Novel green synchronous grouting material and preparation method thereof

Abstract

The invention provides a novel green synchronous grouting material and a preparation method thereof, and the synchronous grouting material is prepared from the following raw materials in parts by weight: 5 to 12 parts of cement, 8 to 20 parts of slag, 12 to 25 parts of steel slag, 250 to 350 parts of fine sand containing mud powder, 0.1 to 1.0 part of sodium laurate, 0.03 to 0.2 part of cellulose fiber, 2 to 10 parts of biomass carbon, 0.2 to 1.5 parts of sodium dodecyl sulfate and 20 to 60 parts of water. According to the invention, the silt-containing fine sand is used as a main raw material and is matched with the cement, the slag, the steel slag and the specific additive, so that the obtained synchronous grouting material has excellent strength and also has excellent hydrophobicity and corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of synchronous grouting, more particularly to a novel green synchronous grouting material and a preparation method thereof. BACKGROUND

[0002] Synchronous grouting technology is an essential key auxiliary method in the shield method, and synchronous grouting in shield tunneling is an effective means to fill the building gap between the pipe lining and the stratum and reduce the deformation of the soil in the later period, which can strengthen the stability of the tunnel and is the key to controlling the ground settlement.

[0003] The synchronous grouting slurry is generally cement mortar, which is configured by cement, sand, fly ash, bentonite, and water in a certain proportion. However, with the continuous increase of urban progress and industrialization, environmental pollution is becoming increasingly serious, and the government is paying more and more attention to environmental protection, which makes the prices of raw materials such as cement, bentonite, and sand and gravel materials higher and higher, thereby increasing the cost of synchronous grouting slurry. On the contrary, the shield spoil is extremely abundant in urban subway construction, and if these resources can be effectively utilized to prepare synchronous grouting materials, it will produce huge economic, environmental, and social benefits.

[0004] There are a series of problems in the current domestic and foreign synchronous grouting material technology prepared from spoil: first, poor crack resistance. Cracks in the slurry will reduce the overall strength of the slurry, affecting the structural safety and service life of the tunnel. At the same time, cracks can easily cause water leakage in the tunnel. Second, poor rust resistance. For submarine tunnels, if not properly treated, the high concentration of chloride ions in seawater can corrode the reinforced concrete segments. Third, slurry effect detection. The traditional detection method is pipe segment opening and wall radar scanning, but it can only detect the filling effect of the slurry and cannot monitor the internal mechanical properties and defects of the grouting material in real time. Therefore, it is of great significance to develop a synchronous grouting material with high strength, good crack resistance, and economic and environmental protection. SUMMARY

[0005] To solve the above problems, the present application uses fine sand containing mud obtained after shield tunneling in the Beihai Mud-water Shield Project in Guangxi as the main raw material, and through a large number of experiments, a high-efficiency environmental protection composite admixture is developed. The spoil and the composite admixture can synergistically act with other components in the slurry, and the prepared slurry has high early and late strength and good crack resistance, can endow the grouting material with self-strain sensing capability, and can monitor the stress, strain, cracks, and structural damage inside the grouting material.

[0006] In order to achieve the above purpose, the beneficial effects of the present application are as follows: A novel green synchronous grouting material, by weight fraction, comprises the following components: Cement 5-12 parts Slag 8-20 parts 12-25 parts of steel slag 250-350 parts of fine sand containing mud 0.1-1.0 parts of sodium laurate 0.03-0.2 parts of cellulose fiber 2-10 parts of biomass carbon 0.2-1.5 parts of sodium lauryl sulfate 20-60 parts water.

[0007] In the technical solution of the present invention, the interaction principle between the raw materials is as follows: Sodium laurate reacts with C3S, C2S and free calcium oxide in steel slag, slag and cement to form a new product calcium laurate that covers the surface of the material. Since the reaction product calcium laurate contains a 12-carbon long-chain alkyl group, calcium laurate has a lower surface energy and forms an irregular layered structure. The combination of low surface energy and rough surface structure improves the density and strength of the slurry and has a hydrophobic effect. Figure 1 and Figure 2 As shown in the figure, when 1.2wt% sodium laurate is added to the grouting material, the surface of its particles is smooth, the density is high, and the hydrophobicity is strong; while the surface of the grouting material particles without sodium laurate is loose and has good water absorption; the main chain of the nanocellulose fiber is composed of glucose units connected by β-1,4 glycosidic bonds, and the surface is rich in hydroxyl (-OH) groups; since the main groups of sodium laurate are carboxylate ions and long-chain alkyl groups, the hydroxyl and carboxylate groups can be combined through hydrogen bonds to form physical adsorption; at the same time, the hydrophobic alkyl chains of sodium laurate can interact with the cellulose surface through van der Waals forces; the addition of nanocellulose fibers can effectively increase the viscosity of the cement slurry and improve the Ca content of cement composites. 2+ ion concentration and accelerate the formation of hydrated calcium silicate gel; at the same time, it can transfer water molecules to the interior of unhydrated cement, promoting the formation of a thicker hydration product shell (high-density hydrated calcium silicate) on the surface of cement particles. In addition, nanocellulose fibers act as nanocrystalline cores and nanobridges in the cement-steel slag hydration matrix, and polymerize with sodium laurate to form a network structure, compacting the slurry microstructure and improving the slurry's crack resistance; strengthening the interaction and bonding of the matrix, and improving the interfacial mechanical properties of cement materials, such as Figure 3 As shown in Figure 2, when 0.2 wt% nanocellulose is added to the synchronous grouting, the surface is smooth and dense after solidification, while the surface of the grouting material without nanocellulose is rough and has certain pores after solidification; Figure 4 As shown in the figure, the specimens without cellulose fiber addition exhibited brittle fracture characteristics, with fracture in the middle of the specimen and straight cracks. With the addition of different amounts of cellulose fiber, the toughness of the specimens increased and the cracks became oblique cracks.

[0008] Sodium dodecyl sulfate can be used as a surfactant to effectively disperse biomass carbon. The addition of biomass carbon can promote the hydration activity of steel slag and improve the slurry strength. At the same time, it can be used as a conductive material to give the grouting material self-strain sensing ability, which can monitor the internal stress, strain, cracks and structural damage of the grouting material.

[0009] In some embodiments, 0.01-0.1 parts of KH570 are also included. The addition of coupling agent KH570, the hydrophobic alkyl chain contained in it It can enhance the compatibility with the alkyl chain of sodium laurate. On the other hand, the methacryloyloxy group on the KH570 structure It can temporarily bind to the hydroxyl groups (-OH) on the surface of cellulose fibers through hydrogen bonds, thereby enhancing interfacial wettability. Through chemical bonding, it reduces interfacial defects between cellulose and polymer matrix, enhances interfacial bonding strength, and improves the mechanical properties of the material. It can also reduce the surface polarity of cellulose, improve its dispersibility, and make it easier to disperse.

[0010] In some embodiments, the cement is ordinary Portland cement and / or sulphoaluminate cement.

[0011] In some embodiments, the density of the slag is 2.5-3.0 g / cm 3 , with a specific surface area of ​​370-480m 2 / kg.

[0012] In some embodiments, the steel slag has a fineness of 200-300 mesh and a density of 3.0-3.5 g / cm 3 , the activity value at 28 days is 95%~96%.

[0013] In some embodiments, the particle size of the mud-containing fine sand is ≤20 μm, and the clay content is 15-25%.

[0014] In some embodiments, the mud-containing fine sand is obtained by screening shield slag multiple times; specifically, the process of obtaining the mud-containing fine sand by screening shield slag is as follows: (1) The slurry of the slurry shield is transported from the tunnel to the vibrating screen in the slurry treatment equipment, where it is separated to obtain 3-6 mm sand-containing slurry; (2) Next, the 3-6 mm sand-containing mud enters the first-stage cyclone for separation to obtain sand-containing mud below 74 μm; (3) The sand-containing mud continues to enter the secondary cyclone and is separated to obtain mud-containing fine sand with a particle size of less than 20 μm.

[0015] In some embodiments, the biomass carbon is bagasse biomass carbon.

[0016] In some embodiments, the particle size of the bagasse biomass carbon is 10-30 μm.

[0017] In some embodiments, the preparation of the biomass carbon comprises the following steps: The waste bagasse and alkali are added into water, mixed uniformly, and dried to constant weight to obtain a mixture; then the mixture is calcined at a temperature of 400-800 DEG C under a protective atmosphere, and the obtained product is washed with dilute acid, dried to obtain the biomass carbon.

[0018] In some embodiments, the alkali is at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, and calcium carbonate.

[0019] In some embodiments, the protective atmosphere is one of nitrogen gas atmosphere, argon gas atmosphere, and helium gas atmosphere.

[0020] In some embodiments, the concentration of the dilute acid is 0.5-3 mol / L; and the dilute acid is at least one of dilute hydrochloric acid, dilute sulfuric acid, and dilute nitric acid.

[0021] Further, the method for preparing the bagasse biomass carbon is as follows: (1) The waste bagasse is put into a crushing device to be sheared, crushed, ground, and sieved to obtain granules with a particle size of less than 2.36 mm; (2) The bagasse granules and NaOH are weighed according to a mass ratio of 1:1, added into 2000 ml of water, stirred uniformly by a powerful stirrer, filtered, and dried to constant weight in an oven at 100 DEG C; (3) The dried material in (2) is calcined in a nitrogen high-temperature furnace at 600 DEG C for 1 hour; (4) The calcined powder is soaked in a 1.5 mol / L dilute hydrochloric acid solution for 8-10 hours, and then washed with water for multiple times until the washing liquid is neutral; (5) The product obtained in (4) is dried to constant weight in an oven at 80 DEG C, and then ground to obtain the activated bagasse biomass carbon with a particle size of 10-30 um.

[0022] The application also provides a preparation method of the novel green synchronous grouting material according to any one of the above embodiments, which comprises the following steps: S1, mixing cement, slag, steel slag, and fine sand containing mud, adding part of water, and fully mixing uniformly to obtain a first slurry; S2, dissolving sodium laurate and KH570 in part of water, then adding nano cellulose fibers, and dispersing uniformly to obtain a nano cellulose fiber dispersion liquid; S3, adding the nano cellulose fiber dispersion liquid into the first slurry, fully mixing uniformly, and obtaining a second slurry; S4, dissolve sodium dodecyl sulfonate in the remaining water, then add biomass carbon and disperse uniformly to obtain a biomass carbon dispersion liquid; S5, add the biomass carbon dispersion liquid into the second slurry and mix uniformly to obtain the novel green simultaneous grouting material.

[0023] In some embodiments, the whole slurry preparation process is controlled within 7-10 min.

[0024] Compared with the prior art, the present application has the following advantages: (1) The synchronous grouting material of the present application contains more than 75% of fine sand mixed with mud, which realizes zero addition of fly ash, bentonite and fine sand compared with traditional synchronous grouting materials, reduces the cement dosage by more than 50%, reduces the cost of a large amount of materials, and reduces the transportation and disposal cost of a large amount of slag, thereby achieving significant overall economic benefits. In addition, the present application can turn waste into treasure, reduce environmental pollution caused by slag transportation and discharge, reduce natural sandstone mining, and reduce secondary pollution and carbon emissions.

[0025] (2) The synchronous grouting material prepared by the present application has high early and late strength and good crack resistance due to the specific raw material ratio.

[0026] (3) The synchronous grouting material prepared by the present application has super-hydrophobic function, with a contact angle of 154.2°, which can effectively prevent chloride ion erosion and has strong rust resistance.

[0027] (4) The synchronous grouting material prepared by the present application has piezoelectric function, large resistance change amplitude and strong piezoelectric sensitivity, which can meet the requirements of structural self-safety monitoring, predict internal damage of grouting material, warn potential brittle failure of structure, and improve structural safety and durability.

[0028] (5) The preparation method of the present application has simple process, high production efficiency and small equipment area, which can adapt to narrow urban subway construction site. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 SEM images of synchronous grouting material particles obtained by adding or not adding sodium laurate; wherein, (a) and (b) are SEM images without adding sodium laurate; (c) and (d) are SEM images with 1.2wt% sodium laurate added; Figure 2 Hydrophobicity test diagram of synchronous grouting material after curing by adding or not adding sodium laurate; wherein, (a) is the test diagram without adding sodium laurate; (b) and (c) are side views of adding 1.2wt% sodium laurate; Figure 3SEM images of simultaneous grouting materials with or without nanocellulose; wherein, (a) and (b) are SEM images without nanocellulose; (c) and (d) are SEM images with 0.2wt% nanocellulose; Figure 4 Schematic diagram of fracture of test piece of simultaneous grouting material with different amounts of nanocellulose; Figure 5 Particle size distribution diagram of shield muck used in the examples and comparative examples of the present application; Figure 6 Schematic diagram of resistivity test of simultaneous grouting material test piece in the present application. DETAILED DESCRIPTION

[0030] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways beyond the specific details set forth herein, and similar improvements can be made by those skilled in the art without departing from the spirit and scope of the present application, and therefore the present application is not limited to the specific implementations disclosed below.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] The parameters or preparation methods of part of the raw materials used in the examples and comparative examples of the present application are as follows: Cement: commercially available, PO42.5 ordinary portland cement; Slag: commercially available, density 2.89g / cm 3 , specific surface area 422.3m 2 / kg; Steel slag: commercially available, fineness of steel slag 200~300 mesh, density 3.0~3.5g / cm 3 , 28d activity value 95%~96%; Muck is shield muck, and the particle size distribution is shown in Figure 5 ; Fine sand with mud is obtained by multi-stage screening of shield muck, and the particle size distribution of the shield muck is shown in Figure 5 ; The method for preparing fine sand with mud is as follows: (1) The mud balance shield slurry is transported from the tunnel to the vibrating screen in the mud water treatment equipment, and 3-6mm sand-containing slurry is separated.

[0033] (2) Next, the 3-6mm sand-containing slurry enters the first cyclone to separate the sand-containing slurry below 74μm.

[0034] (3) The sand-containing slurry continues to enter the secondary cyclone, and 20 pm or less fine sand-containing silt is separated.

[0035] The biomass carbon is a sugarcane residue biomass carbon, which is obtained by calcining sugarcane residue at high temperature, and the specific process is as follows: (1) The waste sugarcane residue is put into a crushing device for shearing, crushing, grinding and sieving to obtain granules with a particle size of less than 2.36 mm; (2) The above sugarcane residue granules and NaOH are weighed according to a mass ratio of 1:1, 2000 ml of water is added, and after uniform stirring by a powerful stirrer, it is filtered and placed in a 100℃ oven for drying to constant weight; (3) The dried material in (2) is placed in a 600℃ nitrogen high-temperature furnace for calcination for 1 hour; (4) The calcined powder is soaked in 1.5 mol / L dilute hydrochloric acid solution for 8-10 hours, and then washed with water for multiple times until the washing liquid reaches neutral; (5) The product obtained in (4) is placed in an 80℃ oven for drying to constant weight, and then ground to obtain activated sugarcane residue biomass carbon with a particle size of 10-30 um.

[0036] Sodium laurate, nanocellulose fiber, sodium dodecyl sulfonate, KH570, early strength agent (calcium formate), and accelerating agent (sodium carbonate) are all commercially available.

[0037] Example 1 A new green synchronous grouting material, by weight fraction, includes the following components:

[0038] Cement 8 parts Slag 13 parts Steel slag 19 parts Fine sand-containing silt 275 parts Sodium laurate 0.48 parts Nanocellulose fiber 0.08 parts Water 40 parts The preparation method includes the following steps: (1) Use excavators or forklifts to transport the fine sand-containing silt to the mortar mixer, and transport the cement, slag and steel slag to the mixer through the storage tank, add part of the water and fully stir for 2 min to obtain the slurry; (2) Fully stir sodium laurate and the remaining water for 2 min, then add nanocellulose fiber and fully stir for 2 min to obtain a uniformly dispersed nanocellulose fiber dispersion; (3) Add the dispersion obtained in step (2) to the slurry obtained in step (1) and fully stir for 3 min to obtain the synchronous grouting material.

[0039] Example 2

[0040] A new green synchronous grouting material, by weight parts, comprises the following components: Cement 8 parts Slag 13 parts Steel slag 19 parts Fine sand containing clay 275 parts Sodium laurate 0.48 parts Nanocellulose fiber 0.08 parts Sugarcane residue biomass carbon 4 parts Sodium dodecyl sulfonate 0.6 parts Water 40 parts The preparation method comprises the following steps: (1) Use excavator or forklift to transport fine sand containing clay to mortar mixer, cement, slag and steel slag are transported to the mixer through storage tank, add part of water and fully stir for 2 min, get first slurry; (2) fully stir sodium laurate and part of water for 2 min, then add nanocellulose fiber and fully stir for 2 min, get uniformly dispersed nanocellulose fiber dispersion; (3) add the dispersion obtained in step (2) to the first slurry obtained in step (1), get second slurry; (4) mix sodium dodecyl sulfonate with the remaining water, fully stir for 1 min, then add sugarcane residue biomass carbon and fully stir for 2 min, get uniformly dispersed sugarcane residue biomass carbon dispersion; (5) add the dispersion obtained in step (4) to the second slurry obtained in step (3), fully stir for 3 min, get synchronous grouting material.

[0041] Example 3

[0042] A new green synchronous grouting material, by weight parts, comprises the following components: Cement 8 parts Slag 13 parts Steel slag 19 parts Fine sand containing clay 275 parts Sodium laurate 0.48 parts Nanocellulose fiber 0.08 parts KH570 0.05 parts Sugarcane residue biomass carbon 4 parts Sodium dodecyl sulfonate 0.6 parts Water 40 parts The preparation method comprises the following steps: (1) The excavator or forklift is used to transport the mud-containing fine sand to the mortar mixer, the cement, slag and steel slag are respectively transported to the mixer through the storage tank, a part of water is added and fully stirred for 2 minutes to obtain a first slurry; (2) The sodium laurate, KH570 and part of water are fully stirred for 2 minutes, and then the nanocellulose fiber is added and fully stirred for 2 minutes to obtain a uniformly dispersed nanocellulose fiber dispersion liquid; (3) The dispersion liquid obtained in step (2) is added to the first slurry obtained in step (1) to obtain a second slurry; (4) The sodium dodecyl sulfonate is mixed with the remaining water, fully stirred for 1 minute, and then the bagasse biomass carbon is added and fully stirred for 2 minutes to obtain a uniformly dispersed bagasse biomass carbon dispersion liquid; (5) The dispersion liquid obtained in step (4) is added to the second slurry obtained in step (3) and fully stirred for 3 minutes to obtain a synchronous grouting material.

[0043] The raw material compositions of Examples 1-3 are shown in Table 1.

[0044] Table 1 Raw material compositions (g) of Examples 1-3

[0045] Comparative Example 1 A synchronous grouting material, by weight fraction, comprises the following components: Cement 12 parts Slag 17 parts Steel slag 25 parts Residual soil 285 parts Accelerator 0.8 parts Water 35 parts The preparation method comprises the following steps: (1) The excavator or forklift is used to transport the residual soil to the mortar mixer, the cement, slag and steel slag are respectively transported to the mixer through the storage tank, a part of water is added and fully stirred for 2 minutes to obtain a slurry; (2) The accelerator and the remaining water are fully stirred for 2 minutes to obtain a uniformly dispersed accelerator solution; (3) The accelerator solution in step (2) is added to the slurry in step (1) and fully stirred for 3 minutes to obtain a synchronous grouting material.

[0046] Comparative Example 2 A synchronous grouting material, by weight fraction, comprises the following components: Cement 12 parts Slag 17 parts Steel slag 25 parts Residual soil 285 parts accelerating agent 0.8 parts early strength agent 1.25 parts water 35 parts; The preparation method comprises the following steps: (1) The excavator or forklift is used to transport the slag to the mortar mixer, the cement, slag and steel slag are respectively transported to the mixer through the storage tank, part of the water is added and fully stirred for 2 minutes to obtain a first slurry; (2) The early strength agent is fully stirred with part of the water for 2 minutes to obtain a uniformly dispersed early strength agent solution; (3) The early strength agent solution in step (2) is added to the slurry in step (1), and fully stirred for 1 minute to obtain a second slurry; (4) The accelerating agent is mixed with the remaining water and fully stirred for 2 minutes to obtain a uniformly dispersed accelerating agent solution; (5) The early strength agent solution in step (4) is added to the second slurry in step (3), and fully stirred for 3 minutes to obtain a synchronous grouting material.

[0047] Comparative Example 3 A synchronous grouting material comprises the following components in parts by weight: cement 12 parts slag 17 parts steel slag 25 parts slag 285 parts water 35 parts; The preparation method comprises the following steps: (1) The excavator or forklift is used to transport the slag to the mortar mixer, the cement, slag and steel slag are respectively transported to the mixer through the storage tank, part of the water is added and fully stirred for 2 minutes to obtain a first slurry;

[0048] The raw material compositions of Comparative Examples 1-3 are shown in Table 2.

[0049] Table 2 Raw material compositions of Comparative Examples 1-3 (g)

[0050] The synchronous grouting materials obtained in Examples 1-3 and Comparative Examples 1-3 are subjected to relevant performance tests, wherein the standards or test methods referred to in each test are as follows: The determination method of impermeable pressure and impermeable grade refers to the relevant provisions of "Standard Test Methods for Basic Properties of Building Mortar" (JGT / T70-2009) and "Ready-mixed Mortar" (GB / T 25181-2019); The test method of flexural strength refers to GBT 17671-2021 "Cement Mortar Strength Test Method (ISO Method)"; The compressive strength test method refers to the provision of the unconfined compressive strength test in the current industry standard "Cement Soil Mix Proportion Design Regulation" JGJ / T233-2011. The piezoelectric test method is specifically as follows: as shown in Figure 6 Figure, a prism test piece is prepared, two copper mesh sheets are pre-buried at two ends of the test piece as electrodes, and an electric resistance strain gauge is pasted along the loading direction of the test piece; the two electrodes of the test piece are connected to a digital bridge, and the resistance value of the test piece is collected; the strain gauge is connected to a static strain tester, and the strain value of the test piece is collected; by applying a load to the test piece, the strain and resistance change inside the test piece can be continuously measured, and thus a resistance-strain graph of the test piece can be drawn. The resistance-strain graph obtained in the laboratory is a reference standard, which can provide a calculation basis for the resistance value measured in actual engineering. The size of the test piece is 40mmx40mmx160mm; The size of the copper wire mesh is 40mmx40mmx80mm; The distance between the copper wire meshes is 100mm; The strain gauge parameters are: base size 35mmx5mm, and grid wire size 30mmx3mm.

[0051] The test results are shown in Table 3.

[0052] Table 3 Performance test results of the simultaneous grouting materials obtained in the examples and the comparative examples

[0053] The technical features of the above-described examples can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described examples are not described, however, as long as the combinations of the technical features do not contradict each other, they should be considered as within the scope of the present disclosure.

[0054] The above-described examples only express several embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present patent should be subject to the appended claims.

Claims

1. A new type of green synchronous grouting material, characterized in that: Calculated by weight, it includes the following components: 5-12 parts cement 8-20 parts slag 12-25 parts of steel slag 250-350 parts of fine sand containing mud 0.1-1.0 parts of sodium laurate 0.03-0.2 parts of cellulose fiber 2-10 parts of biomass carbon 0.2-1.5 parts of sodium lauryl sulfate 20-60 parts water.

2. The new green synchronous grouting material according to claim 1, characterized in that: Also included is 0.01-0.1 parts of KH570.

3. The novel green synchronous grouting material according to any one of claims 1-2, characterized in that: The cement is ordinary Portland cement and / or sulphoaluminate cement.

4. The novel green synchronous grouting material according to any one of claims 1-2, characterized in that: The density of the slag is 2.5-3.0 g / cm 3 , with a specific surface area of ​​370-480m 2 / kg.

5. The novel green synchronous grouting material according to any one of claims 1-2, characterized in that: The steel slag has a fineness of 200-300 mesh and a density of 3.0-3.5 g / cm 3 , the activity value at 28 days is 95%~96%.

6. The novel green synchronous grouting material according to any one of claims 1-2, characterized in that: The particle size of the mud-containing fine sand is ≤20 μm, and the clay content is 15-25%.

7. The new green synchronous grouting material according to claim 1, characterized in that: The biomass carbon is bagasse biomass carbon, and the particle size of the biomass carbon is 10-30 μm.

8. The novel green synchronous grouting material according to claim 7, characterized in that: The preparation of the biomass carbon comprises the following steps: Add waste sugarcane bagasse and alkali into water, mix well and dry to constant weight to obtain a mixture; then place the mixture under a protective atmosphere, calcine at a temperature of 400-800° C., wash the obtained product with dilute acid, and dry to obtain the biomass carbon.

9. The method for preparing the novel green synchronous grouting material according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Mix cement, slag, steel slag and fine sand containing mud powder, add part of water, and mix thoroughly to obtain a first slurry; S2, dissolving sodium laurate and KH570 in part of water, then adding nanocellulose fibers and dispersing them evenly to obtain a nanocellulose fiber dispersion; S3, adding the nanocellulose fiber dispersion to the first slurry and mixing thoroughly to obtain a second slurry; S4. Dissolve sodium dodecyl sulfate in the remaining water, add biomass carbon, and disperse evenly to obtain a biomass carbon dispersion; S5. Add the biomass carbon dispersion into the second slurry and mix them thoroughly to obtain the novel green synchronous grouting material.

10. The method for preparing the new green synchronous grouting material according to claim 9, characterized in that: The entire pulping process is controlled within 7-10 minutes.

Images