Modified radiation-proof powder and radiation-proof concrete crack repair grouting material

Abstract

The present invention is a modified radiation-proof powder and a radiation-proof concrete crack repair grouting material. The preparation process of the modified radiation-proof powder is as follows: 1) the micron-level radiation-proof powder with monodispersity is evenly distributed in a high-speed airflow, and the composite modifier is atomized by spraying, and the two airflows are counter-mixed; the mass composition of the composite modifier is: 20-40% of a film-forming agent, 20-40% of a polyamide wax, and 10-20% of a silane coupling agent as a solute, and a mixture of alcohols and ketones as a solvent 20-40%; after mixing, the composite modifier is adsorbed on the surface of the radiation-proof powder to form a coating film; 2) high-temperature gas is introduced into the mixed airflow to evaporate the solvent in the coating film, so that the solute in the composite modifier is wrapped in the form of a film on the surface of the radiation-proof powder; 3) the radiation-proof powder obtained in step 2) is collected with a bag dust collector, and then water-selected and impurities are removed and dried to obtain the modified radiation-proof powder. It can not only repair the strength of the radiation-proof concrete structure, but also have the radiation-proof function repair.

Description

Technical Field

[0001] The invention relates to a modified radiation-proof powder and a radiation-proof concrete crack repair grouting material. Background Art

[0002] Cracks in radiation-proof concrete have a great impact on the durability and radiation-proof effect of concrete structures. Grouting and repairing cracks with grouting materials is currently the most common method for repairing concrete cracks. Epoxy resin grouting materials have high strength, strong adhesion, low shrinkage, and are easy to operate. They are the preferred grouting materials for grouting and repairing concrete cracks.

[0003] Since radiation-proof concrete has its own radiation-proof function, the formation of cracks affects its radiation-proof effect. Ordinary grouting materials have no radiation-proof effect and therefore cannot meet its grouting repair needs. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem that the present invention intends to solve is to provide a modified radiation-proof powder and a radiation-proof concrete crack repair grouting material. The grouting material is a grouting repair material with radiation protection function, which can not only repair the strength of the radiation-proof concrete structure but also have the radiation protection function.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] In a first aspect, the present invention provides a modified radiation-proof powder, wherein the preparation process of the modified radiation-proof powder is:

[0007] 1) Uniformly distributing a micron-sized radiation-proof powder with monodispersity into a high-speed airflow, a composite modifier is atomized by spraying, and two airflows are counter-mixed; the mass composition of the composite modifier is: 20-40% of a film-forming agent, 20-40% of a polyamide wax, 10-20% of a silane coupling agent as solutes, and 20-40% of a mixture of alcohols and ketones as a solvent; after mixing, the composite modifier is adsorbed on the surface of the radiation-proof powder to form a coating film;

[0008] 2) High-temperature gas is introduced into the mixed gas flow to evaporate the solvent in the coating film, so that the solute in the composite modifier is wrapped on the surface of the radiation-proof powder in the form of a film;

[0009] 3) The radiation-proof powder obtained in step 2) is collected by a bag dust collector, and then water-selected to remove impurities, and then dried to obtain modified radiation-proof powder.

[0010] The particle size of the monodisperse micron-level radiation-proof powder is no more than 50 microns, and preferably the particle size is 10-20 μm.

[0011] The boiling point range of the alcohol is 100-150°C; the ketone is a strong dissolving ketone with an applicable boiling point range below 100°C; the alcohol is at least one of n-butanol, isobutanol, amyl alcohol, and sec-amyl alcohol; the congener is at least one of acetone, butanone, 2-pentanone, and 3-pentanone;

[0012] The solvent is a mixture of n-butanol and acetone, and the mass ratio of n-butanol to propanol is (0.5-2):1 based on the total mass of the composite modifier.

[0013] The film-forming agent is at least one of polyphenylene acrylic acid, polychloroacrylic acid, polyacrylic acid, polypropylene alcohol, and maleic acid;

[0014] The high-pressure gas used when the composite modifier is atomized is 5-10MPa high-pressure gas;

[0015] The lowest temperature of the high temperature gas in step 2) is higher than the boiling point of the solvent used, and the highest temperature is lower than the destruction temperature of the film-forming agent after film formation, and the temperature of the high temperature gas is between 130-180°C;

[0016] The bag dust collector is used for powder collection, and two or more stages of dust collection equipment are provided according to the bag collection efficiency, or a multi-stage configuration of dust collection equipment including a comprehensive cyclone dust collector and an electrostatic dust collector;

[0017] The powder collected by the bag dust collector during water separation contains modifier particles that have not wrapped the radiation-proof powder, and the density of the modifier particles is less than 1g / cm 3 , floating on the surface of water; the density of the modified radiation-proof powder is 8-9g / cm 3 , sinks under water, and uses density difference to remove impurities.

[0018] The modified radiation-proof powder obtained in step 3) is subjected to powder sieving, and is screened using 325-mesh and 110-mesh sieves. Powders passing through the 325-mesh sieve are superior products, powders not passing through the 325-mesh sieve but passing through the 110-mesh sieve are good products, and powders not passing through the 110-mesh sieve are inferior products.

[0019] In a second aspect, the present invention provides a radiation-proof concrete crack repair grouting material, comprising the following raw materials in parts by weight:

[0020]

[0021] The modified radiation-proof powder is composed of radiation-proof powder coated with a modifier film, and the modifier film can swell in the presence of an active diluent in component A and then adhere to the epoxy resin system.

[0022] The modifier film is obtained by treating a composite modifier, wherein the composite modifier comprises: 20-40% of a film former, 20-40% of a polyamide wax, 10-20% of a silane coupling agent, and 20-40% of a solvent; the solvent is a mixture of alcohols and ketones;

[0023] The active diluent in the grouting material is an AGE or BGE type active diluent; the epoxy resin is NPEL-128 epoxy resin or 128 epoxy resin; the epoxy curing agent is a modified alicyclic epoxy curing agent;

[0024] The radiation-proof powder is at least one of lead oxide powder, lead sulfide powder, lead carbonate powder, lead powder, and ultrafine barium sulfate;

[0025] The rheological additive is at least one of fumed silica and organic bentonite;

[0026] The defoamer is at least one of a polyether defoamer, a silicone defoamer, and a polyether-modified silicone defoamer, preferably a silicone defoamer.

[0027] The preparation steps of the grouting material are as follows:

[0028] According to the ratio of the raw materials in the formula, the epoxy resin is sequentially added with a reactive diluent, a defoamer, a dispersant, a rheological additive, and an interface modifier under stirring to prepare component A;

[0029] The epoxy curing agent is used as the B component, or the epoxy curing agent and the accelerator are mixed to obtain the B component;

[0030] Mixing the materials in component C to obtain component C;

[0031] Mix component A and component B, stir until they are uniform, and add component C while stirring; after stirring evenly, let it stand to defoam, and it can be used after standing for 3-10 minutes without obvious bubbles;

[0032] Components A, B and C are all prefabricated at the factory.

[0033] In a third aspect, the present invention provides a radiation-proof concrete crack repair grouting material, comprising the following raw materials in parts by weight:

[0034]

[0035]

[0036] The modified radiation-proof powder is composed of radiation-proof powder coated with a modifier film, and the modifier film can swell in the presence of an active diluent in component A and then adhere to the epoxy resin system.

[0037] The radiation-proof concrete crack repair grouting material is evaluated by the radiation-proof repair rate of the grouting material, and the radiation-proof repair rate of the intact radiation-proof concrete is 100% as the basis for evaluation;

[0038] A fixed-size radiation-proof cavity is set up with a built-in radiation source; two types of test plates with exactly the same size and material, one of which is a seamless test plate, and the other is a seamed test plate with two 1mm-wide seams. Both test plates are radiation-proof plates, and their sizes match the diameter of the radiation-proof cavity. After filling with grouting material, a repaired test plate is formed;

[0039] During the test, the radiation cavity is sealed with a repaired test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain the radiation value t1; the radiation cavity is sealed with a seamless test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain t0; the radiation cavity is sealed with an unrepaired seam test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain t2;

[0040] Then the radiation protection repair rate = (t2-t1) / (t2-t0);

[0041] The compressive strength after grouting is much greater than that of the original radiation-proof concrete building, and the radiation-proof repair rate is above 70%.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The action mechanism of the modified radiation-proof powder in the grouting material of the present invention is as follows: after the modified radiation-proof powder is added to the epoxy resin and the active diluent, the modifier film covering the radiation-proof powder contacts the active diluent, the modifier film swells, and a micro-network structure is formed in the epoxy resin and the curing agent, thereby preventing the radiation-proof powder from sinking, thereby solving the problem that the high-density radiation-proof powder cannot be stably suspended in the epoxy grouting material and sinks too quickly.

[0044] The present invention uses epoxy resin and epoxy curing agent as main gelling materials. The larger the specific surface area of ​​the modified radiation-proof powder, the greater the oil absorption. After being added into the epoxy system, the viscosity of the slurry will increase. At the same time, the system effect of active diluent, defoaming agent and dispersant is coordinated to ensure the fluidity of the slurry and the compression, tension and bonding strength of the grouting material, so that the modified radiation-proof powder can be evenly distributed in the system, ensuring the density of the slurry.

[0045] The grouting material of the present invention has a suitable formula consistency, can have good permeability and radiation protection performance, and will not affect the strength performance of the radiation protection building itself; after the grouting material of the present invention is used, the phenomenon of blocking the grouting tool can be avoided, and the occurrence of grouting stratification can be reduced, and better radiation performance can be obtained under the same conditions. DETAILED DESCRIPTION

[0046] The present invention is further explained below in conjunction with embodiments, but this is not intended to limit the scope of protection of the present application.

[0047] The present invention discloses a radiation-proof concrete crack repair grouting material, comprising the following raw materials in parts by weight:

[0048]

[0049]

[0050] The modified radiation-proof powder is composed of radiation-proof powder coated with a modifier film, and the modifier film can swell in the presence of an active diluent in component A and then adhere to the epoxy resin system.

[0051] A method for preparing a modified radiation-proof powder, using a physical-chemical airflow impact method for surface modification, the process of the preparation method is:

[0052] 1) Uniformly distributing a micron-sized radiation-proof powder with monodispersity into a high-speed airflow, a composite modifier is atomized by spraying, and two airflows are counter-mixed; the mass composition of the composite modifier is: 20-40% of a film-forming agent, 20-40% of a polyamide wax, 10-20% of a silane coupling agent as solutes, and 20-40% of a mixture of alcohols and ketones as a solvent; after mixing, the composite modifier is adsorbed on the surface of the radiation-proof powder to form a coating film;

[0053] The alcohol is selected to be able to dissolve the solute; the boiling point of the alcohol should not be too high or too low. If the boiling point is too low, the composite modifier will solidify early during the spraying process and cannot achieve the coating effect. The boiling point range of the applicable alcohol is 100-150°C; the ketone is selected to have strong solubility, and the applicable boiling point range is below 100°C; after mixing, the composite modifier is adsorbed on the surface of the radiation-proof powder to form a coating film;

[0054] 2) High-temperature gas is introduced into the mixed gas flow to evaporate the solvent in the coating film, so that the solute in the composite modifier is wrapped on the surface of the radiation-proof powder in the form of a film;

[0055] 3) The modified radiation-proof powder is collected by a bag dust collector, and the collected modified radiation-proof powder is subjected to water selection to remove impurities, and then dried to obtain the modified radiation-proof powder.

[0056] The modified radiation-proof powder is subjected to powder screening. The powder screening adopts 325 mesh (45 μm) and 110 mesh (120 μm) sieves to screen the modified radiation-proof powder. The powder that passes through 325 mesh (45 μm) is a superior product, and the powder that does not pass through 325 mesh sieve but passes through 110 mesh sieve is a good product. The powder that does not pass through 110 mesh (120 μm) is a defective product. Different mesh sieves can also be selected for screening according to actual needs to select modified powders with appropriate particle sizes. According to actual needs, powders with a particle size of 50 microns can be selected as the preferred material, and powders larger than 50 microns can also be used according to repair needs.

[0057] The solvent is at least one of n-butanol and acetone, preferably 10-30% of n-butanol and 10-30% of acetone as solvents, wherein both are calculated based on the overall mass of the composite modifier.

[0058] The high-pressure gas used for atomizing the composite modifier is 5-10MPa high-pressure gas, including but not limited to 5MPa, 6MPa, 8MPa, 9MPa, 8.5MPa, 7.5MPa, etc. The higher the gas pressure, the higher the solvent content required in the composite modifier ratio, and the solvent plays a role in reducing viscosity and improving wettability to the powder.

[0059] The lowest temperature of the high temperature gas should be higher than the boiling point of the solvent used, and the highest temperature should be lower than the destruction temperature of polyacrylic acid or the film-forming material used after film formation. The temperature of the high temperature gas is preferably between 130-180°C.

[0060] The bag dust collector is used for collecting powders. According to the bag collection efficiency, two-stage or multi-stage dust collecting equipment can be set, or a multi-stage dust collecting equipment such as a cyclone dust collector and an electrostatic dust collector can be integrated.

[0061] The modified powder collected by the dust collector contains modifier particles that have not wrapped the radiation-proof powder, and the density of the modifier particles is less than 1g / cm 3 , floating on the surface of water. The density of the modified radiation-proof powder is 8-9g / cm 3 , sinks under water, and uses density difference to remove impurities.

[0062] The active diluent in the grouting material is preferably an AGE or BGE type active diluent with strong viscosity reducing ability.

[0063] The resin material is NPEL-128 epoxy resin with excellent comprehensive performance, matched with modified alicyclic epoxy curing agent, which has good fluidity, can fill the ends of the cracks densely, has high strength, and the compressive strength can be adjusted within the range of 60-120MPa as required.

[0064] The modified radiation-proof powder uses the radiation-proof properties of elements such as lead and barium to add radiation-proof function to the slurry. The radiation-proof powder can be selected from at least one of lead oxide powder, lead sulfide powder, lead carbonate powder, lead powder, etc., and ultrafine barium sulfate can also be added. The smaller the particle size of the modified radiation-proof powder, the greater the specific gravity, and the better the radiation-proof effect.

[0065] The rheological additive is preferably fumed silica, organic bentonite, or the like.

[0066] The mass composition of the composite modifier is: 20-40% of film former, 20-40% of polyamide wax, 10-20% of silane coupling agent, and 20-40% of solvent; the solvent is a mixture of alcohols and ketones;

[0067] The film-forming agent is at least one of polyphenylene acrylic acid, polychloroacrylic acid, polyacrylic acid, polypropylene alcohol, and maleic acid;

[0068] The alcohol is at least one of n-butanol, isobutanol, amyl alcohol and sec-amyl alcohol; the congener is at least one of acetone, butanone, 2-pentanone and 3-pentanone.

[0069] The defoamer is at least one of a polyether defoamer, a silicone defoamer, and a polyether-modified silicone defoamer, preferably a silicone defoamer.

[0070] According to the crack status of radiation-proof concrete, if the cracks have existed for a long time or there are dust and other debris, appropriate amounts of silane coupling agent and wetting aid can be added to enhance the material's ability to penetrate the cracks and its adhesion to the concrete interface.

[0071] Without violating the technical purpose of the present invention, the grouting material formula of the present invention can also be combined with other radiation-proof fillers and epoxy system commonly used regulating additives in the art. All of them are within the protection scope of the present invention, and the present invention does not make specific limitations on this.

[0072] The preparation steps of the grouting material of the present invention are as follows:

[0073] According to the ratio of the raw materials in the formula, the epoxy resin is sequentially added with a reactive diluent, a defoamer, a dispersant, a rheological additive, and an interface modifier under stirring to prepare component A;

[0074] The epoxy curing agent is used as the B component, or the epoxy curing agent and the accelerator are mixed to obtain the B component;

[0075] Mix the materials in component C to obtain component C; if component C is two or more modified radiation-proof powders, the powders must be premixed first, and this step is prefabricated at the factory;

[0076] Mix component A and component B, stir until they are uniform, and add component C while stirring; after stirring evenly, let it stand to defoam, and it can be used after standing for 3-10 minutes without obvious bubbles;

[0077] Components A, B and C can be prefabricated at the factory or prepared on site according to the site environment.

[0078] Example 1

[0079]

[0080]

[0081] The modified lead powder is obtained by modification using a composite modifier consisting of 20% polyphenylene acrylic acid, 30% polyamide wax, 10% silane coupling agent, 20% solvent n-butanol and 20% acetone.

[0082] The preparation process of the grouting material in this embodiment is:

[0083] Step 1: According to the raw material ratio, add active diluent, defoamer, dispersant to the epoxy resin in component A in sequence under stirring, and gradually add fumed silica and interface modifier under slow stirring to prevent too many bubbles from being stirred in. This step is prefabricated at the factory.

[0084] Step 3: Mix component A and component B and stir until they are uniform. Add component C while stirring. Continue stirring for 3-5 minutes after adding. Stop stirring and let it sit for 3-5 minutes to mature and defoam. It can be used when there are no obvious bubbles.

[0085] Example 2

[0086]

[0087] This embodiment is suitable for cracks with a width of less than 1 mm and has good permeability to fine cracks. The preparation process is the same as that of Example 1.

[0088] Example 3

[0089]

[0090] This embodiment is used in a low temperature environment of 0-5°C. The preparation process is the same as that of Example 1, except that the modified cyclic epoxy curing agent in component B is slowly added with reaction accelerator K54 under stirring conditions, and can be used after stirring. Component B is prefabricated at the factory or added on site according to construction conditions.

[0091] Example 4

[0092]

[0093] This embodiment is suitable for larger cracks or wider engineering joints.

[0094] Example 5

[0095]

[0096] This embodiment is suitable for brushing and moistening repair of tiny cracks or tiny network cracks.

[0097] The modified radiation-proof powder used in the present invention is not limited to lead-containing or barium-containing compounds. Other powders with radiation-proof function can be modified by the powder modification method of the present invention and applied to radiation-proof concrete crack repair grouting materials.

[0098] The radiation protection repair performance of the radiation protection concrete crack repair grouting material of the present invention is evaluated by the radiation protection repair rate, and the radiation protection repair rate of the intact radiation protection concrete is 100% as the basis for evaluation. The original radiation protection concrete building targeted by the following embodiment data is the same.

[0099] Evaluation method: set up a fixed-size radiation-proof cavity with a built-in radiation source; two types of test plates with exactly the same size and material, one of which is a seamless test plate, and the other is a seamed test plate with two 1mm-wide seams. Both test plates are radiation-proof plates with sizes matching the diameter of the radiation-proof cavity, and the grouting material is filled to form a repaired test plate;

[0100] During the test, the radiation cavity is sealed with a repaired test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain the radiation value t1; the radiation cavity is sealed with a seamless test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain t0; the radiation cavity is sealed with an unrepaired seam test plate, and the radiation value outside the plate is detected by a radiation detection instrument to obtain t2;

[0101] Then the radiation protection repair rate = (t2-t1) / (t2-t0);

[0102] Test Data

[0103]

[0104] The test data of the examples of the present application are shown in the table above. The temperature, initial viscosity and operable time of each example in the table refer to the test values ​​of the grouting material, and the compressive strength and bonding strength refer to the bonding strength of the entire radiation-proof building after repair. The compressive strength of the grouting material after repair in the examples of the present application is much greater than the compressive strength of the original radiation-proof concrete building. At the same time, the radiation-proof repair rate of the examples is above 70%, while the conventional ordinary repair slurry (only adding non-modified radiation-proof powder on the basis of Example 2) has significantly poor radiation-proof performance when the strength meets the requirements.

[0105] Embodiment 6-9

[0106] This embodiment uses a different film-forming agent based on the embodiment 1, and the modification method is the same. The film-forming agent is polychloroacrylic acid, polyacrylic acid, polypropylene alcohol or maleic acid.

[0107] Example 10

[0108] This embodiment has the same ratio of composite modifier and modification method as that of Embodiment 1. The mass composition of the composite modifier is: 30% film-forming agent, 20% polyamide wax, 15% silane coupling agent, and 35% solvent; the solvent is isobutanol, 2-pentanone, and 3-pentanone prepared in a ratio of 1:1:1.

[0109] Embodiment 11

[0110] This embodiment has the same ratio of composite modifier and modification method as that of Embodiment 1. The mass composition of the composite modifier is: 25% film-forming agent, 40% polyamide wax, 10% silane coupling agent, and 25% solvent; the solvent is n-butanol, acetone, and 3-pentanone prepared in a ratio of 2:1:1.

[0111] The grouting material of the embodiment of the present invention can ensure that the radiation-proof powder does not settle and also has appropriate penetration ability.

[0112] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A radiation-proof concrete crack repair grouting material, comprising the following raw materials in parts by weight: Component A epoxy resin 100-200 parts Active diluent 10-40 parts Defoaming agent 0.15-1 part Dispersant 1-3 parts Rheological additive 0-1 part Interface modifier 0-4 parts Component B epoxy curing agent 33-80 parts Accelerator 0-20 parts 500-2500 parts of modified radiation-proof powder of component C; The modified radiation-proof powder is composed of radiation-proof powder coated with a modifier film, and the modifier film can swell in the presence of the active diluent in component A and then adhere to the epoxy resin system; The preparation process of the modified radiation-proof powder is: 1) Uniformly distributing the monodisperse micron-sized radiation-proof powder into a high-speed airflow, a composite modifier is atomized by spraying, and two airflows are counter-mixed; the mass composition of the composite modifier is: 20-40% of a film-forming agent, 20-40% of a polyamide wax, 10-20% of a silane coupling agent as solutes, and 20-40% of a mixture of alcohols and ketones as a solvent; after mixing, the composite modifier is adsorbed on the surface of the radiation-proof powder to form a coating film; 2) High-temperature gas is introduced into the mixed gas flow to evaporate the solvent in the coating film, so that the solute in the composite modifier is wrapped on the surface of the radiation-proof powder in the form of a film; 3) The radiation-proof powder obtained in step 2) is collected by a bag dust collector, and then water-selected to remove impurities, and then dried to obtain modified radiation-proof powder.

2. The radiation-proof concrete crack repair grouting material according to claim 1 is characterized in that: The particle size of the monodisperse micron-grade radiation-proof powder is no more than 50 microns.

3. The radiation-proof concrete crack repair grouting material according to claim 1 is characterized in that: The particle size of the monodisperse micron-sized radiation-proof powder is 10-20 μm.

4. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The boiling point range of the alcohol is 100-150° C.; the ketone is a strong dissolving ketone with an applicable boiling point range below 100° C.; the alcohol is at least one of n-butanol, isobutanol, amyl alcohol, and secondary amyl alcohol; the ketone is at least one of acetone, butanone, 2-pentanone, and 3-pentanone.

5. The radiation-proof concrete crack repair grouting material according to claim 4 is characterized in that: The solvent is a mixture of n-butanol and acetone, and the mass ratio of n-butanol to acetone is (0.5-2):1 based on the total mass of the composite modifier.

6. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The film-forming agent is at least one of polyphenylene acrylic acid, polychloroacrylic acid, polyacrylic acid, polypropylene alcohol, and maleic acid; The high-pressure gas used when the composite modifier is atomized is 5-10MPa high-pressure gas; The lowest temperature of the high temperature gas in step 2) is higher than the boiling point of the solvent used, and the highest temperature is lower than the destruction temperature of the film-forming agent after film formation, and the temperature of the high temperature gas is between 130-180°C; The bag dust collector is used for powder collection, and two or more stages of dust collection equipment are provided according to the bag collection efficiency, or a multi-stage configuration of dust collection equipment including a comprehensive cyclone dust collector and an electrostatic dust collector; The powder collected by the bag dust collector during water separation contains modifier particles that have not wrapped the radiation-proof powder, and the density of the modifier particles is less than 1g / cm 3 , floating on the surface of water; the density of the modified radiation-proof powder is 8-9g / cm 3 , sinks under water, and uses density difference to remove impurities.

7. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The modified radiation-proof powder obtained in step 3) is subjected to powder sieving, and is screened using 325-mesh and 110-mesh sieves. Powders passing through the 325-mesh sieve are superior products, powders not passing through the 325-mesh sieve but passing through the 110-mesh sieve are good products, and powders not passing through the 110-mesh sieve are inferior products.

8. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The active diluent in the grouting material is an AGE or BGE active diluent; the epoxy resin is 128 epoxy resin; the epoxy curing agent is a modified alicyclic epoxy curing agent; The radiation-proof powder is at least one of lead oxide powder, lead sulfide powder, lead carbonate powder, lead powder, and ultrafine barium sulfate; The rheological additive is at least one of fumed silica and organic bentonite; The defoamer is at least one of a polyether defoamer, a silicone defoamer, and a polyether-modified silicone defoamer.

9. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The preparation steps of the grouting material are as follows: According to the ratio of the raw materials in the formula, the epoxy resin is sequentially added with a reactive diluent, a defoamer, a dispersant, a rheological additive, and an interface modifier under stirring to prepare component A; The epoxy curing agent is used as the B component, or the epoxy curing agent and the accelerator are mixed to obtain the B component; Mixing the materials in component C to obtain component C; Mix component A and component B, stir until they are uniform, and add component C while stirring; after stirring evenly, let it stand to defoam, and it can be used after standing for 3-10 minutes without obvious bubbles; Components A, B and C are all prefabricated at the factory.

10. The radiation-proof concrete crack repair grouting material according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: Component A epoxy resin 150-200 parts Active diluent 10-40 parts Defoaming agent 0.15-1 part Dispersant 1-3 parts Rheological additive 0.1-1 part Interface modifier 0-4 parts Component B epoxy curing agent 33-80 parts Accelerator 0-20 parts Component C modified radiation-proof powder 700-2000 parts.

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