A method for plugging through cracks of large volume macroporous concrete and a plugging material thereof

Abstract

The application discloses a leaking stopping method for large-volume and large-pore concrete through cracks and a leaking stopping material thereof, and belongs to the field of building leakage treatment. The leaking stopping method provided by the application is characterized in that a straight deep hole and an inclined shallow hole are arranged at a crack, acrylic grouting material and fast-hardening inorganic grouting material are sequentially poured into the straight deep hole, and epoxy resin grouting material is poured into the inclined shallow hole. The leaking stopping method solves the problem of insufficient grout coverage of concrete structure defects, realizes all-round filling from inside to outside, and guarantees the integrity of the structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building leakage treatment, in particular to a leakage plugging method for large-volume and large-pore concrete through cracks and a leakage plugging material thereof. BACKGROUND

[0002] The background technology of concrete leakage plugging mainly involves the leakage problem of concrete structure in buildings and its solutions. Concrete structure is prone to water penetration due to the existence of micro cracks or pores, especially when water freezes or expands due to temperature changes, the cracks will further expand, which seriously affects the service life and structural bearing capacity of the building. Therefore, concrete anti-leakage plugging technology is particularly important.

[0003] Traditional leakage plugging methods include direct plugging method, down-line plugging method, wooden wedge plugging method, etc. These methods are mostly suitable for local treatment of holes and cracks. Among them, the drilling method is a commonly used technical means. The drilling method is suitable for group leakage and point leakage problems caused by non-dense concrete. However, for irregular cracks and deep leakage, the traditional method is not effective. Therefore, grouting plugging technology emerges as the times require. Grouting plugging is to inject specific chemical materials into cracks or holes, use high fluidity materials to fill the gaps inside the structure, and form a sealed barrier after solidification to prevent water penetration. This method is not only suitable for concrete structures, but also widely used in engineering fields such as basements, tunnels, dams, etc.

[0004] There are various types of grouting materials, including cement grout, epoxy resin, polyurethane, methyl methacrylate, etc. Although acrylic grouting material has excellent waterproof and rapid curing performance, its weather resistance is poor and it is easily affected by oxidation, hydrolysis and light, leading to aging. In addition, its curing speed is relatively fast, the construction time is limited, and the construction environment and preparation work are required to be higher, if not handled properly, it may affect the waterproof effect and engineering quality. Inorganic fast-hardening grouting material has the advantages of high strength, fast curing speed, can quickly form a stable structural support, and the material cost is relatively low, good environmental protection, etc. However, its shortcomings are that it requires high construction conditions, needs to strictly control the proportioning and mixing time, and the toughness of the cured material is poor, easy to crack. The advantages of epoxy resin grouting material include high strength, no shrinkage to ensure high accuracy, corrosion resistance, anti-creeper to adapt to harsh working conditions. However, its shortcomings are that the extension rate is low after curing, the brittleness is large, the viscosity is high, the fluidity is poor, and the aging resistance is poor, which is easy to produce phenomena such as embrittlement and degradation under the influence of light, heat and water, etc. SUMMARY

[0005] In view of the above prior art deficiencies, the purpose of the present application is to provide a leaking stoppage method and material for large-volume and large-pore concrete through cracks. Compared with traditional leaking stoppage materials and processes, the leaking stoppage method of the present application solves the problem of insufficient coverage of concrete structure defect paste, realizes all-round filling from inside to outside, ensures the integrity of the structure, and is achieved through the following technical solutions:

[0006] In the first aspect of the present application, a leaking stoppage method for large-volume and large-pore concrete through cracks is provided, in which a straight deep hole and an inclined shallow hole are arranged at the crack, acrylic salt grouting material and fast-hardening inorganic grouting material are sequentially poured into the straight deep hole, and epoxy resin grouting material is poured into the inclined shallow hole.

[0007] The present application solves the problem of insufficient coverage of concrete structure defect paste by arranging a straight deep hole and an inclined shallow hole at the crack, sequentially pouring acrylic salt grouting material and fast-hardening inorganic grouting material into the straight deep hole, and pouring epoxy resin grouting material into the inclined shallow hole for leaking stoppage, and the leaking stoppage effect is significantly better than that of traditional leaking stoppage materials and processes. The inventors have also tested the performance of the leaking stoppage method of the present application, and the performance indicators of the leaking stoppage method of the present application all exceed or far exceed the industry standard indicator requirements.

[0008] Further, the straight deep hole is a hole drilled to 2 / 3~1 of the thickness of the concrete structure at the crack, and the inclined shallow hole is a hole drilled to 1 / 3~1 / 2 of the thickness of the concrete structure at 30~45° on both sides of the crack.

[0009] Further, the diameter of the straight deep hole is 20~28mm, the straight deep holes are spaced 25~35cm apart from each other, and the diameter of the inclined shallow hole is 10~14mm.

[0010] Further, the raw materials of the acrylic salt grouting material include A component and B component in a mass ratio of (0.9~1.1):(0.35~0.45), wherein the A component includes the following raw materials in the following weight percentages: light burned magnesia 10~15%, acrylic acid 25~30%, magnesium aluminum silicate 1~5%, water 50~60%, and polymerization inhibitor 0.1~0.4%, and the B component includes the following raw materials in the following weight percentages: calcium oxide expanded clinker 20~25%, and ultra-fine slag powder 75~80%. Preferably, the polymerization inhibitor is hydroquinone. Preferably, the mass ratio of the A component to the B component is 1:0.4.

[0011] Further, the raw materials of the A component are mixed and then subjected to aging reaction, the raw materials of the B component are mixed, and then the mixed A component and B component are uniformly mixed to obtain the acrylic salt grouting material.

[0012] Further, the preparation method of the A component is aging reaction for 7~9h. Preferably, the preparation method of the A component is aging reaction for 8h.

[0013] The acrylic grouting material prepared by only using acrylic acid and magnesium aluminum silicate has problems of no strength, easy to be squeezed out under pressure, etc. After modification by light-burned magnesium oxide, expanded clinker, and ultra-fine slag powder, not only the waterproof performance is significantly improved, but also a certain compressive strength is provided, which can resist a certain water pressure. The expansion type ettringite skeleton generated by the reaction of magnesium acrylate gel and slag powder is combined, so that the concrete cracks are tightly filled, and the excess slurry can penetrate into the interlayer to form a waterproof layer again.

[0014] Further, the raw materials of the fast-hardening inorganic grouting material include powder and water glass in a mass ratio of 10: (3-8), wherein the powder includes the following raw materials in the following weight percentages: sulphoaluminate cement 55-65%, expanding agent 3-10%, calcium hydroxide 2-5%, thickening agent 0.1-0.4%, microbeads 5-10%, ultra-fine stone powder 15-25%, foaming agent 0.005-0.020%, and boric acid 0.04-0.10%. Preferably, the expanding agent is calcium sulphoaluminate expanding agent. Preferably, the thickening agent is cellulose. Preferably, the foaming agent is azodicarbonamide. Preferably, the sulphoaluminate cement is calcium sulphoaluminate cement.

[0015] The ordinary fast-hardening inorganic grouting material has poor fluidity and permeability, is easy to bleed water and slurry, and the impermeability after solidification cannot meet the use requirements. Through the modification of microbeads, water glass, calcium hydroxide and other materials in the present formulation, the fluidity, permeability, integrity and impermeability of the slurry are significantly improved. The microbeads can play the effect of ball bearing and suspension, improving the fluidity and integrity of the slurry. The water glass can promote the generation of CSH gel in the slurry, improving the impermeability of the slurry. The calcium hydroxide can improve the viscosity of the slurry and provide a rich calcium source to promote gel generation.

[0016] Further, the raw materials of the epoxy resin grouting material include resin and curing agent in a mass ratio of 1: (0.2-0.4);

[0017] The resin is obtained by the reaction of 60-80% of epoxy resin and 20-40% of toluene diisocyanate polyurethane prepolymer under the action of a catalyst. Preferably, the catalyst is stannous octoate, and the weight percentage of stannous octoate is 0.1-0.4%. Further, the reaction temperature is 75-85℃, and the reaction time is 1.2-1.8h. Preferably, the reaction temperature is 80℃, and the reaction time is 1.5h. Preferably, the toluene diisocyanate polyurethane prepolymer is a polyurethane prepolymer with an isocyanate content of 8.2%.

[0018] Further, the curing agent is prepared by mixing raw materials including m-toluene diamine, cashew phenol and solid formaldehyde with a mass ratio of 1: (1.1-1.3): (1-1.2) and then dehydrating by heating.

[0019] Further, the heating temperature is 62-68 DEG C, and the heating time is 0.4-0.6 h.

[0020] The conventional epoxy resin grouting material has problems of great brittleness, insufficient flexibility, easy explosive polymerization, etc., the epoxy resin is modified by polyurethane, cashew phenol and other substances, and a special curing agent is matched, the brittleness and flexibility of the epoxy resin are significantly improved, and the epoxy resin has high water resistance and can resist long-term water pressure.

[0021] In the second aspect of the present application, a plugging material used in the method is provided, which includes an acrylic salt grouting material and a fast-hardening inorganic grouting material for filling into a straight deep hole, and an epoxy resin grouting material for filling into an inclined shallow hole.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] (1) The plugging method solves the problem of insufficient grout coverage of concrete structure defects, and realizes all-round filling from inside to outside, ensuring the integrity of the structure.

[0024] (2) The fast-hardening inorganic grouting material significantly improves the flowability, permeability, integrity and impermeability of the grout. The microbeads can play the effect of ball bearing and suspension, improving the flowability and integrity of the grout, the water glass can promote the generation of CSH gel in the grout, improving the impermeability of the grout, and the calcium hydroxide can improve the viscosity of the grout and provide a rich calcium source for promoting gel generation.

[0025] (3) The epoxy resin grouting material has significantly improved brittleness and flexibility, and has high water resistance and can resist long-term water pressure. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The present application is a punching method. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] The application provides a method for plugging through cracks of large-volume macroporous concrete, comprising the following steps: setting a straight deep hole and an inclined shallow hole at the crack, and pouring acrylic grouting material and fast-hardening inorganic grouting material into the straight deep hole in sequence, and pouring epoxy grouting material into the inclined shallow hole.

[0029] In some examples, the crack is a through crack with a diameter of 1-5 mm.

[0030] The punching mode is shown in the figure. Figure 1 The straight deep hole is punched to a position at 2 / 3-1 of the thickness of the concrete structure, the inclined shallow hole is punched to a position at 1 / 3-1 / 2 of the thickness of the concrete structure, and the angle between the inclined shallow hole and the crack is 30-45°.

[0031] The acrylic grouting material and the fast-hardening inorganic grouting material are poured into the straight deep hole in sequence, the acrylic grouting material is poured until the pressure reaches 0.3 Mpa, and the pressure is maintained for 5 min, and then the fast-hardening inorganic grouting material is poured until the pressure reaches 0.5 Mpa, and the pressure is maintained for 5 min.

[0032] In some examples, at the through crack, a straight deep hole is punched perpendicularly to the concrete structure, the diameter of the straight deep hole is 20-28 mm, and the distance between two straight deep holes is 25-35 cm, that is, after each straight deep hole is punched at the through crack, another straight deep hole is punched at a distance of 25-35 cm, and the process is repeated until the crack is finished. The diameter of the inclined shallow hole is 10-14 mm, and the distance between the two inclined shallow holes symmetrically arranged on the two sides of the straight deep hole is 40-70 cm, that is, each straight deep hole corresponds to two inclined shallow holes, and the process is repeated until the crack is finished.

[0033] In some examples, the raw materials of the acrylic grouting material include A component and B component with a mass ratio of (0.9-1.1):(0.35-0.45), wherein the A component includes the following raw materials with the following weight percentages: light-burned magnesium oxide 10-15%, acrylic acid 25-30%, magnesium aluminum silicate 1-5%, water 50-60%, and polymerization inhibitor 0.1-0.4%, and the B component includes the following raw materials with the following weight percentages: calcium oxide expanded clinker 20-25%, and superfine slag powder 75-80%. The raw materials of the A component are mixed and then subjected to aging reaction, the raw materials of the B component are mixed, and then the mixed A component and the B component are uniformly mixed to obtain the acrylic grouting material.

[0034] In some examples, the preparation method of the A component is aging reaction for 7-9 h.

[0035] In some examples, the raw materials of the fast-hardening inorganic grouting material include, by mass percentage, 10: (3-8) of a powder and a water glass, wherein the powder includes, by weight percentage, 55-65% of a sulphoaluminate cement, 3-10% of an expansive agent, 2-5% of calcium hydroxide, 0.1-0.4% of a thickening agent, 5-10% of microbeads, 15-25% of ultra-fine stone powder, 0.005-0.020% of a foaming agent, and 0.04-0.10% of boric acid.

[0036] In some examples, the raw materials of the epoxy grouting material include, by mass percentage, 1: (0.2-0.4) of a resin and a curing agent.

[0037] The resin is obtained by reacting, by weight percentage, 60-80% of an epoxy resin and 20-40% of a toluene diisocyanate polyurethane prepolymer under the action of a catalyst.

[0038] In some examples, the temperature of the reaction is 75-85°C, and the time of the reaction is 1.2-1.8 h.

[0039] In some examples, the curing agent is obtained by mixing, by mass ratio, 1: (1.1-1.3): (1-1.2) of m-toluene diamine, cardanol, and solid formaldehyde, and then dehydrating and preparing by heating.

[0040] In some examples, the temperature of the heating is 62-68°C, and the time of the heating is 0.4-0.6 h.

[0041] In the following examples and comparative examples, the molecular weight of cellulose is 400, purchased from Shanghai Qishuo Chemical Industry, product model is cellulose 400; ordinary acrylic grouting material is purchased from Guangdong Shuanghong Waterproof and Thermal Insulation Engineering Co., Ltd., the main component is sodium acrylate, the content is 35%; cement-based fast-hard inorganic grouting material is purchased from Zhongxin Xinya Building Material Co., Ltd., product model is CGMXX, the main component is fast-hard sulphoaluminate cement; ordinary epoxy resin grouting material is purchased from Shanghai Weiyou Engineering Technology Co., Ltd., product model is WY-66XX, the main component is bisphenol A epoxy resin, the content is 90%; sulphoaluminate cement is purchased from Yicheng Andate Special Cement Co., Ltd., product model is RSAC425, the main component is calcium sulphoaluminate; calcium sulphoaluminate expansive agent is purchased from Zhengzhou Jianwen Special Material Technology Co., Ltd., product model is HSCA high-performance calcium sulphoaluminate expansive agent; calcium oxide expansion clinker is purchased from Lechang City Sanqiang Building Material Co., Ltd., product model is HSCA, the main component is active calcium oxide; ultra-fine slag powder is purchased from Sichuan Shuangshi Building Material Co., Ltd., product model is S105, the main component is active SiO2 and active alumina; microbeads are purchased from Henan Sanxi Refractory Material Co., Ltd., product model is W95, the main component is silicon dioxide; ultra-fine stone powder is purchased from Ezhou Tiancaiwang Technology Co., Ltd., product model is T200, the main component is calcium carbonate; toluene diisocyanate polyurethane prepolymer is a polyurethane prepolymer with an NCO (isocyanate) content of 8.2%, purchased from Wanhua Chemical Group.

[0042] Example 1

[0043] The present embodiment provides a plugging method for large-volume large-pore concrete through cracks and a material thereof, in particular to:

[0044] As shown in Figure 1 a φ24mm straight deep hole is drilled to 2 / 3 of the thickness of the concrete structure at the crack, and a φ12mm 40° inclined shallow hole is drilled to 1 / 3 of the thickness of the concrete structure on both sides of the crack, and the straight deep holes are spaced 30cm apart.

[0045] The straight deep holes are sequentially filled with acrylic grouting material and fast-hard inorganic grouting material, and the inclined shallow hole is filled with epoxy resin grouting material.

[0046] The raw materials of the acrylic grouting material include A component and B component, which are uniformly stirred according to a mass ratio of 1:0.4 before grouting;

[0047] The A component includes the following raw materials in the following weight percentages: 12% light-burned magnesium oxide, 28% acrylic acid, 3% magnesium aluminum silicate, 56.8% water, and 0.2% hydroquinone, which are prepared by aging reaction for 8h, and the B component includes the following raw materials in the following weight percentages: 22% calcium oxide expansion clinker and 78% ultra-fine slag powder.

[0048] The raw materials of the fast-hardening inorganic grouting material include powder and water glass, and before grouting, the water glass is stirred uniformly with the powder at a mass ratio of 10:5;

[0049] The powder includes the following raw materials in percentage by weight: 60% sulphoaluminate cement, 5% calcium sulphoaluminate expansive agent, 3% calcium hydroxide, 0.2% cellulose, 6.72% microbeads, 25% ultra-fine stone powder, 0.01% azodicarbonamide, and 0.07% boric acid.

[0050] The raw materials of the epoxy grouting material include resin and curing agent, and before grouting, the curing agent is stirred uniformly with the resin at a mass ratio of 1:0.3;

[0051] The resin is prepared by reacting 70% E51 epoxy resin and 30% toluene diisocyanate polyurethane prepolymer under the catalysis of 0.2% stannous octoate at 80°C for 1.5 h;

[0052] The curing agent is prepared by reacting m-toluene diamine, cardanol and solid formaldehyde at a mass ratio of 1.0:1.2:1.1 at 65°C for 0.5 h and then dehydrating at 110°C for 2 h under vacuum.

[0053] Embodiment 2

[0054] The present embodiment provides a plugging method for large-volume large-pore concrete through cracks and a material thereof, in particular to:

[0055] A φ24 mm straight deep hole is drilled to 2 / 3 of the thickness of the concrete structure at the crack, and a φ12 mm 45° inclined shallow hole is drilled to 1 / 3 of the thickness of the concrete structure on both sides of the crack, and the straight deep holes are spaced 30 cm apart.

[0056] The straight deep holes are sequentially filled with acrylic salt grouting material and fast-hardening inorganic grouting material, and the inclined shallow holes are filled with epoxy grouting material.

[0057] The raw materials of the acrylic salt grouting material include A component and B component, and before grouting, the B component is stirred uniformly with the A component at a mass ratio of 1:0.4,

[0058] The A component includes the following raw materials in percentage by weight: 15% light-burned magnesium oxide, 30% acrylic acid, 1% magnesium aluminum silicate, 53.6% water, and 0.4% hydroquinone, which are prepared by aging reaction for 8 h, and the B component includes the following raw materials in percentage by weight: 25% calcium oxide expansive clinker and 75% ultra-fine slag powder.

[0059] The raw materials of the fast-hardening inorganic grouting material include powder and water glass, and before grouting, the water glass is stirred uniformly with the powder at a mass ratio of 10:8;

[0060] The raw materials of the epoxy resin polyurethane epoxy resin grouting material include resin and curing agent, and before grouting, the resin and the curing agent are stirred uniformly according to a mass ratio of 1:0.4.

[0061] The raw materials of the epoxy resin polyurethane epoxy resin grouting material include resin and curing agent, and before grouting, the resin and the curing agent are stirred uniformly according to a mass ratio of 1:0.4.

[0062] The resin is prepared by reacting 80% of E51 epoxy resin and 20% of toluene diisocyanate polyurethane prepolymer under the catalysis of 0.4% of stannous octoate at 80 DEG C for 1.5 h.

[0063] The curing agent is prepared by reacting m-toluene diamine, cardanol and solid formaldehyde according to a mass ratio of 1.0:1.3:1.2 at 65 DEG C for 0.5 h and then dehydrating under vacuum at 110 DEG C for 2 h.

[0064] Example 3

[0065] The present embodiment provides a plugging method for large-volume large-pore concrete through cracks and a material thereof, in particular to:

[0066] A φ24 mm straight deep hole is drilled to 2 / 3 of the thickness of the concrete structure at the crack, and a φ12 mm 30 DEG inclined shallow hole is drilled to 1 / 3 of the thickness of the concrete structure at both sides of the crack, and the straight deep holes are spaced 30 cm apart.

[0067] The straight deep holes are sequentially filled with acrylic salt grouting material and fast-hardening inorganic grouting material, and the inclined shallow holes are filled with epoxy resin grouting material.

[0068] The raw materials of the acrylic salt grouting material include A component and B component, and before grouting, the A component and the B component are stirred uniformly according to a mass ratio of 1:0.4.

[0069] The A component includes the following raw materials in the following weight percentages: 10% light burned magnesium oxide, 25% acrylic acid, 2% magnesium aluminum silicate, 62.9% water, and 0.1% hydroquinone, and the A component is prepared by aging and reacting for 8 h, and the B component includes the following raw materials in the following weight percentages: 20% calcium oxide expansion clinker and 80% ultra-fine slag powder.

[0070] The raw materials of the fast-hardening inorganic grouting material include powder and water glass, and before grouting, the powder and the water glass are stirred uniformly according to a mass ratio of 10:3.

[0071] The powder material comprises the following raw materials in percentage by weight: 59.855% sulphoaluminate cement, 3% calcium sulphoaluminate expansive agent, 2% calcium hydroxide, 0.1% cellulose, 10% microbeads, 25% ultra-fine stone powder, 0.005% azodicarbonamide, and 0.04% boric acid.

[0072] The raw materials of the epoxy resin grouting material include resin and curing agent, which are stirred uniformly at a mass ratio of 1:0.2 before grouting.

[0073] The resin is prepared by reacting 60% E51 epoxy resin and 40% toluene diisocyanate polyurethane prepolymer at 80°C for 1.5 h under the catalysis of 0.1% stannous octoate.

[0074] The curing agent is prepared by reacting m-toluene diamine, cardanol and solid formaldehyde at a mass ratio of 1.0:1.1:1.0 at 65°C for 0.5 h and then dehydrating at 110°C for 2 h under vacuum.

[0075] Example 4

[0076] The plugging method and material for the through cracks of the large-volume large-pore concrete provided in this example 4 are different from those of example 1 in that the straight deep holes are sequentially filled with the ordinary acrylic salt grouting material and the cement-based fast-hard inorganic grouting material.

[0077] Example 5

[0078] The plugging method and material for the through cracks of the large-volume large-pore concrete provided in this example are different from those of example 1 in that the straight deep holes are sequentially filled with the acrylic salt grouting material and the fast-hard inorganic grouting material of the present application, and the inclined shallow holes are filled with the ordinary epoxy resin grouting material.

[0079] Comparative Example 1

[0080] This comparative example only uses the straight deep hole grouting plugging method, and φ24mm straight deep holes are drilled to 2 / 3 of the thickness of the concrete structure, with a spacing of 30cm between each two straight deep holes. This is basically the same as example 1, except that no inclined shallow holes are drilled, and only the straight deep hole grouting plugging method is used. The straight deep holes are sequentially filled with the acrylic salt grouting material and the fast-hard inorganic grouting material of the present application.

[0081] Comparative Example 2

[0082] The comparative example only uses the inclined shallow hole grouting method, and a φ12mm 40° inclined shallow hole is drilled to 1 / 3 of the thickness of the concrete structure, which is basically the same as example 1, except that no straight deep hole is drilled, and only the inclined shallow hole grouting method is used to pour the epoxy resin grouting material of the application into the inclined shallow hole.

[0083] Comparative example 3

[0084] The plugging method and material provided by the comparative example are basically the same as example 1, except that the straight deep hole of the comparative example is sequentially poured into the fast-hard inorganic grouting material of the application, the acrylic salt grouting material of the application, and the epoxy resin grouting material of the application is poured into the inclined shallow hole.

[0085] Comparative example 4

[0086] The plugging method and material provided by the comparative example are basically the same as example 1, except that the straight deep hole of the comparative example is sequentially poured into the ordinary acrylic salt grouting material, the fast-hard inorganic grouting material of the application, and the epoxy resin grouting material of the application is poured into the inclined shallow hole.

[0087] Comparative example 5

[0088] The plugging method and material provided by the comparative example are basically the same as example 1, except that the straight deep hole of the comparative example is sequentially poured into the ordinary acrylic salt grouting material, the fast-hard inorganic grouting material of the application, and the epoxy resin grouting material of the application is poured into the inclined shallow hole.

[0089] Application example

[0090] The performance of the plugging method provided by the above examples and comparative examples is tested, and the results are shown in Tables 1 and 2.

[0091] In the examples 1-5 of the present application, each performance index exceeds or even far exceeds the industry standard index requirement. After engineering test, the re-leakage time is 13 months or more. In the comparative example 1, straight deep hole grouting is used, and due to the fact that the fine cracks in the concrete structure cannot be filled, re-leakage occurs at 6 months. In the comparative example 2, oblique shallow hole grouting is used, and the large cracks in the deep part cannot be effectively filled, resulting in a shorter re-leakage time of only 4 months. In the comparative example 3, the order of the acrylic salt grouting material and the fast-hard inorganic grouting material of the present application is changed during straight deep hole grouting, and the re-leakage time is shortened to 9 months. Since the acrylic salt grouting material of the present application has strong permeability, it can first be grouted by the acrylic salt grouting material of the present application, which can quickly penetrate deep and form a waterproof layer on the water-facing surface, greatly enhancing the waterproof effect. When the water glass fast-hard inorganic grouting material with low permeability is used as the first grouting material, this effect cannot be achieved. In the comparative example 4, the straight deep hole grouting material is replaced by the ordinary acrylic salt grouting material, and the compressive strength and permeability coefficient of the sand consolidation body are significantly reduced, and the re-leakage time is shortened to 10 months. Since the ordinary acrylic salt has low strength and small density, it can be easily squeezed out due to excessive water pressure, resulting in a shortened re-leakage time. In the comparative example 5, ordinary acrylic salt and ordinary cement-based fast-hard inorganic grouting material are used in straight deep hole grouting. Since they are not modified, the density of large pores and the resistance to extrusion under water pressure are greatly reduced, resulting in a re-leakage time of only 7 months.

[0092] Table 1 Test results of examples

[0093]

[0094] Table 2 Test results of comparative examples

[0095]

[0096] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for plugging through cracks in large-volume and large-pore concrete, characterized in that: A straight deep hole and an inclined shallow hole are set at the crack, and acrylate grouting material and fast-hardening inorganic grouting material are poured into the straight deep hole in sequence, and epoxy resin grouting material is poured into the inclined shallow hole; the straight deep hole is drilled at the crack to 2 / 3~1 of the thickness of the concrete structure, and the inclined shallow hole is drilled at 30~45 degrees on both sides of the crack to 1 / 3~1 / 2 of the thickness of the concrete structure.

2. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the acrylate grouting material include component A and component B in a mass ratio of (0.9-1.1): (0.35-0.45), wherein component A includes the following raw materials in weight percentage: 10-15% light-burned magnesium oxide, 25-30% acrylic acid, 1-5% magnesium aluminum silicate, 50-60% water and 0.1-0.4% polymerization inhibitor; component B includes the following raw materials in weight percentage: 20-25% calcium oxide expanded clinker and 75-80% ultrafine slag powder.

3. A method for plugging through cracks in large-volume and large-pore concrete according to claim 2, characterized in that: The raw materials of the component A are mixed and then aged, the raw materials of the component B are mixed, and then the mixed components A and B are evenly mixed to obtain the acrylate grouting material.

4. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the fast-hardening inorganic grouting material include powder and water glass in a mass percentage of 10: (3~8), wherein the powder includes the following raw materials in weight percentage: 55~65% of sulphoaluminate cement, 3~10% of expansion agent, 2~5% of calcium hydroxide, 0.1~0.4% of thickener, 5~10% of microbeads, 15~25% of ultrafine stone powder, 0.005~0.020% of foaming agent, and 0.04~0.10% of boric acid.

5. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the epoxy resin grouting material include resin and curing agent in a mass percentage of 1: (0.2~0.4); The resin is obtained by reacting 60-80% by weight of epoxy resin and 20-40% by weight of toluene diisocyanate polyurethane prepolymer under the action of a catalyst.

6. A method for plugging through cracks in large-volume and large-pore concrete according to claim 5, characterized in that: The reaction temperature is 75-85° C., and the reaction time is 1.2-1.8 h.

7. A method for plugging through cracks in large-volume and large-pore concrete according to claim 5, characterized in that: The curing agent is prepared by mixing raw materials including m-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1:(1.1-1.3):(1-1.2), heating and dehydrating the mixture.

8. A method for plugging through cracks in large-volume and large-pore concrete according to claim 7, characterized in that: The heating temperature is 62-68° C., and the heating time is 0.4-0.6 h.

9. The plugging material used in the method according to any one of claims 1 to 7, characterized in that: It includes acrylate grouting materials and fast-hardening inorganic grouting materials for filling straight deep holes, as well as epoxy resin grouting materials for filling inclined shallow holes.

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