Preparation method and application of ceramsite composition, ceramsite and ceramsite repairing agent

Abstract

The invention belongs to the technical field of repairing material processing, the embodiment of the invention provides a ceramsite composition, ceramsite and a preparation method and application of a ceramsite repairing agent, and the ceramsite composition comprises the following raw materials in parts by weight: 300-1200 parts of coal gangue powder, 150-600 parts of calcined coal gangue powder, 50-200 parts of mineral powder, 100-400 parts of a pore forming agent and 50-200 parts of a binder. The ceramsite prepared from the ceramsite composition provided by the embodiment of the invention has higher saturated water absorption rate, so that the ceramsite per unit volume can adsorb a repairing agent with higher volume, and self-repairing of building cracks is facilitated.

Description

Technical Field

[0001] The present application belongs to the technical field of repair material processing, and more specifically, to a preparation method and use of a ceramsite composition, ceramsite and a ceramsite repair agent. Background Art

[0002] Under the influence of external loads and environmental factors, damage or cracks will inevitably appear inside the concrete. Without any repair work, it will lead to the deterioration of concrete, thereby reducing the service life of concrete. Regular manual maintenance is an important means to repair cracks and extend the service life of concrete structures. However, for large-scale infrastructure, the cost of manual maintenance is high. Therefore, self-repair of building materials is often achieved by adding repair materials to building materials.

[0003] In the related art, expanded clay used as a repair material often has a low water absorption rate and is difficult to absorb a sufficient amount of repair agent, thus affecting the self-repairing effect of the building material. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a preparation method and use of a ceramsite composition, ceramsite and a ceramsite repair agent to improve the water absorption rate of ceramsite.

[0005] In a first aspect, an embodiment of the present application provides a ceramsite composition, comprising the following raw materials in parts by weight:

[0006] 300-1200 parts of coal gangue, 150-600 parts of calcined coal gangue, 50-200 parts of ore, 100-400 parts of pore former and 50-200 parts of binder.

[0007] Furthermore, the calcined coal gangue is obtained by calcining the coal gangue at 600-1000° C. for 1.5-2.5 hours.

[0008] Furthermore, the ore includes one or more of metal ore, stone ore and industrial silicon slag; and / or the pore-forming agent is one or more of sawdust, straw chips, calcium carbonate, magnesium carbonate, activated carbon, starch, polyvinyl alcohol, ammonium bicarbonate, calcium carbonate, magnesium oxide, zinc oxide, potassium hydroxide and zinc chloride, and / or the binder is one or more of silicate, calcined alumina, zirconium oxide and silicon carbide.

[0009] In a second aspect, an embodiment of the present application provides a method for preparing ceramsite, comprising:

[0010] The powdered coal gangue, calcined coal gangue, ore, pore former and binder in the composition are mixed and granulated to obtain a ceramsite matrix;

[0011] The ceramsite matrix is ​​calcined to obtain ceramsite.

[0012] Further, the ceramsite matrix is ​​calcined to obtain ceramsite; comprising:

[0013] The ceramsite matrix is ​​subjected to a first calcination treatment to remove moisture from the ceramsite matrix to obtain a first ceramsite matrix;

[0014] The first ceramsite matrix is ​​subjected to a second calcination treatment to form pores in the first ceramsite matrix to obtain a second ceramsite matrix;

[0015] The second ceramsite substrate is subjected to a third calcination treatment to remove residual pore formers.

[0016] In some embodiments, the first calcination treatment includes: heating from room temperature to 130-160° C., and maintaining the temperature at 130-160° C. for 30-60 minutes, wherein the heating time is more than 20 minutes;

[0017] The second calcination treatment includes: after the first calcination treatment, heating from 130-160°C to 700-900°C and keeping at 700-900°C for 1.5-2.5 hours, and the heating time is 1.5-2.5 hours;

[0018] The third calcination treatment includes: after the second calcination treatment, heating from 700-900° C. to 1100-1200° C. and keeping the temperature at 1100-1200° C. for 40-80 minutes, and the heating time is 20-40 minutes.

[0019] Further, the second ceramsite matrix is ​​subjected to a third calcination treatment to remove residual pore-forming agent; comprising:

[0020] The second ceramsite matrix is ​​subjected to a third calcination treatment and then maintained at a constant temperature and humidity of 60-80° C. at a relative humidity of 16-24° C. to obtain ceramsite.

[0021] In a third aspect, the present application provides a method for preparing a ceramsite repair agent, comprising:

[0022] The ceramsite obtained by the above preparation method is adsorbed with the repairing agent to obtain the repaired ceramsite;

[0023] The repaired ceramsite is wrapped with a wrapping agent to obtain wrapped ceramsite;

[0024] The coated ceramsite is coated with an interface repair agent to obtain a ceramsite repair agent.

[0025] Further, the repaired ceramsite is packaged with a packaging agent to obtain packaged ceramsite; comprising:

[0026] The repaired ceramsite is wrapped with an epoxy resin wrapping agent, and the wrapped ceramsite is obtained after curing; wherein the epoxy resin wrapping agent is prepared by mixing epoxy resin, butyl glycidyl ether and a curing agent, and the mass ratio of the epoxy resin to the butyl glycidyl ether is 1:(0.05-0.15); the mass ratio of the epoxy resin to the curing agent is 1:(0.7-1.2);

[0027] Further, the coated ceramsite is coated with an interface repair agent to obtain a ceramsite repair agent; comprising:

[0028] The cement repair agent is evenly attached to the outer surface of the coated ceramsite to obtain the ceramsite repair agent; wherein the cement repair agent is prepared by mixing cement and dibasic calcium phosphate dihydrate, and the mass ratio of cement to dibasic calcium phosphate dihydrate is (8.5-9.5):(0.5-1.5);

[0029] Furthermore, the repair agent is a carbonate solution.

[0030] In a fourth aspect, the embodiments of the present application provide a ceramsite composition or ceramsite prepared by a preparation method or a ceramsite repair agent prepared by a preparation method for use in repairing cracks in buildings.

[0031] The first aspect of the present application provides a ceramsite composition using coal gangue, calcined coal gangue, ore, and pore-forming agent as raw materials, bonding the raw materials with a binder to form, and calcining to form ceramsite. In the production process of ceramsite, the pore-forming agent disappears after calcination, while the pore-forming agent remains, thereby generating a large number of voids in the ceramsite, so that the ceramsite made of the ceramsite composition has a higher saturated water absorption rate, so that the unit volume of ceramsite can absorb a higher volume of repair agent, which is beneficial to the self-repair of building cracks.

[0032] The second aspect of the present application provides a method for preparing ceramsite, which prepares the composition into ceramsite by granulation and calcination. When preparing ceramsite in batches, the size of each ceramsite can be easily controlled through the granulation step to make the size of each ceramsite uniform. Therefore, when multiple ceramsites are stacked as repair materials, the stacking space can be fully utilized, which is beneficial to improve the saturated water absorption rate of the repair material and facilitate the self-repair of building cracks; calcining the ceramsite matrix after granulation helps to make the ceramsite have enough internal voids and sufficiently high compressive strength.

[0033] The third aspect of the present application provides a ceramsite repair agent, which is packaged after the ceramsite adsorbs the repair agent, thereby avoiding the volatilization and loss of the adsorbent in the ceramsite under natural conditions, and improving the interface compatibility between the ceramsite repair agent and building materials, which is beneficial to the self-repair of building cracks.

[0034] The fourth aspect of the present application provides a use in which the ceramsite composition, ceramsite or ceramsite repairing agent can be used in the repair of various building cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 The present invention is a schematic diagram of the process of preparing ceramsite.

[0037] Figure 2 The present invention is a schematic diagram of the process flow of the calcination treatment method of the ceramsite matrix.

[0038] Figure 3 The present invention is a schematic diagram of the process of preparing expanded clay repair agent.

[0039] Figure 4 This is a schematic diagram of the structure of expanded clay repair agent.

[0040] Figure 5 The present invention is a schematic flow chart of a method for preparing a ceramsite repair agent according to an embodiment.

[0041] The corresponding reference numerals in the accompanying drawings are:

[0042] 1-first cement kernel, 2-first epoxy resin layer, 3-first cement layer, 101-mixed powder, 102-pore former, 103-cement test mill, 104-disc granulator, 105-binder, 106-water, 107-raw material ball, 108-standard sieve, 109-first curing box, 110-curing ball, 111-muffle furnace, 112-cement, 113-second curing box, 114-repairing liquid, 115-epoxy resin coating agent, 116-cement repairing agent, 117-third curing box, 118-repaired cement. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] In the embodiments of the present application, it should be understood that the building is not limited to buildings made of concrete materials, but may also be buildings made of other materials.

[0045] Under the influence of external loads and environmental factors, damage or cracks will inevitably appear inside the building. The cost of manual maintenance is high.

[0046] Adding self-repairing materials to building materials is a good way to solve building damage or cracks. The self-repairing materials can "sense" the cracks or damage of building materials and self-repair the cracks, which can greatly reduce the cost of manual intervention in building damage repair. This "perception" works like this: building materials will crack when they are subjected to pressure that exceeds their own compressive strength. This pressure will also cause the repair material to rupture, so that the repair agent inside the repair material will flow to the cracks in the building material for repair. For example, self-repairing concrete made by adding repair materials to concrete can self-repair cracks when concrete is damaged or cracked, which can greatly reduce the cost of manual intervention in building damage repair.

[0047] However, the ceramsite used as repair material in the related art has a low saturated water absorption rate and often does not fully utilize solid waste and idle natural mineral resources, thus failing to solve the environmental problems caused by solid waste and idle natural mineral resources.

[0048] The production and storage of coal gangue in my country has reached 7 billion tons, and the annual discharge is increasing at a rate of 150 million tons. The long-term storage and annual discharge of coal gangue not only occupies a large amount of farmland, land and cultivated land, but also pollutes the soil and water.

[0049] Existing expanded clay mostly uses natural materials such as clay and shale. In order to avoid the depletion of non-renewable natural resources caused by over-exploitation, the current problems of small dosage, low product performance and low added value of coal gangue in the process of resource utilization such as preparation of expanded clay seriously limit its large-scale utilization.

[0050] In order to improve or solve the above technical problems to a certain extent and increase the saturated water absorption rate of ceramsite, in a first aspect, an embodiment of the present application provides a ceramsite composition, comprising the following raw materials in parts by weight:

[0051] 300-1200 parts of coal gangue, 150-600 parts of calcined coal gangue, 50-200 parts of ore, 100-400 parts of pore former and 50-200 parts of binder.

[0052] In the composition of the embodiment of the present application, the coal gangue is 300-1200 parts. In some embodiments, the coal gangue can also be 300 parts, 400 parts, 500 parts, 600 parts, 700 parts, 800 parts, 900 parts, 1000 parts, 1100 parts or 1200 parts, etc. This is only an example and is not limited. The use of coal gangue can reduce the pollution of coal gangue to the environment, and the coal gangue has sufficient strength and is less than the strength of the building material, which is conducive to improving the compressive strength of ceramsite, so that when ceramsite is added to the building material as a repair material, the compressive strength of the building material is avoided. Reduced.

[0053] In the composition of the embodiment of the present application, the calcined coal gangue is 150-600 parts. In some embodiments, the calcined coal gangue can also be 150 parts, 200 parts, 250 parts, 300 parts, 350 parts, 400 parts, 450 parts, 500 parts, 550 parts or 600 parts. In some embodiments, the calcined coal gangue is obtained after calcining the coal gangue at 600-1000°C for 1.5-2.5 hours; the calcined coal gangue can also be obtained after calcining the coal gangue at 600°C, 800°C, 900°C or 1000°C for 1.5 hours, 1.8 hours, 2 hours, 2.2 hours or 2.5 hours. This is only an example and is not limited. Coal gangue and calcined coal gangue are used as the matrix of expanded clay, and the application of coal gangue in the preparation of expanded clay can be maximized. The use of calcined coal gangue can enhance the compressive strength and hardness of expanded clay, which is beneficial to avoid a significant reduction in the compressive strength of building materials when expanded clay is added to building materials as a repair material.

[0054] The composition of the embodiment of the present application contains 50-200 parts of ore. The ore includes one or more of metal ore, stone ore and industrial silicon slag; in some embodiments, the ore is ore powder; the ore powder can be iron ore powder, stone powder, industrial silicon slag powder, etc.; the ore can also be 50 parts, 100 parts, 120 parts, 150 parts, 180 parts or 200 parts, etc. This is only an example and is not limited. Ore powder and the like are highly active and can effectively improve the pelletizing rate of granulation. The use of ore can play a good buffering role on the contact surface between coal gangue and calcined coal gangue, thereby making the overall strength of the ceramsite more stable and avoiding the rupture of the ceramsite caused by unstable contact between coal gangue and calcined coal gangue.

[0055] The pore-forming agent in the composition of the embodiment of the present application is 100-400 parts. In some embodiments, the pore-forming agent can be sawdust, straw, calcium carbonate, magnesium carbonate, activated carbon, starch, polyvinyl alcohol, ammonium bicarbonate, calcium carbonate, magnesium oxide, zinc oxide, potassium hydroxide or zinc chloride, etc. This is only an example and is not limited here. Typically, the pore-forming agent is sawdust. When less sawdust is added, the water absorption rate is not significantly improved, and when too much sawdust is added, the strength of the ceramsite is greatly reduced. In some embodiments, the pore-forming agent can also be 100 parts, 120 parts, 150 parts, 180 parts, 220 parts, 250 parts, 280 parts, 330 parts, 350 parts, 380 or 400 parts, etc. The use of a pore-forming agent can produce a large number of voids in the mixed interface of coal gangue, calcined coal gangue and ore, and the use of high-temperature calcination pore-forming can improve the water absorption rate of ceramsite, so that the ceramsite has a higher water absorption rate.

[0056] The binder in the embodiment of the present application is 50-200 parts. In some embodiments, the binder can be silicate, calcined alumina, zirconium oxide or silicon carbide, etc. The binder can also be 50 parts, 100 parts, 120 parts, 150 parts, 180 parts or 200 parts. This is only an example and is not limited. The use of a binder can improve the bonding strength of coal gangue, calcined coal gangue, ore and pore-forming agent, so that the subsequently prepared ceramsite has good strength and hardness, meeting the requirements of building repair materials. Typically, the binder is sodium silicate. When there is less sodium silicate, the bonding effect is not ideal and the strength of the ceramsite is low. When there is more sodium silicate, the strength increase is not obvious, and the water absorption rate of the ceramsite may also be reduced.

[0057] The composition of the embodiment of the present application uses coal gangue, calcined coal gangue, ore, and pore-forming agent as raw materials, and the raw materials are bonded by a binder to form, and then calcined to form ceramsite. In the process of producing ceramsite, the pore-forming agent disappears after calcination, while the pore-forming agent remains, thereby generating a large number of voids in the ceramsite, so that the ceramsite made by the ceramsite composition has a higher saturated water absorption rate, so that the unit volume of ceramsite can absorb a higher volume of repair agent, which is beneficial to the self-repair of building cracks.

[0058] In a second aspect, the present invention provides a method for preparing ceramsite. Figure 1 As shown, including:

[0059] S1. The powdered gangue, calcined gangue, ore, pore-forming agent and binder in the composition are mixed and granulated to obtain a ceramsite matrix;

[0060] S2. calcining the ceramsite matrix to obtain ceramsite.

[0061] The preparation method of the embodiment of the present application adopts a granulation method to prepare expanded clay, which makes it easy to control the size of each expanded clay through the granulation step to make the size of each expanded clay uniform. Therefore, when multiple expanded clays are stacked as repair materials, the stacking space can be fully utilized, which is beneficial to improve the saturated water absorption rate of the repair material and facilitate the self-repair of building cracks; calcining the expanded clay matrix after granulation helps to make the expanded clay have enough internal voids and sufficiently high compressive strength.

[0062] In the embodiment of the present application, the ceramsite substrate is calcined to obtain ceramsite; Figure 2 As shown, including:

[0063] S21. The ceramsite substrate is subjected to a first calcination treatment to remove moisture from the ceramsite substrate to obtain a first ceramsite substrate;

[0064] S22. The first ceramsite substrate is subjected to a second calcination treatment to form pores in the first ceramsite substrate to obtain a second ceramsite substrate;

[0065] S23. performing a third calcination treatment on the second ceramsite substrate to remove residual pore-forming agent.

[0066] The preparation method of the embodiment of the present application adopts a three-stage calcination treatment method, namely a first calcination treatment, a second calcination treatment and a third calcination treatment. The first calcination treatment is used to remove moisture from the ceramsite matrix to avoid cracking of the ceramsite matrix due to uneven heating caused by moisture and to create a better reaction environment for the subsequent pore-forming agent to take effect; the second calcination treatment is used to make the pore-forming agent in the ceramsite react to produce a large number of voids in the ceramsite matrix; the third calcination treatment is used to make the residual pore-forming agent in the ceramsite further play a role, further produce a large number of voids, and improve the strength and hardness of the final ceramsite.

[0067] In an embodiment of the present application, the first calcination treatment includes: heating from room temperature to 130-160°C, and keeping at 130-160°C for 30-60 minutes, and the heating time is more than 20 minutes; in some embodiments, the first calcination treatment may include: heating from room temperature to 130°C, 135°C, 140°C, 145°C, 150°C, 155°C or 160°C, and keeping for 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes or 60 minutes, and the heating time is 20 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes or 60 minutes. This is only an example and not limited. The first calcination treatment uses a longer heating time, which can make the temperature difference between the inside and outside of the ceramsite matrix smaller, thereby avoiding the cracking of the ceramsite matrix caused by the evaporation of water. Using a calcination temperature of 130-160°C for 30-60 minutes helps the evaporation of water without destroying other components in the ceramsite matrix.

[0068] In an embodiment of the present application, the second calcination treatment includes: after the first calcination treatment, the temperature is raised from 130-160°C to 700-900°C, and kept at 700-900°C for 1.5-2.5 hours, and the heating time is 1.5-2.5 hours; in some embodiments, the second calcination treatment may include: after the first calcination treatment, the temperature is raised from 130°C, 135°C, 138°C, 142°C, 145°C, 152°C, 158°C or 160°C to 700°C, 720°C, 750°C, 800°C, 850°C or 900°C, and kept for 1.5 hours, 1.8 hours, 2.0 hours, 2.2 hours, 2.3 hours, 2.4 hours or 2.5 hours, and the heating time is 1.5 hours, 1.8 hours, 2.0 hours, 2.2 hours, 2.3 hours, 2.4 hours or 2.5 hours; this is only an example and not a limitation. The second calcination treatment uses a longer heating time, which helps the pore-forming agent and other components in the second ceramsite matrix to be heated evenly, so that the final void distribution is uniform; the use of 700-900°C insulation for 1.5-2.5 hours is conducive to the uniform and slow decomposition of the pore-forming agent, avoiding the drastic change in the internal structure of the ceramsite caused by high temperature, which squeezes or deforms the internal voids and causes a small number of voids or uneven void distribution.

[0069] In an embodiment of the present application, the third calcination treatment includes: heating from 700-900°C to 1100-1200°C after the second calcination treatment, and keeping at 1100-1200°C for 40-80 minutes, and the heating time is 20-40 minutes. In some embodiments, the third calcination treatment may include: heating from 700°C, 720°C, 740°C, 760°C, 780°C, 800°C, 850°C, 880°C or 900°C to 1100°C, 1120°C, 1140°C, 1160°C, 1180°C or 1200°C after the second calcination treatment, and keeping for 40 minutes, 50 minutes, 60 minutes, 70 minutes or 80 minutes; the heating time is 20 minutes, 25 minutes, 28 minutes, 30 minutes, 35 minutes or 40 minutes. This is only an example and not limited here. The third calcination treatment uses 1100-1200°C for 40-80 minutes, which helps to decompose all the residual pore-forming agents and makes the internal structure of the final ceramsite more stable, thereby ensuring the hardness and strength of the ceramsite.

[0070] In an embodiment of the present application, it also includes: after the second ceramsite matrix is ​​subjected to a third calcination treatment, it is subjected to constant temperature and humidity curing at a relative humidity of 16-24 and a temperature of 60-80°C to obtain ceramsite. In some embodiments, the relative humidity of the constant humidity can be 16, 18, 20, 22 or 24, and the constant temperature is 60°C, 65°C, 70°C, 75°C, 78°C or 80°C. This is only an example and is not limited. The use of constant temperature and humidity for curing helps to prevent the internal structure of the ceramsite from undergoing a drastic change due to a sudden change in the external environment when the ceramsite is cooled, thereby avoiding the problems of reduced voids, uneven distribution, and decreased hardness and strength of the ceramsite due to excessive internal and external temperature differences during the subsequent cooling process.

[0071] In a third aspect, the present application embodiment provides a method for preparing a ceramsite repair agent, referring to Figure 3 As shown, including:

[0072] S100. The ceramsite obtained by the preparation method is adsorbed with the repair agent to obtain repaired ceramsite;

[0073] It should be understood that the building is not limited to the building made of concrete materials, but can also be made of other materials; the ceramsite can be made into repair ceramsite according to the materials used in the building, and adsorb the repair agent suitable for repairing the building material, so as to facilitate the self-repair of the cracks in the building. For example, when the building material is concrete, the repair agent can be a carbonate solution.

[0074] S101. The repaired ceramsite is wrapped with a wrapping agent to obtain wrapped ceramsite;

[0075] The repaired expanded clay is wrapped with a coating agent, which is beneficial to maintaining the stability of the repair agent in the repaired expanded clay.

[0076] In some embodiments, the encapsulant may be a resin-based encapsulant.

[0077] In an embodiment of the present application, the repaired ceramsite is wrapped with a wrapping agent to obtain wrapped ceramsite; including: the repaired ceramsite is wrapped with an epoxy resin wrapping agent, and the wrapped ceramsite is obtained after curing; wherein the epoxy resin wrapping agent is made by mixing epoxy resin, butyl glycidyl ether and a curing agent, the mass ratio of epoxy resin to n-butyl glycidyl ether is 1:(0.05-0.15), and the mass ratio of epoxy resin to curing agent is 1:(0.7-1.2). In some embodiments, butyl glycidyl ether is n-butyl glycidyl ether or isobutyl glycidyl ether; optionally, butyl glycidyl ether is n-butyl glycidyl ether, and the mass ratio of epoxy resin to n-butyl glycidyl ether can be 1:0.05, 1:0.08, 1:0.10, 1:0.12 or 1:0.15. This is only an example and is not limited. Among them, the curing agent can be various epoxy resin curing agents, which are not limited here. The mass ratio of curing agent to epoxy resin can be 0.7:1, 0.8:1, 0.9:1, 1:1 or 1.2:1, etc., and the epoxy resin can be well cured on the outer layer of the repaired ceramsite. This is only an example and not a limitation. The above ratio of epoxy resin and n-butyl glycidyl ether can make the epoxy resin have good fluidity while maintaining good encapsulation, thereby avoiding the problem of uneven encapsulation caused by excessive viscosity of the epoxy resin.

[0078] S102. The coated ceramsite is coated with an interface repair agent to obtain a ceramsite repair agent.

[0079] In the embodiment of the present application, the interface repair agent is used to improve the interface incompatibility between the coated ceramsite and the building material, so that the coated ceramsite and the building material have better bonding. In some embodiments, when the building material is concrete, the interface repair agent can be cement or silicate.

[0080] In some embodiments, the coated ceramsite is coated with an interface repair agent to obtain a ceramsite repair agent; including: uniformly attaching a cement repair agent to the outer surface of the coated ceramsite to obtain a ceramsite repair agent; wherein the cement repair agent is made by mixing cement and dibasic calcium phosphate dihydrate, and the mass ratio of cement and dibasic calcium phosphate dihydrate is (8.5-9.5): (0.5-1.5). Exemplarily, the mass ratio of cement and dibasic calcium phosphate dihydrate can be 8.5:1.5, 9.0:1.0, 9.1:0.9, 9.2:0.8 or 9.5:0.5. This is only an example and is not limited. Using the above-mentioned ratio of cement and dibasic calcium phosphate dihydrate as a cement repair agent can avoid the adhesion between the various coated ceramsites and provide a calcium source on the outer surface of the ceramsite repair agent, so that the ceramsite repair agent can have better interface compatibility with concrete, which is beneficial to the self-repair of concrete.

[0081] The third aspect of the present application provides a ceramsite repair agent, which is packaged after the ceramsite adsorbs the repair agent, thereby avoiding the volatilization and loss of the adsorbent in the ceramsite under natural conditions, and improving the interface compatibility between the ceramsite repair agent and building materials, which is beneficial to the self-repair of building cracks.

[0082] In a fourth aspect, the embodiments of the present application provide a ceramsite composition or ceramsite prepared by a preparation method or a ceramsite repair agent prepared by a preparation method for use in repairing cracks in buildings.

[0083] The fourth aspect of the present application provides a use in which the expanded clay composition, expanded clay or expanded clay repairing agent can be used in the repair of various building cracks, thereby playing a self-repairing role on building cracks of various materials.

[0084] In a fifth aspect, an embodiment of the present application provides a repaired expanded clay having a core-shell structure; the inner core of the repaired expanded clay is expanded clay or expanded clay made of the above-mentioned composition.

[0085] In some embodiments, the first shell layer wrapped around the inner core is a wrapping layer, and the material of the wrapping layer is epoxy resin.

[0086] In the sixth aspect, an embodiment of the present application provides a ceramsite repair agent, wherein the repaired ceramsite has a core-shell structure, and the ceramsite repair agent includes repaired ceramsite; the outer shell of the first shell layer of the repaired ceramsite is a cement layer, and the cement layer is made of a cement repair agent; the cement repair agent is made by mixing cement and dihydrated calcium hydrogen phosphate, and the mass ratio of cement and dihydrated calcium hydrogen phosphate is (8.5-9.5):(0.5-1.5).

[0087] In an embodiment of the present application, the mass ratio of cement to dibasic calcium phosphate dihydrate can be 8.5:1.5, 9.0:1.0, 9.1:0.9, 9.2:0.8 or 9.5:0.5. This is for example only and is not limited. Adding an appropriate amount of dibasic calcium phosphate dihydrate to repair the ceramsite shell can not only serve as a calcium source for calcium ions, but also react with minerals in cement to form stable compounds, thereby improving the stability of the healing product and further improving the repair performance of the self-healing ceramsite. Thus, the above-mentioned proportion of cement and dibasic calcium phosphate dihydrate is used as a cement repair agent, which can avoid the adhesion between the various encapsulated ceramsites and provide a calcium source on the outer surface of the ceramsite repair agent, so that the ceramsite repair agent and concrete have better interface compatibility, which is beneficial to the self-repair of the concrete.

[0088] See also Figure 5 As shown, the preparation process of ceramsite repair agent includes:

[0089] a. The raw material gangue powder, the calcined gangue powder and the ore powder are mixed to obtain a mixed powder 101;

[0090] b. The mixed powder 101 and the pore-forming agent 102 are mixed in a cement test mill 103 and ground uniformly;

[0091] c. The powder obtained in b and the binder 105 and water 106 are granulated in a disc granulator 104 to obtain a raw ball 107;

[0092] d. The raw ball 107 is sieved with a standard sieve 108 and cured in a first curing box 109 to obtain a cured ball 110;

[0093] e. The curing ball 110 is calcined in a muffle furnace 111 to obtain ceramsite 112;

[0094] f. The ceramsite 112 is cured in the second curing box 113 to obtain cured ceramsite;

[0095] g. The curing ceramsite is adsorbed with the repair liquid 114 and then encapsulated with an epoxy resin wrapping agent 115;

[0096] h. The encapsulated ceramsite in g is rolled with a cement repair agent 116 and cured in a third curing box 117 to obtain a repaired ceramsite 118.

[0097] Exemplarily, the core process of preparing expanded clay repair agent may include five processes: disc granulation, calcination and pore formation, adsorption of carbonate repair agent and epoxy resin encapsulation, and powder rolling.

[0098] 1. Disc granulation: Weigh the various powders of coal gangue, calcined coal gangue, ore, pore-forming agent and binder according to the specific amount, pour them into the granulator and mix them evenly for 3-5 minutes. Then pour part of the stirred dry material mixture into the disc granulator. Next, spray water evenly in the granulator to make the dry material mixture in a pre-wetted state, and then put part of the raw materials into the granulator again, while continuing to sprinkle water and observe the rolling state of the mixture. Finally, continue to sprinkle the dry powder into the granulator. After about 5 minutes of granulation, turn off the instrument and stop granulation. Screen out the particles with the required particle size, put the remaining smaller particles back into the granulator to repeat the above process and continue granulation. Store the sieved particles in a constant temperature and humidity curing box with a relative humidity of 95 and a temperature of 35°C for 28 days before calcination.

[0099] 2. Calcination and hole making: There are three main stages for calcination and hole making in a muffle furnace. First, the furnace temperature is raised from room temperature to 150°C for 30 minutes, and kept at 150°C for 40 minutes. This process is mainly to remove the moisture of the raw material balls to prevent the raw material balls from exploding and contaminating the furnace at a higher subsequent heating rate. Then, the temperature is raised to 800°C for 2 hours and kept at 800°C for 2 hours. This process mainly uses high-temperature calcination of organic matter in sawdust to achieve the effect of hole making. Finally, the temperature is raised to 1140°C for 30 minutes and kept at 1140°C for 1 hour. This process is mainly to melt sodium silicate particles to enhance the strength of ceramsite and further calcine the unreacted sawdust. Subsequently, the ceramsite that has been calcined and cooled to room temperature is cured in a constant temperature and humidity curing box with a relative humidity of 20 and a temperature of 70°C for 3-7 days. After the cured ceramsite is cooled to room temperature, it is stored in a sealed bag.

[0100] 3. Adsorption of carbonate repair agent: Soak the cured expanded clay in a sufficient amount of 4 mol / L sodium carbonate solution for 24 hours to fully absorb the sodium carbonate solution.

[0101] 4. Epoxy resin encapsulation: Epoxy resin and BGE (n-butyl glycidyl ether) are mixed evenly at a mass ratio of 1:0.1 to make the epoxy resin have a certain fluidity, and then an epoxy resin curing agent equal to the epoxy resin is added, and the mixture is stirred for 2 minutes until the color of the mixture is milky yellow, thereby preparing the epoxy resin encapsulation layer. Next, the ceramsite adsorbed with sodium carbonate solution is added to the epoxy resin coating, stirred at a constant speed for 1 minute with a glass rod, and then the excess epoxy resin coating is removed with a filter funnel.

[0102] 5. Rolling powder: Add the ceramsite coated with epoxy resin into a mixed powder of cement and calcium hydrogen phosphate dihydrate with a mass ratio of 9:1 and rub repeatedly to avoid adhesion between the ceramsite particles and provide a calcium source at the outer shell of the ceramsite particles. Finally, sieve out the excess powder, select the self-healing particles with a particle size of 8-11mm, store them in a constant temperature and humidity curing box with a relative humidity of 90 and a temperature of 35°C, and cure them for 7 days to obtain the ceramsite repair agent. For details, refer to Figure 4 As shown, the ceramsite repair agent includes a first ceramsite core 1, a first epoxy resin layer 2 and a first cement layer 3. The first epoxy resin layer 2 is wrapped around the first ceramsite core 1, and the first cement layer 3 is wrapped around the first epoxy resin layer 2.

[0103] Example 1

[0104] A ceramsite composite comprises the following raw materials in grams: 300 g of coal gangue powder, 150 g of calcined coal gangue powder, 50 g of ore powder, 100 g of sawdust and 50 g of sodium silicate.

[0105] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 600° C. for 1.5 hours.

[0106] Example 2

[0107] A ceramsite composite comprises the following raw materials in grams: 1200 g of coal gangue powder, 600 g of calcined coal gangue powder, 200 g of ore powder, 400 g of sawdust and 200 g of sodium silicate.

[0108] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 1000° C. for 2.5 hours.

[0109] Example 3

[0110] A ceramsite composite comprises the following raw materials in grams: 700 g of coal gangue powder, 400 g of calcined coal gangue powder, 120 g of ore powder, 220 g of sawdust and 120 g of sodium silicate.

[0111] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 800° C. for 2 hours.

[0112] Example 4

[0113] A ceramsite composite comprises the following raw materials in grams: 400 g of coal gangue powder, 180 g of calcined coal gangue powder, 80 g of ore powder, 100 g of activated carbon and 80 g of zirconium oxide.

[0114] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 600° C. for 1.5 hours.

[0115] Example 5

[0116] A ceramsite composite comprises the following raw materials in grams: 600 g of coal gangue powder, 180 g of calcined coal gangue powder, 120 g of ore powder, 200 g of activated carbon and 100 g of zirconium oxide.

[0117] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 1000° C. for 2.5 hours.

[0118] Example 6

[0119] A ceramsite composite comprises the following raw materials in grams: 800 g of coal gangue powder, 450 g of calcined coal gangue powder, 160 g of ore powder, 280 g of ammonium bicarbonate and 140 g of silicon carbide.

[0120] The calcined coal gangue powder is obtained by calcining the coal gangue powder at 800° C. for 2 hours.

[0121] Example 7

[0122] A method for preparing ceramsite comprises: mixing the coal gangue powder, calcined coal gangue powder, ore powder, sawdust and sodium silicate in the composition of Example 1, and granulating in a granulator to obtain a ceramsite matrix;

[0123] The ceramsite matrix is ​​calcined in a muffle furnace:

[0124] First calcination treatment: heating from room temperature to 130°C and keeping at 130°C for 60 minutes, with a heating time of 20 minutes;

[0125] Second calcination treatment: heating from 130°C to 700°C and keeping at 700°C for 2.5 hours, heating time is 1.5 hours;

[0126] The third calcination treatment: heating from 700°C to 1100°C and keeping at 1100°C for 80 minutes, the heating time is 20 minutes;

[0127] After constant temperature and humidity curing at a relative humidity of 16, 60°C, ceramsite is obtained.

[0128] Example 8

[0129] A method for preparing ceramsite comprises: mixing the coal gangue powder, calcined coal gangue powder, ore powder, sawdust and sodium silicate in the composition of Example 2, and granulating in a granulator to obtain a ceramsite matrix;

[0130] The ceramsite matrix is ​​calcined in a muffle furnace:

[0131] First calcination treatment: heating from room temperature to 160°C and keeping at 160°C for 30 minutes, the heating time is 60 minutes;

[0132] Second calcination treatment: heating from 160°C to 900°C and keeping at 900°C for 1.5 hours, heating time is 2.5 hours;

[0133] The third calcination treatment: heating from 900°C to 1200°C and keeping at 1200°C for 40 minutes; the heating time is 40 minutes;

[0134] After constant temperature and humidity curing at a relative humidity of 24, 80°C, ceramsite is obtained.

[0135] Example 9

[0136] A method for preparing ceramsite comprises: mixing the coal gangue powder, calcined coal gangue powder, ore powder, sawdust and sodium silicate in the composition of Example 3, and granulating in a granulator to obtain a ceramsite matrix;

[0137] The ceramsite matrix is ​​calcined in a muffle furnace:

[0138] First calcination treatment: heating from room temperature to 140°C, keeping temperature for 40 minutes, heating time for 30 minutes;

[0139] Second calcination treatment: heating from 140°C to 780°C and keeping at 780°C for 2 hours. The heating time is 2 hours.

[0140] The third calcination treatment: heating from 780°C to 1150°C and keeping at 1150°C for 55 minutes, the heating time is 35 minutes;

[0141] After constant temperature and humidity curing at a relative humidity of 18, 75°C, ceramsite is obtained.

[0142] Example 10

[0143] A method for preparing a concrete repairing agent, comprising:

[0144] The ceramsite prepared in Example 7 is adsorbed with a sodium carbonate solution having a molar concentration of 2 mol / L to obtain repaired ceramsite; the repaired ceramsite is wrapped with an epoxy resin wrapping agent to obtain wrapped ceramsite; the mass ratio of epoxy resin to n-butyl glycidyl ether in the epoxy resin wrapping agent is 1:0.05;

[0145] The cement repair agent is evenly attached to the outer surface of the coated expanded clay to obtain the expanded clay repair agent; in the cement repair agent, the mass ratio of cement to dibasic calcium phosphate dihydrate is 8.5:1.5.

[0146] Embodiment 11

[0147] A method for preparing a concrete repairing agent, comprising:

[0148] The ceramsite prepared in Example 8 is adsorbed with a sodium carbonate solution having a molar concentration of 3 mol / L to obtain repaired ceramsite; the repaired ceramsite is wrapped with an epoxy resin wrapping agent to obtain wrapped ceramsite; the mass ratio of epoxy resin to n-butyl glycidyl ether in the epoxy resin wrapping agent is 1:0.15;

[0149] The cement repair agent is evenly attached to the outer surface of the coated expanded clay to obtain the expanded clay repair agent; in the cement repair agent, the mass ratio of cement to dibasic calcium phosphate dihydrate is 9.5:0.5.

[0150] Example 12

[0151] A method for preparing a concrete repairing agent, comprising:

[0152] The ceramsite prepared in Example 9 is adsorbed with a sodium carbonate solution having a molar concentration of 4 mol / L to obtain repaired ceramsite; the repaired ceramsite is wrapped with an epoxy resin wrapping agent to obtain wrapped ceramsite; the mass ratio of epoxy resin to n-butyl glycidyl ether in the epoxy resin wrapping agent is 1:0.1;

[0153] The cement repair agent is evenly attached to the outer surface of the coated expanded clay to obtain the expanded clay repair agent; in the cement repair agent, the mass ratio of cement to calcium hydrogen phosphate dihydrate is 9:1.

[0154] Embodiment 13

[0155] A method for preparing ceramsite comprises: weighing 600g of 100-mesh coal gangue powder, 300g of coal gangue powder calcined at 800°C for two hours, 100g of 100-mesh ore powder, 100g of 100-mesh sawdust and 200g of 100-mesh sodium silicate particles, mixing the above powders and granulating them, curing them for 7 days after granulation to obtain green granules.

[0156] The raw pellets were placed in a muffle furnace for calcination. The furnace temperature was raised from room temperature to 150°C in 30 minutes and kept at 150°C for 40 minutes. The temperature was raised to 800°C in 2 hours and kept at 800°C for 2 hours. Finally, the temperature was raised to 1140°C in 30 minutes and kept at 1140°C for 1 hour.

[0157] Subsequently, the calcined ceramsite cooled to room temperature was cured in a constant temperature and humidity curing box at a relative humidity of 20 and a temperature of 70° C. for 7 days. The cured ceramsite was cooled to room temperature and stored in a sealed bag.

[0158] Embodiment 14

[0159] A method for preparing ceramsite comprises: weighing 600g of 100-mesh coal gangue powder, 300g of coal gangue powder calcined at 800°C for two hours, 100g of 100-mesh ore powder, 120g of 100-mesh sawdust and 100g of 100-mesh sodium silicate particles, mixing the above powders and granulating them, curing them for 7 days after granulation to obtain green granules.

[0160] The raw pellets were placed in a muffle furnace for calcination. The furnace temperature was raised from room temperature to 150°C in 30 minutes and kept at 150°C for 40 minutes. The temperature was raised to 800°C in 2 hours and kept at 800°C for 2 hours. Finally, the temperature was raised to 1140°C in 30 minutes and kept at 1140°C for 1 hour.

[0161] Subsequently, the calcined ceramsite cooled to room temperature was cured in a constant temperature and humidity curing box at a relative humidity of 20 and a temperature of 70° C. for 7 days. The cured ceramsite was cooled to room temperature and stored in a sealed bag.

[0162] Embodiment 15

[0163] A method for preparing ceramsite comprises: weighing 600g of 100-mesh coal gangue powder, 300g of coal gangue powder calcined at 800°C for two hours, 100g of 100-mesh ore powder, 60g of 100-mesh sawdust and 100g of 100-mesh sodium silicate particles, mixing the above powders and granulating them, curing them for 7 days after granulation to obtain green granules.

[0164] The raw pellets were placed in a muffle furnace for calcination. The furnace temperature was raised from room temperature to 150°C in 30 minutes and kept at 150°C for 40 minutes. The temperature was raised to 800°C in 2 hours and kept at 800°C for 2 hours. Finally, the temperature was raised to 1140°C in 30 minutes and kept at 1140°C for 1 hour.

[0165] Subsequently, the calcined ceramsite cooled to room temperature was cured in a constant temperature and humidity curing box at a relative humidity of 20 and a temperature of 70° C. for 7 days. The cured ceramsite was cooled to room temperature and stored in a sealed bag.

[0166] Example 16

[0167] A method for preparing ceramsite comprises: weighing 600g of 100-mesh coal gangue powder, 300g of coal gangue powder calcined at 800°C for two hours, 100g of 100-mesh ore powder, 120g of 100-mesh sawdust and 50g of 100-mesh sodium silicate particles, mixing the above powders and granulating them, curing them for 7 days after granulation to obtain green granules.

[0168] The raw pellets were placed in a muffle furnace for calcination. The furnace temperature was raised from room temperature to 150°C in 30 minutes and kept at 150°C for 40 minutes. The temperature was raised to 800°C in 2 hours and kept at 800°C for 2 hours. Finally, the temperature was raised to 1140°C in 30 minutes and kept at 1140°C for 1 hour.

[0169] Subsequently, the calcined ceramsite cooled to room temperature was cured in a constant temperature and humidity curing box at a relative humidity of 20 and a temperature of 70° C. for 7 days. The cured ceramsite was cooled to room temperature and stored in a sealed bag.

[0170] Embodiment 17

[0171] A method for preparing ceramsite comprises: weighing 600g of 100-mesh coal gangue powder, 300g of coal gangue powder calcined at 800°C for two hours, 100g of 100-mesh ore powder, 120g of 100-mesh sawdust and 200g of 100-mesh sodium silicate particles, mixing the above powders and granulating them, curing them for 7 days after granulation to obtain green granules.

[0172] The raw pellets were placed in a muffle furnace for calcination. The furnace temperature was raised from room temperature to 150°C in 30 minutes and kept at 150°C for 40 minutes. The temperature was raised to 800°C in 2 hours and kept at 800°C for 2 hours. Finally, the temperature was raised to 1140°C in 30 minutes and kept at 1140°C for 1 hour.

[0173] Subsequently, the calcined ceramsite cooled to room temperature was cured in a constant temperature and humidity curing box at a relative humidity of 20 and a temperature of 70° C. for 7 days. The cured ceramsite was cooled to room temperature and stored in a sealed bag.

[0174] Test Case

[0175] 1. The saturated water absorption and compressive strength of the ceramsite of Examples 13-17 were tested.

[0176] 1.1 Test Method

[0177] 1.1.1 Test method for saturated water absorption of ceramsite

[0178] Put the cured ceramsite into a container, peel it and weigh it, the mass is recorded as m1, and pour enough deionized water into the container to cover the ceramsite. From the time the ceramsite comes into contact with deionized water, take out the ceramsite after soaking for 24 hours, and use a dry towel to remove excess water on the surface of the gangue ceramsite. Then use a precision electronic balance to accurately weigh the ceramsite, and record the mass as m2. Based on m1 and m2, calculate the saturated water absorption rate ω of the ceramsite in the natural environment. The saturated water absorption rate is equal to the increase in the mass of the ceramsite after saturation with water divided by the initial value of the ceramsite.

[0179] 1.1.2 Test method for compressive strength of ceramsite

[0180] Using a 5-ton tension and compression testing machine (MTS) model ETM305D, 12 cured ceramsite particles were taken out for strength testing and the average value was taken. The compressive strength calculation formula is as follows:

[0181]

[0182] Among them, δ is the compressive strength of ceramsite (MPa), p is the peak stress (N), and d is the aggregate diameter (mm).

[0183] 1.3 Test Results

[0184] The saturated water absorption rate and compressive strength test results of the ceramsite of Examples 13-17 are shown in Table 1 below.

[0185] Table 1

[0186]

[0187]

[0188] As shown in Table 1, the water absorption rate of the ceramsite of Examples 13-17 is between 24-49%, and the ceramsite prepared in Example 13 has a water absorption rate of up to 49%. As shown in Table 1, the pores of sawdust are insufficient at 60 grams, resulting in low water absorption rate of the ceramsite. The compressive strength of the ceramsite of Examples 13-17 is between 0.8-2.8MPa; by comparing Examples 16 and 17, it can be seen that the compressive strength of 200 grams of sodium silicate is higher than that of 50 grams of sodium silicate; by comparing Examples 14 and 15, it can be seen that when the amount of sodium silicate is the same, the increase in the amount of sawdust will slightly lead to a decrease in compressive strength, but the absorption rate will be significantly enhanced.

[0189] In summary, the ceramsite of the embodiment of the present application has a high water absorption rate. As a carrier of the repair agent, the ceramsite can absorb enough repair agent, thereby facilitating the self-repair of building cracks. The compressive strength of the ceramsite is moderate and is less than the compressive strength of building materials such as concrete, so that when cracks appear in the building material, the ceramsite breaks and the repair agent therein flows to the crack to play a self-repairing role.

[0190] In addition, the ceramsite repair agent made of the above ceramsite has the above ceramsite as the core, epoxy resin as the middle layer to wrap the core, and cement repair agent to wrap the middle layer. When repairing building materials, the cement repair agent of the ceramsite repair agent can have a good reaction interface with the concrete material, so that the interface bonding force between the ceramsite repair agent and the concrete material is stronger. The use of epoxy resin as the middle layer can effectively avoid the loss of the repair agent in the ceramsite, so that the ceramsite repair agent has better stability.

[0191] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A ceramsite composition, characterized in that: The invention comprises the following raw materials in parts by weight: 300-1200 parts of coal gangue, 150-600 parts of calcined coal gangue, 50-200 parts of ore, 100-400 parts of pore former and 50-200 parts of binder.

2. The ceramsite composition according to claim 1, wherein The calcined coal gangue is obtained by calcining coal gangue at 600-1000° C. for 1.5-2.5 hours.

3. The ceramsite composition as claimed in claim 1 or 2, characterized in that: The ore includes one or more of metal ore, stone ore and industrial silicon slag; and / or the pore-forming agent is one or more of sawdust, straw shreds, calcium carbonate, magnesium carbonate, activated carbon, starch, polyvinyl alcohol, ammonium bicarbonate, calcium carbonate, magnesium oxide, zinc oxide, potassium hydroxide and zinc chloride, and / or the binder is one or more of silicate, calcined alumina, zirconium oxide and silicon carbide.

4. A method for preparing ceramsite, characterized in that: include: The powdered coal gangue, calcined coal gangue, ore, pore former and binder in the composition according to any one of claims 1 to 3 are mixed and granulated to obtain a ceramsite matrix; The ceramsite matrix is ​​calcined to obtain the ceramsite.

5. The preparation method according to claim 4, characterized in that: The ceramsite matrix is ​​calcined to obtain the ceramsite; comprising: The ceramsite matrix is ​​subjected to a first calcination treatment to remove moisture from the ceramsite matrix to obtain a first ceramsite matrix; The first ceramsite matrix is ​​subjected to a second calcination treatment to form pores in the first ceramsite matrix to obtain a second ceramsite matrix; The second ceramsite matrix is ​​subjected to a third calcination treatment to remove residual pore formers.

6. The preparation method according to claim 5, characterized in that: The first calcination treatment comprises: heating from room temperature to 130-160°C, and keeping the temperature at 130-160°C for 30-60 minutes, wherein the heating time is more than 20 minutes; The second calcination treatment comprises: after the first calcination treatment, heating from 130-160° C. to 700-900° C. and keeping the temperature at 700-900° C. for 1.5-2.5 hours, wherein the heating time is 1.5-2.5 hours; The third calcination treatment comprises: heating from 700-900° C. to 1100-1200° C. after the second calcination treatment, and keeping the temperature at 1100-1200° C. for 40-80 minutes, and the heating time is 20-40 minutes.

7. The preparation method according to claim 5 or 6, characterized in that: Also includes: The second ceramsite matrix is ​​subjected to the third calcination treatment and then maintained at a constant temperature and humidity of 60-80° C. at a relative humidity of 16-24° C. to obtain the ceramsite.

8. A method for preparing a ceramsite repairing agent, characterized in that: include: The ceramsite obtained by the preparation method according to any one of claims 4 to 7 is adsorbed with the repair agent to obtain the repaired ceramsite; The repaired ceramsite is wrapped with a wrapping agent to obtain wrapped ceramsite; The coated ceramsite is coated with an interface repair agent to obtain a ceramsite repair agent.

9. The method for preparing the ceramsite repairing agent according to claim 8, characterized in that: The repaired ceramsite is packaged with a packaging agent to obtain packaged ceramsite; comprising: The repaired ceramsite is wrapped with an epoxy resin wrapping agent, and after curing, the wrapped ceramsite is obtained; wherein the epoxy resin wrapping agent is prepared by mixing epoxy resin, butyl glycidyl ether and a curing agent, and the mass ratio of the epoxy resin to the butyl glycidyl ether is 1:(0.05-0.15); the mass ratio of the epoxy resin to the curing agent is 1:(0.7-1.2); and / or, The coated ceramsite is treated by coating with an interface repair agent to obtain a ceramsite repair agent; comprising: The cement repair agent is evenly attached to the outer surface of the coated ceramsite to obtain the ceramsite repair agent; wherein the cement repair agent is prepared by mixing cement and dibasic calcium phosphate dihydrate, and the mass ratio of the cement to the dibasic calcium phosphate dihydrate is (8.5-9.5):(0.5-1.5); And / or, the repair agent is a carbonate solution.

10. Use of the ceramsite composition according to claims 1-3, the ceramsite prepared by the preparation method according to any one of claims 4-7, or the ceramsite repairing agent prepared by the preparation method according to any one of claims 8-9 for repairing cracks in buildings.

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