CN110627445B - High-impermeability cement-based repair material for tunnel engineering and preparation method thereof - Google Patents
High-impermeability cement-based repair material for tunnel engineering 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
- C04B2111/00474—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
- C04B2111/20—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
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a high-impermeability cement-based repair material for tunnel engineering. The invention has the characteristics of easy construction, good workability, good water retention, high compressive strength, high anti-permeability grade, high toughness, good caking property, good durability and the like; the product of the invention can be suitable for the construction initial protection of lining concrete in tunnel engineering or the later maintenance and repair of engineering.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-impermeability cement-based repair material for tunnel engineering and a preparation method thereof.
Background
At present, the economic development of various parts of China is unbalanced, the infrastructure construction of the Chinese and western parts is lagged, and the local economic development and the improvement of the living standard of people are severely restricted; china has complex terrain, and more than two thirds of the land is hills and mountainous areas. In recent years, China continuously and vigorously promotes the development of highways and railways in the Chinese and western regions to gradually reduce the development gap between east, middle and west, and the construction of highways and railways in certain mountainous and hilly areas in China is increasingly large in scale and more in quantity; the bridge and the tunnel account for a large proportion of highways and railways in mountainous and heavy hill areas, and the construction of tunnel engineering shows the construction in front of the scale. Due to the corrosion effects of dry-wet alternation, sunlight solarization, freeze thawing, moist air and the like, a porous corrosion surface is gradually formed on the concrete surface of the tunnel, a corrosion medium further permeates into the concrete through fine gaps on the concrete surface, so that reinforcing steel bars inside a reinforced concrete structure are corroded, and further cracking and water leakage of the tunnel lining are caused. According to incomplete statistics, in about 5000 operating railway tunnels of the rest of the operating railway tunnels in China, 65.7 percent of the tunnels account for various diseases, such as water leakage, broken lining and the like. The leakage water is one of the most common diseases of the tunnel, the damage is more serious, and in cold regions, repeated freeze-thaw damage is often caused to structural concrete, so that the structural safety of the tunnel is endangered; in a corrosion area, the steel rail is corroded and degraded by corrosion and lining concrete, and the electric leakage and power failure accidents of the electrified railway are caused; in the highway tunnel, the seepage water still can make the road surface wet and smooth, threaten driving safety, increases the interior humidity of hole, reduces the work efficiency of fan and lamps and lanterns to worsen the operation environment in tunnel. Therefore, the leakage water of the lining is a great hidden trouble of the quality safety of the tunnel engineering and is a problem which needs to be solved urgently at present.
The tunnel lining concrete and the waterproof board are two main waterproof measures in tunnel engineering. The commonly used waterproof boards often have the problems of insufficient flexibility, hollowness, irreparable fracture and aging during construction, and the like, so that the waterproof failure phenomenon is very easy to occur. Therefore, the waterproof performance of the tunnel lining concrete is more critical, and the insufficient self-waterproof capability of the lining concrete is the root of the water leakage of the current tunnel engineering.
The application number is CN201210239850.8, the invention name is composite lightweight concrete for improving a pore structure and strength and a preparation method thereof, and discloses composite lightweight concrete prepared from portland cement, fly ash, slag powder, steel slag powder, desulfurized gypsum, sodium dodecyl sulfate, a polycarboxylic acid water reducing agent, shale ceramic sand, silt ceramic particles, quartz sand, a rosin air entraining agent, triethanolamine and water, wherein the composite lightweight concrete has the advantages of low compressive strength and poor waterproof effect.
Therefore, the cement-based protective repair material has poor waterproof performance, unsatisfactory compressive strength, low permeation resistance, poor toughness, easy cracking and damage and the like, which are the technical problems to be solved at present.
Disclosure of Invention
The invention aims to provide a high-impermeability cement-based repair material for tunnel engineering and a preparation method thereof, and aims to solve the technical problems of poor waterproof performance, low permeation pressure resistance, unsatisfactory compression and tensile strength and insufficient toughness of protective repair linings in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
designing a high-impermeability cement-based repair material for tunnel engineering, which is composed of the following raw materials in parts by weight: 100 parts of portland cement, 10-40 parts of fly ash, 5-20 parts of silica fume, 5-30 parts of steel slag powder, 5-20 parts of rock powder, 20-50 parts of tailing sand, 50-300 parts of quartz sand, 2-10 parts of attapulgite, 10-80 parts of acrylate emulsion, 0.1-1.0 part of cellulose ether, 0.1-1.0 part of polyacrylamide, 0.5-3.0 parts of PVA fiber, 0.6-2.8 parts of PET fiber, 1.0-2.5 parts of polycarboxylic water reducer, 0.8-2.8 parts of defoamer and 25-50 parts of water.
Preferably, the feed consists of the following raw materials in parts by weight: 100 parts of portland cement, 15-30 parts of fly ash, 8-15 parts of silica fume, 6-12 parts of steel slag powder, 5-15 parts of rock powder, 25-40 parts of tailing sand, 100-250 parts of quartz sand, 2-8 parts of attapulgite, 10-70 parts of acrylate emulsion, 0.1-0.6 part of cellulose ether, 0.2-0.8 part of polyacrylamide, 0.5-2.5 parts of PVA fiber, 0.6-2.5 parts of PET fiber, 1.2-2.5 parts of polycarboxylic water reducer, 1.0-2.5 parts of defoamer and 25-40 parts of water.
Preferably, the portland cement is 52.5-grade ordinary portland cement; the fly ash is I-grade high-calcium fly ash, the content of free calcium oxide is not more than 3.0 percent, and the loss on ignition is not more than percent; the silicon ash is a byproduct of ferroalloy in the process of smelting ferrosilicon and industrial silicon, namely SiO2The content is at least 92.5 percent, and the average grain diameter is 0.1-0.3 um; the steel slag powder is prepared by levigating steel slag subjected to hot stuffiness or carbonization treatment, the alkalinity coefficient of the steel slag powder is at least 1.6, and the specific surface area of the steel slag powder is 450m2/Kg。
Preferably, the rock powder is granite rock powder, the particle size range is 5-120 um, and the average particle size is 30.2 um; the tailing sand is phosphorus tailing sand, the granularity range is 0.04-0.6 mm, and the granularity is less than 0.075mm and not less than 70% by weight.
Preferably, the quartz sand is prepared from 10-60-mesh and 120-150-mesh quartz sand according to the mass ratio of 6: 4.
Preferably, the fineness of the attapulgite is 200-300 meshes; the cellulose ether is hydroxypropyl methyl cellulose ether with viscosity of 40000 Pa.s.
Preferably, the solid content of the acrylate emulsion is 10-70%; the molecular weight of the polyacrylamide is 1500 ten thousand, and the solid content is more than 90%; the polycarboxylic acid water reducing agent is powder with a water reducing rate of at least 25%.
Preferably, the PVA fiber is a polypropylene alcohol fiber with the diameter of 12-14 mu m and the length of 6-12 mm; the PET fibers are polyester fibers with the diameter of 16-20 mu m and the length of 6-12 mm.
Preferably, the defoaming agent is silicone series defoaming powder.
A preparation method of a high-impermeability cement-based repair material for tunnel engineering comprises the following steps:
(1) taking the raw materials in the proportion, and uniformly mixing portland cement, fly ash, silica fume, steel slag powder, rock powder, attapulgite, PVA fiber and PET fiber;
(2) uniformly mixing the acrylic ester emulsion, cellulose ether, polyacrylamide, a polycarboxylic acid water reducing agent, a defoaming agent and water, and then adding the mixture into the raw materials in the step (1) to uniformly mix;
(3) and (3) adding the tailing sand and the quartz sand into the step (2), and uniformly mixing.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the high-impermeability cement-based repair material has the advantages of high breaking strength and compressive strength, high bonding strength, high impermeability grade, high impermeability pressure, low dry shrinkage, durability and the like; the problem that tunnel lining concrete is poor in self-waterproof performance in tunnel engineering can be solved, a tunnel lining structure which is corroded and degraded by water leakage can be repaired, the problem of tunnel water leakage is solved, the tunnel operation environment is improved, the problem that the self-waterproof performance is poor due to the fact that traditional lining concrete is not compact enough, shrinkage cracking or temperature load stress cracking and the like is solved, the deteriorated traditional lining concrete can be repaired and maintained in time, and the problem of water leakage in tunnel engineering is solved.
2. The invention takes portland cement, fly ash, silica fume and steel slag powder as composite gelled materials, rock powder and tailing sand as micro-aggregates, quartz sand as fine aggregates, PVA (polyvinyl alcohol) fibers and PEA (polyethylene oxide) fibers as toughening materials, attapulgite and cellulose ether as thickening agents, polyacrylamide and polycarboxylic acid water reducing agents as plasticizing agents, and acrylate emulsion, cellulose ether and defoaming agents as functional chemical admixtures, and the protective repairing material for the lining structure of the tunnel engineering can be obtained.
The selected quartz sand is prepared from quartz sand with the granularity of 10-60 meshes and 120-150 meshes according to the mass ratio of 6: 4; under the proportion, the fine aggregate has the largest stacking density and is in the closest stacking state, so that the compactness of the material can be greatly improved, and harmful pores of the material are reduced;
the PVA fiber is polypropylene alcohol fiber with the diameter of 12-14 mu m and the length of 6-12 mm; the PET fibers are polyester fibers with the diameter of 16-20 mu m and the length of 6-12 mm; the doped repair material of the fiber with the length and the diameter can enhance the toughness of the material, is beneficial to reducing the shrinkage cracking of the material, and adopts the fiber with different diameters to ensure that the material and a matrix act together to improve the tensile property at different stress stages;
the fine particles and large specific surface area of the used rock powder play a role in enhancing the initial concrete solidification, so that the stone waste is changed into valuable;
the phosphorus tailings belong to solid waste discharged in the process of mining phosphorus ore or after processing and producing phosphorus ore, the special particle composition fills up the particle composition between the cementing material and the fine aggregate, so that the particle composition of the material is more reasonable, the impermeability of the material is improved, and the resource utilization of the phosphorus tailings can be realized. The selected particle size range is 0.04-0.6 mm, wherein the particle size is not less than 70% below 0.075mm by weight, and the design can fill powder particle size faults between fine aggregates and cementing materials such as cement, silica fume, steel slag powder and the like, so that the particle size distribution of the repairing material is in a continuous state, the improvement of the compactness of the material is facilitated, and the anti-permeability performance is enhanced.
3. The matching relationship among the components is as follows: ordinary portland cement, fly ash, silica fume and steel slag powder are gelling components participating in hydration reaction, wherein the ordinary portland cement and the silica fume are high-activity components, can be quickly hydrated in the early stage of hydration, and are beneficial to strengthening the early strength; moreover, the particle size of the silica fume is greatly different from that of the cement, is obviously smaller than that of the cement particles, can be fully filled among the cement particles, increases the compactness of slurry, reduces pores and further improves the anti-permeability performance of the material; the steel slag and the fly ash are low-activity components, the steel slag particles after the grinding treatment further fill up the faults of the sizes of the silicon ash and the cement particles, the particle distribution of the cementing material can be further more continuous, and moreover, the low-activity components in the steel slag and the fly ash can play a role in inert micro-aggregate effect, reduce the shrinkage of slurry, reduce microcracks formed by the material due to drying shrinkage, and reduce adverse factors of water transmission and migration caused by the microcracks. Meanwhile, in the invention, the micro-aggregate and the fine aggregate are composed of rock powder, phosphate tailings and quartz sand with different particle size grades, so that the aggregate particle size distribution in the material is continuous, the particles are stacked to be in a closest stacking state, the macroscopic defects of the material are further reduced, and the repairing material is more compact and high-strength; the attapulgite and the cellulose ether in the invention improve the workability and the water retention of the material in a fresh-mixed state, so that the material is more uniform, is not easy to separate and bleed, is beneficial to construction, avoids material defects caused by improper construction, and causes the material performance to be deteriorated; the polymer particles obtained from the acrylate emulsion further fill the pores of the material and are coupled with hydration products to form a polymer film structure, so that the compactness of the material is improved, and the impermeability of the material is enhanced; the use of the silica fume, the rock powder and the cellulose ether increases the viscosity of the fresh slurry and is not beneficial to mechanical construction, and the compounding use of the polyacrylamide and the polycarboxylic acid water reducing agent can reduce the viscosity of the slurry, improve the rheological property of the slurry, ensure the smooth proceeding of mechanical construction and improve the pumpability under the condition of ensuring the large flowing of the fresh slurry of the material. The PVA fiber and the PET fiber are suitable for compounding, the volume stability of the material is improved, the toughness of the material is enhanced, the problem of microcrack cracking caused by stress concentration inside slurry due to chemical shrinkage, drying shrinkage and the like is solved, and the impermeability of the material is further improved.
4. The invention is characterized in that the gel materials with different particle size distribution ranges are utilized to form a closest packed gel body, different gel components are firstly and uniformly mixed in step (1) to form the gel material with continuously distributed particle sizes, wherein rock powder is a micro-aggregate, attapulgite is a powder plasticizer, the rock powder and the attapulgite can play a role in filling and plasticizing in slurry, the rock powder and the gel material can be uniformly distributed in the material after being mixed with the gel material in advance, and the fiber diameter is small, so that the powder is fully pre-mixed, and the agglomeration in the presence of water can be effectively prevented, thereby causing the occurrence of material defects; most of the chemical additives in the step (2) are used in a relatively small amount, and the corresponding effect is exerted mainly by improving the slurry liquid phase environment, so that the chemical additives are mixed with water in advance, are dispersed more uniformly and exert the effect better; the tailing sand and the quartz sand in the step (3) are fine aggregates which are the components with the largest particles in the material composition, and the tailing sand and the quartz sand are added finally, so that the aggregation of other components with fine particles on the surface can be effectively prevented, the stirring and the mixing of the material are not facilitated, and the overall performance of the material is influenced.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to specific examples, but the following examples do not limit the scope of the present invention in any way; the reagents referred to in the following examples are all commercially available conventional reagents unless otherwise specified.
Embodiment 1, a high impervious cement-based repair material for tunnel engineering, which is composed of the following raw materials in parts by weight: 100 parts of ordinary portland cement, 10 parts of fly ash, 5 parts of silica fume, 30 parts of steel slag powder, 15 parts of rock powder, 20 parts of tailing sand, 300 parts of quartz sand, 5 parts of attapulgite, 45 parts of acrylate emulsion (solid content is 45%), 1.0 part of cellulose ether, 0.45 part of polyacrylamide, 0.5 part of PVA fiber, 2.5 parts of PET fiber, 1.5 parts of polycarboxylic acid water reducer, 2.8 parts of defoaming agent and 30 parts of water.
The preparation method of the high-impermeability cement-based repair material for tunnel engineering comprises the following steps:
(1) taking the raw materials in the proportion, and uniformly mixing portland cement, fly ash, silica fume, steel slag powder, rock powder, attapulgite, PVA fiber and PET fiber;
(2) uniformly mixing the acrylic ester emulsion, cellulose ether, polyacrylamide, a polycarboxylic acid water reducing agent, a defoaming agent and water, and then adding the mixture into the raw materials in the step (1) to uniformly mix;
(3) and (3) adding the tailing sand and the quartz sand into the step (2), and uniformly mixing.
Embodiment 2, a high impervious cement-based repair material for tunnel engineering, which is composed of the following raw materials in parts by weight: 100 parts of 52.5-grade ordinary portland cement, 40 parts of fly ash, 20 parts of silica fume, 28 parts of steel slag powder, 5 parts of rock powder, 50 parts of tailing sand, 130 parts of quartz sand, 10 parts of attapulgite, 70 parts of acrylate emulsion (with the solid content of 60%), 0.1 part of cellulose ether, 1.0 part of polyacrylamide, 3.0 parts of PVA fiber, 0.6 part of PET fiber, 2.5 parts of polycarboxylic acid water reducer, 0.8 part of defoaming agent and 50 parts of water. The preparation method of the high-impermeability cement-based repair material for tunnel engineering is the same as that in example 1.
Embodiment 3, a high impervious cement-based repair material for tunnel engineering, which is composed of the following raw materials in parts by weight: 100 parts of 52.5-grade ordinary portland cement, 20 parts of fly ash, 10 parts of silica fume, 5 parts of steel slag powder, 20 parts of rock powder, 45 parts of tailing sand, 50 parts of quartz sand, 2 parts of attapulgite, 10 parts of acrylate emulsion (with the solid content of 60%), 0.8 part of cellulose ether, 0.6 part of polyacrylamide, 1.0 part of PVA fiber, 0.8 part of PET fiber, 1.0 part of polycarboxylic acid water reducer, 1.2 parts of defoaming agent and 25 parts of water. The preparation method of the high-impermeability cement-based repair material for tunnel engineering is the same as that in example 1.
Example of Effect verification
Under the same conventional test conditions, the sample blocks prepared in example 1, example 2 and example 3 were tested for performance test, and the compression and rupture strength: a hydraulic testing machine; fluidity: a truncated cone-shaped circular die: the height (60 plus or minus 0.5) mm, the inner diameter (70 plus or minus 0.5) mm of the upper opening and the inner diameter (100 plus or minus 0.5) mm of the lower opening; a steel ruler: the measuring range is not less than 500mm, and the precision is 1 mm; glass plate: the size is 500mm multiplied by 500 mm; tensile bond strength: a tensile testing machine (meeting the requirements of JCJ/T70 standard); and (3) seepage pressure resistance: SS-15 type impermeability instrument; dry shrinkage value: comparator (meeting JCJ/T70 standard requirements); ultimate tensile strength: 30t electronic servo universal tester.
The test results are shown in Table 1.
Table 1 shows the performance indexes of the high-impermeability cement-based repair material for tunnel engineering
Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes in the specific parameters of the embodiments may be made without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variations of the present invention, and will not be described in detail herein.
Claims (10)
1. The high-impermeability cement-based repair material for tunnel engineering is characterized by comprising the following raw materials in parts by weight: 100 parts of portland cement, 10-40 parts of fly ash, 5-20 parts of silica fume, 5-30 parts of steel slag powder, 5-20 parts of rock powder, 20-50 parts of tailing sand, 50-300 parts of quartz sand, 2-10 parts of attapulgite, 10-80 parts of acrylate emulsion, 0.1-1.0 part of cellulose ether, 0.1-1.0 part of polyacrylamide, 0.5-3.0 parts of PVA fiber, 0.6-2.8 parts of PET fiber, 1.0-2.5 parts of polycarboxylic water reducer, 0.8-2.8 parts of defoamer and 25-50 parts of water.
2. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, characterized by consisting of the following raw materials in parts by weight: 100 parts of portland cement, 15-30 parts of fly ash, 8-15 parts of silica fume, 6-12 parts of steel slag powder, 5-15 parts of rock powder, 25-40 parts of tailing sand, 100-250 parts of quartz sand, 2-8 parts of attapulgite, 10-70 parts of acrylate emulsion, 0.1-0.6 part of cellulose ether, 0.2-0.8 part of polyacrylamide, 0.5-2.5 parts of PVA fiber, 0.6-2.5 parts of PET fiber, 1.2-2.5 parts of polycarboxylic water reducer, 1.0-2.5 parts of defoamer and 25-40 parts of water.
3. The high impervious cement based repair material for tunnel engineering according to claim 1 wherein the portland cement is grade 52.5 ordinary portland cement; the fly ash is I-grade high-calcium fly ash, the content of free calcium oxide is 3.0 percent, and the loss on ignition is 4.6 percent; the silicon ash is a byproduct of ferroalloy in the process of smelting ferrosilicon and industrial silicon, namely SiO2The content is at least 92.5 percent, and the average grain diameter is 0.1-0.3 um; the steel slag powder is prepared by levigating steel slag subjected to hot stuffiness or carbonization treatment, the alkalinity coefficient of the steel slag powder is 1.6, and the specific surface area of the steel slag powder is 650m2/Kg。
4. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, wherein the rock powder is granite rock powder, the particle size range is 5-120 um, and the average particle size is 30.2 um; the tailing sand is naturally air-dried phosphorus tailing sand, the granularity range is 0.04-0.6 mm, and the granularity is less than 0.075mm and not less than 70% by weight.
5. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, wherein the quartz sand is prepared from quartz sand with a particle size of 10-60 mesh and 120-150 mesh according to a mass ratio of 6: 4.
6. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, wherein the attapulgite has a fineness of 200-300 mesh; the cellulose ether is of viscosity of
40000Pa.s hydroxypropyl methylcellulose ether.
7. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, wherein the acrylate emulsion has a solid content of 10-70%; the molecular weight of the polyacrylamide is 1500 ten thousand, and the solid content is more than 90%; the polycarboxylic acid water reducing agent is powder with a water reducing rate of at least 25%.
8. The high-impermeability cement-based repair material for tunnel engineering according to claim 1, wherein the PVA fibers are polypropylene alcohol fibers with a diameter of 12-14 μm and a length of 6-12 mm; the PET fibers are polyester fibers with the diameter of 16-20 mu m and the length of 6-12 mm.
9. The high impervious cement based repair material for tunnel engineering according to claim 1 wherein the defoaming agent is a silicone series defoaming powder.
10. A preparation method of a high-impermeability cement-based repair material for tunnel engineering is characterized by comprising the following steps:
(1) taking the proportioning raw materials as in claim 1, and uniformly mixing portland cement, fly ash, silica fume, steel slag powder, rock powder, attapulgite, PVA fiber and PET fiber;
(2) uniformly mixing an acrylate emulsion, cellulose ether, polyacrylamide, a polycarboxylic acid water reducing agent, a defoaming agent and water, and adding the mixture into the raw materials in the step (1) to uniformly mix;
(3) and (3) adding the tailing sand and the quartz sand into the step (2), and uniformly mixing.
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| CN113816703B (en) * | 2021-08-17 | 2022-08-02 | 山东大学 | High-solid-waste-content fiber polymer repair material and preparation method thereof |
| CN114085055B (en) * | 2021-10-25 | 2022-11-04 | 中南大学 | Secondary lining concrete suitable for high-ground-temperature tunnel in high-temperature and low-humidity environment and preparation method thereof |
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| CN117125945B (en) * | 2023-10-24 | 2024-02-02 | 上海建工集团股份有限公司 | Engineering repair material with low viscosity and high stability and preparation method thereof |
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| CN106007562A (en) * | 2016-05-19 | 2016-10-12 | 四川震强绿舍建材有限公司 | Dry-mixed mortar prepared from construction waste recycled aggregate and preparation method of dry-mixed mortar |
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| CN102295447B (en) * | 2011-05-31 | 2012-12-05 | 同济大学 | Quick-hardening early-strength structure reinforcement material based on aluminate cement and steel slag |
| CN106830848B (en) * | 2017-03-14 | 2019-06-07 | 中交武汉港湾工程设计研究院有限公司 | A kind of tunnel leak stopping patching material and preparation method thereof |
| CN109053092A (en) * | 2018-10-15 | 2018-12-21 | 陕西科技大学 | High-intensity and high-tenacity high thermal conductivity high-impermeable mass concrete and preparation method thereof |
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| CN102249629A (en) * | 2011-06-10 | 2011-11-23 | 上海三瑞高分子材料有限公司 | Acrylate emulsion modified cement-base repair mortar |
| CN103880372A (en) * | 2014-03-04 | 2014-06-25 | 北京纽维逊建筑工程技术有限公司 | Cement-based grouting material used for strengthening repairing as well as preparation method and application thereof |
| KR101674923B1 (en) * | 2016-05-04 | 2016-11-11 | (주)부루빌 | Repairing method of concrete structure using high-strength polymer mortar and fireproof mortar |
| CN106007562A (en) * | 2016-05-19 | 2016-10-12 | 四川震强绿舍建材有限公司 | Dry-mixed mortar prepared from construction waste recycled aggregate and preparation method of dry-mixed mortar |
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