CN113321464B - Anti-corrosion waterproof cement-based grouting material and preparation method thereof - Google Patents
Anti-corrosion waterproof cement-based grouting material and preparation method thereof Download PDFInfo
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- CN113321464B CN113321464B CN202110500599.5A CN202110500599A CN113321464B CN 113321464 B CN113321464 B CN 113321464B CN 202110500599 A CN202110500599 A CN 202110500599A CN 113321464 B CN113321464 B CN 113321464B
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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
- C04B2111/00241—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
-
- 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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
Abstract
The invention belongs to the technical field of building materials, and particularly relates to an anticorrosive waterproof cement-based grouting material and a preparation method thereof. The technical points are as follows: the composition comprises the following components in parts by weight: 750-1000 parts of cement, 80-200 parts of viscosity reducer, 5-30 parts of modified nano silicon oxide dispersion liquid, 50-150 parts of metakaolin, 50-100 parts of superfine quartz powder, 20-100 parts of anticorrosion curing agent, 20-50 parts of water reducer, 1-3 parts of defoaming agent, 10-30 parts of shrinkage reducer, 900-1100 parts of sand, 160-240 parts of water and 2-4 parts of synthetic fiber. The invention adopts the nano silicon oxide dispersion liquid, the metakaolin, the shrinkage reducing agent and the anticorrosion curing agent, can obtain the cement-based grouting material with excellent anticorrosion performance and good waterproof effect under the conventional maintenance condition, and has good economic benefit and practical value.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an anticorrosive waterproof cement-based grouting material and a preparation method thereof.
Background
The traditional cement-based grouting material takes cement as a cementing material, is doped with a proper amount of fine aggregate and a plurality of additives, has the characteristics of high fluidity, easy construction, early strength, high strength and the like after being added with water and stirred, has hardened slurry with certain strength after being cured for a certain period of time, and is widely used for secondary grouting, bolt anchoring and other projects of equipment foundations, steel structure foundations and the like, reinforcement of concrete beams, columns, plates and walls, filling, repairing and the like of concrete cavities. Compared with epoxy organic grouting material, the cement-based grouting material has higher mechanical property and excellent ageing resistance, and is widely applied to numerous projects. However, the cement-based grouting material is mostly contacted with metal embedded parts or steel bars in the application process, so that the cement-based grouting material generally plays roles in bonding, reinforcing and protecting, and the compactness of the cement-based grouting material and the thickness of a protective layer of the metal embedded parts such as the steel bars are difficult to guarantee due to limited construction operation.
In view of the defects of the existing cement-based grouting material, the inventor develops an anticorrosive waterproof cement-based grouting material and a preparation method thereof by matching theoretical analysis and innovation based on years of abundant experience and professional knowledge of the materials, adopts nano silicon oxide dispersion liquid, metakaolin, a shrinkage reducing agent and an anticorrosive curing agent, can obtain the cement-based grouting material with excellent anticorrosive performance and good waterproof effect under the conventional maintenance condition, and has good economic benefit and practical value.
Disclosure of Invention
The invention aims to provide an anti-corrosion waterproof cement-based grouting material, which improves the capillary pore microstructure of a hardened cement-based grouting material matrix, improves the waterproof performance of the hardened matrix and simultaneously enables the cement-based grouting material to have good anti-corrosion performance and rib protection performance.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides an anticorrosive waterproof cement-based grouting material which comprises the following components in parts by weight: 750-1000 parts of cement, 80-200 parts of viscosity reducer, 5-30 parts of modified nano silicon oxide dispersion liquid, 50-150 parts of metakaolin, 50-100 parts of superfine quartz powder, 20-100 parts of anticorrosion curing agent, 20-50 parts of water reducer, 1-3 parts of defoaming agent, 10-30 parts of shrinkage reducer, 900-1100 parts of sand, 160-240 parts of water and 2-4 parts of synthetic fiber.
Further, the cement is Portland cement or mixed cement of Portland cement and sulphoaluminate cement, and the specific surface area of the cement is not less than 400m2In terms of/kg. Wherein the initial setting time of the cement is preferably 45 min.
Further, the modified nano silicon oxide dispersion liquid contains 30-55% of solid and has an average particle diameter of 2-5 nm. Different from the traditional silicon micropowder, the nano silicon oxide in the nano silicon oxide dispersion liquid adopted by the invention is synthesized by a gas phase method, is modified, has small, uniform and controllable particle size, and can be stably dispersed in an aqueous solvent system.
Furthermore, the viscosity reducer adopted by the invention takes a popular composite admixture as a carrier, and can obviously reduce the thixotropic viscosity of the concrete mixture through the modification of the polymer with inorganic affinity groups, and the plastic viscosity ratio of the viscosity reducer is not more than 60%. The viscosity reducer adopted by the invention consists of sodium benzenesulfonate, polyacrylate, sodium sulfate and nanoscale ultrafine microbeads, has a good viscosity reducing effect when the viscosity ratio of the viscosity reducer is adjusted to be not more than 60%, and can greatly reduce the fluidity of the grouting material under the condition of a low water-to-cement ratio of less than or equal to 0.12, so as to ensure that the fluidity of the grouting material meets the standard requirement.
Furthermore, the average grain diameter of the anti-corrosion curing agent adopted by the invention is less than or equal to 10nm, the anti-corrosion curing agent is a nano powder material chemically formed with an alumina mineral phase, the anti-sulfuric acid erosion performance of the cement-based material can be effectively improved, and free chloride ions are captured and cured. And the sulfate erosion resistance is more than or equal to 20 percent, and the free chloride ion curing rate is more than or equal to 75 percent. The corrosion-resistant curing agent adopted by the invention is formed by mixing a calcium-aluminum-based layered double hydroxide ion curing agent, polyquaternary ammonium salt, silica fume and superfine slag powder, wherein the calcium-aluminum-based layered double hydroxide ion curing agent and the polyquaternary ammonium salt can adsorb and cure chloride ions and sulfate ions entering into the grouting material in an ion exchange manner; the silica fume and the ground slag powder are nano-scale powder materials, the use of the silica fume and the ground slag powder can optimize the pore structure of the hardened slurry of the grouting material, reduce the number of harmful through holes, further seal partial invasive chloride ions and sulfate ions in 'non-through holes', avoid the erosion of 'migratable' harmful ions to the grouting material, and further play a certain role in 'solidification'; the volcanic ash effect of the silica fume and the superfine slag powder in the hydration process can reduce the amount of calcium hydroxide generated by cement hydration while adsorbing and curing chloride ions and sulfate ions, and inhibit the formation of ettringite in the sulfate corrosion reaction process. The comprehensive effect of the components can greatly improve the sulfate erosion resistance and the chloride ion curing rate of the grouting material.
Furthermore, the defoaming agent adopted by the invention has good dispersibility and can ensure the strength.
Furthermore, the shrinkage reducing agent adopted by the invention is liquid, the shrinkage reducing rate of the mortar is more than or equal to 40%, the shrinkage reducing agent is an additive capable of always reducing the shrinkage value in the cement hardening process, the surface tension of water in the grouting material is reduced to reduce the capillary pore tension in the grouting material, and further the drying shrinkage, self-shrinkage and plastic shrinkage of the grouting material are greatly reduced, compared with the mortar without the shrinkage reducing agent, the plastic shrinkage and 28-day dry shrinkage of the mortar after the shrinkage reducing agent is mixed are both reduced by more than 40%, and the shrinkage reducing rate is more than or equal to 40%.
Further, the water reducing agent adopted by the invention is a polycarboxylic acid water reducing agent.
Further, the modified nano-silica in the modified nano-silica dispersion liquid contains unsaturated residual bonds and hydroxyl groups in different bonding states. The modified nano silicon oxide is prepared by modifying tetraethoxysilane serving as a precursor and ethanol serving as a solvent by a sol-gel method; compared with other preparation methods, the sol-gel method can be used for uniformly mixing nano-scale components such as nano-silicon oxide, ethyl silicate and the like in a short time, and quickly and fully finishing modification. Compared with the common nano silicon oxide, the modified nano silicon oxide with unsaturated residual bonds and hydroxyl groups in different bonding states is easier to disperse, higher in activity and more prominent in application effect.
Furthermore, the average particle size of the metakaolin is less than or equal to 80 μm.
Furthermore, the specific surface area of the superfine quartz powder is more than or equal to 1000m2/kg。
Furthermore, the sand is river sand or machine-made sand, and the maximum grain size is less than or equal to 2.36 mm.
Furthermore, the synthetic fiber is any one or more of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber or carbon fiber, and the fiber length is less than or equal to 10 mm. The invention improves the integrity and the compactness of the grouting material by adding the synthetic fiber, and reduces the number and the size of the cracks and the defects of the hardened cement aggregate; the synthetic fibers are preferably polyvinyl alcohol fibers, and the length of the polyvinyl alcohol fibers is preferably 6 mm. Compared with polypropylene fibers and polyacrylonitrile fibers, under the condition of similar material cost, the polyvinyl alcohol fibers have better alkali resistance and corrosion resistance and higher elastic modulus, and the crack resistance of the grouting material after being doped is improved more obviously; compared with carbon fiber, the polyvinyl alcohol fiber has very obvious price advantage, and has better economical efficiency when being used on the basis of enabling the grouting material to achieve the same crack resistance.
The second purpose of the invention is to provide a preparation method of the anti-corrosion waterproof cement-based grouting material, which has the same technical effect.
The technical purpose of the invention is realized by the following technical scheme:
the preparation method of the anti-corrosion waterproof cement-based grouting material comprises the following operation steps:
s1, adding sand, cement, viscosity reducer, metakaolin, superfine quartz powder, anticorrosion curing agent and synthetic fiber, and stirring for 1-2 min;
s2, adding a defoaming agent and a water reducing agent which are dissolved in water into the product obtained in the step S1, stirring for 3-5 min, fully mixing to form a cement-based grouting material mixture, and controlling the water reducing agent and the water consumption to keep the fluidity within the range of 320 +/-30 mm;
s3, adding the modified nano silicon oxide dispersion liquid and the shrinkage reducing agent into the cement-based grouting material mixture obtained in the step S2, and stirring for 2-3 min to obtain a mixture;
s4, the mixture obtained in the step S3 is molded and cured at normal temperature for 1-7 days in an environment with the relative humidity of more than or equal to 95%;
s5, curing the finished product at normal temperature for 7-14 days under the conditions that the humidity is more than or equal to 95% and the temperature is 10-40 ℃ after the mold is removed.
In conclusion, the invention has the following beneficial effects:
(1) according to the technical scheme, the viscosity reducer is added into the anti-corrosion waterproof cement-based grouting material, so that the problems that the cement-based grouting material is high in slurry viscosity under the condition of low water-to-adhesive ratio and difficult to guarantee construction and compactness are solved, and the compactness and the waterproof and anti-permeability performance of the cement-based grouting material are improved.
(2) According to the technical scheme, the modified nano silicon oxide dispersion liquid, the metakaolin and the anticorrosive curing agent are added into the anticorrosive waterproof cement-based grouting material, so that the performances of resisting erosion of erosion ions and curing chloride ions can be improved under the corrosive environment conditions of chloride, sulfate and the like, and the anticorrosive waterproof cement-based grouting material has better anticorrosive performance and reinforcement performance.
(3) According to the technical scheme, the modified nano silicon oxide dispersion liquid and the shrinkage reducing agent are doped into the anticorrosive waterproof cement-based grouting material, so that the capillary pore microstructure of the hardened cement-based grouting material matrix can be improved, and the waterproof performance of the hardened matrix is improved.
(4) According to the technical scheme, the conventional stirring and maintenance mode is adopted in the preparation method of the anti-corrosion waterproof cement-based grouting material, the comprehensive cost is low, the application in a project site is facilitated, the electric flux value is not more than 100 ℃ after 7d of age, the water-solid surface contact angle is more than 120 degrees, the anti-corrosion and waterproof performances are better, and the development and the application of the cement-based grouting material under the corrosive environment condition are promoted.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the concrete embodiments, features and effects of the anti-corrosion waterproof cement-based grouting material and the preparation method thereof according to the present invention are described in detail below.
The source of the raw materials used in the examples of the present invention is shown in Table 1.
TABLE 1 table of sources of raw materials in examples 1 to 5
The material mixing ratios of examples 1 to 5 are shown in Table 2.
TABLE 2 blending ratio of raw materials in examples 1 to 5
The preparation method of the anticorrosive waterproof cement-based grouting material of embodiments 1 to 5 includes the following operation steps:
s1, adding sand, cement, viscosity reducer, metakaolin, superfine quartz powder, anticorrosion curing agent and synthetic fiber, and stirring for 1-2 min;
s2, adding a defoaming agent and a water reducing agent which are dissolved in water into the product obtained in the step S1, stirring for 3-5 min, fully mixing to form a cement-based grouting material mixture, and controlling the water reducing agent and the water consumption to keep the fluidity within the range of 320 +/-30 mm;
s3, adding the modified nano silicon oxide dispersion liquid and the shrinkage reducing agent into the cement-based grouting material mixture obtained in the step S2, and stirring for 2-3 min to obtain a mixture;
s4, the mixture obtained in the step S3 is molded and cured at normal temperature for 1-7 days in an environment with the relative humidity of more than or equal to 95%;
s5, curing the finished product at normal temperature for 7-14 days under the conditions that the humidity is more than or equal to 95% and the temperature is 10-40 ℃ after the mold is removed.
Comparative examples
The raw materials of the comparative example were conventional portland cement, silica fume, graded quartz sand, water reducing agent. The compounding ratio of the comparative examples is as follows.
The preparation method of the cement-based grouting material of the comparative example includes the following operation steps:
A1. stirring the materials into a cement-based grouting mixture;
A2. b, filling the mixture obtained in the step A2 into a mold for molding, and curing at normal temperature for 1-7 d in an environment with the relative humidity of more than or equal to 95%;
A3. and (4) curing the cured finished product at normal temperature for 7-14 days under the conditions that the humidity is more than or equal to 95% and the temperature is 10-40 ℃ after the mold is removed.
Performance testing
Durability and contact angle test tests are carried out on the examples 1-5 and the comparative example, the durability tests such as electric flux, chloride ion migration coefficient and steel bar corrosion performance are carried out according to the current standard GB/T50082 of test method for long-term performance and durability of concrete, and the contact angle test is carried out according to the current standard T/CECS 521 of application technical Specification for anti-freezing waterproof alloy powder, and the test results are shown in Table 3.
TABLE 3 Properties of the anticorrosive and waterproof grouting materials
The results are combined, so that the anticorrosive waterproof grouting material cured at the normal temperature of 7-14 days can obtain better anticorrosive performance, has better compactness and has waterproof performance obviously superior to the traditional cement-based grouting material.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The anti-corrosion waterproof cement-based grouting material is characterized by comprising the following components in parts by weight: 750-1000 parts of cement, 80-200 parts of viscosity reducer, 5-30 parts of modified nano silicon oxide dispersion liquid, 50-150 parts of metakaolin, 50-100 parts of superfine quartz powder, 20-100 parts of anticorrosion curing agent, 20-50 parts of water reducer, 1-3 parts of defoaming agent, 10-30 parts of shrinkage reducer, 900-1100 parts of sand, 160-240 parts of water and 2-4 parts of synthetic fiber.
2. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the cement is portland cement or a mixed cement of portland cement and sulphoaluminate cement, and the specific surface area of the cement is not less than 400m2/kg。
3. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the modified nano silica dispersion has a solid content of 30 to 55% and an average particle diameter of 2 to 5 nm.
4. The anti-corrosion waterproof cement-based grouting material according to claim 3, wherein the modified nano-silica in the modified nano-silica dispersion liquid contains unsaturated residual bonds and hydroxyl groups in different bonding states.
5. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the metakaolin has an average particle size of 80 μm or less.
6. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the specific surface area of the ultrafine quartz powder is not less than 1000m2/kg。
7. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the sand is river sand or machine-made sand, and the maximum particle size is less than or equal to 2.36 mm.
8. The anti-corrosion waterproof cement-based grouting material according to claim 1, wherein the synthetic fiber is any one or more of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber or carbon fiber, and the fiber length is less than or equal to 10 mm.
9. The preparation method of the anti-corrosion waterproof cement-based grouting material according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, adding sand, cement, viscosity reducer, metakaolin, superfine quartz powder, anticorrosion curing agent and synthetic fiber, and stirring for 1-2 min;
s2, adding a defoaming agent and a water reducing agent which are dissolved in water into the product obtained in the step S1, stirring for 3-5 min, fully mixing to form a cement-based grouting material mixture, and controlling the water reducing agent and the water consumption to keep the fluidity within the range of 320 +/-30 mm;
s3, adding the modified nano-silica dispersion liquid and the shrinkage reducing agent into the cement-based grouting material mixture obtained in the step S2, and stirring for 2-3 min to obtain a mixture;
s4, molding the mixture obtained in the step S3, and curing at normal temperature for 1-2 d in an environment with the relative humidity of more than or equal to 95%;
and S5, curing the cured finished product at normal temperature for 7-14 days under the conditions that the humidity is more than or equal to 95% and the temperature is 10-40 ℃ after the mold is removed.
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| CN104402345B (en) * | 2014-11-28 | 2016-07-06 | 中建商品混凝土成都有限公司 | A kind of big micro-swollen high-strength grout of fluidised form |
| JP6674301B2 (en) * | 2016-03-29 | 2020-04-01 | 太平洋マテリアル株式会社 | Cement-based low-viscosity fast-hardening grout material |
| CN106810176A (en) * | 2017-03-29 | 2017-06-09 | 石家庄市易达恒联路桥材料有限公司 | A kind of low viscosity upper flow regime strength cement-based grouting material |
| CN111116132A (en) * | 2019-12-25 | 2020-05-08 | 中冶建筑研究总院有限公司 | Grouting material for combined structure and assembly type building node and preparation method thereof |
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