Self-repairing aggregate and preparation method and application thereof

Self-repairing aggregate and its preparation method and application technical field

[0001] The present invention belongs to the technical field of functional materials, and specifically relates to a self-repairing aggregate and a preparation method and application thereof.

Background technique

[0002] It is well known that concrete is a brittle material with low tensile strength. During the construction and service of concrete structures, the concrete will have cracks of different sizes due to changes in temperature and humidity, external loads and other factors. Concrete self-repair technology refers to the built-in repair agent when the concrete is formed, and when the structure cracks when the structure is in service, the crack triggers the repair agent to react with the external environment, and the resulting repair product seals the crack. Concrete self-repair technology is a new solution to the problem of concrete cracks, which is of great significance for improving the durability of concrete materials and increasing the service life of concrete structures.

[0003] In the existing self-healing aggregates, the repairing agent mostly adopts a high molecular polymer adhesive, with expanded perlite, glass fiber or ceramsite as a carrier. Although high molecular polymers have good cohesiveness, the bonding effect of organic binders applied to the bonding between concrete and inorganic materials is poor, and the strength of the bonded concrete is low. At the same time, the mechanical strength of perlite, glass fiber and ceramsite is relatively low and cannot completely replace the coarse aggregate of the same particle size in concrete.

Summary of the invention

[0004] In order to solve the above problems, the present invention provides a self-healing aggregate with good mechanical strength and excellent bonding performance with the concrete matrix interface, and a preparation method and application thereof.

[0005] The present invention provides a self-healing aggregate, including a carrier and a repair agent dispersed in the carrier; the carrier includes a porous material and a coating shell encapsulating the porous material; the porous material includes sintering Ceramic microbeads, there are gaps between adjacent sintered ceramic microbeads; the repairing agent is a two-component system of two components, including silicate and carbonate; the coating shell is a silica gel after hardening The silica; The self-healing aggregate has a particle size of 5-10mm.

[0006] Preferably, the mass ratio of the silicate and carbonate is 2~4:1.

[0007] Preferably, the silicate includes sodium silicate and/or potassium silicate; the carbonate includes sodium carbonate and/or potassium carbonate.

[0008] Preferably, the particle size of the porous material is 5-10 mm, and the porosity of the porous material is below 40%.

[0009] Preferably, the preparation method of the porous material includes the following steps:

[0010] After sintering the ceramic glass beads, they are crushed and sieved to obtain a porous material;

[0011] The sintering temperature is 1000~1500°C; the sintering time is 60~80h.

[0012] Preferably, the particle size of the ceramic glass beads is W1mm.

[0013] Preferably, the thickness of the covering shell is 0.3 to 0.5 mm.

[0014] The present invention provides a preparation method of the self-healing aggregate described in the above technical solution, including the following steps:

[0015] The repair agent is adsorbed in the porous material to obtain a porous material supporting the repair agent;

[0016] The surface of the porous material supporting the repairing agent is coated with a semi-solid silicic acid gel, and then hardened to form a coating shell to obtain a self-healing aggregate.

[0017] Preferably, the adsorption method is a vacuum impregnation method; the adsorption time is 15-20 min; and the vacuum degree of the vacuum impregnation method is 0.06 MPa.

[0018] The present invention provides the application of the self-repairing aggregate described in the above technical solution or the self-repairing aggregate prepared by the method described in the above technical solution in concrete.

[0019] The present invention provides a self-healing aggregate, including a carrier and a repair agent dispersed in the carrier; the carrier includes a porous material and a coating shell encapsulating the porous material; the porous material includes sintering Ceramic microbeads, there are gaps between adjacent sintered ceramic microbeads; the repairing agent is a two-component system of two components, including silicate and carbonate; the coating shell is a silica gel after hardening The silica; the self-healing aggregate has a particle size of 5-10mm. The present invention uses a solution of silicate and carbonate binary components as the repairing agent. The silicate solution has good adhesion but poor fluidity. It is not conducive to using the silicate solution alone as the repairing agent. The release of the repairing agent; although the carbonate solution alone improves the fluidity of the repairing agent, it lacks adhesion to cracks. The present invention uses the solution of silicate and carbonate binary components as the repairing agent to improve the fluidity of the repairing agent, and at the same time make the repairing agent have better adhesion to the cracks, and improve the repairing agent and concrete inorganic materials. The bonding effect between them, thereby enhancing the strength of the concrete after bonding. The invention uses the porous material sintered by ceramic glass beads as a carrier, has a large number of pore structures, and can absorb a large amount of repairing agent for repairing cracks, and the pore structure formed by sintering the ceramic glass beads has higher mechanical strength. In the present invention, the silicon dioxide formed after the silicic acid gel is hardened is used as the protective and repairing agent for the coating shell, which prevents the loss of the repairing agent and further improves the self Repair the mechanical strength of the aggregate, and the present invention uses silicic acid gel (high modulus) for encapsulation. After encapsulation, it continues to react and harden into silicon dioxide, while the repair agent uses silicate (low modulus) and carbonate. The dual system of the, using the characteristics of high and low modulus stability difference, so that the repair agent and the package shell have better compatibility and stability. The self-healing aggregate provided by the present invention is mixed into concrete, can replace the coarse aggregate in the concrete, forms a concrete self-repairing system, has a better repairing effect on self-repairing concrete cracks, and the self-repairing aggregate provided by the present invention is compatible with The concrete interface has excellent bonding properties and matches the mechanical strength of concrete materials, which can improve the mechanical strength of concrete.

Description of the drawings

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are merely present For some embodiments of the invention, for those of ordinary skill in the art, other drawings may be obtained based on these drawings without creative labor.

[0021] Figure 1 is a schematic diagram of the self-healing aggregate structure, in which 1 is sintered ceramic microbeads, 2 is a repair agent, and 3 is a coated shell; [0022] Figure 2 is a self-healing aggregate physical diagram;

[0023] FIG. 3 is a diagram showing the release of the repairing agent after the self-healing aggregate is broken;

[0024] Figure 4 is a self-healing aggregate self-healing concrete crack diagram;

[0025] FIG. 5 is a self-repair effect diagram after 15 days of age.

Detailed ways

[0026] The present invention provides a self-healing aggregate, including a carrier and a repair agent dispersed in the carrier;

[0027] The carrier includes a porous material and a covering shell encapsulating the porous material;

[0028] The porous material includes sintered ceramic beads, and there are gaps between adjacent sintered ceramic beads;

[0029] The repair agent is a two-component binary system, including silicate and carbonate;

[0030] The covering shell is silicon dioxide after hardening of silicic acid gel;

[0031] The particle size of the self-healing aggregate is 5-10mm (a schematic structural diagram is shown in Figure 1, and a physical diagram is shown in Figure 2).

[0032] The repair agent of the present invention includes silicate and carbonate. In the present invention, the mass ratio of the silicate to the carbonate is preferably 2~4:1, more preferably 3:1. The silicate preferably includes sodium silicate and/or potassium silicate, and the carbonate preferably includes sodium carbonate and/or potassium carbonate.

[0033] In the present invention, the repairing agent is a binary material of silicate and carbonate, wherein silicate can stimulate the hydration of concrete and rehydrate the fracture surface to generate CSH gel ; Carbonate can react with calcium hydroxide in the concrete to produce calcium carbonate precipitation and potassium hydroxide, which can improve the pH environment of the crack section and better improve the durability of the concrete; at the same time, the combined use of two repair agents can improve the repair agent At the same time, it can make the repairing agent have better adhesion to the cracks, and improve the bonding effect between the repairing agent and the concrete inorganic material, thereby further enhancing the strength of the cemented concrete.

[0034] In the present invention, the carrier includes a porous material and a coating shell encapsulated in the porous material; the porous material includes sintered ceramic beads, and the sintered ceramic beads are adjacent to the sintered ceramic beads. There are voids between; the particle size of the sintered ceramic beads is preferably 0.5 to 1 mm; the porosity of the porous material is preferably 40% or less, more preferably 20% to 40%, more preferably 30% to 40%. In the present invention, the preparation method of the porous material preferably includes the following steps: after sintering the ceramic glass beads, crushing and sieving to obtain the porous material; the sintering temperature is preferably 1000~1500°C, more preferably 1100~1300°C; the sintering time is preferably 60~80h, more preferably 63~75h, more preferably 70~72h; the particle size of the ceramic glass beads is preferably W1mm, more preferably W0.8mm; In the present invention, the sieving preferably uses a 10mm sieve for sieving and taking the under-the-screen material, and a 5mm sieve for sieving and taking the over-the-screen material; the present invention has no special requirements for the crushing method, and adopts technology in the field. The method familiar to the personnel is sufficient.

[0035] In the present invention, the adsorption rate of the carrier adsorption repair agent is preferably 60~80%, more preferably 65~72%, more preferably 68~70%.

[0036] The coating shell of the present invention preferably includes silica after hardening silicic acid gel, and the thickness of the coating shell is preferably 0.3 to 0.5 mm, more preferably 0.35 to 0.42 mm.

[0037] The present invention also provides a method for preparing the self-healing aggregate described in the above technical solution, which includes the following steps: [0038] The repair agent is adsorbed in the porous material to obtain a porous material supporting the repair agent;

[0039] The surface of the porous material supporting the repairing agent is coated with a semi-solid silicic acid gel, and then hardened to form a coating shell to obtain a self-repairing aggregate.

[0040] In the present invention, the repairing agent is adsorbed on the porous material to obtain the porous material supporting the repairing agent. In the present invention, the adsorption preferably adopts a vacuum impregnation method; the adsorption time is preferably 15-20 min, more preferably 16-18 min; the vacuum degree of the vacuum impregnation method is preferably 0.06 MPa, more preferably 0.045 MPa . Specifically, in the present invention, it is preferable to place the porous material in a repair agent solution for vacuum immersion adsorption.

[0041] In the repair agent solution of the present invention, the solvent used to dissolve silicate is preferably deionized water; the mass content of silica in the silicate solution is preferably 20 to 30%, more preferably 23 ~28%; In the present invention, the solvent used to dissolve the carbonate is preferably deionized water; the concentration of the carbonate is preferably 0.8~1.5mol/L, more preferably 0.9~1.1mol/L, more Preferably it is 1.0mol/L; the mass ratio of the silicate to the carbonate is preferably 2~4:1, more preferably 2.8~3.3:1, more preferably 3:1; the silicate preferably includes Sodium silicate and/or potassium silicate, the carbonate preferably includes sodium carbonate and/or potassium carbonate; the stirring rate is preferably 3000~3500 revolutions/minute, more preferably 3100~3300 revolutions/minute; The stirring time is preferably 3~10min, more preferably 4~8min, more preferably 5

~6min. The invention has no special requirements for the stirring mode, and a magnetic stirrer is preferably used.

[0042] In the present invention, the second solution for preparing the repairing agent solution preferably includes: first dissolving carbonate in a solvent to prepare a carbonate solution, and then adding silicate to the carbonate solution, and stirring uniformly to obtain Repair agent. The concentration of the carbonate solution is preferably 0.8 to 1.5 mol/L, more preferably 0.9 to 1.1 mol/L, more preferably 1.0 mol/L; the mass ratio of silicate to carbonate is preferably 2~4:1, more preferably 2.8~3.3:1, more preferably 3:1; the solvent is preferably deionized water.

[0043] In the present invention, the third solution for preparing the repairing agent preferably includes: first dissolving silicate in a solvent to prepare a silicate solution, and then adding carbonate to the silicate solution, and stirring uniformly to obtain the repair Agent. The mass content of silica in the silicate solution is preferably 20 to 30%, more preferably 23 to 28%; the mass ratio of silicate to carbonate is preferably 2 to 4: 1, more preferably It is 2.8~3.3:1, more preferably 3:1; the solvent is preferably deionized water.

[0044] In the present invention, the preparation method of the porous material preferably includes: sintering the ceramic glass beads and then crushing and sieving to obtain a porous material with higher porosity.

[0045] In the present invention, the particle size of the ceramic glass beads is preferably W1mm, more preferably W0.8mm; the sintering temperature is preferably 1000~1500°C, more preferably 1100~1300°C; The sintering time is preferably 60 to 80 hours, more preferably 63 to 75 hours, and more preferably 70 to 72 hours.

[0046] In the present invention, the sieving preferably uses a 10mm sieve for sieving and taking the under-the-sifted material, and a 5mm sieve for sieving and taking the over-the-sifted material; the present invention has no special requirements for the crushing method, adopting The method well known to those skilled in the art is sufficient.

[0047] In the present invention, after the sieving, the present invention preferably sequentially wash, filter, and dry the obtained sieved product to obtain the porous material. The washing is preferably deionized water, the drying temperature is preferably 80~120C, more preferably 95~110C, more preferably 100~105C; The drying time is preferably 11~15h, into a further preferably 12 ~13h. The present invention has no special requirements on the filtering method and the drying method, and the method well known in the art can be used.

[0048] After obtaining the repairing agent-loaded porous material, the present invention coats the surface of the repairing agent-loaded porous material with a semi-solid silicic acid gel, and then hardens to form a coating shell to obtain a self-healing aggregate.

[0049] The present invention has no special requirements on the coating method, and a method well known in the art can be used. In the present invention, a coating machine or manual brushing is preferably used. In the present invention, the thickness of the covering shell is preferably 0.3 to 0.5 mm, more preferably 0.35 to 0.42 mm.

[0050] In the present invention, the preparation method of the semi-solid silicic acid gel includes the following method 1 or method 2.

[0051] The method 1 preferably includes the following steps: placing the water glass in a sealed container, and introducing carbon dioxide into the sealed container containing the water glass to obtain a semi-solid silicic acid gel. The sealed container is connected with a carbon dioxide gas cylinder through a hose. The mass content of silica in the water glass is preferably 25 to 35%, and more preferably 27 to 29%; the time for introducing carbon dioxide is preferably 15 to 35 minutes, more preferably 20 to 30 minutes; The flow rate of carbon dioxide is preferably 300 mL/min.

[0052] The method 2 includes the following steps:

[0053] Dissolving silicate in water to obtain a silicate solution;

[0054] The silicate solution is mixed with the curing agent, and stirred uniformly to obtain a semi-solid silicic acid gel.

[0055] In the present invention, the mass ratio of the silicate to the curing agent is preferably 100:10-20, more preferably 100:12-18, more preferably 100:15-17; the silicate Preferably, it is sodium silicate and/or potassium silicate; the mass concentration of the silicate solution is preferably 25~35%, more preferably 28~32%; the curing agent is preferably an inorganic acid, fluorosilicic acid

One or more of salt and polymeric phosphate, more preferably sodium fluorosilicate.

[0056] The present invention preferably hardens the carrier coated with a semi-solid silicic acid gel on the surface, and then naturally cools to room temperature to obtain a self-healing aggregate.

[0057] In the present invention, the hardening is performed in a carbon dioxide atmosphere, and the hardening temperature is preferably 20-40° C., more preferably 25-36° C, more preferably 28-32° C; the relative humidity of the hardening It is preferably not more than 30%; the hardening time is preferably 10-20 min, more preferably 13-18 min. The invention hardens the carrier coated with silicic acid gel on the surface to dry the shell of the aggregate.

[0058] The present invention uses silicic acid gel (high modulus water glass) for encapsulation. After encapsulation, it continues to react and harden into silica, and the repair agent uses a binary combination of silicate (low modulus) and carbonate. The system uses the characteristics of high and low modulus stability differentiation, so that the repair agent and the package shell have better compatibility and stability.

[0059] The present invention also provides the application of the self-repairing aggregate described in the above-mentioned scheme or the self-repairing aggregate obtained by the preparation method described in the above-mentioned technical scheme in concrete. The self-repairing aggregate in the present invention can completely replace the gravel with the same particle size as the self-repairing aggregate in concrete. The self-repairing aggregate provided by the invention has a physical trigger function sensitive to the outside, and forms a self-repairing system capable of repairing cracks in the concrete. After mixing the self-healing aggregate into concrete, the self-healing aggregate can be evenly distributed in the concrete. The self-healing aggregate will not be broken during the mixing and curing process. In the process of concrete use, once there is a crack, stress will be generated. The self-healing aggregate is triggered to rupture and the repairing agent is released. Under air conditions, the repairing agent immediately reacts with the surface of the concrete crack to form precipitates to achieve the purpose of repairing. If the concrete does not produce cracks, the repaired aggregate after replacement can stably exist in the concrete matrix for a long time.

[0060] In order to further illustrate the present invention, the self-healing aggregate provided by the present invention and its preparation method and application are described in detail below in conjunction with the accompanying drawings and examples, but they cannot be understood as limiting the scope of protection of the present invention.

Example 1

[0062] 5000g of ceramic glass beads with a particle size of not greater than 1mm were sintered at 1200C for 72 hours and then crushed and sieved to obtain sintered ceramic beads; the sieving was performed with a 10mm sieve for sieving and removing the sieve, Use a 5mm sieve for sieving and take the sieve. The sieved products are washed and filtered in order with deionized water, and then placed in a drying box, and dried at 100C for 12 hours to remove free water in the porous material.

[0063] Dissolve 100 parts by mass of sodium silicate in water to obtain a sodium silicate solution with a mass concentration of 25%; add 15 parts by mass of sodium fluorosilicate to the sodium silicate solution, and stir uniformly to obtain a semi-solidified state Of silicic acid gel.

[0064] Dissolve sodium silicate in water to obtain a sodium silicate solution with a mass concentration of 25%, and dissolve potassium carbonate in water to obtain a potassium carbonate solution with a concentration of 1 mol/L, wherein the mass ratio of sodium silicate to potassium carbonate is 3:1; After mixing the sodium silicate solution and potassium carbonate solution, stir at 3200 rpm for 5 minutes to obtain the repair agent.

[0065] 1000 g of the repair agent was added with 1000 g of porous material, and vacuum impregnation was performed in an environment with a vacuum of 0.06 MPa, so that the repair agent was adsorbed in the voids of the porous material to obtain a loaded repair agent, and the adsorption time was 15 min. After filtering, the loaded repairing agent and 500 g of silicic acid gel are mixed and placed in a coating machine for coating to obtain a coating shell with a thickness of 0.3-0.5 mm. The loaded repair agent with the coated shell is placed in an environment with a temperature of 30C and a relative humidity of less than 30% for curing treatment. After 15 minutes of curing, the temperature is naturally cooled to room temperature to obtain a self-healing aggregate.

[0066] The physical map of the self-healing aggregate prepared in Example 1 of the present invention is shown in FIG. 2.

[0067] After crushing the self-healing aggregate, observe its broken state, as shown in FIG. 3. As can be seen from FIG. 3, after the self-healing aggregate is broken, the repairing agent seeps out from the fracture surface.

[0068] The self-healing aggregate obtained in Example 1 of the present invention was prepared into a concrete sample, and the concrete sample was tested for cracks.

Self-healing performance after sewing.

[0069] The preparation method of the concrete sample is: self-healing concrete is prepared according to the formula in Table 1, and the formula in Table 1 is calculated according to JGJ 55-201K Common Concrete Mixture Design Regulations.

[0070] Table 1 The proportion of self-healing concrete

<td>Water glue ratio (%)</td><td>Cement (g)</td><td>Sand (g)</td><td>Self-repairing aggregate (g)</td><td>Water (g)</td><td>Sand rate (%)</td>

<td>0.44</td><td>440</td><td>753</td><td>1113</td><td>180</td><td>40</td>

[0072] According to the formula in Table 1, weigh 440g cement, 753g sand, 1113g self-healing aggregate, and 180g water; mix cement, sand, self-healing aggregate and water to obtain concrete mortar; pour the concrete mortar into the mold After vibrating, the workpiece is gradually poured to obtain self-healing concrete; the workpiece is cured for 24 hours in an environment with a temperature of 20 °C and a humidity of 100%, then demolded, transferred to a standard curing box, and cured under the same conditions for 28 days to obtain self-healing concrete Sample.

[0073] The self-healing concrete sample was pre-loaded under the flexural testing machine, and the sample was unloaded when cracks appeared. The results showed that: after the concrete sample with self-healing aggregate cracked, the internal aggregate of the concrete cracked and repaired. The agent flows out. As shown in Figure 4, it can be seen from Figure 4 that after self-repairing the cracks of the concrete sample, there is liquid flowing out, and the dark part is the flowing out repair agent.

[0074] After 15 days of age, the repairing agent flowing out of the crack reacts with the surface of the concrete crack to produce a precipitated white product to fill the crack. As shown in Figure 5, it can be seen from Figure 5 that the cracks of the self-healing concrete sample are white Material filling.

[0075] Comparative Example 1

[0076] Configure ordinary concrete, and compare the flexural strength and compressive strength of ordinary concrete with the self-healing concrete in Example 1 of the present invention. The formula of ordinary concrete is shown in Table 2. The formula of Table 2 is calculated according to JGJ 55-201K Ordinary Concrete Mixture Design Regulations.

[0077] Table 2 Proportion of ordinary concrete

<td>Water glue ratio (%)</td><td>Cement (g)</td><td>Sand (g)</td><td>Crushed stone (g)</td><td>Water (g)</td><td>Sand rate (%)</td>

<td>0.44</td><td>440</td><td>753</td><td>1083</td><td>180</td><td>40</td>

[0079] According to the formula in Table 2, weigh 440g cement, 753g sand, 1083g crushed stone, and 180g water; mix cement, sand, crushed stone and water evenly to obtain concrete mortar; pour the concrete mortar into the mold and vibrate, Gradually pour the workpiece to obtain ordinary concrete; the workpiece is cured for 24 hours in an environment with a temperature of 20 °C and a humidity of 100%, then demoulded, transferred to a standard curing box for curing, and cured under the same conditions for 28 days to obtain an ordinary concrete sample.

[0080] The flexural strength and compressive strength of the concrete samples obtained in Example 1 and Comparative Example 1 were tested, and the flexural strength of the self-healing concrete was tested for 3 days, 7 days, 14 days, and 28 days using a flexural testing machine. Strength: Use MTS press to test the compressive strength of self-healing concrete for 3 days, 7 days, 14 days, and 28 days; the test results are shown in Table 3:

[0081] Table 3 Comparison table of flexural strength and compressive strength of self-healing concrete and ordinary concrete

<td></td><td>Age</td><td>3 days</td><td>7 days</td><td>14 days</td><td>28 days</td>

<td rowspan="2">Self-healing concrete</td><td>Flexural strength (MPa)</td><td>2.3</td><td>4.9</td><td>6.3</td><td>7.1</td>

<td>Compressive strength (MPa)</td><td>18.9</td><td>34.6</td><td>41.2</td><td>46.1</td>

<td rowspan="2">Ordinary concrete</td><td>Flexural strength (MPa)</td><td>1.8</td><td>4</td><td>5.6</td><td>6.4</td>

<td>Compressive strength (MPa)</td><td>17.8</td><td>31.3</td><td>36.7</td><td>40</td>

[0084] It can be seen from Table 3 that the self-healing aggregate provided by the present invention or the self-healing aggregate obtained according to the preparation method provided by the present invention

The repaired aggregate has excellent mechanical strength, which can match the mechanical strength of concrete materials. It can completely replace the gravel of the same particle size in the concrete to form self-repairing concrete. Compared with ordinary concrete, its flexural strength and compressive strength are increased by 11.67%. An increase of 15.25%.

Embodiment 2

[0086] Adhesiveness experiments were carried out using potassium silicate solution, potassium carbonate solution, two-component potassium silicate and potassium carbonate solution respectively, and the test methods of the adhesion test were:

[0087] (1) A total of 12 sets of pure slurry test blocks were made with 42.5R cement and a water-to-binder ratio of 0.28, with a size of 4 X 4 X 16 mm, and cured in a constant temperature and humidity box at 20°C and RH100% for 28 days. The block is ground in a nitrogen operation box;

[0088] (2) A two-component binary repair agent of one-component potassium silicate solution, potassium carbonate solution, potassium silicate solution and potassium carbonate solution are respectively configured;

[0089] Note: The mass concentration of potassium silicate solution is 26%, the concentration of potassium carbonate solution is 1mol/L, each sample is subjected to three parallel experiments, and the average value is taken;

[0090] (3) After fracturing the clean slurry test block obtained in step (1), apply an equal amount of the one-component repair agent or two-component repair agent of step (2) to the cracks respectively. The flexural strength of the bonded test block after 28 days was tested by a flexural testing machine. The test results are shown in Table 4:

[0091]

[0092] Table 4 The flexural strength of the sample

<td></td><td>Potassium silicate solution</td><td>Potassium carbonate solution</td><td>Two-component</td>

<td>Flexural strength/MPa</td><td>2.8</td><td>0</td><td>4.1</td>

[0093] The present invention uses a solution of silicate and carbonate binary components as the repairing agent to improve the fluidity of the repairing agent, and at the same time make the repairing agent have better adhesion to the cracks, and improve the repairing agent and The bonding effect between the concrete inorganic materials, thereby enhancing the strength of the bonded concrete. It can be seen from the test results in Table 4 that the effect of the dual-component repair agent in the present invention is better than that of the single-component repair agent.

[0094] Although the above-mentioned embodiments give a detailed description of the present invention, they are only a part of the embodiments of the present invention, rather than all the embodiments. People can also obtain other embodiments according to this embodiment without being creative. These embodiments all belong to the protection scope of the present invention.