CN113754362A - Shield grouting material and preparation method thereof - Google Patents
Shield grouting material and preparation method thereof Download PDFInfo
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- CN113754362A CN113754362A CN202111004968.8A CN202111004968A CN113754362A CN 113754362 A CN113754362 A CN 113754362A CN 202111004968 A CN202111004968 A CN 202111004968A CN 113754362 A CN113754362 A CN 113754362A
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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
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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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- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a grouting material, and discloses a shield grouting material, which comprises cement, high-calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent, wherein the shield grouting material comprises 3-7 parts by weight of high-calcium fly ash, 1-2.5 parts by weight of fine sand, 0.1-0.8 part by weight of bentonite, 0.2-1 part by weight of metakaolin, 1-1.5 parts by weight of iron tailings, 0.1-0.4 part by weight of the alkaline activator and 0.003-0.05 part by weight of the water reducing agent, wherein the weight part of the cement is taken as unit 1. In addition, the invention also discloses a preparation method of the shield grouting material. The shield grouting material has high consolidation rate, high extraction rate and good construction effect.
Description
Technical Field
The invention relates to a grouting material, in particular to a shield grouting material. In addition, the invention also relates to a preparation method of the shield grouting material.
Background
With the continuous development of domestic and foreign building industries, the construction of large-scale cross-river and sea tunnels is increasing, and shield construction also faces a serious challenge in the construction process of the cross-river and sea tunnels.
In the shield construction process, the difference between the diameter of a cutter head of a shield machine and the outer diameter of a segment is 20cm, so that an annular gap is formed between the segment and a soil body after the segment is assembled and separated from a shield tail, and if the gap is not filled in time, stratum deformation can be caused, so that the ground surface sinks or buildings sink. Therefore, in the shield construction process, synchronous grouting operation needs to be carried out, and grout is injected into a construction gap, so that formation deformation can be effectively inhibited, the segments can be more stable, the segments are prevented from being deviated, and when underground water is rich, a shield tail water source is prevented from flowing into a tunnel face to cause gushing, and the anti-permeability of a tunnel is improved. However, the actual yield of the existing shield grouting material after filling is low, and the solidification rate after solidification is not high, so that unsaturated filling is caused, and ground settlement is large. In the shield construction process, secondary slurry supplement is often required according to the actual square rate and the consolidation rate, so that the construction cost is increased, and the risk control difficulty in the secondary slurry supplement process is higher.
Therefore, it is desirable to provide a shield grouting material which can overcome the above technical problems and effectively solve or alleviate the above technical problems.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a shield grouting material, which has high consolidation rate, high emergence rate and good construction effect.
In addition, the technical problem to be solved by the aspect of the invention is to provide a preparation method of the shield grouting material, and the preparation method of the shield grouting material is convenient to operate and good in product construction effect.
In order to achieve the above object, the present invention provides a shield grouting material, including cement, high calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator, and a water reducing agent, wherein the shield grouting material contains, by weight, 3 to 7 parts of high calcium fly ash, 1 to 2.5 parts of fine sand, 0.1 to 0.8 part of bentonite, 0.2 to 1 part of metakaolin, 1 to 1.5 parts of iron tailings, 0.1 to 0.4 part of alkaline activator, and 0.003 to 0.05 part of water reducing agent, based on 1 part of the cement.
As a preferred embodiment of the invention, the shield grouting material comprises 4-6 parts by weight of high-calcium fly ash, 1.4-2.1 parts by weight of fine sand, 0.2-0.6 part by weight of bentonite, 0.3-0.8 part by weight of metakaolin, 1.1-1.4 parts by weight of iron tailings, 0.15-0.3 part by weight of alkaline activator and 0.005-0.03 part by weight of water reducer, based on 1 part by weight of cement.
As another preferred embodiment of the present invention, the particle size distribution of the iron tailings is not less than 90% at 10-60 μm.
Preferably, the metakaolin has a particle size distribution of not less than 80% from 0.5 to 40 μm.
As still another preferred embodiment of the present invention, the fine sand is fine sand having a particle size of less than 40 mesh.
In addition, the invention also provides a preparation method of the shield grouting material, which comprises the following steps: mixing cement, high-calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent to obtain the shield grouting material;
the cement is characterized in that the cement is calculated by taking the weight part of the cement as unit 1, the using amount of the high-calcium fly ash is 3-7 parts by weight, the using amount of the fine sand is 1-2.5 parts by weight, the using amount of the bentonite is 0.1-0.8 part by weight, the using amount of the metakaolin is 0.2-1 part by weight, the using amount of the iron tailings is 1-1.5 parts by weight, the using amount of the alkaline activator is 0.1-0.4 part by weight, and the using amount of the water reducing agent is 0.003-0.05 part by weight.
Preferably, the weight part of the cement is 1, the amount of the high-calcium fly ash is 4-6, the amount of the fine sand is 1.4-2.1, the amount of the bentonite is 0.2-0.6, the amount of the metakaolin is 0.3-0.8, the amount of the iron tailings is 1.1-1.4, the amount of the alkaline activator is 0.15-0.3, and the amount of the water reducing agent is 0.003-0.05.
More preferably, the particle size distribution of the iron tailings is not less than 90% in the range of 10-60 μm.
Furthermore, the particle size distribution of the metakaolin is not less than 80% in the range of 0.5-40 μm.
Specifically, the fine sand is fine sand of less than 40 mesh.
Through the technical scheme, the invention has the beneficial effects that:
the iron tailings can be formed into a geopolymer cementing material under the action of the alkaline activator, the use amount of cement can be effectively reduced, the economic benefit is increased, the iron tailings are secondarily utilized, the economic burden of iron tailing treatment can be effectively reduced, the pollution to the environment is reduced, and good economic benefit and environmental benefit can be generated. Meanwhile, the high-calcium fly ash and metakaolin are added in the shield grouting material as admixtures, so that the slurry in the construction process has good fluidity, the volume weight of the slurry is reduced, and the extraction rate is improved. The bentonite of the invention can improve the water retention rate of the slurry in the construction process, slow down the material separation of the slurry, improve the suspension performance of the aggregate, reduce the bleeding rate and further effectively improve the consolidation rate of the slurry.
Further advantages of the present invention, as well as the technical effects of preferred embodiments, are further described in the following detailed description.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As described above, the first aspect of the present invention provides a shield grouting material, which comprises cement, high calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent, wherein the shield grouting material comprises, by weight, 3 to 7 parts of high calcium fly ash, 1 to 2.5 parts of fine sand, 0.1 to 0.8 part of bentonite, 0.2 to 1 part of metakaolin, 1 to 1.5 parts of iron tailings, 0.1 to 0.4 part of alkaline activator and 0.003 to 0.05 part of water reducing agent, based on 1 part of the cement.
The shield grouting material provided by the invention takes cement as a gel material, so that the strength of the slurry after solidification can be ensured; the high-calcium fly ash and the metakaolin are used as admixture, so that the good fluidity of the slurry can be ensured, the volume weight of the slurry is reduced, and the extraction rate is improved; the bentonite can improve the water retention rate of the slurry, slow down the material separation of the slurry, improve the suspension performance of the aggregate, reduce the bleeding rate and improve the consolidation rate; the iron tailings and the alkaline activator act together to form geopolymer cementing material, so that the use amount of cement is reduced.
The slurry is prepared by mixing the shield grouting material of the invention with a certain proportion of water.
Specifically, as shown in table 1, the high calcium fly ash used in the present invention has the following five advantages compared to the common fly ash: firstly, the characteristic of small volume weight of high-calcium fly ash is utilized: compared with the common fly ash, the high-calcium fly ash has smaller volume weight which is about 650-700Kg/m3The volume weight of the premixed shield grouting material is about 20 percent lower than that of the common fly ash, the fly ash with the same proportion is doped into a single-ton premixed shield grouting material, the high-calcium fly ash is used, the formulation rate of the premixed shield grouting material can be obviously improved, and the workability of the slurry added with water in the construction and conveying stage is greatly improved, the grouting pressure is reduced, and the grouting speed is also improved due to the small volume weight of the high-calcium fly ash. Secondly, by utilizing the glass bead characteristics of the high-calcium fly ash particles: the particle size of the high-calcium fly ash is smaller than that of the common fly ash, and the particles of the high-calcium fly ash are in a glass bead shape, complete in particle shape, smooth in surface and compact in texture, so that the slurry can play a water reducing effect, a lubricating effect and a homogenizing effect, the flocculation decomposing effect of initial cement hydration is promoted, the rheological property, the initial structure and multiple functions after hardening of a mixture are changed, and particularly, the high-calcium fly ash can play a good lubricating effect during conveying and grouting. Thirdly, the volcanic ash activity effect of the high-calcium fly ash is utilized: the high-calcium fly ash contains a certain amount of calcium-rich vitreous body and a small amount of minerals such as calcium aluminate or calcium silicate besides more free calcium oxide, so that the high-calcium fly ash has certain self-hardening property, and the chemical components in the high-calcium fly ash contain a large amount of active SiO2And Al2O3In a moist environment with Ca (OH)2And the alkaline substances are subjected to chemical reaction to generate gelled substances such as calcium silicate hydrate and calcium aluminate hydrate, so that the strength of the slurry after hardening is higher. Fourthly, high calcium powder is utilizedMicroaggregate effect of coal ash: the micro-beads and detritus with small particle size in the high-calcium fly ash are equivalent to unhydrated cement particles in the slurry, and the superfine high-calcium fly ash particles are equivalent to active nano materials, so that the structural strength of the slurry can be obviously improved and enhanced, and the homogeneity and compactness are improved. Fifthly, utilizing the micro-expansion effect of the high-calcium fly ash: the high-calcium fly ash has high activity, which is incomparable with the common fly ash. However, because the high calcium ash has a certain amount of free calcium oxide, when the high calcium ash is used as a cement admixture or concrete, the high calcium ash has a certain micro-expansibility, and the stability of a cement product hardened by adding water is not qualified, so the high calcium ash cannot be used in a common cement product, and in a shield grouting material proportioning system, because the requirements on the fluidity and the workability of the slurry after adding water are higher, but the requirements on the strength are lower, and the strength of the slurry after adding water is generally higher than 2.5MPa in 28 days. Therefore, the ultra-large water-to-cement ratio is used in the shield grouting material proportioning system, the water adding amount of a single ton of dry powder shield grouting material reaches 650 kilograms, so a large amount of free water gaps are formed in the grouting material structure, free calcium oxide in the high-calcium fly ash is easy to hydrate, and the expansion effect generated in the early stage of hydration of mixed cement in the grouting material system with low cement content is just fused with the slurry with a porous structure, so that the hardened slurry is not shrunk, the consolidation rate of the grouting material is greatly improved, compared with the slurry doped with common fly ash, the consolidation rate of the slurry doped with the high-calcium fly ash is improved by about 15%, and the micro-expansion effect of the high-calcium fly ash is well utilized by combining the use characteristics of the grouting material. In a word, the invention utilizes the characteristics of low silicate ion polymerization degree in the high-calcium fly ash, higher volcanic ash activity, tiny particles and low volume weight compared with the common low-calcium fly ash, and the high-calcium fly ash used as the pre-mixed shield grouting material admixture has the characteristics of water reduction, early strength, improvement of the extraction rate, improvement of the consolidation rate, micro-expansion and the like, improves the technical index of the shield grouting material while absorbing the high-calcium fly ash, and reduces the production cost.
TABLE 1 comparison of the Properties of high calcium fly ash and ordinary fly ash
Preferably, the shield grouting material comprises, by weight, 4-6 parts of high-calcium fly ash, 1.4-2.1 parts of fine sand, 0.2-0.6 part of bentonite, 0.3-0.8 part of metakaolin, 1.1-1.4 parts of iron tailings, 0.15-0.3 part of alkaline activator and 0.005-0.03 part of water reducer, based on 1 part of cement.
More preferably, the particle size distribution of the iron tailings is not less than 90% in the range of 10-60 μm.
Furthermore, the particle size distribution of the metakaolin is not less than 80% in the range of 0.5-40 μm.
It should be noted that the maximum particle size of the grouting material aggregate of the invention is less than 0.6mm, that is, the particle size is less than 50 meshes.
Further, the fine sand is less than 40 mesh fine sand.
In addition, the second aspect of the invention also provides a preparation method of the shield grouting material, which comprises the following steps:
mixing cement, high-calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent to obtain the shield grouting material;
the cement is characterized in that the cement is calculated by taking the weight part of the cement as unit 1, the using amount of the high-calcium fly ash is 3-7 parts by weight, the using amount of the fine sand is 1-2.5 parts by weight, the using amount of the bentonite is 0.1-0.8 part by weight, the using amount of the metakaolin is 0.2-1 part by weight, the using amount of the iron tailings is 1-1.5 parts by weight, the using amount of the alkaline activator is 0.1-0.4 part by weight, and the using amount of the water reducing agent is 0.003-0.05 part by weight.
In the invention, the high-calcium fly ash, the fine sand bentonite and the metakaolin are required to be sieved before mixing, whether the iron tailings are required to be ground or not is selected according to actual conditions before mixing, and the grinded iron tailings are sieved.
Preferably, the weight part of the cement is 1, the amount of the high-calcium fly ash is 4-6, the amount of the fine sand is 1.4-2.1, the amount of the bentonite is 0.2-0.6, the amount of the metakaolin is 0.3-0.8, the amount of the iron tailings is 1.1-1.4, the amount of the alkaline activator is 0.15-0.3, and the amount of the water reducing agent is 0.003-0.05.
Preferably, the particle size distribution of the iron tailings is not less than 90% in a range of 10-60 μm.
Preferably, the metakaolin has a particle size distribution of not less than 80% from 0.5 to 40 μm.
Preferably, the fine sand is less than 40 mesh fine sand.
The present invention will be described in detail below by way of examples, wherein 1 part by weight of the composition is 100 Kg. In the present invention, the alkali activator comprises: 50-80 wt% of calcium oxide and 10-20 wt% of sodium hydroxide; the water reducing agent is a polycarboxylic acid water reducing agent, preferably the polycarboxylic acid water reducing agent is a comprehensive reduction type polycarboxylic acid water reducing agent.
Example 1
(1) Mixing 1 part by weight of cement, 3 parts by weight of high-calcium fly ash, 1.4 parts by weight of fine sand, 0.1 part by weight of bentonite, 0.2 part by weight of metakaolin, 1.1 part by weight of iron tailings, 0.1 part by weight of alkaline activator and 0.003 part by weight of water reducing agent to prepare a mixture, wherein the 0.1 part by weight of alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention are measured as shown in table 2.
Table 2 material properties of example 1
Example 2
(1) Mixing 1 part by weight of cement, 3.8 parts by weight of high-calcium fly ash, 1.85 parts by weight of fine sand, 0.45 part by weight of bentonite, 0.6 part by weight of metakaolin, 1.25 parts by weight of iron tailings, 0.25 part by weight of alkaline activator and 0.026 part by weight of water reducer to prepare a mixture, wherein the 0.1 part by weight of alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducer is a polycarboxylic acid water reducer.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention were measured as shown in table 3.
Table 3 material properties of example 2
| Item | High calcium flyash-doped slip casting material |
| Percentage of evolution (%) | 99.8％ |
| Consolidation Rate (%) | 97.9％ |
| Workability | Without layered precipitation |
| 2 day compressive strength (MPa) | 0.38 |
Example 3
(1) Mixing 1 part by weight of cement, 6 parts by weight of high-calcium fly ash, 2 parts by weight of fine sand, 0.8 part by weight of bentonite, 1 part by weight of metakaolin, 1.5 parts by weight of iron tailings, 0.4 part by weight of alkaline activator and 0.05 part by weight of water reducing agent to prepare a mixture, wherein the 0.1 part by weight of alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention were measured as shown in table 4.
Table 4 material properties of example 3
| Item | High calcium flyash-doped slip casting material |
| Percentage of evolution (%) | 104％ |
| Consolidation Rate (%) | 99％ |
| Workability | Without layered precipitation |
Example 4
(1) Mixing 1 part by weight of cement, 4 parts by weight of high-calcium fly ash, 1.5 parts by weight of fine sand, 0.2 part by weight of bentonite, 0.3 part by weight of metakaolin, 1.1 parts by weight of iron tailings, 0.15 part by weight of alkaline activator and 0.005 part by weight of water reducing agent to prepare a mixture, wherein the 0.1 part by weight of alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention were measured as shown in table 5.
Table 5 material properties of example 4
Example 5
(1) Mixing 1 part by weight of cement, 5.2 parts by weight of high-calcium fly ash, 2.5 parts by weight of fine sand, 0.6 part by weight of bentonite, 0.8 part by weight of metakaolin, 1.4 parts by weight of iron tailings, 0.3 part by weight of alkaline activator and 0.03 part by weight of water reducing agent to prepare a mixture, wherein the 0.1 part by weight of alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention were measured as shown in table 6.
Table 6 material properties of example 5
| Item | High calcium flyash-doped slip casting material |
| Percentage of evolution (%) | 104.4％ |
| Consolidation Rate (%) | 99.1％ |
| Workability | Without layered precipitation |
| 2 day compressive strength (MPa) | 0.47 |
From examples 3 and 5, it can be seen that when the weight ratio of cement to high calcium fly ash is controlled to be 1: between 5 and 5.5, the grouting material has better squareness ratio and consolidation ratio. And the yield and the consolidation rate of the grouting material are improved along with the increase of the amount of the high-calcium fly ash, and the yield and the consolidation rate are higher when the weight ratio of the high-calcium fly ash reaches 4-6.
As can be seen from examples 1 to 5, the high calcium fly ash is about 4 to 6, and the total of the parts by weight of the fine sand and the iron tailings is 2.5 to 3.5.
Comparative example 1
(1) Mixing 1 part by weight of cement, 3 parts by weight of common fly ash, 1.2 parts by weight of fine sand, 0.1 part by weight of bentonite, 0.2 part by weight of metakaolin, 1 part by weight of iron tailings, 0.1 part by weight of an alkaline activator and 0.003 part by weight of a water reducing agent to prepare a mixture, wherein the 0.1 part by weight of the alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties were measured as shown in Table 7.
TABLE 7 Material characteristics of comparative example 1
| Item | Grouting material mixed with common fly ash |
| Percentage of evolution (%) | 82.6％ |
| Consolidation Rate (%) | 85.1％ |
| Workability | With layered precipitation |
| 2 day compressive strength (MPa) | 0.3 |
As can be seen from the comparison between the comparative example 1 and the example 1, the high-calcium fly ash can obviously improve the yield of the grouting material.
Comparative example 2
(1) Mixing 0.8 weight part of cement, 3 weight parts of high-calcium fly ash, 1.2 weight parts of fine sand, 0.1 weight part of bentonite, 0.2 weight part of metakaolin, 1.3 weight parts of iron tailings, 0.1 weight part of alkaline activator and 0.003 weight part of water reducing agent to prepare a mixture, wherein the 0.1 weight part of alkaline activator is 0.08 weight part of calcium oxide and 0.02 weight part of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The measured properties are shown in Table 8.
Table 8 material properties of comparative example 2
| Item | Slip casting material of comparative example 2 |
| Percentage of evolution (%) | 98.2％ |
| Consolidation Rate (%) | 96.6％ |
| Workability | Without layered precipitation |
| 2 day compressive strength (MPa) | 0.33 |
Therefore, it can be seen that when the amount of the iron tailings is increased by a small amount and the amount of the cement is reduced at the same time, various characteristics of the slurry are not changed.
Comparative example 3
(1) Mixing 1 part by weight of cement, 3 parts by weight of high-calcium fly ash, 1.2 parts by weight of fine sand, 0.2 part by weight of metakaolin, 1 part by weight of iron tailings, 0.1 part by weight of an alkaline activator and 0.003 part by weight of a water reducing agent to prepare a mixture, wherein the 0.1 part by weight of the alkaline activator is 0.08 part by weight of calcium oxide and 0.02 part by weight of sodium hydroxide, and the water reducing agent is a polycarboxylic acid water reducing agent.
(2) Water was added to the mixture in step (1) in an amount of 650kg/t to prepare a slurry.
(3) The stirred slurry was poured into a measuring device and allowed to solidify.
The properties of the slurry prepared from the shield grouting material of the present invention were measured as shown in table 9.
TABLE 9 Material characteristics of comparative example 3
| Item | High calcium flyash-doped slip casting material |
| Percentage of evolution (%) | 98.2％ |
| Consolidation Rate (%) | 86.8％ |
| Workability | Without layered precipitation |
| 2 day compressive strength (MPa) | 0.33 |
As can be seen from the comparison between comparative example 3 and example 1, the addition of bentonite can improve the consolidation rate of the grouting material.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The shield grouting material is characterized by comprising cement, high-calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent, wherein the weight of the cement is 1, and the shield grouting material contains 3-7 parts by weight of the high-calcium fly ash, 1-2.5 parts by weight of the fine sand, 0.1-0.8 part by weight of the bentonite, 0.2-1 part by weight of the metakaolin, 1-1.5 parts by weight of the iron tailings, 0.1-0.4 part by weight of the alkaline activator and 0.003-0.05 part by weight of the water reducing agent.
2. The shield grouting material according to claim 1, wherein the shield grouting material comprises, based on 1 part by weight of the cement, 4 to 6 parts by weight of high calcium fly ash, 1.4 to 2.1 parts by weight of fine sand, 0.2 to 0.6 part by weight of bentonite, 0.3 to 0.8 part by weight of metakaolin, 1.1 to 1.4 parts by weight of iron tailings, 0.15 to 0.3 part by weight of an alkaline activator, and 0.005 to 0.03 part by weight of a water reducing agent.
3. A shield grouting material according to claim 1 or 2, characterised in that the particle size distribution of the iron tailings is not less than 90% in the range of 10-60 μm.
4. A shield grouting material according to claim 1 or 2, characterised in that the metakaolin has a particle size distribution of not less than 80% in the range 0.5-40 μm.
5. A shield grouting material according to claim 1 or 2, characterised in that the fine sand has a particle size of less than 40 mesh.
6. The preparation method of the shield grouting material is characterized by comprising the following steps of:
mixing cement, high-calcium fly ash, fine sand, bentonite, metakaolin, iron tailings, an alkaline activator and a water reducing agent to obtain the shield grouting material;
the cement is characterized in that the cement is calculated by taking the weight part of the cement as unit 1, the using amount of the high-calcium fly ash is 4-6 parts by weight, the using amount of the fine sand is 1-2.5 parts by weight, the using amount of the bentonite is 0.1-0.8 part by weight, the using amount of the metakaolin is 0.2-1 part by weight, the using amount of the iron tailings is 1-1.5 parts by weight, the using amount of the alkaline activator is 0.1-0.4 part by weight, and the using amount of the water reducing agent is 0.003-0.05 part by weight.
7. The preparation method of the shield grouting material according to claim 6, characterized in that based on 1 part by weight of the cement, the high-calcium fly ash is used in an amount of 4-6 parts by weight, the fine sand is used in an amount of 1.4-2.1 parts by weight, the bentonite is used in an amount of 0.2-0.6 part by weight, the metakaolin is used in an amount of 0.3-0.8 part by weight, the iron tailings are used in an amount of 1.1-1.4 parts by weight, the alkaline activator is used in an amount of 0.15-0.3 part by weight, and the water reducer is used in an amount of 0.003-0.05 part by weight.
8. The method for preparing a shield grouting material according to claim 6 or 7, wherein the particle size distribution of the iron tailings is not less than 90% in a range of 10-60 μm.
9. The method for preparing a shield grouting material according to claim 6 or 7, characterized in that the metakaolin has a particle size distribution of not less than 80% in the range of 0.5-40 μm.
10. The method for preparing a shield grouting material according to claim 6 or 7, characterized in that the fine sand is fine sand with a particle size of less than 40 meshes.
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| CN114230224A (en) * | 2021-12-21 | 2022-03-25 | 青岛市地铁六号线有限公司 | Low-carbon anti-permeability type full-solid waste grouting material and preparation method and application thereof |
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