure are the same as those used in the preparation process of the first aggregate module blank.

[0073] Repeat the above steps to prepare 3 pieces of the first aggregate module blank and 3 pieces of the second aggregate module blank. The blanks are placed in a carbon dioxide atmosphere for mineralization at a mineralization temperature of 25°C, a mineralization time of 24 hours, a relative humidity of 50%, a carbon dioxide volume concentration of 99.9%, and a carbon dioxide partial pressure of 0.3 MPa to obtain the first and second aggregate modules; the first and second aggregate modules are assembled by gluing, wherein the first aggregate module is arranged directly above the second aggregate module to obtain a digital aggregate.

[0074] Example 2

[0075] The only difference from Example 1 is that the modifier used to prepare the first aggregate module and the second aggregate module is 4 parts of calcium carbonate powder, and the rest is the same as Example 1.

[0076] Example 3

[0077] The only difference from Example 1 is that the modifier used to prepare the first aggregate module and the second aggregate module is 6 parts of calcium carbonate powder, and the rest is the same as Example 1.

[0078] Example 4

[0079] The only difference from Example 1 is that the reinforcing agent used to prepare the first aggregate module and the second aggregate module is 1.6 parts of sodium alginate, and the rest is the same as Example 1.

[0080] Example 5

[0081] The only difference from Example 1 is that the reinforcing agent for preparing the first aggregate module and the second aggregate module is 2 parts of sodium alginate, and the rest is the same as Example 1.

[0082] Example 6

[0083] The only difference from Example 1 is that the wave reflector used to prepare the second aggregate module is 6 parts of iron powder, and the rest is the same as Example 1.

[0084] Example 7

[0085] The only difference from Example 1 is that the wave reflector used to prepare the second aggregate module is 8 parts of iron powder, and the rest is the same as Example 1.

[0086] Comparative Example 1

[0087] Mix 20 parts by mass of ordinary Portland cement and 6 parts by mass of water to form a mixture. Fill the mixture into a 20 mm x 20 mm square mold to halfway, place one RF component in the center of the mold, and continue adding the mixture until the mold is completely filled. Curing the mixture with the RF component in a standard curing room at 25°C and 90% relative humidity for 28 days yields digital aggregate made from ordinary Portland cement.

[0088] Comparative Example 2

[0089] The only difference from Comparative Example 1 is that the cement used to prepare the digital aggregate is white Portland cement, and the rest is the same as Comparative Example 1.

[0090] Performance Testing

[0091] The compressive strength of the digital aggregates prepared in Examples 1-7 and Comparative Examples 1-2 was tested in accordance with the national standard "GB / T 50081-2002 Standard for Test Methods of Mechanical Properties of Ordinary Concrete." The maximum reading distance of the signal collector was also tested under two operating conditions: 1. The digital aggregate was directly buried in the concrete, with the first aggregate module buried to a depth of 2 cm; 2. The digital aggregate was first tied to steel bars and then buried in the concrete, with the first aggregate module buried to a depth of 2 cm. The digital aggregate was read using a signal collector operating at an ultra-high frequency of 433-950 MHz, and the maximum reading distance of the signal collector was recorded. The results are shown in Table 1.

[0092] Table 1 Compressive strength and reading distance of digital aggregates prepared in Examples 1 to 7 and Comparative Examples 1 to 2

[0093]

[0094] As can be seen from Table 1, compared with Comparative Examples 1 and 2, the compressive strength of the digital aggregates prepared in each embodiment is higher than that of the comparative examples. This is because Comparative Examples 1 and 2 form strength by cement hydration, resulting in high matrix porosity and thus low compressive strength; while the embodiments of the present invention form strength by carbonization of carbon mineralized materials, resulting in low matrix porosity and thus high compressive strength. The reading distance of the digital aggregates prepared in each embodiment is much greater than that of Comparative Examples 1 and 2. This is because cement hydration produces a variety of silicate minerals with low impedance and large attenuation of electromagnetic wave signal transmission; while the present invention utilizes carbonization of carbon mineralized materials to produce a single product phase with high impedance and thus small attenuation of electromagnetic wave signal transmission. On the other hand, the reading distance of Comparative Examples 1 and 2 under working condition 2 is significantly lower than that under working condition 1. This is because metal has a shielding effect on electromagnetic wave signals, resulting in a reduction in signal transmission distance. The digital aggregates prepared by the present invention can avoid metal interference by adding a wave reflector, and the reading distances under the two working conditions are close.

[0095] Compared to Example 1, Examples 2 and 3 used a modifier to electrically modify the digital aggregate matrix. As the amount of modifier increased, the compressive strength of the digital aggregate increased, and the reading distance also improved. This is because the modifier can fill the pores of the digital aggregate, prompting the mineralization reaction to form a more homogeneous microstructure. It also significantly increases the impedance of the digital aggregate, reducing the transmission attenuation of electromagnetic wave signals, thereby improving the reading distance of the digital aggregate.

[0096] In Examples 1, 4, and 5, reinforcing agents were added. As the amount of reinforcing agent increased, the compressive strength of the digital aggregate significantly increased, and the reading distance also slightly increased. This is because the reinforcing agent can induce the formation of more carbonate minerals during the mineralization reaction, increasing the mechanical strength of the digital aggregate. These carbonate minerals also increase the impedance of the digital aggregate, thereby improving the reading distance of the digital aggregate.

[0097] In Examples 1, 6, and 7, wave reflectors were added. As the amount of reflector increased, the compressive strength of the digital aggregate decreased, but its reading distance significantly increased. This is because the reflector does not participate in the mineralization reaction, and its large use can increase interfacial defects in the digital aggregate, leading to reduced mechanical properties. Furthermore, the reflector can enhance the reflection of electromagnetic waves from the second aggregate module of the digital aggregate, thereby enhancing the digital aggregate's signal transmission performance.

[0098] From the reading distances of the embodiments in Table 1 under two working conditions, it can be seen that the digital aggregate prepared by the present invention has a relatively long reading distance of 3.6 to 4.9 meters when it is directly embedded in concrete or tied to the steel bars inside the concrete.

[0099] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention rather than all the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A long-distance wireless identification digital aggregate, characterized in that, comprising a first aggregate module and a second aggregate module; The raw materials of the first aggregate module include radio frequency components, a first carbon mineralized material, a first modifier, a first reinforcing agent and water; The raw materials of the second aggregate module include a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent and water; The radio frequency component includes a radio frequency chip and a radio frequency antenna; The wave reflector comprises one or more of iron powder, iron oxide powder, aluminum oxide powder and copper oxide powder; The first carbon mineralized material and the second carbon mineralized material independently include one or more of tricalcium silicate, gamma-type dicalcium silicate, beta-type dicalcium silicate, monocalcium silicate, tricalcium disilicate, calcium hydroxide, magnesium hydroxide, calcium oxide and magnesium oxide; The first modifier and the second modifier independently include one or more of calcium carbonate powder, magnesium carbonate powder, limestone powder and shell powder; The first enhancer and the second enhancer independently include one or more of chitosan, sodium alginate, polyethylene glycol and polyvinyl alcohol.

2. The long-distance wireless identification digital aggregate according to claim 1, characterized in that: The mass ratio of the first carbon mineralized material, the first modifier, the first reinforcing agent and water in the first aggregate module is (15~54):(1.5~10.8):(0.8~4.2):(2.4~8.2).

3. The long-distance wireless identification digital aggregate according to claim 1, characterized in that: The mass ratio of the second carbon mineralized material, the wave reflector, the second modifier, the second reinforcing agent and water in the second aggregate module is (15~54):(1.5~16.2):(1.5~10.8):(0.8~4.2):(2.4~8.2).

4. The long-distance wireless identification digital aggregate according to claim 1, characterized in that: The particle sizes of the first carbon mineralized material and the second carbon mineralized material are independently less than 150 μm.

5. The long-distance wireless identification digital aggregate according to claim 1, characterized in that: The particle size of the wave reflecting agent is less than 20µm.

6. The long-distance wireless identification digital aggregate according to claim 1, characterized in that: The particle sizes of the first modifier and the second modifier are independently less than 20 μm.

7. The method for preparing a long-distance wireless identification digital aggregate according to any one of claims 1 to 6, characterized in that: The following steps are involved: A first carbon mineralized material, a first modifier, a first reinforcing agent, and water are mixed, the obtained first mixture and a radio frequency component are placed in a first mold, and first compression molding and first mineralization in a carbon dioxide atmosphere are sequentially performed to obtain a first aggregate module; Mixing a wave reflector, a second carbon mineralized material, a second modifier, a second reinforcing agent, and water, placing the obtained second mixture in a second mold, and sequentially performing a second press molding and a second mineralization in a carbon dioxide atmosphere to obtain a second aggregate module; The first aggregate module and the second aggregate module are combined to obtain a long-distance wireless identification digital aggregate.

8. The preparation method according to claim 7, characterized in that The temperature of the first mineralization and the second mineralization are independently 5-90° C.; the time of the first mineralization and the second mineralization are independently 12-48 hours.

9. Use of the long-distance wireless identification digital aggregate according to any one of claims 1 to 6 or the long-distance wireless identification digital aggregate prepared by the preparation method according to claim 7 or 8 in the identification management and quality traceability of concrete products.

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