CN113336483A - High-pressure jet grouting pile repairing particle material and preparation method and application thereof - Google Patents
High-pressure jet grouting pile repairing particle material and preparation method and application thereof Download PDFInfo
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- CN113336483A CN113336483A CN202110554238.9A CN202110554238A CN113336483A CN 113336483 A CN113336483 A CN 113336483A CN 202110554238 A CN202110554238 A CN 202110554238A CN 113336483 A CN113336483 A CN 113336483A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention relates to a high-pressure jet grouting pile repairing particle material and a preparation method and application thereof. The hydrogel particles are prepared from raw materials including initial reaction liquid, monomers, an initiator and a catalyst, wherein the initial reaction liquid includes phosphate buffer solution and titanium dioxide dispersion liquid. The composite high-strength hydrogel is used as a carrier, has the characteristic of high tensile strength, is loaded with phosphate to prepare the repairing particles, can prevent the carrier from being damaged after high-pressure torrent spraying, and effectively protects the internal repairing agent. And adding the reinforcing particles into the slurry of the high-pressure jet grouting pile, and filling the cracks by using hydroxyapatite generated by phosphate and calcium ions in the cracks in situ, thereby improving the foundation reinforcing effect of the high-pressure jet grouting pile.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a high-pressure jet grouting pile repairing particle material and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The high-pressure jet grouting pile construction technology is firstly proposed in Japan in the 70 s, and China begins to develop and apply comprehensively in the 80 s, so that the high-pressure jet grouting pile construction technology becomes a common foundation treatment technology. A high-pressure rotary jet pile is made up through drilling the grout pipe with nozzle into the predefined position of soil layer, jetting out the grout in high-pressure flow mode from nozzle to impact soil body for breaking soil layer, dispersing soil layer in granular state, mixing with grout, and solidifying. The high-pressure jet grouting pile is widely applied to soil layers such as silt, mucky soil, cohesive soil, silty clay and the like, and belongs to cement-based materials. However, under the action of environmental erosion, external load and non-load deformation, cracks are easily formed inside, so that the strength and durability are reduced, and the foundation reinforcement effect is influenced. For a long time, research on high-pressure jet grouting piles focuses on improvement of construction machinery and opposite piles, and research on slurry materials of the high-pressure jet grouting piles is relatively lacked, because after high-pressure jet stirring, a carrier of a repair material is easily damaged, so that the repair material is released or damaged in advance, and the repair effect is greatly reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a high-pressure jet grouting pile repairing particle material and a preparation method and application thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a particulate material for repairing a high-pressure jet grouting pile is a hydrogel particulate, raw materials include initial reaction liquid, a monomer, a catalyst and an initiator, and the initial reaction liquid includes phosphate buffer solution and titanium dioxide dispersion liquid.
The repairing particle material solves the problem that the traditional repairing material cannot be applied to a high-pressure jet grouting pile, and achieves the purpose of improving the reinforcing effect of the high-pressure jet grouting pile.
In a second aspect, the preparation method of the particulate material for repairing the high-pressure jet grouting pile comprises the following specific steps:
preparing titanium dioxide sol and ultrapure water into titanium dioxide dispersion liquid with a certain concentration;
mixing a phosphate buffer solution and a titanium dioxide dispersion solution to obtain an initial reaction solution;
and adding a monomer, a catalyst and an initiator into the initial reaction solution in proportion to obtain the repair particle material.
In a third aspect, the use of the above-described repair particulate material in a high-pressure jet grouting pile slurry.
Fourthly, slurry of the high-pressure jet grouting pile comprises the repairing particle material and cement paste, wherein the repairing particle material accounts for 1-5% of the cement content; preferably 1.5 to 3%.
The invention provides a high-pressure jet grouting pile repairing particle, which adopts high-strength hydrogel as a carrier, has the characteristic of high tensile strength, is prepared by loading phosphate, can prevent the carrier from being damaged after high-pressure shock jet, and effectively protects an internal repairing agent. And adding the reinforcing particles into the slurry of the high-pressure jet grouting pile, and filling the cracks by using hydroxyapatite generated by phosphate and calcium ions in the cracks in situ, thereby improving the foundation reinforcing effect of the high-pressure jet grouting pile. The repair particles prepared by the method have low cost and simple manufacturing process, can be produced in batches, can be directly applied to high-pressure jet grouting pile slurry materials, and do not need post-treatment.
The invention has the beneficial effects that:
firstly, the phosphate-loaded high-strength composite hydrogel particles have the characteristic of high strength, can be kept undamaged in a high-pressure environment, effectively protect an internal repairing agent, and can be used for repairing cracks of a high-pressure jet grouting pile; in addition, the coating has moisture-sensitive property, and can release the repairing agent when meeting water when the external environment changes. The method has simple manufacturing process and can be produced in batches, and can be directly applied to the slurry material of the high-pressure jet grouting pile without post-treatment.
And secondly, after the repairing agent is released, the repairing agent can react with calcium ions in the pore solution to generate precipitates and can fill cracks generated by the high-pressure jet grouting pile body in the external environment, so that the reinforcing effect of the high-pressure jet grouting technology and the durability of the high-pressure jet grouting pile are improved.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a tensile test of hydrogel with different monomer ratios, FIG. 1a is a tensile stress-strain curve diagram, and FIG. 1b is a real diagram of high-strength composite hydrogel during the stretching process;
FIG. 2 is a compression test of hydrogel with different monomer ratios, FIG. 2a is a compressive strain-stress curve, and FIG. 2b is a shape change graph of high-strength composite hydrogel (T15AD10 and T15AD20) before and after compression;
FIG. 3 is a diagram showing the effect of repairing cracks, FIG. 3a is a partial enlarged view before repairing, and FIG. 3b is a partial enlarged view after repairing;
fig. 4 is a graph of mechanical properties of a high strength hydrogel and an MBA crosslinked gel, fig. 4a is a graph of tensile mechanical properties, and fig. 4b is a graph of compressive mechanical properties.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In a first aspect, a particulate material for repairing a high-pressure jet grouting pile is a hydrogel particulate, and comprises raw materials including initial reaction liquid, a monomer and an initiator, wherein the initial reaction liquid comprises a phosphate buffer solution and a titanium dioxide dispersion liquid, and the titanium dioxide dispersion liquid is obtained by matching titanium dioxide sol and water.
The high-pressure jet stirring method is to cut soil body with high-pressure jet flow, stir and mix the soil body and curing agent in situ to form a cylinder, namely the jet grouting pile. The existing repairing material is mixed with cement and then sprayed, a large high-pressure environment needs to be borne, slurry impacts a soil body, and violent interaction is generated between the slurry and the soil body, so that the traditional repairing material is extremely easy to damage, the repairing material is released or damaged in advance, and the repairing effect is reduced.
The solvent of the titanium dioxide dispersion liquid is water, the solute is nano titanium dioxide, and the titanium dioxide sol is sol formed by titanium dioxide and water and is matched with the water to form the titanium dioxide dispersion liquid.
The invention designs a repairing particle which is a high-strength composite hydrogel particle, and the hydrogel has better tensile deformation resistance and compression deformation resistance. After high-pressure spraying, the active ingredient (phosphate) is prevented from being released and damaged in advance, and after the slurry is made into a cylinder, the slurry has better repairing performance, and can be repaired within a certain time after cracks are generated, namely after the repairing particulate material is stirred by high-pressure spraying, the repairing material is not damaged.
In some embodiments of the present invention, the monomers are Acrylic Acid (AA) and N-Dimethylacrylamide (DMAA), and the initial reaction solution corresponds to Acrylic Acid (AA) in a molar percentage of 10% to 40%, preferably 20%, of all monomers. The amount of AA in the total monomers of the present invention determines the resistance of the resulting hydrogel to deformation.
In some embodiments of the invention, the solutes in the phosphate buffer solution are sodium dihydrogen phosphate and disodium hydrogen phosphate, the mass ratio of the sodium dihydrogen phosphate to the disodium hydrogen phosphate being 1:1 to 1.2; preferably, the mass ratio is 1: 1. According to the invention, the phosphate buffer solution is used as a carrier solution of hydrogel, the phosphate is used as a component with a repairing function in the repairing particles, and the phosphate and calcium ions in the cracks generate hydroxyapatite in situ to fill the cracks and improve the reinforcing effect.
In some embodiments of the invention, the phosphate buffer solution has a pH of 6 to 8; preferably, the pH is 7. The phosphate buffer solution in the invention keeps the pH neutral because the mechanical properties of the gel are prevented from being damaged in an acidic or alkaline environment.
In some embodiments of the invention, the mass concentration of titanium dioxide in the hydrogel is 10-30%; preferably 10-20%; more preferably 13%.
According to the invention, titanium dioxide is selected as a cross-linking agent to prepare the high-strength nano composite hydrogel as a carrier of a repair material, and because the surface of the titanium dioxide nano particle is rich in hydroxyl, the titanium dioxide nano particle can form an effective complexing effect with molecules containing carboxyl through ester bonds, single hydrogen bonds or double-tooth chelation, so that the titanium dioxide nano particle has excellent tensile and compressive properties; meanwhile, the titanium dioxide sol has stronger dispersibility, and the sulfate buffer solution and the polymerized substances are fully and uniformly dispersed by using the titanium dioxide sol. Meanwhile, the titanium dioxide sol has excellent stability, phosphate is prevented from being released in advance when the titanium dioxide sol is subjected to a high-pressure environment, loss of the phosphate is avoided, water molecules enter the repair particles in the water environment after cracks are generated, swelling is achieved, the inner pore diameter is enlarged, and the released phosphate reacts with calcium ions in the pore solution to generate hydroxyapatite.
In some embodiments of the invention, the titanium dioxide has a particle size of 15 to 20 nm.
In some embodiments of the invention, the volume ratio of the phosphate buffer solution to the titanium dioxide dispersion is 1:1 to 1.2; preferably 1:1, to prepare the initial reaction solution. The phosphate buffer solution and the titanium dioxide dispersion have better compatibility and better matching performance in the range.
In some embodiments of the present invention, the titanium dioxide dispersion has a titanium dioxide concentration of 10% to 40% by mass, preferably 14% to 16% by mass.
In some embodiments of the invention, the initiator is potassium persulfate (KPS), and the volume ratio of the initiator to the hydrogel is 0.5 to 1.5 ‰; preferably 1% o.
In some embodiments of the invention, the catalyst is Tetramethylethylenediamine (TEMED), and the volume ratio of the catalyst to the hydrogel is 0.5 to 1.5 ‰; preferably 0.8 per thousand.
The monomer and the cross-linking agent have the effects that the monomer is subjected to in-situ free radical polymerization under the action of the cross-linking agent to form the high-strength nano composite hydrogel, so that the influence on the formed hydrogel caused by a large-strength acting force generated in a high-pressure environment is avoided.
In a second aspect, the preparation method of the particulate material for repairing the high-pressure jet grouting pile comprises the following specific steps:
preparing titanium dioxide sol and ultrapure water into titanium dioxide dispersion liquid with a certain concentration;
mixing a phosphate buffer solution and a titanium dioxide dispersion solution to obtain an initial reaction solution;
and adding a monomer into the initial reaction solution, and then adding a catalyst and an initiator to obtain the repair particle material.
In some embodiments of the invention, the initial reaction mixture is mixed with the monomer and inert gas is introduced into the mixture, followed by the addition of initiator and catalyst. The inert gas is added to remove dissolved oxygen, so that the initial reaction liquid is used as an emulsifier to be mixed with the monomer, the catalyst and the initiator to form the repair particles.
In some embodiments of the invention, the reaction is carried out under sealed conditions after the initiator is added; preferably, the reaction temperature under the sealing condition is 20-70 ℃, and the reaction time is 20-24 h; the preferred reaction temperature is 20 ℃ and the reaction time is 24 h.
In a third aspect, the use of the above-described repair particulate material in a high-pressure jet grouting pile slurry.
When the pile body cracks under the action of the external environment, water molecules enter the cracks and stimulate the gel carrier to release the reinforcing agent phosphate, and the repairing agent reacts with calcium ions in the pore solution to generate precipitates to fill the cracks, so that the reinforcing effect is achieved.
In a fourth aspect, the slurry of the high-pressure jet grouting pile comprises the repairing particle material and cement slurry, wherein the cement slurry comprises cement and water, and the repairing particle material accounts for 1-5% of the cement content; preferably 1.5 to 3 percent; further preferably 2 to 2.5%. The above is the percentage of the mass of the particulate repair material cement (excluding water).
In some embodiments of the invention, the cement slurry has a water-cement ratio of 1:0.8 to 1.2. The cement is portland cement or cement with other substances such as fly ash, slag, volcanic ash and the like, limestone, bauxite and the like. The invention will be further illustrated by the following examples
Example 1
The preparation method of the high-pressure jet grouting pile repairing particles comprises the following specific steps:
1) preparing phosphate buffer solution, respectively dissolving 35.5g of disodium hydrogen phosphate and 30g of sodium dihydrogen phosphate in distilled water, respectively transferring to a 250ml volumetric flask, and respectively metering the volume to obtain 1mol/L disodium hydrogen phosphate solution and 1mol/L sodium dihydrogen phosphate solution; then 57.5ml of sodium dihydrogen phosphate solution and 42.5ml of disodium hydrogen phosphate solution are respectively and uniformly mixed to prepare phosphate buffer solution with pH 7.
2) The titania sol was mixed with ultrapure water to give 100ml of a 15% titania dispersion, and nitrogen was bubbled for 30min to remove oxygen dissolved in the water.
3) Mixing the phosphate buffer solution with the titanium dioxide dispersion liquid, wherein the volume ratio of the phosphate buffer solution to the titanium dioxide dispersion liquid is 1; 1, preparing an initial reaction solution.
4) Adding 0.07g of Acrylic Acid (AA) into 20ml of initial reaction liquid, adding 0.9g of N-N-Dimethylacrylamide (DMAA), covering with tinfoil and keeping out of the sun, continuously stirring for 15min under the bubbling of nitrogen, then transferring the reaction liquid into an ice-water bath, cooling to 0 ℃, adding 8 mu l of Tetramethylethylenediamine (TEMED) and 0.5ml of 2% potassium persulfate (KPS), stirring uniformly, transferring into glass molds of different shapes, sealing, placing in a thermostat at 20 ℃ for in-situ free radical polymerization for 24h, taking out the gel after the polymerization is finished, and cleaning the surface of the gel with water to prepare the phosphate-loaded high-strength composite hydrogel particles. The dried material was then wiped dry with moistened filter paper, weighed and then sealed for refrigeration for subsequent testing.
Example 2
Phosphate-loaded high-strength composite hydrogel microparticle Strength test obtained in example 1
The phosphate-loaded high-strength composite hydrogel microparticles synthesized above were subjected to tensile and compressive property tests at room temperature (25 ℃). The testing instrument is an AGS-J type electronic universal material testing machine. The specific experimental parameters were as follows:
a tensile test is carried out, the diameter of a sample is 6.3mm, the length of the sample is 40mm, the distance between clamps is 20mm, the tensile speed is 20mm/min, and the tensile strength is defined as the stress value of a unit area when the hydrogel is broken; compression test, the sample is a 10mm cube, the compression rate is 5mm/min, and the compressive strength is defined as the stress per unit area at which the hydrogel breaks or compresses to 95%.
The hydrogel in the lower graph was named TmADn depending on the concentration of titanium dioxide and the monomer ratio in the initial reaction solution, wherein m represents the concentration of titanium dioxide and n represents the ratio of AA in the total monomer content. For example, T15AD10 indicates that the titanium dioxide dispersion has a titanium dioxide mass concentration of 15%, AA accounts for 10 mol% of all monomers, and so on.
FIG. 1a shows the tensile properties of hydrogels in different ratios. As can be seen from the figure, as the proportion of AA in the total monomer content increases, the elastic modulus of the resulting hydrogel increases, but the elongation at break decreases, the gel toughness decreases, and the brittleness increases, indicating that as the proportion of acrylic acid increases, the crosslinking density of the hydrogel increases, the length of the polymer chain between crosslinking points decreases, thereby resulting in a decrease in the tensile properties of the hydrogel. When the proportion of AA in the total monomer content exceeds 40%, the resulting hydrogel is hard and brittle, and when it is fixed to a jig, it is broken, and a tensile test cannot be conducted. Considering the effect of elongation at break and elastic modulus on the final tensile strength together, the hydrogel of T15AD20 had a maximum tensile strength of 182.9kpa, corresponding to elongation at break and elastic modulus of 585.9% and 52.62kpa, respectively.
FIG. 2 shows the compressive properties of hydrogels of different ratios. As shown in FIG. 2(a), T15AD10 has a low proportion of T15AD20 spear AA, has a low crosslinking density, and thus has excellent elastic properties without being damaged even when compressed by 95%, compressive strengths of 4.3MPa and 9.1MPa, respectively, and shows a strong strength, and at the same time, the gel can be restored to the original height after the external force is removed, as shown in FIG. 2 (b). As the AA ratio increases, the elasticity of the hydrogel decreases and the gel cracks during compression, resulting in a decrease in compressive strength, such as T15AD30 to 7.1MPa due to the occurrence of compression cracks. For T15AD40, the gel became very brittle with 75% compression, i.e., complete fracture, and a compressive strength of only 2.3MPa, due to a further increase in crosslink density. As in the tensile test, when the AA ratio exceeds 40%, the gel compression property is poor, and the hydrogel is crushed with a slight compression set, so that the T15AD20 ratio hydrogel is preferable.
Example 3
The application of the phosphate-loaded high-strength composite hydrogel particles obtained in example 1 in filling cracks of cement-based materials is as follows: according to the water-cement ratio of 1: 1.2, mixing and stirring water and P.O42.5 ordinary Portland cement in a cement paste stirrer, and adding gel particles with the mass being 2.5 percent of that of the ordinary Portland cement in the stirring process; and then preparing the cement paste containing the gel particles into a cylindrical test block with the diameter of 100mm multiplied by 50mm, curing for 24h in a room with the temperature of 20 ℃ and the relative humidity of 45%, then removing the mold, and curing in a curing room with the temperature of 20 ℃ and the relative humidity of 90% to obtain the phosphate-loaded high-strength composite hydrogel particles.
The repairing performance of the repairing particles for the cracks is tested as follows:
after the cylindrical sample is wound by using a transparent adhesive tape for five circles along the side surface and fixed, the cylindrical sample is erected and placed on a compression resistant machine, the compression resistant machine is started at the speed of 0.1KN/s, when the sample has cracks, the operation of the compression resistant machine is stopped immediately, and the width of the cracks is recorded by a scanner and is about 50-400 mu m. Then, the test piece is placed in a standard curing room for curing, and after 14d, a crack picture is obtained by scanning with a scanner, and the result is shown in fig. 3: fig. 3a is a partially enlarged view before reinforcement, and fig. 3b is a partially enlarged view after reinforcement. As can be seen from FIG. 3, after the pile body is reinforced for 14d, the cracks in the pile body are basically filled and repaired by the generated precipitates, and the average width of the filled cracks is about 300 μm, which shows that the invention can effectively repair the cracks.
Example 4
The difference from example 3 is: the repairing particles account for 2 percent of the mass of the cement. Experiments are carried out through a compression machine, after the pile body is reinforced for 14d, the cracks in the pile body are basically filled and repaired by generated precipitates, the average width of the filled cracks is about 280 mu m, which is only slightly lower than that of the embodiment 3, and the invention can effectively repair the cracks.
Example 5
The phosphate-loaded high-strength composite hydrogel microparticles synthesized above were subjected to tensile and compressive property tests at room temperature (20 ℃). The test instrument is a CMT4102 universal tester. The control group was prepared from conventionally prepared PAM hydrogel with MBA as the cross-linker. The specific experimental parameters were as follows:
a tensile test, wherein the diameter of a sample is 5mm, the length of the sample is 30mm, the tensile speed is 20mm/min, and the tensile strength is defined as the stress value of a unit area when the hydrogel breaks; compression test, the sample is a 10mm cube, the compression rate is 5mm/min, and the compression strength is defined as the stress per unit area at which the hydrogel breaks or deforms to 80%.
FIG. 4a shows the tensile properties of two hydrogels. As can be seen from the figure, the MBA crosslinked hydrogel had a tensile strength of about 0.117MPa and a tensile set of 2000%. The tensile property of the high-strength hydrogel is obviously improved, the tensile strength is close to 0.25MPa, and the tensile deformation is 2800 percent (improved by 40 percent). FIG. 4b shows the compressive properties of two hydrogels, which based on MBA crosslinking have a compressive strength of about 1.2MPa and do not recover to the original shape after compression. The strength of the high-strength hydrogel is obviously improved and is close to 2MPa, and the hydrogel is not damaged by naked eyes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a high pressure jet grouting pile restores particulate material which characterized in that: the hydrogel particles are prepared from raw materials including initial reaction liquid, monomers, a cross-linking agent and an initiator, wherein the initial reaction liquid includes phosphate buffer solution and titanium dioxide dispersion liquid, and the titanium dioxide dispersion liquid is prepared by matching titanium dioxide sol and water.
2. The high pressure jet grouting pile repair particulate material of claim 1, wherein: the monomers are acrylic acid and N-N dimethylacrylamide, and the initial reaction liquid corresponds to acrylic acid accounting for 10-40% of the mole percentage of all the monomers, and the initial reaction liquid is preferably 20%.
3. The high pressure jet grouting pile repair particulate material of claim 1, wherein: solutes in the phosphate buffer solution are sodium dihydrogen phosphate and disodium hydrogen phosphate, and the mole percentage of the sodium dihydrogen phosphate and the disodium hydrogen phosphate is 1-2:1: 2; preferably, the mole percentage is 1: 1.
4. The high pressure jet grouting pile repair particulate material of claim 1, wherein: the pH value of the phosphate buffer solution is 6-8; preferably, the pH is 7.
5. The high pressure jet grouting pile repair particulate material of claim 1, wherein: the mass concentration of titanium dioxide in the hydrogel is 10-30%; preferably 10-20%; more preferably 13%;
or the mass concentration of the titanium dioxide in the titanium dioxide dispersion liquid is 10-40%; preferably 10-20%; more preferably 14-16%;
or the particle size of the titanium dioxide is 15-20 nm.
6. The high pressure jet grouting pile repair particulate material of claim 1, wherein: the volume ratio of the phosphate buffer solution to the titanium dioxide dispersion liquid is 1: 1-1.2; preferably 1:1, to prepare the initial reaction solution.
7. The high pressure jet grouting pile repair particulate material of claim 1, wherein: the initiator is potassium persulfate, and the volume ratio of the initiator to the hydrogel is 0.5-1.5 per thousand; preferably 1 per mill;
or the catalyst is tetramethyl ethylenediamine, and the volume ratio of the catalyst to the hydrogel is 0.5-1.5 per mill; preferably 0.8 per thousand.
8. The method for preparing the high-pressure jet grouting pile repairing particle material as claimed in any one of claims 1 to 7, wherein: the method comprises the following specific steps:
mixing a phosphate buffer solution and a titanium dioxide dispersion solution to obtain an initial reaction solution;
adding monomers into the initial reaction liquid in proportion, and then adding an initiator to obtain a repair particle material;
preferably, after the initial reaction liquid and the monomer are mixed, inert gas is introduced into the mixed liquid, and then the initiator and the catalyst are added;
preferably, after adding the initiator and the catalyst, the reaction is carried out under the sealing condition; preferably, the reaction temperature under the sealing condition is 20-70 ℃, and the reaction time is 20-24 h; the preferred reaction temperature is 20 ℃ and the reaction time is 24 h.
9. Use of a high pressure jet grouting pile repair particulate material as claimed in any one of claims 1 to 7 in a high pressure jet grouting pile slurry.
10. The slurry of the high-pressure jet grouting pile is characterized in that: the cement paste comprises cement and water, and the content of the repairing particle material is 1-5% of the cement content.
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| CN115030132A (en) * | 2022-04-15 | 2022-09-09 | 北京工业大学 | Low-carbon all-weather rock-soil stabilization method based on ultralow swelling hydrogel |
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