A solidified composite material for rotary jetting piles and bite piles and a preparation method thereof

Abstract

The present application relates to the technical field of solidified composite material, in particular to a kind of solidified composite material for rotary jetting pile and bite pile and preparation method, the solidified composite material includes the following weight parts raw materials: Portland cement 55~65 parts, slag powder 15~20 parts, desulfurization gypsum 7~11 parts, functional combined agent 8~13 parts, modified sodium silicate agent 5~8 parts, polycarboxylic acid water reducing agent 2~3 parts, water 30~40 parts.The solidified composite material of the application uses Portland cement in combination with slag powder, desulfurization gypsum, while adding functional combined agent, modified sodium silicate agent to blend and optimize, the strength, fluidity and water resistance of the product made are improved, and the salt-tolerant and cold-heat-resistant stability of the product are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of cured composite materials technology, specifically to a cured composite material for jet grouting piles and interlocking piles, and its preparation method. Background Technology

[0002] In modern civil engineering construction, jet grouting piles and interlocking piles are commonly used foundation treatment and excavation support methods. Their construction quality and material properties directly affect the safety and durability of the project. Existing solidification materials often cannot simultaneously meet the different construction requirements of jet grouting piles and interlocking piles. Jet grouting pile construction requires materials with good fluidity, while interlocking piles have higher requirements for material strength. However, increased fluidity can easily affect compressive strength and impermeability. The challenge of this invention lies in coordinating the product's strength, fluidity, and impermeability, as well as the product's poor resistance to salt and alkali and its resistance to cold and heat, which limits the product's efficiency. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a cured composite material for jet grouting piles and interlocking piles and a preparation method thereof, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] This invention provides a cured composite material for jet grouting piles and interlocking piles, the cured composite material comprising the following raw materials in parts by weight:

[0006] 55-65 parts silicate cement, 15-20 parts slag powder, 7-11 parts desulfurized gypsum, 8-13 parts functional binder, 5-8 parts modified sodium silicate agent, 2-3 parts polycarboxylate superplasticizer, and 30-40 parts water.

[0007] Preferably, the slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

[0008] Preferably, the preparation method of the functional combination agent is as follows:

[0009] S01: Mix montmorillonite and titanium dioxide at a weight ratio of (3~5):2 to obtain a homogenized material. Place the homogenized material in water at a weight ratio of 5~8 times the total weight of the homogenized material. Then add 4~7% of the total weight of the homogenized material Tris buffer solution and stir evenly to obtain a Tris dispersion.

[0010] S02: Dissolve 5-10 parts by weight of tannic acid in 35-40 parts by weight of water, then add 20-25 parts by weight of ethanol and 4-7 parts by weight of silane coupling agent, stir at 55-58℃ for 1 hour, stirring speed 150-170 r / min, and after stirring is finished, tannic acid solution is obtained.

[0011] S03: Nano-zirconia is added to tannic acid solution at a weight ratio of 3:(5~7) and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution is obtained.

[0012] Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:(7~9) and stirred until homogeneous. Then, the mixture was filtered and dried to obtain carbon nanotube modifier.

[0013] S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid are mixed at a weight ratio of (5~7):3 and ball-milled. After ball milling, the mixture is filtered and dried to obtain the functional complex.

[0014] Preferably, the silane coupling agent is γ-aminopropyltriethoxysilane; the pH of the Tris buffer solution is 8.0~9.0.

[0015] Preferably, the ultrasonic power of the ultrasonic treatment in S03 is 350~400W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed of the ball milling treatment in S04 is 1000~1500 r / min, and the ball milling lasts for 2 hours.

[0016] Preferably, the modified sodium silicate agent is prepared by:

[0017] S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:(5~6), with an ultrasonic power of 300W for 1 hour. After ultrasonic treatment, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica.

[0018] S02: Prepare a sodium silicate solution with a mass fraction of 5-8%, then add 3-5 parts of silane coupling agent KH550 and 4-6 parts of lanthanum-modified mesoporous silica to 8-12 parts of sodium silicate solution and stir evenly to obtain sodium silicate solution;

[0019] S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1000~1500 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent.

[0020] Preferably, the lanthanum solution is a lanthanum nitrate solution with a mass fraction of 4-6%; the mesoporous silica has a particle size of 60-100 nm and a pore size of 10-20 nm.

[0021] Preferably, the modified additive is prepared by:

[0022] Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 3-5 parts by weight of barium titanate, 2-4 parts by weight of calcium sulfate whiskers and 5-8 parts by weight of the active solution thoroughly to obtain a modified solution;

[0023] Illite was preheated at 55~60℃ for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:(7~8). After stirring, the mixture was filtered and dried to obtain the modified additive.

[0024] Preferably, the mixing speed for the blending process is 500~550 r / min, and the mixing time is 1 h.

[0025] The present invention also provides a method for preparing a cured composite material for jet grouting piles and interlocking piles, comprising the following steps: weighing raw materials according to the weight parts, mixing and stirring the raw materials thoroughly to obtain the cured composite material of the present invention.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The cured composite material of this invention uses silicate cement combined with slag powder and desulfurized gypsum, and at the same time adds functional binders and modified sodium silicate agents to adjust and optimize it. The strength, flowability and water resistance of the product are coordinated and improved, and the product has significant effects on salt and alkali resistance and cold and heat stability.

[0028] The functional compound is made by blending and optimizing carbon nanotubes with Tris dispersion. The Tris dispersion is made by mixing montmorillonite and titanium dioxide, then blending with Tris buffer, and then dispersing with carbon nanotubes. At the same time, tannic acid-nanozirconia solution is also blended. Through the co-blending and optimization of raw materials, the performance coordination of the functional compound is improved in the system. The tannic acid solution is made by blending tannic acid with silane coupling agent to enhance the interfacial properties between raw materials. At the same time, nanozirconia is blended and ultrasonically treated. Through the improvement of the combination of raw materials, the functional compound is made to optimize the performance coordination and performance stability of the product in the system.

[0029] The modified sodium silicate agent is made by ultrasonic treatment of mesoporous silica with lanthanum nitrate solution, followed by optimization with silane coupling agent KH550 and sodium silicate solution. Further optimization is achieved by co-complementing with modifying additives. The cetyltrimethylammonium bromide in the modifying additives is diluted with water to optimize the system's activity. A modifying solution is prepared by combining barium titanate and calcium sulfate whiskers. The modified solution obtained by adjusting the whisker structure of calcium sulfate whiskers with barium titanate and the active solution can better improve illite. Thus, illite, after preheating, combined with the modified additives obtained from the modifying solution, better synergizes with functional binders in the system, and is supplemented into the system, further enhancing the system's performance. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This embodiment provides a cured composite material for jet grouting piles and interlocking piles, the cured composite material comprising the following parts by weight of raw materials:

[0032] 55-65 parts silicate cement, 15-20 parts slag powder, 7-11 parts desulfurized gypsum, 8-13 parts functional binder, 5-8 parts modified sodium silicate agent, 2-3 parts polycarboxylate superplasticizer, and 30-40 parts water.

[0033] In this embodiment, the slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

[0034] The preparation method of the functional combination agent in this embodiment is as follows:

[0035] S01: Mix montmorillonite and titanium dioxide at a weight ratio of (3~5):2 to obtain a homogenized material. Place the homogenized material in water at a weight ratio of 5~8 times the total weight of the homogenized material. Then add 4~7% of the total weight of the homogenized material Tris buffer solution and stir evenly to obtain a Tris dispersion.

[0036] S02: Dissolve 5-10 parts by weight of tannic acid in 35-40 parts by weight of water, then add 20-25 parts by weight of ethanol and 4-7 parts by weight of silane coupling agent, stir at 55-58℃ for 1 hour, stirring speed 150-170 r / min, and after stirring is finished, tannic acid solution is obtained.

[0037] S03: Nano-zirconia is added to tannic acid solution at a weight ratio of 3:(5~7) and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution is obtained.

[0038] Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:(7~9) and stirred until homogeneous. Then, the mixture was filtered and dried to obtain carbon nanotube modifier.

[0039] S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid are mixed at a weight ratio of (5~7):3 and ball-milled. After ball milling, the mixture is filtered and dried to obtain the functional complex.

[0040] The silane coupling agent in this embodiment is γ-aminopropyltriethoxysilane; the pH value of the Tris buffer is 8.0~9.0.

[0041] In this embodiment, the ultrasonic power of the ultrasonic treatment in S03 is 350~400W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed of the ball milling treatment in S04 is 1000~1500r / min, and the ball milling lasts for 2 hours.

[0042] The preparation method of the modified sodium silicate agent in this embodiment is as follows:

[0043] S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:(5~6), with an ultrasonic power of 300W for 1 hour. After ultrasonic treatment, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica.

[0044] S02: Prepare a sodium silicate solution with a mass fraction of 5-8%, then add 3-5 parts of silane coupling agent KH550 and 4-6 parts of lanthanum-modified mesoporous silica to 8-12 parts of sodium silicate solution and stir evenly to obtain sodium silicate solution;

[0045] S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1000~1500 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent.

[0046] In this embodiment, the lanthanum solution is a lanthanum nitrate solution with a mass fraction of 4-6%; the mesoporous silica has a particle size of 60-100 nm and a pore size of 10-20 nm.

[0047] The preparation method of the modified additive in this embodiment is as follows:

[0048] Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 3-5 parts by weight of barium titanate, 2-4 parts by weight of calcium sulfate whiskers and 5-8 parts by weight of the active solution thoroughly to obtain a modified solution;

[0049] Illite was preheated at 55~60℃ for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:(7~8). After stirring, the mixture was filtered and dried to obtain the modified additive.

[0050] In this embodiment, the mixing speed for the blending process is 500~550 r / min, and the mixing time is 1 h.

[0051] The present embodiment of a method for preparing a cured composite material for jet grouting piles and interlocking piles includes the following steps: weighing raw materials according to the weight parts, mixing and stirring the raw materials thoroughly to obtain the cured composite material of the present invention.

[0052] Example 1:

[0053] This embodiment provides a cured composite material for jet grouting piles and interlocking piles, the cured composite material comprising the following parts by weight of raw materials:

[0054] 55 parts silicate cement, 15 parts slag powder, 7 parts desulfurized gypsum, 8 parts functional binder, 5 parts modified sodium silicate agent, 2 parts polycarboxylate superplasticizer, and 30 parts water.

[0055] In this embodiment, the slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

[0056] The preparation method of the functional combination agent in this embodiment is as follows:

[0057] S01: Montmorillonite and titanium dioxide are mixed at a weight ratio of 3:2 to obtain a homogenate. The homogenate is then placed in water at a weight ratio of 5 times the total weight of the homogenate, followed by the addition of 4% of the total weight of the homogenate Tris buffer solution. The mixture is stirred until homogeneous to obtain a Tris dispersion.

[0058] S02: Dissolve 5 parts by weight of tannic acid in 35 parts by weight of water, then add 20 parts by weight of ethanol and 4 parts by weight of silane coupling agent, stir at 55°C for 1 hour at a stirring speed of 150 r / min, and after stirring is finished, tannic acid solution is obtained.

[0059] S03: Nano-zirconia is added to tannic acid solution at a weight ratio of 3:5 and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution is obtained.

[0060] Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:7 and stirred until homogeneous. Then, the mixture was filtered and dried to obtain a carbon nanotube modifier.

[0061] S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid were mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the mixture was filtered and dried to obtain the functional compound.

[0062] The silane coupling agent in this embodiment is γ-aminopropyltriethoxysilane; the pH of the Tris buffer is 8.0.

[0063] In this embodiment, the ultrasonic power of the ultrasonic treatment in S03 is 350W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed of the ball milling treatment in S04 is 1000 r / min, and the ball milling lasts for 2 hours.

[0064] The preparation method of the modified sodium silicate agent in this embodiment is as follows:

[0065] S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:5, with an ultrasonic power of 300W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica.

[0066] S02: Prepare a sodium silicate solution with a mass fraction of 5%, then add 3 parts of silane coupling agent KH550 and 4 parts of lanthanum-modified mesoporous silica to 8 parts of sodium silicate solution and stir evenly to obtain sodium silicate solution.

[0067] S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1000 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent.

[0068] In this embodiment, the lanthanum solution is a 4% (w / w) lanthanum nitrate solution; the mesoporous silica has a particle size of 60 nm and a pore size of 10 nm.

[0069] The preparation method of the modified additive in this embodiment is as follows:

[0070] Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 3 parts by weight of barium titanate, 2 parts by weight of calcium sulfate whiskers and 5 parts by weight of the active solution thoroughly to obtain a modified solution;

[0071] Illite was preheated at 55°C for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:7. After stirring, the mixture was filtered and dried to obtain the modified additive.

[0072] In this embodiment, the mixing speed for the blending process is 500 r / min, and the mixing time is 1 h.

[0073] The present embodiment of a method for preparing a cured composite material for jet grouting piles and interlocking piles includes the following steps: weighing raw materials according to the weight parts, mixing and stirring the raw materials thoroughly to obtain the cured composite material of the present invention.

[0074] Example 2:

[0075] This embodiment provides a cured composite material for jet grouting piles and interlocking piles, the cured composite material comprising the following parts by weight of raw materials:

[0076] 65 parts silicate cement, 20 parts slag powder, 11 parts desulfurized gypsum, 13 parts functional binder, 8 parts modified sodium silicate agent, 3 parts polycarboxylate superplasticizer, and 40 parts water.

[0077] In this embodiment, the slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

[0078] The preparation method of the functional combination agent in this embodiment is as follows:

[0079] S01: Montmorillonite and titanium dioxide are mixed at a weight ratio of 5:2 to obtain a homogenate. The homogenate is then placed in water at a weight of 8 times the total weight of the homogenate. Finally, 7% of the total weight of the homogenate is added to Tris buffer solution and stirred until homogenized to obtain a Tris dispersion.

[0080] S02: Dissolve 10 parts by weight of tannic acid in 40 parts by weight of water, then add 25 parts by weight of ethanol and 7 parts by weight of silane coupling agent, stir at 58°C for 1 hour at a stirring speed of 170 r / min, and after stirring is finished, tannic acid solution is obtained.

[0081] S03: Nano-zirconia was added to tannic acid solution at a weight ratio of 3:7 and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution was obtained.

[0082] Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:9 and stirred until homogeneous. Then, the mixture was filtered and dried to obtain a carbon nanotube modifier.

[0083] S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid were mixed at a weight ratio of 7:3 and ball-milled. After ball milling, the mixture was filtered and dried to obtain the functional complex.

[0084] The silane coupling agent in this embodiment is γ-aminopropyltriethoxysilane; the pH of the Tris buffer is 9.0.

[0085] In this embodiment, the ultrasonic power of the ultrasonic treatment in S03 is 400W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed of the ball milling treatment in S04 is 1500 r / min, and the ball milling lasts for 2 hours.

[0086] The preparation method of the modified sodium silicate agent in this embodiment is as follows:

[0087] S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:6, with an ultrasonic power of 300W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica.

[0088] S02: Prepare an 8% sodium silicate solution by mass, then add 5 parts of silane coupling agent KH550 and 6 parts of lanthanum-modified mesoporous silica to 12 parts of sodium silicate solution and stir until homogeneous to obtain sodium silicate solution.

[0089] S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1500 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent.

[0090] In this embodiment, the lanthanum solution is a 6% (w / w) lanthanum nitrate solution; the mesoporous silica has a particle size of 100 nm and a pore size of 20 nm.

[0091] The preparation method of the modified additive in this embodiment is as follows:

[0092] Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 5 parts by weight of barium titanate, 4 parts by weight of calcium sulfate whiskers and 8 parts by weight of the active solution thoroughly to obtain a modified solution;

[0093] Illite was preheated at 60°C for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:8. After stirring, the mixture was filtered and dried to obtain the modified additive.

[0094] In this embodiment, the mixing speed for the blending process is 550 r / min, and the mixing time is 1 h.

[0095] The present embodiment of a method for preparing a cured composite material for jet grouting piles and interlocking piles includes the following steps: weighing raw materials according to the weight parts, mixing and stirring the raw materials thoroughly to obtain the cured composite material of the present invention.

[0096] Example 3:

[0097] This embodiment provides a cured composite material for jet grouting piles and interlocking piles, the cured composite material comprising the following parts by weight of raw materials:

[0098] 60 parts silicate cement, 17.5 parts slag powder, 9 parts desulfurized gypsum, 11 parts functional binder, 6.5 parts modified sodium silicate agent, 2.5 parts polycarboxylate superplasticizer, and 35 parts water.

[0099] In this embodiment, the slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

[0100] The preparation method of the functional combination agent in this embodiment is as follows:

[0101] S01: Montmorillonite and titanium dioxide are mixed at a weight ratio of 4:2 to obtain a homogenate. The homogenate is then placed in water at a weight ratio of 6.5 times the total weight of the homogenate. Subsequently, 5.5% of the total weight of the homogenate Tris buffer solution is added and stirred evenly to obtain a Tris dispersion.

[0102] S02: Dissolve 7.5 parts by weight of tannic acid in 37.5 parts by weight of water, then add 22.5 parts by weight of ethanol and 5.5 parts by weight of silane coupling agent, stir at 56.5℃ for 1 hour at a stirring speed of 160 r / min, and after stirring is finished, tannic acid solution is obtained.

[0103] S03: Nano-zirconia is added to tannic acid solution at a weight ratio of 3:6 and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution is obtained.

[0104] Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:8 and stirred until homogeneous. Then, the mixture was filtered and dried to obtain a carbon nanotube modifier.

[0105] S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid were mixed at a weight ratio of 6:3 and ball-milled. After ball milling, the mixture was filtered and dried to obtain the functional complex.

[0106] The silane coupling agent in this embodiment is γ-aminopropyltriethoxysilane; the pH of the Tris buffer is 8.5.

[0107] In this embodiment, the ultrasonic power of the ultrasonic treatment in S03 is 375W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed of the ball milling treatment in S04 is 1250 r / min, and the ball milling lasts for 2 hours.

[0108] The preparation method of the modified sodium silicate agent in this embodiment is as follows:

[0109] S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:5.5 with an ultrasonic power of 300W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica.

[0110] S02: Prepare a sodium silicate solution with a mass fraction of 6.5%, then add 4 parts of silane coupling agent KH550 and 5 parts of lanthanum-modified mesoporous silica to 10 parts of sodium silicate solution and stir evenly to obtain sodium silicate solution;

[0111] S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1250 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent.

[0112] In this embodiment, the lanthanum solution is a 5% (w / w) lanthanum nitrate solution; the mesoporous silica has a particle size of 80 nm and a pore size of 15 nm.

[0113] The preparation method of the modified additive in this embodiment is as follows:

[0114] Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 4 parts by weight of barium titanate, 3 parts by weight of calcium sulfate whiskers and 6.5 parts by weight of the active solution thoroughly to obtain a modified solution;

[0115] illite was preheated at 57.5℃ for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:6. After stirring, the mixture was filtered and dried to obtain the modified additive.

[0116] In this embodiment, the mixing speed for the blending process is 525 r / min, and the mixing time is 1 h.

[0117] The present embodiment of a method for preparing a cured composite material for jet grouting piles and interlocking piles includes the following steps: weighing raw materials according to the weight parts, mixing and stirring the raw materials thoroughly to obtain the cured composite material of the present invention.

[0118] Comparative Example 1:

[0119] Unlike Example 3, no functional combination agent was added.

[0120] Comparative Example 2:

[0121] Unlike Example 3, no carbon nanotube modifier was added in the preparation of the functional combination agent.

[0122] Comparative Example 3:

[0123] Unlike Example 3, the carbon nanotube modifier was not treated with Tris dispersion.

[0124] Comparative Example 4:

[0125] Unlike Example 3, no mixing material was added to the Tris dispersion.

[0126] Comparative Example 5:

[0127] Unlike Example 3, tannic acid-nanozirconia solution was not added in the preparation of the functional combination agent.

[0128] Comparative Example 6:

[0129] Unlike Example 3, no nano-zirconia was added in the preparation of the tannic acid-nano-zirconia solution.

[0130] Comparative Example 7:

[0131] Unlike Example 3, the preparation method of tannic acid solution in the preparation of tannic acid-nanozirconia solution is different: 7.5 parts by weight of tannic acid are dissolved in 37.5 parts by weight of water, stirred at 56.5°C for 1 hour, and stirred at 160 r / min. After stirring is completed, tannic acid solution is obtained.

[0132] Comparative Example 8:

[0133] Unlike Example 3, no modified sodium silicate agent was added.

[0134] Comparative Example 9:

[0135] Unlike Example 3, sodium silicate solution was not added during the preparation of the modified sodium silicate agent.

[0136] Comparative Example 10:

[0137] Unlike Example 3, no lanthanum-modified mesoporous silica was added to the sodium silicate solution.

[0138] Comparative Example 11:

[0139] Unlike Example 3, no modifying additives were added during the preparation of the modified sodium silicate agent.

[0140] Comparative Example 12:

[0141] Unlike Example 3, no preheated illite was added during the preparation of the modified additive.

[0142] Comparative Example 13:

[0143] Unlike Example 3, no modifying liquid treatment was used in the preparation of the modified additive.

[0144] Comparative Example 14:

[0145] Unlike Example 3, barium titanate and calcium sulfate whiskers were not added to the modified solution.

[0146] The following are the results of routine tests: strength, flowability, and water resistance of Examples 1-3 and Comparative Examples 1-14, as well as the salt and alkali resistance and cold and heat stability of the tested products (the products were placed under 5% sodium chloride salt spray for 12 hours, then at 70°C for 12 hours, and finally at 5°C for 12 hours, which constituted one cycle, and the cycle was repeated 10 times).

[0147]

[0148]

[0149] As can be seen from Comparative Examples 1-14 and Examples 1-3;

[0150] The product in Example 3 has excellent 7d compressive strength, flowability and water resistance. The product's performance can be improved in a coordinated manner. At the same time, the product has excellent performance stability under salt and alkali resistance and cold and heat resistance conditions.

[0151] As can be seen from Comparative Examples 1-14 and Example 3, the performance of the product deteriorates significantly when neither the functional combination agent nor the modified sodium silicate agent is added. The product's performance is significantly improved when both are blended and synergistically formulated.

[0152] The functional combination agent was not prepared with carbon nanotube modifier, the carbon nanotube modifier was not treated with Tris dispersion, the Tris dispersion was not mixed with homogenizing agent, the functional combination agent was not prepared with tannic acid-nanozirconia solution, the tannic acid-nanozirconia solution was not prepared with nanozirconia, and the preparation method of tannic acid solution in the preparation of tannic acid-nanozirconia solution was different. The performance of the products all showed a different degree of deterioration.

[0153] The functional combination agent made by combining carbon nanotube modifiers obtained by different methods with a specific tannic acid-nanozirconia solution has the most significant performance effect. At the same time, the performance of the tannic acid-nanozirconia solution obtained by different methods tends to deteriorate. Only the product raw material obtained by the specific method of this invention has the most significant performance effect.

[0154] In the preparation of modified sodium silicate agent, no sodium silicate solution was added, no lanthanum-modified mesoporous silica was added to the sodium silicate solution, no modifying additives were added, no preheated illite was added, no modifying solution treatment was used in the preparation of the modifying additives, and no barium titanate or calcium sulfate whiskers were added to the modifying solution. The performance of the product tends to deteriorate. The modified sodium silicate agent prepared by combining the modifying additive obtained by the specific method of this invention with sodium silicate solution has the most significant performance effect. Other methods are not as effective as those of this invention.

[0155] The performance of the modified additives and sodium silicate solutions obtained by different methods tends to deteriorate. Only the modified additives and sodium silicate solutions obtained by the specific method of this invention show the most significant performance improvement.

[0156] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0157] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cured composite material for jet grouting piles and interlocking piles, characterized in that, The cured composite material comprises the following raw materials in parts by weight: 55-65 parts silicate cement, 15-20 parts slag powder, 7-11 parts desulfurized gypsum, 8-13 parts functional binder, 5-8 parts modified sodium silicate agent, 2-3 parts polycarboxylate superplasticizer, and 30-40 parts water. The preparation method of the functional combination agent is as follows: S01: Mix montmorillonite and titanium dioxide at a weight ratio of (3~5):2 to obtain a homogenized material. Place the homogenized material in water at a weight ratio of 5~8 times the total weight of the homogenized material. Then add 4~7% of the total weight of the homogenized material Tris buffer solution and stir evenly to obtain a Tris dispersion. S02: Dissolve 5-10 parts by weight of tannic acid in 35-40 parts by weight of water, then add 20-25 parts by weight of ethanol and 4-7 parts by weight of silane coupling agent, stir at 55-58℃ for 1 hour, stirring speed 150-170 r / min, and after stirring is finished, tannic acid solution is obtained. S03: Nano-zirconia is added to tannic acid solution at a weight ratio of 3:(5~7) and ultrasonically treated. After ultrasonic treatment, tannic acid-nano-zirconia solution is obtained. Carbon nanotubes were added to Tris dispersion at a weight ratio of 5:(7~9) and stirred until homogeneous. Then, the mixture was filtered and dried to obtain carbon nanotube modifier. S04: Carbon nanotube modifier and tannic acid-nanozirconia liquid are mixed at a weight ratio of (5~7):3 and ball-milled. After ball milling, the mixture is filtered and dried to obtain the functional complex. The preparation method of modified sodium silicate agent is as follows: S01: Mesoporous silica and lanthanum solution were ultrasonically treated at a weight ratio of 3:(5~6), with an ultrasonic power of 300W for 1 hour. After ultrasonic treatment, the mixture was filtered and dried to obtain lanthanum-modified mesoporous silica. S02: Prepare a sodium silicate solution with a mass fraction of 5-8%, then add 3-5 parts of silane coupling agent KH550 and 4-6 parts of lanthanum-modified mesoporous silica to 8-12 parts of sodium silicate solution and stir evenly to obtain sodium silicate solution; S03: Mix the modified additive and sodium silicate solution at a weight ratio of 5:8 and ball mill them at a speed of 1000~1500 r / min for 2 hours. After ball milling, filter and dry to obtain the modified sodium silicate agent. The preparation method of the modified additive is as follows: Add hexadecyltrimethylammonium bromide to deionized water at a weight ratio of 3:7 and stir until homogeneous to obtain an active solution; mix 3-5 parts by weight of barium titanate, 2-4 parts by weight of calcium sulfate whiskers and 5-8 parts by weight of the active solution thoroughly to obtain a modified solution; Illite was preheated at 55~60℃ for 1 hour to obtain preheated illite. The preheated illite and the modification liquid were mixed and stirred at a weight ratio of 5:(7~8). After stirring, the mixture was filtered and dried to obtain the modified additive.

2. The cured composite material for jet grouting piles and interlocking piles according to claim 1, characterized in that, The slag powder is blast furnace slag powder with a specific surface area ≥ 550 m² / Kg; the desulfurized gypsum contains more than 85% calcium sulfate and has a specific surface area ≥ 400 m² / Kg.

3. The cured composite material for jet grouting piles and interlocking piles according to claim 1, characterized in that, The silane coupling agent is γ-aminopropyltriethoxysilane; the pH of the Tris buffer solution is 8.0~9.

0.

4. The cured composite material for jet grouting piles and interlocking piles according to claim 1, characterized in that, The ultrasonic power for ultrasonic treatment described in S03 is 350~400W, and the ultrasonic treatment lasts for 1 hour; the ball milling speed for ball milling treatment described in S04 is 1000~1500r / min, and the ball milling lasts for 2 hours.

5. The cured composite material for jet grouting piles and interlocking piles according to claim 1, characterized in that, The lanthanum solution is a lanthanum nitrate solution with a mass fraction of 4-6%; the mesoporous silica has a particle size of 60-100 nm and a pore size of 10-20 nm.

6. The cured composite material for jet grouting piles and interlocking piles according to claim 1, characterized in that, The mixing speed for the blending process was 500~550 r / min, and the mixing time was 1 h.

7. A method for preparing a cured composite material for jet grouting piles and interlocking piles as described in any one of claims 1 to 6, characterized in that, The process includes the following steps: weighing the raw materials according to their weight proportions, mixing and stirring the raw materials thoroughly to obtain a cured composite material.

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