CN113998945A - Micro-expansion and strong anti-permeability cement-based grouting material and preparation method thereof - Google Patents
Micro-expansion and strong anti-permeability cement-based grouting material 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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
Abstract
The invention discloses a micro-expansive and strong impervious cement-based grouting material which comprises the following components in parts by weight: 90-113 parts of a base material, 5-12 parts of a composite exciting agent and 95-125 parts of water, wherein the base material comprises the following components in parts by weight: 50-80 parts of silicate cement clinker, 5-20 parts of silica fume, 13-22 parts of calcium silicate slag, 20-45 parts of coal-fired furnace slag and 5-13 parts of bentonite; the composite excitant comprises the following components in parts by weight: 10-35 parts of solid sodium silicate, 8-30 parts of magnesium oxide and 5-19 parts of calcium sulfate. The invention also discloses a preparation method of the micro-expansive and strong impervious cement-based grouting material. The cement-based grouting material is obviously superior to P.O 42.5 cement in both single performance and comprehensive performance, particularly has higher shrinkage resistance and impermeability, is more suitable for lining impermeable treatment of underground engineering, and has the advantages of stable volume, impermeability, durability, adjustable setting time, economy, environmental protection and the like.
Description
Technical Field
The invention relates to the field of building materials, in particular to a micro-expansive and strong impervious cement-based grouting material and a preparation method thereof.
Background
At present, China has become the first major country of underground engineering construction scale in the world, and the construction requirements of urban subways, cross-sea and cross-lake tunnels and the like are still in a rapidly growing situation. But at the same time, due to the complexity of the underground environment, the safe construction and operation of the underground engineering face many challenges. Among them, the problem of water leakage in the lining of underground works is a major source of disasters affecting the safety construction and operation of underground works. Especially for public traffic engineering such as subway tunnels, cross-sea and cross-lake tunnels and the like, the water leakage problem of lining is correctly prevented and treated, and the life and property safety of the public is further concerned.
The grouting method is the most common method for preventing and treating the water leakage problem of the underground engineering lining at present, but the commonly used grouting materials such as ordinary portland cement and the like have high water seepage rate, low consolidation rate and poor stone volume stability, seriously affect the effect of the water leakage treatment engineering, often cause incomplete engineering treatment, easy disaster repetition and the like. On the other hand, the water leakage treatment engineering quantity is large, a large amount of grouting materials are required to be consumed, and the water leakage treatment is limited by factors such as practical economic benefits, so that no better grouting material is used for replacing common Portland cement at present.
According to the existing engineering experience, the material for seepage-proofing grouting filling after the lining wall of underground engineering is mainly investigated on the properties of grout injectability, shrinkage rate of a stone body, permeability coefficient, strength and the like. The traditional cement-based material has high water precipitation rate of slurry, poor stability and low compactness of a stone body, cannot fully fill the space behind the lining wall of the underground engineering, and has poor seepage-proofing and water-blocking effects. In addition, a large amount of grouting materials are needed for the post-grouting filling of the lining wall, and the existing high-grade cement-based material is used, so that the requirement on engineering economy cannot be met, and the national development concept of low carbon and environmental protection is not met. Therefore, in order to solve the above problems, the novel grouting material starts from the utilization of industrial waste residues, and the properties of the mixture meet the related requirements by adjusting the components.
In order to solve the problem of performance defects of grouting materials in underground engineering lining anti-seepage treatment engineering and improve the water leakage prevention and treatment effects, a novel grouting material with excellent performance, economy and environmental protection is urgently needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a micro-expansion and strong impervious cement-based grouting material. The grouting material has the advantages of stable volume, impermeability, durability, adjustable setting time, economy, environmental protection and the like, is suitable for preventing and treating the lining water leakage of underground engineering such as subway tunnels and the like, and can effectively solve the performance defects of the traditional ordinary Portland cement grouting material on the premise of meeting the economic benefit requirement.
The invention also provides a preparation method of the micro-expansive and strong impervious cement-based grouting material,
the purpose of the invention is realized as follows:
the invention relates to a micro-expansive strong impervious cement-based grouting material which comprises the following components in parts by weight: 90-113 parts of base material, 5-12 parts of composite exciting agent and 95-125 parts of water;
the base material comprises the following components in parts by weight: 50-80 parts of silicate cement clinker, 5-20 parts of silica fume, 13-22 parts of calcium silicate slag, 20-45 parts of coal-fired furnace slag and 5-13 parts of bentonite;
the composite excitant comprises the following components in parts by weight: 10-35 parts of solid sodium silicate, 8-30 parts of magnesium oxide and 5-19 parts of calcium sulfate.
Preferably, the micro-expansion and strong impervious cement-based grouting material comprises the following components in parts by weight: 95-110 parts of matrix material, 6-10 parts of composite excitant and 120 parts of water;
the base material comprises the following components in parts by weight: 55-70 parts of portland cement clinker, 6-15 parts of silica fume, 15-20 parts of calcium silicate slag, 25-40 parts of coal-fired furnace slag and 6-12 parts of bentonite;
the composite excitant comprises the following components in parts by weight: comprises 15-30 parts of solid sodium silicate, 10-25 parts of magnesium oxide and 6-15 parts of calcium sulfate.
Preferably, the portland cement clinker is low-heat portland cement clinker, and the weight content of dicalcium silicate in the low-heat portland cement clinker is 40-55%.
Preferably, the silica content of the silica fume is 85-95% by weight, and the specific surface area is 15m2/g-20m2/g。
Preferably, the weight content of calcium oxide in the calcium silicate slag is 45-56%.
Preferably, the coal-fired slag contains 40-55 wt% of silicon dioxide and 15-34 wt% of aluminum oxide.
Preferably, the bentonite is sodium bentonite, and the water absorption rate is 200-300%.
Preferably, the modulus of the solid sodium silicate is 3.1-3.6.
Preferably, the magnesium oxide has a purity of 80% to 100% and a calcium oxide content of 0% to 6% by weight.
Preferably, the calcium sulfate is anhydrous calcium sulfate, and the purity of the calcium sulfate is 90-100%.
The invention also provides a preparation method of the micro-expansion and strong impervious cement-based grouting material, which comprises the following steps:
(1) grinding the calcium silicate slag and the coal-fired furnace slag, and then uniformly mixing the ground calcium silicate slag and the coal-fired furnace slag with silicate cement clinker, silica fume, bentonite and the like according to a proportion to prepare a matrix material;
(2) mixing solid sodium silicate, magnesium oxide and calcium sulfate uniformly according to a proportion to prepare a composite excitant;
(3) the base material, the composite excitant and the water are mixed and stirred evenly according to the proportion to prepare the micro-expansive and strong impervious cement-based grouting material.
Portland cement clinker is used as a main cementing material, and silica fume, calcium silicate slag, coal-fired furnace slag and bentonite are used as auxiliary cementing materials. The concrete reasons for the final selection of the silica fume, the calcium silicate, the coal-fired furnace slag, the bentonite and the like as the auxiliary cementing materials are as follows:
the silica fume has smaller granularity, the specific surface area is 80-100 times of that of the cement, the active ingredient is active silica, the pozzolan activity is realized, calcium hydroxide in the cement can be consumed, and particularly, the active silica is enriched in coarse particles which are directionally arranged in an interface transition region, so that more C-S-H (calcium silicate hydrate) gel is generated. The pore structure is refined, so that the matrix is more compact, and the impermeability is improved.
The silico-calcium slag is residue which is obtained by extracting alumina from high-alumina fly ash by using an alkali lime sintering process and takes calcium silicate as a main component. The calcium oxide content of the cement-based material is about 45 percent, and the cement-based material can replace limestone to play a role to a certain extent in a mixed system and promote early hydration reaction, so that the early strength of the cement-based material is increased. In addition, under the excitation of water glass (sodium silicate), the calcium silicate slag can generate considerable C-S-H (hydrated calcium silicate) and C-A-S-H (hydrated calcium aluminosilicate) gel, and has certain gelling property.
The coal-fired slag is the slag generated during power generation by adopting coal, has the defects of more impurities and insufficient effective active ingredients, but has low price and wide source, can reduce the problem of environmental pollution caused by stacking, and has higher application value. The coal-fired furnace slag in China is huge in output amount, is a sintered volcanic ash material and has certain hydraulic gelation property, and the coal-fired furnace slag ground to a certain fineness can replace fly ash to a certain extent. The coal-fired furnace slag can reduce the later-stage retraction generated by cement clinker, so that the impermeability and durability of the grouting material are improved.
The bentonite is sodium bentonite and has good expansibility. The bentonite can adsorb other particles and form a certain framework structure in water, so that the deposition of the particles can be effectively inhibited, the stability and uniformity of slurry are improved, and the water precipitation rate is reduced. Moreover, the bentonite with proper proportion is doped, so that the problem of later-stage dry shrinkage of the stone body of the grouting material can be effectively solved, and the impermeability is improved.
The industrial waste residue materials such as calcium silicate slag, coal-fired furnace slag and the like have poor hydraulic performance, and an alkaline activator is required to be added to promote the industrial waste residue materials to hydrate so as to generate effective gelled minerals. In the aspect of catalytic effect, according to test results, the sodium silicate and the magnesium oxide show excellent exciting catalytic effect, on the basis, the early strength requirement of the grouting material is considered, the calcium sulfate is selected, the hydration reaction is accelerated, the generation amount of ettringite is increased, and the strength of the slurry concretion body is further improved. For sodium silicate, the sodium silicate has excellent exciting and catalyzing effects on the calcium silicate slag, and the exciting and catalyzing effects of liquid sodium silicate, namely water glass, are superior to those of solid sodium silicate, but the use of the liquid sodium silicate can provide special requirements for grouting equipment and grouting process, and is inconvenient for field operation. Therefore, the invention finally selects the solid sodium silicate as one of the components of the composite activator, and the novel cement-based grouting material prepared by mixing the solid sodium silicate needs to be sealed by a sealing bag before use so as to isolate moisture in the air. In the case of magnesium oxide, the early hydration reaction of the cementing material can be accelerated, and the magnesium oxide participates in the hydration reaction to generate magnesium hydroxide, hydrated magnesium silicate gel and hydrotalcite. The magnesium hydroxide has expansibility to compensate shrinkage, the hydrated magnesium silicate gel is beneficial to bonding among hydrated products, and the hydrotalcite can fill the microporous structure of the cementing material to reduce the pore diameter and inhibit the drying shrinkage of the material. The addition of magnesium sulfate is beneficial to the generation of ettringite, so that a large amount of rod-shaped ettringite is interwoven and gathered in pores, a good reinforcing effect is achieved, and the compressive strength of the material at the initial stage and the later stage of the hydration reaction is improved.
The reinforcing effect among the components of the composite excitant is that OH generated by sodium silicate in solution is fully stirred by adding water into a base material and the composite excitant-Ion and [ SiO ]4]4-Ca whose ions can be decomposed by water with the base material2+、Al3+Isoactive cationThe reaction produced C-S-H (calcium silicate hydrate) gel. Meanwhile, the magnesium oxide generates Mg (OH) when meeting water2And separating out Mg2+Ions and OH-Firstly, the pH value of the aqueous solution in the pores of the mixture is improved, and the process of hydration reaction is accelerated; secondly, the hydrotalcite-like compound takes part in hydration reaction to generate hydrotalcite-like phase (Mg)6Al(OH)16CO3·4H2O) and M-S-H (hydrated magnesium silicate), and the hydrotalcite-like compound (Ht) can further fill the internal pores of C-S-H and other gels, so that the compactness of the internal structure of the stone body of the grouting material is improved, the compressive strength of the material is further increased, and the later-stage drying shrinkage is reduced. In addition, M-S-H is more stable than C-S-H in a high-alkalinity environment, long-term stability of the stone body is guaranteed to a certain extent, and the problems of high stone body permeability, serious dehydration and shrinkage and poor long-term durability of a grouting material when sodium silicate is used as a single catalyst are solved. The calcium sulfate mainly plays an auxiliary role for adjusting the hydration reaction degree and improving the early strength of the concretion body, the addition of the calcium sulfate can promote the generation of AFt (ettringite), and the ettringite can play a retarding role to control the hydration process; secondly, the ettringite crystals can quickly form a hard framework structure in the early stage of slurry condensation, so that the early strength of a grouting material concretion body is improved; finally, the ettringite has certain expansibility, can inhibit the drying shrinkage of the calculi body, and improves the volume stability. Generally, the sodium silicate and the magnesium oxide are mainly used for promoting hydration reaction, the generation type and the content of hydration products are controlled through a proper proportion, so that various performances of the grouting material concretion body are improved, the calcium sulfate plays an auxiliary adjusting role, the early strength of the grouting material concretion body is guaranteed, the hydration process is controlled in a reasonable range, and the phenomenon that the hydration is too fast to cause drying shrinkage is prevented.
Compared with the prior art, the invention has the following beneficial effects:
the invention fully utilizes the industrial waste residue, reduces the usage amount of the portland cement, reduces the emission of carbon dioxide while preparing the seepage-proofing grouting filling material with excellent performance after the underground engineering lining wall is built, and solves the problem of environmental damage caused by stacking of the industrial waste residue.
The invention provides a composite activator for fully exerting the potential performance of industrial waste slag, can effectively accelerate the hydration and cross-linking interconnection process of cementing materials such as coal-fired furnace slag and the like, improves the compactness of hydrated concretes, and realizes the functions of resisting seepage and blocking water.
Drawings
FIG. 1a is a microscopic scanning electron microscope image of P.O 42.5 cement after hydration and consolidation. .
FIG. 1b is a microscopic scanning electron microscope (without any activator) of the cement-based grouting material prepared in example 1 after hydration and consolidation.
FIG. 1c is a microscopic scanning electron microscope (with addition of activator) of the cement-based grouting material prepared in example 1 after hydration and consolidation.
FIG. 2a is a photograph of a P.O 42.5 cement in situ application.
Fig. 2b is a photograph of a field application of the cement-based grouting material prepared in example 1.
Detailed Description
The present invention will be further described with reference to the following examples. 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.
Comparative example
In order to highlight the excellent effects of the present invention, a control example was provided using P · O42.5 cement, and the manufacturing method thereof was: weighing 100 parts of P & O42.5 cement and 100 parts of water in parts by mass, and fully stirring for ten minutes in a stirrer. The scanning electron microscope image after hydration and consolidation is shown in figure 1a, AFt (ettringite) and mineral gel are interwoven together to form a space structure of a concretion body, but the structure of the concretion body is not compact enough and has coarse pores. This indicates that the hydration product of P.O 42.5 cement is single and has uneven proportion, and cannot form compact space structure, thus seriously affecting the strength and impermeability of the stone body. The field application condition is shown in fig. 2a, and the lining structure has serious water leakage and can not meet the engineering requirement.
The characterization results of the obtained materials are shown in table 1 below.
TABLE 1 characterization of the P.O 42.5 Cement materials
Example 1
The cement-based grouting material with micro-expansion and strong impermeability comprises the following steps:
(1) respectively grinding the calcium silicate slag and the coal-fired furnace slag by adopting a ball mill to ensure that the specific surface area of the calcium silicate slag is 520-600m2The specific surface area of the slag of the coal-fired furnace is 400-2/kg；
(2) According to the mass parts, 65 parts of portland cement clinker, 10 parts of silica fume, 20 parts of calcium silicate slag, 25 parts of coal-fired furnace slag and 8 parts of bentonite are uniformly mixed to prepare a base material;
(3) grinding solid sodium silicate, magnesium oxide and calcium sulfate into powder, and uniformly mixing 20 parts of sodium silicate, 15 parts of magnesium oxide and 8 parts of calcium sulfate according to parts by weight to prepare a composite excitant;
(4) according to the mass parts, 110 parts of base material, 8 parts of composite exciting agent and 120 parts of water are placed in a stirrer to be fully stirred for 10 minutes;
(5) and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The scanning electron microscope image of the base material of the grouting material of the embodiment after hydration and consolidation (without addition of the exciting agent) is shown in fig. 1b, compared with P.O 42.5 cement, the content of AFt (ettringite) in the aggregate of the base material is obviously reduced, the amount of gel substances is increased, the structure is more compact, and the pores are smaller; in the embodiment, as shown in fig. 1c, a scanning electron microscope image of the grouting material after hydration and consolidation (with the addition of the activator) shows that compared with the base material, the grouting material has the advantages that the number and size of pores of a stone body are further reduced, and part of the pores are filled with micro-particles, so that the compactness of the stone body structure is further improved; the field application condition is shown in figure 2b, and the lining structure does not leak water, so that the engineering requirements are met.
The characterization results of the obtained materials are shown in table 2 below.
TABLE 2 characterization of the grouted materials
Example 2
The cement-based grouting material with micro-expansion and strong impermeability comprises the following steps:
(1) respectively grinding the calcium silicate slag and the coal-fired furnace slag by adopting a ball mill to ensure that the specific surface area of the calcium silicate slag is 520-600m2The specific surface area of the slag of the coal-fired furnace is 400-2/kg；
(2) According to the mass parts, 70 parts of portland cement clinker, 15 parts of silica fume, 15 parts of calcium silicate slag, 40 parts of coal-fired furnace slag and 12 parts of bentonite are uniformly mixed to prepare a base material;
(3) grinding solid sodium silicate, magnesium oxide and calcium sulfate into powder, and uniformly mixing 30 parts of sodium silicate, 15 parts of magnesium oxide and 15 parts of calcium sulfate according to parts by weight to prepare a composite excitant;
(4) according to the mass parts, 110 parts of base material, 10 parts of composite excitant and 120 parts of water are placed in a stirrer to be fully stirred for 10 minutes;
(5) and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The characterization results of the obtained materials are shown in table 3 below.
TABLE 3 characterization of the grouted materials
Example 3
The cement-based grouting material with micro-expansion and strong impermeability comprises the following steps:
(1) respectively grinding the calcium silicate slag and the coal-fired furnace slag by adopting a ball mill to ensure that the specific surface area of the calcium silicate slag is 520-600m2The specific surface area of the slag of the coal-fired furnace is 400-2/kg；
(2) According to the mass parts, 55 parts of portland cement clinker, 15 parts of silica fume, 20 parts of calcium silicate slag, 30 parts of coal-fired furnace slag and 8 parts of bentonite are uniformly mixed to prepare a base material;
(3) grinding solid sodium silicate, magnesium oxide and calcium sulfate into powder, and uniformly mixing 25 parts of sodium silicate, 15 parts of magnesium oxide and 10 parts of calcium sulfate according to parts by weight to prepare a composite excitant;
(4) putting 100 parts of base material, 8 parts of composite exciting agent and 100 parts of water in a stirrer and fully stirring for 10 minutes;
(5) and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The characterization results of the obtained materials are shown in table 4 below.
TABLE 4 characterization of the grouted materials
Example 4
The cement-based grouting material with micro-expansion and strong impermeability comprises the following steps:
(1) respectively grinding the calcium silicate slag and the coal-fired furnace slag by adopting a ball mill to ensure that the specific surface area of the calcium silicate slag is 520-600m2The specific surface area of the slag of the coal-fired furnace is 400-2/kg；
(2) According to the mass parts, 65 parts of portland cement clinker, 6 parts of silica fume, 20 parts of calcium silicate slag, 25 parts of coal-fired furnace slag and 8 parts of bentonite are uniformly mixed to prepare a base material;
(3) grinding solid sodium silicate, magnesium oxide and calcium sulfate into powder, and uniformly mixing 30 parts of sodium silicate, 10 parts of magnesium oxide and 6 parts of calcium sulfate according to parts by weight to prepare a composite excitant;
(4) according to the mass parts, 95 parts of base material, 10 parts of composite excitant and 100 parts of water are placed in a stirrer to be fully stirred for 10 minutes;
(5) and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The characterization results of the obtained materials are shown in table 5 below.
TABLE 5 characterization of the grouted materials
After the concrete is cured for 28 days in the environment with the humidity of 90% and the temperature of 25 ℃ in each example and comparative example, the test data of the compressive strength, the shrinkage rate and the permeability coefficient of the concrete show that the cement-based grouting material is obviously superior to P.O 42.5 cement in both single performance and comprehensive performance, especially has higher shrinkage resistance and permeability resistance, and is more suitable for the lining seepage-proofing treatment of underground engineering.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (5)
1. The cement-based grouting material with micro-expansion and strong impermeability is characterized by comprising the following components in parts by weight: 90-113 parts of base material, 5-12 parts of composite exciting agent and 95-125 parts of water;
the base material comprises the following components in parts by weight: 50-80 parts of silicate cement clinker, 5-20 parts of silica fume, 13-22 parts of calcium silicate slag, 20-45 parts of coal-fired furnace slag and 5-13 parts of bentonite;
the composite excitant comprises the following components in parts by weight: 10-35 parts of solid sodium silicate, 8-30 parts of magnesium oxide and 5-19 parts of calcium sulfate.
2. The cement-based grouting material as claimed in claim 1, characterized by comprising the following components in parts by weight: 95-110 parts of matrix material, 6-10 parts of composite excitant and 120 parts of water;
the base material comprises the following components in parts by weight: 55-70 parts of portland cement clinker, 6-15 parts of silica fume, 15-20 parts of calcium silicate slag, 25-40 parts of coal-fired furnace slag and 6-12 parts of bentonite;
the composite excitant comprises the following components in parts by weight: comprises 15-30 parts of solid sodium silicate, 10-25 parts of magnesium oxide and 6-15 parts of calcium sulfate.
3. The cement-based grouting material as claimed in claim 1 or claim 2, characterized in that:
in the matrix material, the portland cement clinker is low-heat portland cement clinker, and the weight content of dicalcium silicate in the low-heat portland cement clinker is 40-55%;
the weight content of silicon dioxide in the silica fume is 85-95%, and the specific surface area is 15m2/g-20m2/g；
The weight content of calcium oxide in the calcium silicate slag is 45-56%;
the coal-fired slag contains 40-55% of silicon dioxide and 15-34% of alumina by weight;
the bentonite is sodium bentonite, and the water absorption rate is 200-300%.
4. The cement-based grouting material as claimed in claim 1 or claim 2, characterized in that:
in the compound excitant, the modulus of the solid sodium silicate is 3.1-3.6;
the purity of the magnesium oxide is 80-100%, and the weight content of calcium oxide in the magnesium oxide is 0-6%;
the calcium sulfate is anhydrous calcium sulfate, and the purity of the calcium sulfate is 90-100%.
5. A method of preparing a cement-based grouting material as claimed in claim 1, characterized by comprising the steps of:
(1) grinding the calcium silicate slag and the coal-fired furnace slag, and then uniformly mixing the ground calcium silicate slag and the coal-fired furnace slag with silicate cement clinker, silica fume, bentonite and the like according to a proportion to prepare a matrix material;
(2) mixing solid sodium silicate, magnesium oxide and calcium sulfate uniformly according to a proportion to prepare a composite excitant;
(3) the base material, the composite excitant and the water are mixed and stirred evenly according to the proportion to prepare the micro-expansive and strong impervious cement-based grouting material.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115626789A (en) * | 2022-10-20 | 2023-01-20 | 山东大学 | Low-carbon anti-permeability grouting material for filling back of TBM tunnel lining and preparation method thereof |
| 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 |
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