CN115385596A - Bleeding-proof grouting material for splitting compaction grouting and preparation method thereof - Google Patents
Bleeding-proof grouting material for splitting compaction grouting and preparation method thereof Download PDFInfo
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention belongs to the technical field of grouting reinforcement materials for underground engineering, and relates to a bleeding-proof grouting material for splitting compaction grouting and a preparation method thereof. The paint comprises the following components in parts by weight: 500 parts of Portland cement, 300-1000 parts of water, 1-20 parts of polycarboxylic acid water reducing agent, 1-50 parts of fumed silica and 1-30 parts of anti-bleeding polymer. The bleeding-proof grouting material for the splitting compaction grouting provided by the invention has the performances of low percolation property, low bleeding rate, high slurry condensation strength and the like, and is beneficial to realizing the splitting compaction grouting reinforcement effect.
Description
Technical Field
The invention belongs to the technical field of grouting reinforcement materials for underground engineering, and relates to a bleeding-proof grouting material for splitting compaction grouting and a preparation method thereof.
Background
The information disclosed 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.
In the process of underground engineering construction, water-rich soft geology is often crossed, water bursting and mud bursting disasters are easy to happen, and underground engineering construction is seriously threatened. The grouting is used as an effective means for reinforcing weak stratum and widely applied to the geological treatment of rich water and weak penetration of the tunnel, and a large number of grouting engineering practices show that the split-compaction grouting mode is an effective reinforcing mode. The splitting-compacting grouting diffusion process of the weak stratum is a process of coupling a slurry flow field and a stress field of the weak stratum. After the grouting is finished, a complex body consisting of the slurry vein framework and the compacted layer is formed, and the overall performance of the stratum is improved under the synergistic action of the slurry vein framework support and the compaction and consolidation of the weak stratum.
According to the research of the inventor, the five-stage evolution mode of the fracturing, compaction and grouting of the water-rich weak stratum is as follows: the method comprises the steps of low-pressure permeation → reaming compaction → splitting initiation → splitting flow → passive soil pressure, wherein in the whole process, water among soil particles in a soil body is extruded by injected grout, seepage occurs to a place with small ground stress, compression deformation occurs to a weak soil body, in the process that the grout extrudes the soil body, the soil body also exerts reaction force on the grout, the water in the grout is subjected to the counter-pressure effect of a stratum, water is filtered away, incomplete hydration of cement is easily caused, and the strength and impermeability of a cement-based grouting material cannot meet the design requirements easily.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the bleeding-preventing grouting material for the splitting compaction grouting and the preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in one aspect, the application of the bleeding-proof polymer in the splitting compaction grouting comprises the following preparation processes: carrying out a polymer reaction on acrylic acid, acrylamide, an initiator and a crosslinking agent in water according to a mass ratio of 100-40.
On the other hand, the bleeding-preventing grouting material for fracturing compaction grouting comprises the following components in parts by weight: 500 parts of Portland cement, 300-1000 parts of water, 1-20 parts of polycarboxylic acid water reducing agent, 1-50 parts of fumed silica and 1-30 parts of anti-bleeding polymer; wherein the anti-bleeding polymer is the anti-bleeding polymer applied to the above.
In a third aspect, a preparation method of the bleeding-proof grouting material for splitting compaction grouting comprises the following steps:
mixing the anti-bleeding polymer with water to make the anti-bleeding polymer pre-absorb water to saturation;
adding portland cement, a polycarboxylic acid water reducing agent, a pre-water-saturation anti-bleeding polymer and fumed silica into water, and uniformly mixing and stirring to obtain the water-based anti-bleeding agent.
In a fourth aspect, the bleeding-preventing grouting material for the splitting compaction grouting is applied to grouting reinforcement by a splitting compaction grouting method.
The invention has the beneficial effects that:
firstly, the bleeding-preventing polymer provided by the invention is applied to the splitting compaction grouting, and the bleeding-preventing polymer is added into the splitting compaction grouting material, so that the problem that the splitting compaction grouting material can effectively reduce the bleeding rate can be effectively solved, and the volume retraction phenomenon caused by the bleeding problem in the hydration reaction process can be avoided. Secondly, the bleeding-preventing grouting material for splitting compaction grouting provided by the invention can solve the problem of incomplete cement hydration reaction caused by water filtered away due to compaction percolation effect, and the bleeding-preventing polymer with pre-retained water not only can slowly release water to ensure the humidity environment of the cement-based material in the hydration process, but also can increase the liquid viscosity and greatly reduce the water filtration amount of the compaction percolation effect, thereby improving the generation amount of C-S-H, and improving the pulp vein strength and the grouting reinforcement effect.
Drawings
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 exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a microscopic electron microscope scanning image of a stone body of the special grouting material for splitting compaction grouting in embodiment 1 of the invention;
figure 2 shows the water drainage of ordinary cement-based materials with and without anti-bleeding polymers.
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 exemplary embodiments according to the invention. 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.
The invention provides a bleeding-proof grouting material for splitting compaction grouting and a preparation method thereof, aiming at the problem that the strength and the impermeability of a cement-based grouting material cannot meet the design requirements due to incomplete cement hydration caused by water seepage caused by the compaction percolation effect in the splitting compaction grouting of a water-rich weak stratum.
In a typical embodiment of the present invention, there is provided an application of a bleeding-preventing polymer in a split compaction grouting, wherein the bleeding-preventing polymer is prepared by the following steps: carrying out a polymer reaction on acrylic acid, acrylamide, an initiator and a crosslinking agent in water according to a mass ratio of 100-40.
The anti-bleeding polymer is recorded in ZL202010794909.4 'an anti-bleeding polymer and low retraction solid waste filling material and a preparation method and application'. The preparation process comprises the following steps: 1) Preparing an acrylic acid solution, and adding acrylamide into the acrylic acid solution to prepare a hydrophilic monomer solution; 2) Adding a cross-linking agent into the hydrophilic monomer solution, mixing and dissolving, then adding an initiator into the hydrophilic monomer solution, and heating and polymerizing to form polymer gel; 3) Mincing the polymer gel into particles, and adding a sodium hydroxide solution into the particles to perform a neutralization reaction; 4) Drying the neutralized gel particles, further crushing and screening to obtain primary anti-bleeding polymer particles; 5) And spraying the surface cross-linking agent solution on the surfaces of the primary anti-bleeding polymer particles, and drying to obtain the anti-bleeding polymer.
Through research, the key problem that the strength of grout veins formed after splitting, compaction, grouting and reinforcement of poor rock-soil bodies is not high enough is that the seepage and bleeding phenomena of grouting materials are serious in the compaction process. The cement grouting material belongs to suspension and consists of water and a large number of solid small particles, and when the cement-based slurry is static, the particles are settled and water is secreted out; after the grout is injected into the soil body, the water is further lost due to the filtering action of the soil body, so that the volume of the material is retracted, the hydration reaction of the cement-based grout material is incomplete due to the loss of the water, the strength of a solidified body is reduced, and even the cement-based grout material is cracked. The anti-bleeding polymer is a polymer with a three-dimensional network structure, has high water absorption and slow-release water functions, can effectively lock water in a grouting material by doping the anti-bleeding polymer in a cement-based material, slowly releases the water according to the requirement of a gelling reaction, not only prevents the volume from generating a large retraction problem, but also plays a role in maintaining a consolidated body in a hydration reaction. The anti-bleeding polymer contains a large amount of strong hydrophilic groups, has a three-dimensional network structure through proper crosslinking, can quickly absorb water which is dozens of times or even hundreds of times of the self mass through hydration, and is insoluble in water and organic solvents.
In some embodiments, during the preparation of the anti-bleeding polymer, the mass ratio of acrylic acid, acrylamide, initiator, cross-linking agent and deionized water is as follows: 100.
The degree of neutralization in the present invention means the molar ratio of acrylic acid neutralized with sodium hydroxide. For example, a neutralization level of 80% means that 80% of the acrylic acid is neutralized with sodium hydroxide. The calculation method of the neutralization degree is as follows:
M NaOH -the molar fraction of sodium hydroxide;
40-relative molecular mass of sodium hydroxide;
m NaOH -mass of sodium hydroxide;
M AA -the molar fraction of acrylic acid;
72-relative molecular mass of acrylic acid;
m AA -the mass of acrylic acid;
eta-degree of neutralization.
In some embodiments, the degree of neutralization is 10 to 90%.
In some embodiments, the crosslinker is N, N' -methylenebisacrylamide.
In some embodiments, the initiator is an inorganic peroxide initiator.
In one or more embodiments, the inorganic peroxide initiator is potassium persulfate, sodium persulfate, or ammonium persulfate.
In some embodiments, the surface cross-linking agent is present in an amount of 2.5% to 6% (mass percent) of the anti-bleeding polymer.
In some embodiments, the surface cross-linking agent is a mixture of ethylene glycol diglycidyl ether, glycerol, aluminum sulfate and water in a mass ratio of 1-5:1-5.
The invention provides a bleeding-proof grouting material for fracturing compaction grouting, which comprises the following components in parts by weight: 500 parts of Portland cement, 300-1000 parts of water, 1-20 parts of polycarboxylic acid water reducing agent, 1-50 parts of fumed silica and 1-30 parts of anti-bleeding polymer; wherein the anti-bleeding polymer is the anti-bleeding polymer applied to the above.
In some embodiments, 500 parts of Portland cement, 400-700 parts of water, 10-20 parts of polycarboxylic acid water reducing agent, 20-40 parts of fumed silica and 15-30 parts of bleeding-preventing polymer.
In one or more embodiments, 500 parts of portland cement, 550 parts of water, 15 parts of a polycarboxylate water reducer, 30 parts of fumed silica, and 22 parts of a bleeding preventing polymer.
In some embodiments, the anti-bleeding polymer has a particle size of less than 100 mesh. The slurry can be prevented from being injected, and after the polymer releases water, the slurry vein is split to form larger holes, so that the strength and the reinforcing effect of the slurry vein are influenced.
In some embodiments, the fumed silica, which is an amorphous silica product, has a primary particle size of 7 to 40nm, an aggregate particle size of about 200 to 500nm, and a specific surface area of 100 to 400m 2 G, high purity, siO 2 The content is not less than 99.8%.
In a third embodiment of the present invention, a preparation method of the bleeding-proof grouting material for split compaction grouting is provided, which includes the following steps:
mixing the anti-bleeding polymer with water to make the anti-bleeding polymer pre-absorb water to saturation;
adding portland cement, a polycarboxylic acid water reducing agent, a pre-water-saturation anti-bleeding polymer and fumed silica into water, and uniformly mixing and stirring to obtain the water-based anti-bleeding agent.
The silicate cement, the polycarboxylate water reducing agent, the gas-phase silica and the saturated water-absorbing polymer are fully and uniformly mixed, so that the problems that the saturated water-absorbing polymer is not uniformly mixed in a slurry mixture, the water distribution is not uniform, the uniformity of the hydration degree is influenced and the like are solved.
The bleeding-proof polymer plays an important role in the special material for the splitting compaction grouting, can absorb and lock water in the slurry material in advance, avoids water lost due to the effects of water separation and percolation in the splitting compaction grouting process, slowly releases water in the silicate cement hydration process, provides enough water for the grouting material, has a good internal maintenance effect, and enhances the strength of slurry veins.
In some embodiments, the anti-bleeding polymer is mixed with water in a mass ratio of 1.
The invention provides an application of the bleeding-proof grouting material for the splitting compaction grouting in grouting reinforcement by adopting a splitting compaction grouting method.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
The preparation method of the anti-bleeding polymer used in the following examples comprises the following steps:
taking 300g of acrylic acid to be diluted into an acrylic acid solution with the mass fraction of 40%, adding 100g of acrylamide, and fully stirring to dissolve the acrylamide to obtain a hydrophilic monomer solution A.
3g of a crosslinking agent was added to the hydrophilic monomer solution A obtained above, and the mixture was sufficiently stirred to be dissolved.
Adding 3g of ammonium persulfate, fully stirring to dissolve the ammonium persulfate, initiating polymerization reaction by externally heating to 70 ℃, and standing for 1h to form polymer gel.
Mincing the formed polymer gel by a meat mincer, and adding a sodium hydroxide solution with the mass of 66.7g and the mass fraction of 30% into the minced particles.
And (3) placing the neutralized gel particles in an oven at 100 ℃, drying for 120 minutes, further crushing by a grinder, and screening to obtain primary anti-bleeding polymer particles.
Weighing ethylene glycol diglycidyl ether, glycerol, aluminum sulfate and water in a mass ratio of 1:1:1: and 5, spraying a surface cross-linking agent with the mass of 45g on the surfaces of the primary anti-bleeding polymer particles, drying in an oven at the drying temperature of 100 ℃ for 30min, further crushing and screening, and obtaining the final product, namely the anti-bleeding polymer, wherein the particle size of the screened particles is less than 0.3 mm.
Example 1
A special material for splitting compaction grouting and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to the mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 550 parts of water, 15 parts of polycarboxylic acid water reducing agent, 30 parts of gas-phase silicon dioxide and 22 parts of anti-bleeding polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed Portland cement and the solid powder of the polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retained water bleeding-preventing polymer to obtain the splitting compaction grouting material.
And the water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of the gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters such as compressive strength, breaking strength, initial and final setting time, bleeding rate, drying shrinkage and the like of the splitting compaction grouting material prepared in the embodiment are shown in tables 1, 2, 3, 4 and 5:
TABLE 1 uniaxial compressive strength of split compaction grouting materials
Uniaxial compressive strength refers to the load which can be borne on a unit area when a rock test piece is stressed in one direction until the rock test piece is damaged, is called compressive strength for short, and refers to the ultimate failure strength obtained when the test piece is stressed in one direction only. The test result shows that the compressive strength of the splitting compaction grouting material is increased along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 34.5MPa.
TABLE 2 fracture Strength of fracturing compaction grouting Material
The flexural strength refers to the ultimate breaking stress of a material when the material bears a bending moment per unit area. The test result shows that the fracture strength of the splitting compaction grouting material is increased along with the increase of time, and the fracture strength of the fracturing compaction grouting material in 28 days can reach 9.8MPa.
TABLE 3 setting time of split compacted grouting materials
The setting time is divided into an initial setting time and a final setting time. The initial setting time is the time required from the mixing of cement and water until the cement paste begins to lose plasticity. The final set time is the time required from when the cement mixes with water until the cement paste loses plasticity completely and begins to develop strength. According to test results, the initial and final setting time of the splitting compaction grouting material doped with the bleeding-preventing polymer is continuously shortened. The initial setting time is 32min, and the final setting time is only 83min.
TABLE 4 bleeding rate of the split compacted grouting material
The bleeding of cement slurry refers to the upward movement of water before the volume of cement static slurry is fixed but not condensed, mainly caused by the fact that aggregate particles of a newly-mixed mixture cannot absorb all mixed water, the bleeding rate refers to the ratio of the bleeding amount to the water content of a paste mixture, 1000ml of splitting, squeezing and grouting material is filled into a 1000ml organic glass measuring cylinder, the height of the grouting surface of the material is measured and recorded, and then the separated water surface and the cement surface are measured after the static placement for 3 hours and 24 hours. The bleeding rate is determined by dividing the height of the isolated water by the height of the original irrigation. The test results show that the bleeding rate of the splitting compaction grouting material doped with the bleeding-proof polymer is greatly reduced. The bleeding rate is only 2%.
TABLE 5 drying shrinkage of split compaction grouting materials
The test results show that the drying shrinkage of the grouting material is greatly reduced by doping the bleeding-preventing polymer, the drying shrinkage after 30 days is only 1265 microstrain, and experiments prove that the split compaction grouting material has good drying shrinkage prevention capability.
As shown in figure 1, cement hydration products are attached to the surfaces of cement particles, and the materials are proved to be relatively sufficient in reaction, relatively dense in consolidated body and relatively high in strength. Therefore, the anti-bleeding polymer has good effects of preventing percolation and volume retraction and providing maintenance effect of a humidity environment.
FIG. 2 shows the water separation of the splitting compaction grouting material under different anti-bleeding polymer mixing amounts. 1000ml of the splitting compaction grouting material prepared in the embodiment 1 is poured into two organic glass measuring cylinders of 1000ml respectively and stands for 3 hours. The experimental result is shown in the figure, and a certain amount of anti-bleeding polymer is added to play a role in absorbing and retaining water.
Example 2
A splitting compaction material and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 450 parts of water, 5 parts of a polycarboxylate superplasticizer, 10 parts of fumed silica and 5 parts of a bleeding-preventing polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed Portland cement and the solid powder of the polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retained water bleeding-preventing polymer to obtain the splitting compaction grouting material.
And the water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of the gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters of the splitting compaction grouting material prepared in the embodiment, such as compressive strength, flexural strength, initial and final setting time, bleeding rate, drying shrinkage, and the like, are shown in tables 6, 7, 8, 9, and 10:
TABLE 6 uniaxial compressive strength of splitting compaction grouting material
The test result shows that the compressive strength of the splitting compaction grouting material is in a rising trend along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 39.2MPa.
TABLE 7 fracture Strength of the cleavage compacted grouting Material
The test result shows that the fracture strength of the splitting compaction grouting material is increased along with the increase of time, and the fracture strength of the fracturing compaction grouting material in 28 days can reach 7.0MPa.
TABLE 8 setting time of split compacted grouting materials
According to test results, the initial and final setting time of the splitting compaction grouting material doped with the bleeding-preventing polymer is continuously shortened. The initial setting time was 58min, and the final setting time was only 186min.
TABLE 9 bleeding rate of splitting compaction grouting material
The bleeding of cement slurry refers to that water moves upwards before the volume of cement slurry is fixed but not condensed, mainly caused by that aggregate particles of a newly-mixed mixture cannot absorb all mixed water, the bleeding rate refers to the ratio of the bleeding amount to the water content of a paste mixture, 1000ml of splitting, squeezing and grouting material is filled in a 1000ml organic glass measuring cylinder, the height of the grouting surface of the material is measured and recorded, and then the segregation water surface and the cement surface are measured after standing for 3h and 24 h. The bleeding rate is obtained by dividing the height of the isolated water by the height of the original filling. According to the test results, the bleeding rate of the splitting compaction grouting material doped with the bleeding-preventing polymer is reduced. The bleeding rate is only 10%.
TABLE 10 Dry shrinkage of split compaction grouting materials
The test result shows that the drying shrinkage of the grouting material is greatly reduced by the incorporation of the bleeding-preventing polymer, the drying shrinkage after 30 days is only 1879 microstrain, and the experiment proves that the split compaction grouting material has good drying shrinkage prevention capability.
Example 3
A splitting compaction material and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 500 parts of water, 10 parts of polycarboxylic acid water reducing agent, 20 parts of fumed silica and 15 parts of bleeding-preventing polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed portland cement and solid powder of a polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retained water bleeding-preventing polymer to obtain the splitting compaction grouting material.
The water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters of the splitting compaction grouting material prepared in the embodiment, such as compressive strength, flexural strength, initial and final setting time, bleeding rate, drying shrinkage, and the like, are shown in tables 11, 12, 13, 14, and 15:
TABLE 11 uniaxial compressive strength of split compaction grouting material
The test result shows that the compressive strength of the splitting compaction grouting material is increased along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 30.7MPa.
TABLE 12 fracture Strength of the split compacted grouting Material
The test result shows that the fracture strength of the splitting compaction grouting material is increased along with the increase of time, and the fracture strength of the fracturing compaction grouting material in 28 days can reach 30.7MPa.
TABLE 13 setting time for split compacted grouting materials
According to test results, the initial and final setting time of the splitting compaction grouting material doped with the bleeding-preventing polymer is continuously shortened. The initial setting time was 49min and the final setting time was only 153min.
TABLE 14 bleeding rate of split compacted grouting materials
The test results show that the bleeding rate of the splitting compaction grouting material doped with the bleeding-proof polymer is reduced. The bleeding rate is only 6%.
Watch 15 split compaction grouting material drying shrinkage
The test results show that the drying shrinkage of the grouting material is greatly reduced by doping the bleeding-preventing polymer, the drying shrinkage after 30 days is only 1749 microstrain, and experiments prove that the split compaction grouting material has good drying shrinkage prevention capability.
Example 4
A splitting compaction material and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to the mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 550 parts of water, 15 parts of polycarboxylic acid water reducing agent, 30 parts of gas-phase silicon dioxide and 25 parts of anti-bleeding polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed Portland cement and the solid powder of the polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retention water bleeding prevention polymer to obtain the splitting compaction grouting material.
And the water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of the gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters of the splitting compaction grouting material prepared in the embodiment, such as compressive strength, flexural strength, initial and final setting time, bleeding rate, drying shrinkage, are shown in tables 16, 17, 18, 19 and 20:
TABLE 16 uniaxial compressive strength of split compaction grouting material
The test result shows that the compressive strength of the splitting compaction grouting material is increased along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 34.0MPa.
TABLE 17 fracture-resisting strength of split compacted grouting material
According to the test results, the breaking strength of the splitting compaction grouting material is in a rising trend along with the increase of time, and the breaking strength of the material in 28 days can reach 9.4MPa.
TABLE 18 setting time of split compacted grouting materials
According to test results, the initial and final setting time of the splitting compaction grouting material doped with the anti-bleeding polymer is continuously shortened. The initial setting time is 40min, and the final setting time is only 111min.
TABLE 19 bleeding rate of split compaction grouting material
The test results show that the bleeding rate of the splitting compaction grouting material doped with the bleeding-proof polymer is reduced. The bleeding rate is only 1.5%.
Watch 20 drying shrinkage of split compaction grouting material
According to test results, the bleeding-preventing polymer is doped, so that the drying shrinkage of the grouting material is greatly reduced, the drying shrinkage after 30 days is 1183 microstrain, and experiments prove that the split compaction grouting material has good drying shrinkage prevention capability.
Example 5
A splitting compaction material and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 600 parts of water, 10 parts of polycarboxylic acid water reducing agent, 20 parts of fumed silica and 15 parts of bleeding-preventing polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed Portland cement and the solid powder of the polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retained water bleeding-preventing polymer to obtain the splitting compaction grouting material.
The water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters of the splitting compaction grouting material prepared in the embodiment, such as compressive strength, flexural strength, initial and final setting time, bleeding rate, drying shrinkage, are shown in tables 21, 22, 23, 24 and 25:
uniaxial compressive strength of table 21 splitting compaction grouting material
The test result shows that the compressive strength of the splitting compaction grouting material is increased along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 27.4MPa.
Anti-breaking strength of table 22 splitting compaction grouting material
According to the test results, the breaking strength of the splitting compaction grouting material is in a rising trend along with the increase of time, and the breaking strength of the material in 28 days can reach 6.5Mpa.
TABLE 23 setting time for split compacted grouting materials
According to test results, the initial and final setting time of the splitting compaction grouting material doped with the anti-bleeding polymer is continuously shortened. The initial setting time is 60min, and the final setting time is only 207min.
TABLE 24 bleeding rate of split compaction grouting material
According to the test results, the bleeding rate of the splitting compaction grouting material doped with the bleeding-preventing polymer is reduced. The bleeding rate is only 6%.
Watch 25 drying shrinkage of split compaction grouting material
According to test results, the drying shrinkage of the grouting material is greatly reduced by doping the bleeding-preventing polymer, the drying shrinkage after 30 days is only 2078 microstrain, and experiments prove that the splitting compaction grouting material has good drying shrinkage prevention capability.
Example 6
A splitting compaction material and a preparation method thereof comprise the following steps:
the method comprises the following steps: weighing raw materials according to mass fraction, wherein the raw materials comprise 500 parts of Portland cement, 700 parts of water, 5 parts of a polycarboxylate superplasticizer, 10 parts of fumed silica and 5 parts of a bleeding-preventing polymer.
Step two: mixing the screened anti-bleeding polymer with water according to a ratio of 1;
step three: mixing the weighed Portland cement and the solid powder of the polycarboxylic acid water reducing agent;
step four: and uniformly mixing the water, the fumed silica, the solid powder mixture and the pre-retention water bleeding prevention polymer to obtain the splitting compaction grouting material.
And the water, the fumed silica and the solid powder mixture in the fourth step are fully and uniformly mixed with the water-preserving and bleeding-preventing polymer, so that the problems that the local pores of the gel are too large, the strength is reduced and the like due to the fact that the bleeding-preventing polymer is not uniformly mixed in the splitting compaction grouting material are solved.
The measurement results of the performance parameters such as compressive strength, breaking strength, initial and final setting time, bleeding rate, drying shrinkage and the like of the splitting compaction grouting material prepared in the embodiment are shown in tables 26, 27, 28, 29 and 30:
uniaxial compressive strength of 26-split compaction grouting material
The test result shows that the compressive strength of the splitting compaction grouting material is in a rising trend along with the time, and the compressive strength of the splitting compaction grouting material in 28 days can reach 28.0MPa.
Anti-breaking strength of meter 27 splitting compaction grouting material
The test result shows that the fracture strength of the splitting compaction grouting material is increased along with the increase of time, and the fracture strength of the fracturing compaction grouting material in 28 days can reach 6.8MPa.
Meter 28 setting time of split compaction grouting material
According to test results, the initial and final setting time of the splitting compaction grouting material doped with the bleeding-preventing polymer is shortened compared with that of a cement grouting material with the same water cement ratio. The initial setting time is 85min, and the final setting time is only 307min.
TABLE 24 bleeding rate of split compaction grouting material
The test results show that the bleeding rate of the splitting compaction grouting material doped with the bleeding-proof polymer is reduced. The bleeding rate is only 10%.
Watch 30 split compaction grouting material drying shrinkage
The test results show that the drying shrinkage of the grouting material is reduced by adding a small amount of the bleeding-preventing polymer, the drying shrinkage after 30 days is only 2437 microstrain, and experiments prove that the split compaction grouting material has good drying shrinkage preventing capability.
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 application of the bleeding-proof polymer in the splitting compaction grouting is characterized in that the preparation process of the bleeding-proof polymer is as follows: carrying out a polymer reaction on acrylic acid, acrylamide, an initiator and a crosslinking agent in water according to a mass ratio of 100-40.
2. The use of claim 1, wherein in the preparation process of the anti-bleeding polymer, the mass ratio of acrylic acid, acrylamide, initiator, cross-linking agent and deionized water is as follows: 100;
or, the neutralization degree is 10-90%;
or, the cross-linking agent is N, N' -methylene bisacrylamide;
or, the initiator is an inorganic peroxide initiator; preferably, the inorganic peroxide initiator is potassium persulfate, sodium persulfate, or ammonium persulfate;
or the dosage of the surface cross-linking agent is 2.5 to 6 percent of the anti-bleeding polymer by mass percent;
or the surface cross-linking agent is a mixture of ethylene glycol diglycidyl ether, glycerol, aluminum sulfate and water according to the mass ratio of 1-5:1-5.
3. The bleeding-preventing grouting material for fracturing compaction grouting is characterized by comprising the following components in parts by weight: 500 parts of Portland cement, 300-1000 parts of water, 1-20 parts of polycarboxylic acid water reducing agent, 1-50 parts of fumed silica and 1-30 parts of anti-bleeding polymer; wherein the bleeding-preventing polymer is the bleeding-preventing polymer in the use according to claim 1 or 2.
4. The bleeding-preventing grouting material for split squeeze grouting according to claim 3, wherein 500 parts of portland cement, 400 to 700 parts of water, 10 to 20 parts of a polycarboxylate superplasticizer, 20 to 40 parts of fumed silica, and 15 to 30 parts of a bleeding-preventing polymer.
5. The bleeding-preventing grouting material for fracturing squeeze grouting according to claim 3, characterized in that portland cement 500 parts, water 550 parts, polycarboxylate superplasticizer 15 parts, fumed silica 30 parts, and bleeding-preventing polymer 22 parts.
6. The bleeding-preventing grouting material for split squeeze grouting of claim 3, wherein the grain size of the bleeding-preventing polymer is less than 100 mesh.
7. The bleeding-preventing grouting material for split squeeze grouting according to claim 3, wherein the fumed silica has a primary particle size of 7 to 40nm, an aggregate particle size of 200 to 500nm, and a specific surface area of 100 to 400m 2 /g，SiO 2 The content is not less than 99.8%.
8. A method of preparing a bleeding-preventing grouting material for split squeeze grouting according to claim 3, characterized by comprising the steps of:
mixing the anti-bleeding polymer with water to make the anti-bleeding polymer pre-absorb water to saturation;
adding portland cement, a polycarboxylic acid water reducing agent, a pre-water-saturation anti-bleeding polymer and fumed silica into water, and uniformly mixing and stirring to obtain the water-based anti-bleeding agent.
9. The preparation method of the bleeding-preventing grouting material for split squeeze grouting according to claim 8, wherein the bleeding-preventing polymer is mixed with water according to a mass ratio of 1.
10. Use of the bleeding-preventing grouting material for split compaction grouting according to any one of claims 3 to 7 in grouting reinforcement by a split compaction grouting method.
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|---|---|---|---|---|
| CN1513799A (en) * | 2003-07-24 | 2004-07-21 | 上海隧道工程股份有限公司 | Slip casting slurry used in controlled densification slip casting method |
| CN109824319A (en) * | 2018-09-28 | 2019-05-31 | 江苏苏博特新材料股份有限公司 | A kind of no sand mold metro shield grouting material and preparation method thereof |
| CN112094367A (en) * | 2020-08-10 | 2020-12-18 | 山东大学 | Bleeding-preventing polymer, low-retraction filling solid waste material, preparation method and application |
| CN113003978A (en) * | 2020-12-31 | 2021-06-22 | 北京瑞达展业铁道工程技术有限公司 | Special cement additive for grouting and use method thereof |
| CN114233338A (en) * | 2021-09-28 | 2022-03-25 | 安徽建筑大学 | Grouting transformation construction process for loose aquifer of coal mine |
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- 2022-08-11 CN CN202210959668.3A patent/CN115385596B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513799A (en) * | 2003-07-24 | 2004-07-21 | 上海隧道工程股份有限公司 | Slip casting slurry used in controlled densification slip casting method |
| CN109824319A (en) * | 2018-09-28 | 2019-05-31 | 江苏苏博特新材料股份有限公司 | A kind of no sand mold metro shield grouting material and preparation method thereof |
| CN112094367A (en) * | 2020-08-10 | 2020-12-18 | 山东大学 | Bleeding-preventing polymer, low-retraction filling solid waste material, preparation method and application |
| CN113003978A (en) * | 2020-12-31 | 2021-06-22 | 北京瑞达展业铁道工程技术有限公司 | Special cement additive for grouting and use method thereof |
| CN114233338A (en) * | 2021-09-28 | 2022-03-25 | 安徽建筑大学 | Grouting transformation construction process for loose aquifer of coal mine |
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