CN114573278B - Shield grouting material and preparation method thereof - Google Patents
Shield grouting material and preparation method thereof Download PDFInfo
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- CN114573278B CN114573278B CN202210289711.XA CN202210289711A CN114573278B CN 114573278 B CN114573278 B CN 114573278B CN 202210289711 A CN202210289711 A CN 202210289711A CN 114573278 B CN114573278 B CN 114573278B
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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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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/44—Thickening, gelling or viscosity increasing 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
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
- C04B2111/00672—Pointing or jointing materials
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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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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of building materials, and particularly discloses a shield grouting material and a preparation method thereof; the shield grouting material comprises the following raw materials in parts by weight: 80-120 parts of cement, 180-300 parts of fly ash, 200-350 parts of sand, 50-80 parts of bentonite, 2-4 parts of thickening agent, 0.5-1.5 parts of expanding agent and 0.5-3 parts of water reducing agent; the thickening agent comprises silica fume, hydroxypropyl methyl cellulose and diallyl phthalate; the shield grouting material prepared by the application has a high coagulation speed.
Description
Technical Field
The application relates to the field of building materials, in particular to a shield grouting material and a preparation method thereof.
Background
The shield grouting material is a synchronous grouting material used for filling a building gap between a tunnel body and a segment ring in subway shield construction, and has the effects of preventing surface subsidence, stabilizing segments and preventing segment deviation. The primary function of the grouting material is to fill the voids, stabilize the segments, and prevent surface subsidence and segment migration.
The shield grouting material goes through several stages of original inert grouting material, cement-based active grouting material, chemical grouting material, modern modified grouting material and the like, and different grouting materials can be selected according to different geological conditions and economic benefits through continuous updating and updating.
However, the grouting material is not suitable for a water-rich stratum with a large permeability coefficient, and when shield construction is carried out, the water-rich stratum can be diluted by underground water after being injected by the traditional grouting material, so that the expected synchronous grouting effect cannot be achieved.
Disclosure of Invention
In order to improve the coagulation speed of the shield grouting material, the application provides the shield grouting material and the preparation method thereof.
In a first aspect, the application provides a shield grouting material, which adopts the following technical scheme:
the shield grouting material comprises the following raw materials in parts by weight: 80-120 parts of cement, 180-300 parts of fly ash, 200-350 parts of sand, 50-80 parts of bentonite, 2-4 parts of thickening agent, 0.5-1.5 parts of expanding agent and 0.5-3 parts of water reducing agent; the thickening agent comprises silica fume, hydroxypropyl methyl cellulose and diallyl phthalate.
By adopting the technical scheme, the thickening agent and the expanding agent are added into the shield grouting material, so that the coagulation speed of the prepared shield grouting material is improved. The thickening agent added into the shield grouting material can greatly improve the water dispersibility resistance of the shield grouting material, reduce the bleeding rate and the layering degree of the material, improve the stability of the material and improve the comprehensive performance of the material; the silica fume in the thickening agent is amorphous spherical particles, the surface is smooth, the specific surface area is large, the activity is high, the tiny spherical particles can play a role in lubrication and have extremely strong cementing power, and the silica fume not only has a tackifying effect, but also can improve the compressive strength of a grouting material; the dispersibility of cement-sand is improved, and the plasticity and water-retaining property of the mortar material are greatly improved, so that the coagulation speed of the grouting material can be improved, the cement strength can be enhanced, and the effect of reducing the generation of cracks is reduced; the expanding agent in the shield grouting material generates a product with enlarged volume through a hydration reaction with cement and water in the grouting material, so that the volume expansion of the slurry of the shield grouting material is caused, chemical shrinkage generated when the cement is hydrated and dry shrinkage generated by free water loss are offset, the shield grouting material is filled more fully, and meanwhile, the coagulation speed of the shield grouting material is improved.
Preferably, the shield grouting material comprises the following raw materials in parts by weight: 90-110 parts of cement, 220-280 parts of fly ash, 250-300 parts of sand, 60-70 parts of bentonite, 2.5-3.5 parts of thickening agent, 0.8-1.2 parts of expanding agent and 1-2 parts of water reducing agent.
By adopting the technical scheme, the application optimizes the using amount of each raw material of the shield grouting material, so that when the using amount of the shield grouting material is in the range, the coagulation speed, the compressive strength and the water dispersibility of the prepared shield grouting material are improved to some extent.
Preferably, the thickener comprises the following components in parts by weight: 5-15 parts of silica fume, 0.5-1 part of hydroxypropyl methyl cellulose and 2-4 parts of diallyl phthalate.
By adopting the technical scheme, the silica fume, the hydroxypropyl methyl cellulose and the diallyl phthalate are compounded according to the using amount to obtain the thickening agent, and then the thickening agent is used in the preparation process of the shield grouting material, so that the coagulation speed of the shield grouting material is improved.
Preferably, the hydroxypropyl methylcellulose has an average particle size of 80-100 mesh.
By adopting the technical scheme, the coagulation time of the finally prepared shield grouting material is shortened by limiting the average particle size of the hydroxypropyl methyl cellulose, and the performance of the shield grouting material has no obvious difference when the average particle size of the hydroxypropyl methyl cellulose is within the range.
Preferably, the expanding agent comprises the following components in parts by weight: 5-10 parts of calcium sulphoaluminate, 4-8 parts of calcium oxide and 4-6 parts of magnesium oxide.
By adopting the technical scheme, the expanding agent is obtained by compounding calcium sulphoaluminate, calcium oxide and magnesium oxide according to a certain proportion, and the calcium sulphoaluminate expanding agent is added into cement and then is hydrated with cement minerals or reacts with cement hydration products to form trisulfide hydrated calcium sulphoaluminate, so that the solid phase volume is greatly increased, and the apparent volume is expanded; the expansion effect of the calcium oxide and magnesium oxide expanding agents is mainly characterized in that calcium oxide crystals and magnesium oxide crystals are hydrated to form calcium hydroxide crystals and magnesium hydroxide crystals, so that the volume expansion is caused; when the weight parts of the calcium sulphoaluminate, the calcium oxide and the magnesium oxide are within the range, the performance of the prepared shield grouting material has no obvious difference.
Preferably, the expanding agent further comprises 2-4 parts by weight of gypsum.
By adopting the technical scheme, the main component of the gypsum is the hydrate of calcium sulfate, a certain amount of gypsum is added into the expanding agent, the hydration of anhydrous calcium sulphoaluminate in the self composition participates in the hydration of cement minerals or reacts with cement hydration products to form trisulfide hydrated calcium sulphoaluminate (ettringite), and the generation of an ettringite phase increases the solid phase volume greatly to cause the apparent volume expansion, and simultaneously the strength of the shield grouting material can be enhanced to a certain extent.
Preferably, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
By adopting the technical scheme, the polycarboxylic acid high-performance water reducing agent has the characteristics of high water reducing rate and good dispersibility, and can obviously improve the fluidity of the shield grouting material.
In a second aspect, the present application provides a method for preparing a shield grouting material, which adopts the following technical scheme:
a preparation method of a shield grouting material comprises the following steps:
1) Uniformly mixing silica fume, hydroxypropyl methyl cellulose and diallyl phthalate to obtain a thickening agent;
2) Uniformly mixing calcium sulphoaluminate, calcium oxide and magnesium oxide to obtain an expanding agent;
3) And adding the thickening agent and the expanding agent into cement, fly ash, sand, bentonite and a water reducing agent, and uniformly mixing to obtain the shield grouting material.
By adopting the technical scheme, the shield grouting material is uniformly mixed according to a certain sequence, so that the thickening agent and the expanding agent are uniformly dispersed in the grouting material, and the prepared shield grouting material has higher coagulation capacity.
In summary, the present application has the following beneficial effects:
1. the thickening agent and the expanding agent are added into the shield grouting material, so that the coagulation speed of the prepared shield grouting material is improved. The thickening agent added into the shield grouting material can greatly improve the water dispersibility resistance of the shield grouting material, reduce the bleeding rate and the layering degree of the material, improve the stability of the material and improve the comprehensive performance of the material; the silica fume in the thickening agent is amorphous spherical particles, the surface is smooth, the specific surface area is large, the activity is high, the tiny spherical particles can play a role in lubrication and have extremely strong cementing power, and the silica fume not only has a tackifying effect, but also can improve the compressive strength of a grouting material; the dispersibility of cement-sand is improved, the plasticity and water retention of the mortar material are greatly improved, and the mortar has the effects of enhancing the strength of cement and reducing the generation of cracks; the expanding agent in the shield grouting material generates a product with enlarged volume through a hydration reaction with cement and water in the grouting material, so that the volume expansion of the slurry of the shield grouting material is caused, chemical shrinkage generated when the cement is hydrated and dry shrinkage generated by free water loss are offset, the shield grouting material is filled more fully, and the coagulation speed of the shield grouting material can be improved.
2. The expanding agent is obtained by compounding calcium sulphoaluminate, calcium oxide and magnesium oxide according to a certain proportion, and the calcium sulphoaluminate expanding agent is added into cement and then is hydrated with cement minerals or reacts with cement hydration products to form trisulfide hydrated calcium sulphoaluminate, so that the solid phase volume is greatly increased, and the apparent volume is expanded; the expansion effect of the calcium oxide and magnesium oxide expansion agents is mainly caused by the fact that calcium oxide crystals and magnesium oxide crystals are hydrated to form calcium hydroxide crystals and magnesium hydroxide crystals, and volume expansion is caused.
3. The shield grouting material prepared in the application can be finally measured to be capable of shortening the setting time to 8.5h through detection, the consistency of the material is 118mm, the fluidity is 271mm, and the 28d land-water strength ratio is 0.98%.
Detailed Description
The present application will be described in further detail with reference to examples.
Starting materials
Cement: the manufacturer is Beijing Jie's An architecture Co., ltd;
fly ash: the manufacturer is a flying stone processing factory in the red bridge area of Tianjin;
bentonite: the manufacturer is Hebei-Yi mineral products, inc.;
silica fume: the manufacturer is Hebei province Gaokang mineral products Limited company; hydroxypropyl methylcellulose: the manufacturer is Shandong Qingyi Xin chemical technology company; diallyl phthalate: the manufacturer is Jinan Zi' an chemical industry Co., ltd;
calcium sulfoaluminate: the manufacturer is Tangshan polar bear building materials Co., ltd; calcium oxide: the manufacturer is Beijing Yulu building engineering Co., ltd; magnesium oxide: the manufacturer is Shanghai Kayin chemical Co., ltd; gypsum: the manufacturer is Shanghai Guanlin building materials Co., ltd;
polycarboxylic acid high-performance water reducing agent: the pH was 8.92 and the manufacturer was Shandong bock chemical Co., ltd.
Preparation example
Preparation examples 1 to 3
The thickeners of preparation examples 1 to 3, which are shown in Table 1, were prepared by the following steps:
weighing the raw materials according to the dosage in the table 1, and then uniformly stirring the raw materials to obtain the thickening agent.
TABLE 1 thickener of preparation examples 1-3 raw materials and amounts (kg) of raw materials
| Preparation example 1 | Preparation example 2 | Preparation example 3 | |
| Silica fume | 5 | 10 | 15 |
| Hydroxypropyl methylcellulose | 1 | 0.8 | 0.5 |
| Diallyl phthalate | 2 | 3 | 4 |
Preparation examples 4 to 6
The swelling agent of preparation examples 4 to 6, the raw materials and the amounts of the raw materials are shown in Table 2, and the preparation steps are as follows:
weighing the raw materials according to the dosage in the table 2, and then uniformly stirring the raw materials to obtain the expanding agent.
TABLE 2 preparation examples 4-6 of swelling agent raw materials and the amounts (kg) of the raw materials
| Preparation example 4 | Preparation example 5 | Preparation example 6 | |
| Aluminium calcium sulfate | 5 | 8 | 10 |
| Calcium oxide | 8 | 6 | 4 |
| Magnesium oxide | 4 | 5 | 6 |
Examples
Examples 1 to 4
The shield grouting material of examples 1-4, the raw materials and the amounts of the raw materials are shown in table 3, and the preparation steps are as follows:
1) Uniformly mixing the silica fume, the hydroxypropyl methyl cellulose and the diallyl phthalate to obtain a thickening agent;
2) Uniformly mixing calcium sulphoaluminate, calcium oxide and magnesium oxide to obtain an expanding agent;
3) And adding the thickening agent and the expanding agent into cement, fly ash, sand, bentonite and a water reducing agent, and uniformly mixing to obtain the shield grouting material.
Wherein the thickening agent is from preparation example 1, the swelling agent is from preparation example 4, the average particle size of the hydroxypropyl methyl cellulose is 80 meshes, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
TABLE 3 raw materials and amounts (kg) of raw materials of examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Cement | 80 | 90 | 110 | 120 |
| Fly ash | 300 | 280 | 220 | 180 |
| Sand | 200 | 250 | 300 | 350 |
| Bentonite clay | 80 | 70 | 60 | 50 |
| Thickening agent | 2 | 2 | 2 | 2 |
| Expanding agent | 0.5 | 0.8 | 1.2 | 1.5 |
| Water reducing agent | 3 | 2 | 1 | 0.5 |
Example 5
A shield grouting material is different from the shield grouting material in example 3 in that the thickening agent added is from preparation example 2, and the rest steps are the same as those of example 3.
Example 6
A shield grouting material is different from the shield grouting material in example 3 in that the thickening agent added is from preparation example 3, and the rest steps are the same as those in example 3.
Example 7
A shield grouting material is different from the shield grouting material in the embodiment 5 in that the average particle size of hydroxypropyl methyl cellulose in a thickening agent is 100 meshes, and the rest steps are the same as the embodiment 5.
Example 8
A shield grouting material is different from the shield grouting material in the embodiment 7 in that the addition amount of a thickening agent is 2.5kg, and the rest steps are the same as the embodiment 7.
Example 9
A shield grouting material is different from the shield grouting material in the embodiment 7 in that the addition amount of a thickening agent is 3.5kg, and the rest steps are the same as the embodiment 7.
Example 10
The shield grouting material is different from the shield grouting material in example 7 in that the addition amount of the thickening agent is 4kg, and the rest steps are the same as those in example 7.
Example 11
A shield grouting material is different from the shield grouting material in example 10 in that an expanding agent is added from preparation example 5, and the rest steps are the same as those of example 10.
Example 12
A shield grouting material is different from the shield grouting material in example 10 in that an expanding agent is added from preparation example 6, and the rest steps are the same as those of example 10.
Example 13
A shield grouting material is different from the shield grouting material in the embodiment 11 in that 2kg of gypsum is added in an expanding agent, and the rest steps are the same as the embodiment 11.
Example 14
A shield grouting material is different from the shield grouting material in the embodiment 11 in that gypsum of 3kg is added into an expanding agent, and the rest steps are the same as the embodiment 11.
Example 15
A shield grouting material is different from the shield grouting material in the embodiment 11 in that gypsum of 4kg is added in an expanding agent, and the rest steps are the same as the embodiment 11.
Comparative example
Comparative example 1
The shield grouting material is different from the shield grouting material in the embodiment 1 in that the addition amount of the thickening agent is 0, and the rest steps are the same as the steps in the embodiment 1.
Comparative example 2
The shield grouting material is different from the shield grouting material in the embodiment 1 in that the addition amount of the silica fume in the thickening agent is 0, and the rest steps are the same as those in the embodiment 1.
Comparative example 3
The shield grouting material is different from the shield grouting material in the embodiment 1 in that the addition amount of hydroxypropyl methylcellulose in the thickening agent is 0, and the rest steps are the same as the steps in the embodiment 1.
Comparative example 4
A shield grouting material is different from the shield grouting material in the embodiment 1 in that the addition amount of diallyl phthalate in a thickening agent is 0, and the rest steps are the same as the embodiment 1.
Performance test
Detection method/test method
The shield grouting materials were prepared according to the preparation methods of the shield grouting materials of examples 1 to 15 and comparative examples 1 to 4, and then tested according to the following test methods, and the test results are shown in table 4.
And (3) testing the thickness of the slurry: according to JGJ70-90 'basic performance test method of building mortar', a mortar consistometer is adopted for testing.
Testing the flowing property of the slurry: according to GB/T2419-2005 'Cement mortar fluidity determination method', a cement mortar fluidity determination instrument is adopted.
And (3) testing the setting time of the slurry: according to JGJ70-90 'basic performance test method of building mortar', a mortar setting time tester is adopted for testing.
Testing the layering degree: refer to JGJ70-90 building mortar basic performance test method.
And (3) testing the bleeding rate: refer to JGJ70-90 building mortar basic performance test method.
TABLE 4 test results of examples 1 to 15 and comparative examples 1 to 4
| Consistency/mm | Fluidity/mm | Coagulation time/h | Degree of delamination/mm | Bleeding rate/%) | 28d land strength ratio/%) | |
| Example 1 | 100 | 236 | 12.3 | 1 | 0.2 | 0.79 |
| Example 2 | 100 | 235 | 12.2 | 1 | 0.2 | 0.78 |
| Example 3 | 102 | 242 | 11.9 | 0 | 0.1 | 0.82 |
| Example 4 | 101 | 240 | 12.0 | 1 | 0.2 | 0.79 |
| Example 5 | 104 | 248 | 11.4 | 0 | 0.1 | 0.86 |
| Example 6 | 102 | 243 | 11.6 | 0 | 0.1 | 0.83 |
| Example 7 | 106 | 254 | 11.0 | 0 | 0.1 | 0.88 |
| Example 8 | 105 | 251 | 10.8 | 0 | 0 | 0.89 |
| Example 9 | 106 | 256 | 10.4 | 0 | 0 | 0.91 |
| Example 10 | 108 | 259 | 10.1 | 0 | 0 | 0.92 |
| Example 11 | 112 | 265 | 9.5 | 0 | 0 | 0.95 |
| Example 12 | 110 | 261 | 9.7 | 0 | 0 | 0.93 |
| Example 13 | 115 | 267 | 9.2 | 0 | 0 | 0.95 |
| Example 14 | 116 | 269 | 8.7 | 0 | 0 | 0.97 |
| Example 15 | 118 | 271 | 8.5 | 0 | 0 | 0.98 |
| Comparative example 1 | 84 | 208 | 17.2 | 1 | 0.5 | 0.64 |
| Comparative example 2 | 89 | 219 | 15.3 | 1 | 0.3 | 0.71 |
| Comparative example 3 | 86 | 220 | 15.9 | 1 | 0.3 | 0.68 |
| Comparative example 4 | 91 | 218 | 14.9 | 1 | 0.3 | 0.72 |
As can be seen from the data in Table 4, the coagulation speed of the shield grouting material prepared by adding the thickening agent and the expanding agent into the shield grouting material and blending the thickening agent, the expanding agent, the cement, the fly ash, the sand, the bentonite and the water reducing agent is improved.
According to the detection data of the embodiment 3 and the embodiments 5-6, the thickening agent of the preparation example 2 is better in proportioning, and the shield grouting material prepared from the thickening agent of the preparation example 2 has the advantages of shortened setting time, increased consistency and fluidity, 0mm of stratification degree, 0.1% of bleeding rate and reduced 28d land-water strength ratio. In combination with the test data of example 7, it can be seen that when the average particle size of the hydroxypropyl methylcellulose is 100 meshes, the setting time is shorter, and the consistency and the fluidity of the shield grouting material are increased.
Combining the test data of example 7 and examples 8-10, it can be seen that as the addition amount of the thickening agent increases, the shorter the setting time of the prepared shield grouting material, the gradually increased consistency and fluidity, and the 28d land-water strength ratio decreases. When the thickener is added in an amount of 4kg, the setting time is shortened to 10.1h, at which the material has a consistency of 108mm, a fluidity of 259mm and a 28d land-water strength ratio of 0.92 percent.
It can be seen from the combination of the test data of example 10 and examples 11-12 that the shield grouting material prepared from the swelling agent of preparation example 5 has the advantages of shortened setting time, increased consistency and fluidity, 0 degree of stratification and bleeding rate, and increased 28d land-water strength ratio.
Combining the test data of example 11 and examples 13-15, it can be seen that the setting time of the shield grouting material can be shortened when gypsum is added into the expanding agent, and when the addition amount of gypsum is 4kg, the setting time is shortened to 8.5h, the consistency of the material is 118mm, the fluidity is 271mm, and the 28d land-water strength ratio is 0.98%.
The combination of the test data of example 1 and comparative examples 1-4 shows that the addition of the thickener can increase the coagulation rate of the shield grouting material, and when only two of the silica fume, the hydroxypropyl methyl cellulose and the diallyl phthalate are added, the performance of the prepared shield grouting material is not as good as that when the silica fume, the hydroxypropyl methyl cellulose and the diallyl phthalate are added simultaneously, which indicates that the silica fume, the hydroxypropyl methyl cellulose and the diallyl phthalate have synergistic effect.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (4)
1. A shield grouting material is characterized in that: the feed comprises the following raw materials in parts by weight: 80-120 parts of cement, 180-300 parts of fly ash, 200-350 parts of sand, 50-80 parts of bentonite, 2-4 parts of thickening agent, 0.5-1.5 parts of expanding agent and 0.5-3 parts of water reducing agent; the thickening agent comprises silica fume, hydroxypropyl methyl cellulose and diallyl phthalate;
the thickening agent comprises the following components in parts by weight: 5-15 parts of silica fume, 0.5-1 part of hydroxypropyl methyl cellulose and 2-4 parts of diallyl phthalate;
the expanding agent comprises the following components in parts by weight: 5-10 parts of calcium sulphoaluminate, 4-8 parts of calcium oxide and 4-6 parts of magnesium oxide;
the expanding agent also comprises 2-4 parts by weight of gypsum.
2. The shield grouting material according to claim 1, characterized in that: the shield grouting material comprises the following raw materials in parts by weight: 90-110 parts of cement, 220-280 parts of fly ash, 250-300 parts of sand, 60-70 parts of bentonite, 2.5-3.5 parts of thickening agent, 0.8-1.2 parts of expanding agent and 1-2 parts of water reducing agent.
3. The shield grouting material according to claim 1, characterized in that: the average particle size of the hydroxypropyl methyl cellulose is 80-100 meshes.
4. The shield grouting material according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
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| CN115626789B (en) * | 2022-10-20 | 2023-09-05 | 山东大学 | Low-carbon impervious grouting material for back filling of TBM tunnel lining and preparation method thereof |
| CN115504720A (en) * | 2022-10-20 | 2022-12-23 | 佛山市鲸砼科技有限公司 | Premixed shield synchronous grouting material |
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| CN101269938A (en) * | 2008-04-29 | 2008-09-24 | 武汉理工大学 | Tunnel backing cloth slip casting material capable of preventing duct piece float upward and preparation method thereof |
| JP7004519B2 (en) * | 2017-06-27 | 2022-02-10 | 宇部興産建材株式会社 | Cement composition for PC grout |
| CN107512862B (en) * | 2017-08-08 | 2020-09-04 | 中交武汉港湾工程设计研究院有限公司 | Tackifier special for shield synchronous grouting material |
| CN108558330B (en) * | 2018-05-22 | 2021-01-08 | 武汉源锦建材科技有限公司 | Micro-expansion grouting material for grouting with mold at arch crown of tunnel lining |
| CN114181578A (en) * | 2021-11-18 | 2022-03-15 | 中冶武汉冶金建筑研究院有限公司 | External wall heat-preservation and heat-insulation composite building coating and preparation method thereof |
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2022
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