Solid-waste-based grouting material suitable for subsea tunnel lining repair and preparation method of solid-waste-based grouting material

Abstract

The invention relates to a solid waste-based grouting material suitable for subsea tunnel lining repair and a preparation method thereof. The solid waste-based grouting material comprises the following raw materials in parts by mass: 30-40 parts of shell powder; 20 to 25 parts of concrete recycled micro powder; 10 to 15 parts of gypsum; 5-10 parts of steel slag; 0.8 to 2 parts of silica fume; 0.3 to 1.1 parts of a curing agent; 0.3 to 0.8 part of an adsorbent; and 40 to 50 parts of seawater. The solid-waste-based high-strength delayed-coagulation type cementing material is prepared by adopting a synergistic mode of ocean solid waste and industrial solid waste and a synergistic excitation mode, and the adopted raw materials are all solid wastes, so that the consumption of natural resources is reduced, and the method has the advantages of energy conservation, carbon reduction, low cost and the like; the obtained solid-waste-based grouting repairing material is good in mechanical strength, and the problem of contradiction between the performance and the cost of a repairing material prepared from solid waste is solved.

Description

Technical Field

[0001] The present application relates to a solid waste-based grouting material suitable for repairing submarine tunnel linings and a preparation method thereof. Background Art

[0002] Subsea tunnel lining repair is a crucial technical measure to ensure the safety and durability of tunnel structures. Subsea tunnels are subject to high water pressure, highly corrosive seawater, and complex geological environments for extended periods. Linings are susceptible to cracking, leakage, or spalling due to factors such as concrete carbonization, chloride ion penetration, and uneven structural stress. In severe cases, these issues can lead to steel corrosion and lining hollowing, threatening the overall stability of the tunnel. As the scale of subsea tunnel construction expands globally, the development of repair technology has significant engineering value in reducing operation and maintenance costs and promoting the development of a green, low-carbon maintenance system.

[0003] Currently, the materials used for submarine tunnel lining repair primarily include Portland cement and chemical grouting materials. Conventional cement-based submarine tunnel repair materials suffer from shortcomings such as poor corrosion resistance and high carbon emissions, while polymer-based submarine tunnel repair materials suffer from high cost and toxicity. Therefore, the development of a new, green, low-carbon, high-strength, and highly corrosion-resistant submarine tunnel lining repair material is urgently needed. Summary of the Invention

[0004] To address the above-mentioned issues, the present application proposes, on the one hand, a solid waste-based grouting material suitable for repairing submarine tunnel linings, comprising the following raw materials in parts by weight: shell powder: 30-40 parts; concrete recycled powder: 20-25 parts; gypsum: 10-15 parts; steel slag: 5-10 parts; silica fume: 0.8-2 parts; curing agent: 0.3-1.1 parts; adsorbent: 0.3-0.8 parts; and seawater: 40-50 parts. The present invention utilizes a synergistic approach with marine solid waste and industrial solid waste to prepare a solid waste-based high-strength, slow-setting cementitious material through synergistic stimulation. The raw materials used are all solid waste, which reduces the consumption of natural resources and has the advantages of energy conservation, carbon reduction, and low cost. The resulting solid waste-based grouting repair material has good mechanical strength, resolving the contradiction between the performance and cost of repair materials prepared from solid waste.

[0005] Preferably, the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of potassium silicate to potassium hydroxide is 2-3:1; The adsorbent is a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide is 0.8-1.2:1. The present application adopts a composite of xanthan gum and graphene oxide, which plays a role in adhering to materials such as shell powder, steel slag, and concrete recycled micropowder, and can also improve the adsorption capacity of the present application, so that the grouting repair material obtained by the present application has sufficient Cl - 、SO4 2- Corrosion ability.

[0006] Preferably, the shell powder is one of oyster shells, scallop shells, clam shells, conch shells, and abalone shells, or a mixture of any two or more materials in any proportion, and the particle size of the shell powder is 20-50 meshes. This application is based on recycled materials such as shell powder and steel slag, and directly uses seawater as a water source, which greatly reduces costs, and utilizes the steel slag itself for Cl - 、SO4 2- It has an adsorption effect, thereby improving the corrosion resistance of the new repair material. Silica fume, steel slag, shell powder, etc. generate NCSAH gel, thereby improving the mechanical strength of the material and the density of the stone body. In addition, silica fume has the filling effect of ultrafine materials, further preventing Cl - 、SO4 2- The role of invasion.

[0007] Preferably, the particle size of the recycled concrete powder is 200-500 mesh; The content of CaSO4·H2O in the gypsum is not less than 90 wt%.

[0008] On the other hand, a method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings is also disclosed, comprising the following steps: Steel slag modification: Raw material mixing: Fully mixing steel slag with an adsorbent, a curing agent, recycled concrete powder, and 1 / 4-1 / 3 of the total amount of seawater to obtain a first mixture; Thoroughly mixing the silica fume, shell powder, gypsum and remaining seawater to obtain a second mixture; The first mixture and the second mixture are fully mixed to obtain a grouting material.

[0009] Preferably, the steel slag modification is carried out in the following manner: Mixing organic acid, original steel slag, and water 3-4 times the total mass of the organic acid and the original steel slag; Heat to 50-60°C, stir thoroughly for 0.5h and filter; The slag is then dried at 100-110°C for 3-4 hours, ground, and sieved to obtain a modified steel slag with a particle size of less than 50 mesh. This application addresses the problem that traditional steel slag has a high content of free calcium oxide, and its direct use in the preparation of cementitious materials may cause the stone body to expand, which in turn causes expansion and cracking of the submarine tunnel lining repair body. By modifying the slag with citric acid, the problem of poor volume stability of traditional steel slag is solved. Furthermore, the calcium citrate generated by the reaction of citric acid and free calcium oxide has the dual effects of salt excitation and increasing the bonding properties of the slurry, which can further enhance the mechanical strength of the grouting repair material and its bonding ability with the existing submarine tunnel lining.

[0010] Preferably, the organic acid is citric acid.

[0011] Preferably, the first mixture is obtained as follows: Dry-mix the adsorbent and concrete recycled micro powder evenly; The curing agent is added into the seawater and then continuously stirred. After the curing agent is completely dissolved, the modified steel slag is added and fully stirred and mixed. Then, the dry-mixed adsorbent and concrete recycled micropowder are added and continuously stirred to obtain a first mixture.

[0012] Preferably, the obtained first mixture is ball-milled for no less than 30 minutes.

[0013] Preferably, the second mixture is prepared as follows: Add shell powder and gypsum to the remaining seawater, then ball mill for no less than 30 minutes, then add silicon powder, and mix thoroughly to obtain a second mixture.

[0014] This application can bring the following beneficial effects: 1. The present invention adopts a synergistic approach of marine solid waste and industrial solid waste to prepare a solid waste-based high-strength, slow-setting cementitious material through synergistic stimulation. The raw materials used are all solid waste, which reduces the consumption of natural resources and has the advantages of energy saving, carbon reduction and low cost. The obtained solid waste-based grouting repair material has good mechanical strength, which solves the contradiction between the performance and cost of repair materials prepared from solid waste.

[0015] 2. This application uses xanthan gum and graphene oxide composite, which plays the role of adhering to shell powder, steel slag, concrete recycled micro powder and other materials, and can also improve the adsorption capacity of this application, so that the grouting repair material obtained in this application has sufficient Cl - 、SO4 2- Corrosion ability.

[0016] 3. This application is based on recycled materials such as shell powder and steel slag, and directly uses seawater as a water source, which greatly reduces costs and utilizes the steel slag itself for Cl - 、SO4 2- It has an adsorption effect, thereby improving the corrosion resistance of the new repair material. Silica fume, steel slag, shell powder, etc. generate NCSAH gel, thereby improving the mechanical strength of the material and the density of the stone body. In addition, silica fume has the filling effect of ultrafine materials, further preventing Cl - 、SO4 2- The role of invasion.

[0017] 4. This application addresses the problem that traditional steel slag has a high content of free calcium oxide, and that direct use in the preparation of cementitious materials may cause stone expansion, which in turn leads to expansion and cracking of submarine tunnel lining repair bodies. By modifying the slag with citric acid, the problem of poor volume stability of traditional steel slag is solved. Moreover, the calcium citrate generated by the reaction of citric acid and free calcium oxide has the dual effects of salt excitation and increasing the bonding properties of the slurry, which can further enhance the mechanical strength of the grouting repair material and its bonding ability with the existing submarine tunnel lining. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this application is described in detail below through specific implementation methods.

[0019] The composition of the solid waste-based grouting material for submarine tunnel lining repair includes the following raw materials in parts by mass: shell powder: 30-40 parts; concrete recycled fine powder: 20-25 parts; gypsum: 10-15 parts; steel slag: 5-10 parts; silica fume: 0.8-2 parts; curing agent: 0.3-1.1 parts; adsorbent: 0.3-0.8 parts; and seawater: 40-50 parts.

[0020] The curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2-3:1; The adsorbent is a mixture of xanthan gum and graphene oxide, and the mass ratio of the xanthan gum to the graphene oxide is 0.8-1.2:1.

[0021] The organic acid is citric acid.

[0022] The shell powder is one of oyster shells, scallop shells, clam shells, conch shells, and abalone shells, or a mixture of any two or more of the materials in any proportion. The particle size of the shell powder is 20-50 meshes.

[0023] The particle size of the concrete recycled fine powder is 200-500 mesh; The content of CaSO4·H2O in the gypsum is not less than 90 wt%.

[0024] The preparation method comprises the following steps: S1.Steel slag modification: The slag modification is carried out as follows: Mix 1-2 parts of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 3-4 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50-60°C, stir thoroughly for 0.5h and filter; Then, the slag is dried at 100-110° C. for 3-4 hours, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0025] S2. Preparation of the first mixture Thoroughly mixing 5-10 parts of steel slag, 0.3-0.8 parts of an adsorbent, 0.3-1.1 parts of a curing agent, 20-25 parts of recycled concrete powder, and 1 / 4-1 / 3 of the total amount of 40-50 parts of seawater to obtain a first mixture; The first mixture is obtained as follows: Dry mix 0.3-0.8 parts of adsorbent with 20-25 parts of concrete recycled micro powder; 0.3-1.1 parts of curing agent are added to 1 / 4-1 / 3 of the total seawater of 40-50 parts, and then continuously stirred. After the curing agent is completely dissolved, 5-10 parts of modified steel slag are added and thoroughly stirred and mixed. Then, 0.3-0.8 parts of dry-mixed adsorbent and 20-25 parts of concrete recycled fine powder are added and continuously stirred to obtain a first mixture.

[0026] The obtained first mixture was ball-milled for not less than 30 min.

[0027] S3. Preparation of the Second Mixture Thoroughly mixing 0.8-2 parts of silica fume, 30-40 parts of shell powder, 10-15 parts of gypsum, and the remaining seawater to obtain a second mixture; The second mixture is prepared as follows: 30-40 parts of shell powder and 10-15 parts of gypsum are added to the remaining seawater, and then ball milled for not less than 30 minutes, and then 0.8-2 parts of silicon powder are added and mixed thoroughly to obtain a second mixture.

[0028] S4. Mixing Preparation The first mixture and the second mixture are fully mixed to obtain a grouting material.

[0029] For grouting materials, the compressive and flexural strength are tested in accordance with GB / T17671-2021, the bonding strength is tested in accordance with JGJ / T70-2009, the chloride ion corrosion resistance coefficient is tested in accordance with GB / T50082-2009, and the sulfate corrosion resistance coefficient is tested in accordance with GB / T749-2008.

[0030] In order to characterize the effectiveness of the grouting material obtained in this application, the following examples are made. The seawater used in the following examples is seawater from Qingdao sea area, and the substance content therein is:

[0031] Example 1: S101.Steel slag modification: The slag modification is carried out as follows: Mix 1 part of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 3 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50°C, stir thoroughly for 0.5h and filter; Then, the slag was dried at 100° C. for 4 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0032] S102. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micropowder were dry-mixed evenly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 0.8:1; Adding 0.3 parts of a curing agent to 1 / 4 of the total amount of 40 parts of seawater, and then continuously stirring, after the curing agent is completely dissolved, adding 5 parts of modified steel slag and thoroughly stirring and mixing, and then adding 0.3 parts of a dry-mixed adsorbent and 20 parts of concrete recycled fine powder and continuously stirring to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2:1; The obtained first mixture was ball-milled for 30 min.

[0033] S103. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes. Then, 0.8 parts of silicon powder was added and mixed thoroughly to obtain a second mixture.

[0034] S104. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 1.

[0035] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 1 grouting material were measured: 28d flexural strength: 4.1MPa; 28d compressive strength: 21.3MPa; Anti-SO4 2- Erosion coefficient: 1.07; Anti-Cl - Erosion coefficient: 1.06; Bond strength: 2.1MPa.

[0036] Example 2: S201.Steel slag modification: The slag modification is carried out as follows: Mix 2 parts of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 4 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 60°C, stir thoroughly for 0.5h and filter; Then, the product is dried at 110° C. for 3 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0037] S202. Preparation of the first mixture 0.8 parts of adsorbent and 25 parts of concrete recycled micropowder were dry-mixed uniformly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 1.2:1; 1.1 parts of a curing agent is added to 1 / 3 of the total amount of 50 parts of seawater, and then continuously stirred. After the curing agent is completely dissolved, 10 parts of modified steel slag are added and thoroughly stirred and mixed. Then, 0.8 parts of a dry-mixed adsorbent and 25 parts of recycled concrete powder are added and continuously stirred to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 3:1; The obtained first mixture was ball-milled for 30 min.

[0038] S203. Preparation of the second mixture 40 parts of shell powder and 15 parts of gypsum were added to the remaining seawater, and then ball-milled for not less than 30 minutes. Then, 2 parts of silicon powder were added and mixed thoroughly to obtain a second mixture.

[0039] S204. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 2.

[0040] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 2 grouting material were measured: 28d flexural strength: 4.8MPa; 28d compressive strength: 23.2MPa; Anti-SO4 2- Erosion coefficient: 1.11; Anti-Cl - Erosion coefficient: 1.09; Bond strength: 2.4MPa.

[0041] In order to demonstrate the effectiveness of this application, the following comparative examples are made: Example 3: S301. Steel slag modification: The slag modification is carried out as follows: Mix 1 part of hydrochloric acid (HCl concentration 10 wt%), 10 times the mass of the original steel slag by weight of the hydrochloric acid, and 3 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50°C, stir thoroughly for 0.5h and filter; Then, the slag was dried at 100° C. for 4 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0042] S302. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micropowder were dry-mixed uniformly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 0.8:1; Adding 0.3 parts of a curing agent to 1 / 4 of the total amount of 40 parts of seawater, and then continuously stirring, after the curing agent is completely dissolved, adding 5 parts of modified steel slag and thoroughly stirring and mixing, and then adding 0.3 parts of a dry-mixed adsorbent and 20 parts of concrete recycled fine powder and continuously stirring to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2:1; The obtained first mixture was ball-milled for 30 min.

[0043] S303. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes. Then, 0.8 parts of silicon powder was added and mixed thoroughly to obtain a second mixture.

[0044] S304. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 3.

[0045] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 3 grouting material were measured: 28d flexural strength: 3.1MPa; 28d compressive strength: 16.3MPa; Anti-SO4 2- Erosion coefficient: 0.87; Anti-Cl - Erosion coefficient: 0.89; Bond strength: 1.6MPa.

[0046] Example 4: S401. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micropowder were dry-mixed uniformly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 0.8:1; Adding 0.3 parts of a curing agent to 1 / 4 of the total amount of 40 parts of seawater, and then continuously stirring, after the curing agent is completely dissolved, adding 5 parts of unmodified steel slag and thoroughly stirring and mixing, and then adding 0.3 parts of a dry-mixed adsorbent and 20 parts of concrete recycled fine powder and continuously stirring to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2:1; The obtained first mixture was ball-milled for 30 min.

[0047] S402. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes. Then, 0.8 parts of silicon powder was added and mixed thoroughly to obtain a second mixture.

[0048] S403. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 4.

[0049] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 4 grouting material were measured: 28d flexural strength: 3.8MPa; 28d compressive strength: 20.2MPa; Anti-SO4 2- Erosion coefficient: 0.92; Anti-Cl - Erosion coefficient: 0.94; Bond strength: 2.1MPa.

[0050] Example 5: S:501.Steel slag modification: The slag modification is carried out as follows: Mix 1 part of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 3 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50°C, stir thoroughly for 0.5h and filter; Then, the slag was dried at 100° C. for 4 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0051] S502. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micro powder were dry mixed evenly; the adsorbent was xanthan gum; Adding 0.3 parts of a curing agent to 1 / 4 of the total amount of 40 parts of seawater, and then continuously stirring, after the curing agent is completely dissolved, adding 5 parts of modified steel slag and thoroughly stirring and mixing, and then adding 0.3 parts of a dry-mixed adsorbent and 20 parts of concrete recycled fine powder and continuously stirring to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2:1; The obtained first mixture was ball-milled for 30 min.

[0052] S503. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes. Then, 0.8 parts of silicon powder was added and mixed thoroughly to obtain a second mixture.

[0053] S504. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 5.

[0054] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 5 grouting material were measured: 28d flexural strength: 4.6MPa; 28d compressive strength: 22.8MPa; Anti-SO4 2- Erosion coefficient: 0.99; Anti-Cl - Erosion coefficient: 1.01; Bond strength: 2.2MPa.

[0055] Example 6: S601.Steel slag modification: The slag modification is carried out as follows: Mix 1 part of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 3 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50°C, stir thoroughly for 0.5h and filter; Then, the slag was dried at 100° C. for 4 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0056] S602. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micropowder were dry-mixed evenly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 0.8:1; 0.3 parts of a curing agent is added to 1 / 4 of 40 parts of seawater, and then continuously stirred. After the curing agent is completely dissolved, 5 parts of modified steel slag are added and thoroughly stirred. Then, 0.3 parts of a dry-mixed adsorbent and 20 parts of recycled concrete powder are added and continuously stirred to obtain a first mixture; the curing agent is potassium silicate; The obtained first mixture was ball-milled for 30 min.

[0057] S603. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes. Then, 0.8 parts of silicon powder was added and mixed thoroughly to obtain a second mixture.

[0058] S604. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 6.

[0059] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 6 grouting material were measured: 28d flexural strength: 4.0MPa; 28d compressive strength: 21.7MPa; Anti-SO4 2- Erosion coefficient: 1.02; Anti-Cl - Erosion coefficient: 1.00; Bond strength: 2.1MPa.

[0060] Example 7: S701. Steel slag modification: The slag modification is carried out as follows: Mix 1 part of citric acid, 10 times the mass of the original steel slag by weight of the citric acid, and 3 times the total mass of the organic acid and the original steel slag by weight of water; Heat to 50°C, stir thoroughly for 0.5h and filter; Then, the slag was dried at 100° C. for 4 h, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

[0061] S702. Preparation of the first mixture 0.3 parts of adsorbent and 20 parts of concrete recycled micropowder were dry-mixed uniformly; the adsorbent was a mixture of xanthan gum and graphene oxide, and the mass ratio of xanthan gum to graphene oxide was 0.8:1; Adding 0.3 parts of a curing agent to 1 / 4 of the total amount of 40 parts of seawater, and then continuously stirring, after the curing agent is completely dissolved, adding 5 parts of modified steel slag and thoroughly stirring and mixing, and then adding 0.3 parts of a dry-mixed adsorbent and 20 parts of concrete recycled fine powder and continuously stirring to obtain a first mixture; the curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2:1; The obtained first mixture was ball-milled for 30 min.

[0062] S703. Preparation of the second mixture 30 parts of shell powder and 10 parts of gypsum were added to the remaining seawater, and then ball-milled for 30 minutes and fully mixed to obtain a second mixture.

[0063] S704. Mixing preparation The first mixture and the second mixture are fully mixed to obtain grouting material No. 7.

[0064] Based on the T / DGGC021-2022 Technical Standard for Shield-Type Tunnel Reinforcement and Segment Repair, the following properties of No. 7 grouting material were measured: 28d flexural strength: 2.6MPa; 28d compressive strength: 18.1MPa; Anti-SO4 2- Erosion coefficient: 0.78; Anti-Cl - Erosion coefficient: 0.81; Bond strength: 1.8MPa.

[0065] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A solid waste-based grouting material suitable for repairing submarine tunnel linings, characterized by: The raw materials include the following parts by weight: shell powder: 30-40 parts; concrete recycled powder: 20-25 parts; gypsum: 10-15 parts; steel slag: 5-10 parts; Silica fume: 0.8-2 parts; Curing agent: 0.3-1.1 parts; Adsorbent: 0.3-0.8 parts; Sea water: 40-50 parts.

2. The solid waste-based grouting material suitable for submarine tunnel lining repair according to claim 1, characterized in that: The curing agent is a mixture of potassium silicate and potassium hydroxide, and the mass ratio of the potassium silicate to potassium hydroxide is 2-3:1; The adsorbent is a mixture of xanthan gum and graphene oxide, and the mass ratio of the xanthan gum to the graphene oxide is 0.8-1.2:

1.

3. The solid waste-based grouting material suitable for submarine tunnel lining repair according to claim 1, characterized in that: The shell powder is one of oyster shells, scallop shells, clam shells, conch shells, and abalone shells, or a mixture of any two or more of the materials in any proportion. The particle size of the shell powder is 20-50 meshes.

4. The solid waste-based grouting material suitable for submarine tunnel lining repair according to claim 1, characterized in that: The particle size of the concrete recycled fine powder is 200-500 mesh; The content of CaSO4·H2O in the gypsum is not less than 90 wt%.

5. A method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to any one of claims 1 to 4, characterized in that: The steps include: Steel slag modification: Raw material mixing: Fully mixing steel slag with an adsorbent, a curing agent, recycled concrete powder, and 1 / 4-1 / 3 of the total amount of seawater to obtain a first mixture; Thoroughly mixing the silica fume, shell powder, gypsum and remaining seawater to obtain a second mixture; The first mixture and the second mixture are fully mixed to obtain a grouting material.

6. The method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to claim 5, characterized in that: The slag modification is carried out as follows: Mixing organic acid, original steel slag, and water 3-4 times the total mass of the organic acid and the original steel slag; Heat to 50-60°C, stir thoroughly for 0.5h and filter; Then, the slag is dried at 100-110° C. for 3-4 hours, ground, and sieved to obtain modified steel slag with a particle size of less than 50 mesh.

7. The method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to claim 6, characterized in that: The organic acid is citric acid.

8. The method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to claim 6, characterized in that: The first mixture is obtained as follows: Dry-mix the adsorbent and concrete recycled micro powder evenly; The curing agent is added into the seawater and then continuously stirred. After the curing agent is completely dissolved, the modified steel slag is added and fully stirred and mixed. Then, the dry-mixed adsorbent and concrete recycled micropowder are added and continuously stirred to obtain a first mixture.

9. The method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to claim 8, characterized in that: The obtained first mixture was ball-milled for not less than 30 min.

10. The method for preparing a solid waste-based grouting material suitable for repairing submarine tunnel linings according to claim 6, characterized in that: The second mixture is prepared as follows: Add shell powder and gypsum to the remaining seawater, then ball mill for no less than 30 minutes, then add silicon powder, and mix thoroughly to obtain a second mixture.

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