CN114702262A - Anti-permeability self-repairing concrete additive, self-repairing agent and preparation method thereof - Google Patents
Anti-permeability self-repairing concrete additive, self-repairing agent and preparation method thereof Download PDFInfo
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- CN114702262A CN114702262A CN202210402153.3A CN202210402153A CN114702262A CN 114702262 A CN114702262 A CN 114702262A CN 202210402153 A CN202210402153 A CN 202210402153A CN 114702262 A CN114702262 A CN 114702262A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses an anti-permeability self-repairing concrete admixture, a self-repairing agent and a preparation method thereof, wherein the admixture is implemented according to the grading of C25, and comprises the following components in percentage by weight: 6-12% of self-repairing agent (based on cement); 0.03 to 0.1 percent of curing initiator (based on cement); 1% of water reducing agent (prepared according to the water consumption); the self-repairing agent comprises the following components in percentage by weight: 10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7-1% of cross-linking agent; 0.3 to 0.5 percent of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water. The invention also provides a preparation method of the self-repairing agent. The invention solves the contradiction that the water-absorbing polymer absorbs water to expand to destroy the cement solidification, simultaneously carries out the chain-linking and hydration of the water-absorbing material, improves the impermeability strength of a test piece by multiple times to a very high degree (not less than P12), meets the waterproof use requirement of engineering and achieves the self-repairing effect.
Description
Technical Field
The invention belongs to the technical field of special impervious concrete, and particularly relates to an impervious self-repairing concrete admixture, a self-repairing agent and a preparation method thereof.
Background
The current waterproof materials mainly comprise waterproof coiled materials and waterproof coatings. The waterproof coiled material mainly comprises a modified asphalt coiled material, a self-adhesive asphalt waterproof coiled material and a polymer coiled material.
The modified asphalt coiled material needs a flame spray gun to carry out on-site surface hot melting, needs open fire, has high technical requirement and is easy to coke surface hot melt adhesive, like SBS and APP coiled materials which are popular in the market of waterproof materials at present. The width of the coiled material is only one meter, so that more lap joints are formed during laying, and the coiled material needs to be cut due to the shape requirement of the base layer, so that the lap joint quantity is larger, and the waterproof hidden danger of seams is easily caused; the self-adhesive asphalt waterproof coiled material has the problems of weak adhesive force and easy falling.
The adhesion of the polymer coiled material and the base layer adopts a chloroprene adhesive, the water resistance is poor, and the water resistance failure is easily caused by degumming, so the adhesion of the polymer coiled material becomes the key of the water-proof quality.
The waterproof paint is excellent waterproof material, and is divided into asphalt waterproof paint and polymer waterproof paint. The present high molecular waterproof paint has excellent performance and may be produced into color to make roof color rich. The high molecular paint adopted at present adopts water emulsion paint based on water emulsion, and the paint is cold-applied, but the solid content is low and generally does not exceed (60-70%), the thickness of each coating is limited by curing conditions, the paint cannot be thick, the film forming needs to be coated for many times, the moisture of the emulsion cannot volatilize under the humid condition, and the paint cannot be cured, so that the paint is very inconvenient. The thickness of the coating is required to be coated for multiple times to meet the requirements of waterproof technical specifications, so that the effect is greatly influenced, and the application range is limited.
The problems of the material performance and the technical defects limit the improvement and perfection of the waterproof engineering quality, and a complete scheme is urgently needed to solve the problems.
However, the above materials only protect the surface of the building mortar and the structure, and it is difficult to improve the body. Because the aging time of the organic material is short, the organic material is difficult to have the same service life with inorganic materials such as mortar and the like. In addition, the construction conditions are limited to a certain extent, and are influenced by factors such as the appearance of a building structure, the environment and the like, so that the construction is difficult under a plurality of conditions.
The concrete body is improved, the waterproof and defect repairing capability of the concrete body is improved, and the method is one of very important means for improving the waterproof and anti-permeability performance of a building. At present, polymer emulsion and rubber powder are mixed into mortar to improve the compactness and the waterproofness. But the construction and proportioning problems and the defect loosening and leakage in the later stage of cement curing are not influenced.
In engineering practice, in the casting of concrete. The water-proof failure of concrete can be caused by the influences of slump, construction method, maintenance conditions and the like and some process errors. Some water leaks are complicated, and existing engineering repair techniques are difficult to operate or very costly to repair.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide an anti-permeability self-repairing concrete admixture for an underground concrete structure, which can solve the problems of construction reasons such as concrete slump and improper maintenance, and leakage caused by loose and tiny cracks due to incompact pouring and tamping caused by concrete structure change.
In order to achieve the first object, the invention adopts the technical scheme that:
the impervious self-repairing concrete admixture is prepared from cement, sand and stone serving as main bodies according to the C25 gradation: water: 175kg of cement: 398kg of sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) as base addition.
The paint comprises the following components in percentage by weight:
6-12% of self-repairing agent (based on the weight of cement);
0.03 to 0.1 percent of curing initiator (based on the weight of cement);
1% of water reducing agent (prepared according to the water consumption).
Preferably, the paint comprises the following components in percentage by weight:
6-10% of self-repairing agent (based on the weight of cement);
0.05 to 0.1 percent of curing initiator (based on the weight of cement);
1% of water reducing agent (prepared according to the water consumption).
Further, the self-repairing agent is one or a mixture of polyamides and polyacrylate high-low crosslinked polymers; the curing initiator is one of ammonium persulfate and sodium persulfate; the water reducing agent is one of lignosulfonate, melamine water reducing agents and powder polycarboxylate.
The additive is added into concrete, after the concrete is cured and leaks due to loose or insufficient impervious strength, the impervious capability of the concrete can be greatly improved after a period of self-curing in water or in a wet state, the self-repairing defect is achieved, and the functions of impervious and leaking stoppage are recovered. The barrier strength will increase as a normality. For example, the water pressure is increased and then the breakdown leakage is carried out, so that the impermeability strength can be improved again. The anti-permeability capability of the material is recovered, and the material has the capability of repairing after being punctured for many times. It has obvious repairing effect on the anti-seepage structure. The mortar impermeability strength of the P6 with low initial impermeability strength of the test piece can be improved by multiple times to a high degree (more than or equal to P12), and the requirement of engineering waterproof use can be met.
The invention also aims to provide a proportion and a preparation method of the concrete self-repairing agent. The impervious self-repairing concrete self-repairing agent comprises the following components in percentage by weight:
10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7 to 1 percent of cross-linking agent;
0.3 to 0.5 percent of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water.
Preferably, the composition comprises the following components in percentage by weight:
11-17% of polymer liquid; 8-10% of sodium hydroxide; 0.7 to 0.9 percent of cross-linking agent;
0.3 to 0.5 percent of crosslinking accelerator; 10-16% of water-soluble magnesium salt; 45-55% of deionized water.
Further, the polymer liquid is one of an acrylic acid monomer and acrylamide.
Further, the cross-linking agent is one of polyethylene glycol diallyl, poly (epoxydialkyl glycol) and N, N-methylene bisacrylamide.
Further, the crosslinking accelerator is one of triethanolamine and polyethylene glycol.
Further, the water-soluble magnesium salt is one of hydrated magnesium chloride and magnesium sulfate.
The invention also provides a preparation process method of the self-repairing agent, which comprises the following steps:
slowly dripping sodium hydroxide solution into the polymer liquid for neutralization in an ice bath or under the condition of introducing cooling water to prepare neutral sodium salt solution, and controlling the temperature in the neutralization process to be lower than 40 ℃; and adding a cross-linking agent and a cross-linking accelerator, slowly adding a water-soluble magnesium salt, and uniformly stirring to obtain white or transparent liquid, thereby preparing the low-cross-linking self-repairing agent liquid.
The sodium salt of the polymer is a water-absorbing material, but is soft after absorbing water. Easily broken under strong stirring. But the strength is increased by calcification in the cement, and the cement is loosened even though the strength is increased quickly, and after the water-soluble magnesium salt is added, a comprehensive chelate of calcium and magnesium is formed on the surface. The steel is compact and has high internal strength. Meanwhile, the strength of the water-absorbing polymer sodium-magnesium salt liquid after cross-linking is greatly greater than that of the single water-absorbing polymer sodium salt. The strength of the concrete is not affected.
The invention has the advantages that the liquid crosslinking process of the water-absorbing polymer sodium-magnesium salt and the hydration process of cement are integrated at the same time, and the surface of the water-absorbing polymer is chelated under the condition of rich calcium ions and aluminum ions. Forming comprehensive chelate of calcium and magnesium. Meanwhile, certain moisture is increased for the later hydration stage of the cement, and the solidification degree of the mortar is increased. This sequestration is limited to water-absorbing polymer surfaces. An egg-shaped material is formed, the surface is hard, and the inner part is soft. When the concrete structure defect is penetrated by water, the polymer is broken only by the surface strength because the strength of the polymer is very low, and the internal material absorbs water to swell and block the water channel. And promotes the hydration and crystallization of unhydrated cement. At the same time, the surface of the material is re-chelated, and more crust is formed, and the expansion is stopped. If the water pressure rises again, the shell ruptures again, again creating more shell. Greatly improves the impermeability of the concrete
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the water-absorbing polymer is added into a cement material, and can immediately absorb water and expand after meeting water, so that the viscosity is increased, the workability is greatly influenced, the water-absorbing polymer can shrink after losing water, a plurality of cracks can be generated, and the water-absorbing polymer is difficult to use. The method solves the contradiction that the water absorption polymer absorbs water to expand to destroy the cement solidification, and can simultaneously perform the chain-linking, crosslinking and hydration of the water absorption material;
2. the water absorbing material is chelated by free calcium ions of cement in a short time, so that the water absorbing material loses expansibility temporarily, and when a polymer balance system is damaged by water pressure force, the water channel is immediately blocked by expansion. The self-repairing performance is achieved;
3. the self-repairing idea is rigid and flexible, can be used in the environment of alternation of dryness and wetness, and can still work under the condition of repeated cracking;
4. the water absorption rate and the curing time of the water absorption material can be controlled, and the application range is wide. Since the water absorption of the water-absorbent material is determined by the degree of crosslinking at the time of its production, that is, the proportion of the crosslinking agent and the amount of the crosslinking accelerator. Adjusting the proportion and the absolute value of the dosage. The required water absorption and strength can be obtained. Thus, the water-swelling difficulty of the product is too high even if the degree of crosslinking is too high. Affecting the repair ability. And prevents the water absorption rate from being lowered when the degree of crosslinking is too low. The strength of the concrete is reduced by excessive water absorption. The curing time is controlled by the amount of ammonium persulfate and sodium persulfate as curing initiators. The quantity of the curing agent can control the increase speed of the molecular weight of the polymer to be matched with the curing speed of the material of the cement, so that the curing agent becomes solid after the cement is cured, the bonding rate is improved, the curing strength of the cement is prevented from being influenced too slowly, and the curing agent and the cement are separated too quickly.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The self-repairing agent comprises the following components in parts by weight:
dissolving sodium hydroxide in water, and neutralizing acrylic acid and sodium hydroxide according to the molar ratio of 1:1 to obtain a specified pH value, wherein the whole process temperature is not higher than 40 ℃, and the polymerization reaction temperature is too high to easily cause self-polymerization. Adding a crosslinking agent N, N-methylene bisacrylamide and a crosslinking accelerator triethanolamine, slowly adding magnesium chloride hexahydrate, and completely dissolving to obtain the self-repairing agent liquid.
The concrete material is prepared by taking cement, sand and stone as main bodies according to the C25 gradation: water: 175kg of cement: 398kg of sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) as base, 0.07% of solid sodium persulfate (based on the weight of cement) is added for pre-mixing. 7 percent of self-repairing agent (based on the weight of cement) is mixed with water and stirred, and 1 percent of powder polycarboxylate water reducing agent (based on the water consumption required by slump) is prepared.
And (3) performance testing:
the lowest P12 standard is achieved.
Example 2
The self-repairing agent comprises the following components in parts by weight:
dissolving sodium hydroxide in water, and neutralizing acrylic acid and sodium hydroxide according to the molar ratio of 1:1 to obtain a specified pH value, wherein the whole process temperature is not higher than 40 ℃, and the polymerization reaction temperature is too high to easily cause self-polymerization. Adding cross-linking agent N, N-methylene bisacrylamide and cross-linking accelerator triethanolamine, and slowly adding magnesium chloride hexahydrate until the magnesium chloride hexahydrate is completely dissolved. Thus obtaining the self-repairing agent liquid.
The concrete material is prepared by taking cement, sand and stone as main bodies according to the C25 gradation: water: 175kg of cement: 398kg of sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) as base, 0.07% of solid sodium persulfate (based on the weight of cement) is added for pre-mixing. 7 percent of self-repairing agent (based on the weight of cement) is mixed with water and stirred, and 1 percent of powder polycarboxylate water reducing agent (based on the water consumption required by slump) is prepared.
And (3) performance testing:
the lowest P15 standard is achieved.
Example 3
The self-repairing agent comprises the following components in parts by weight:
dissolving sodium hydroxide in water, neutralizing acrylic acid and sodium hydroxide according to the molar ratio of 1:1 to obtain a specified pH value, wherein the whole temperature is not higher than 40 ℃, and the polymerization reaction temperature is too high to easily cause self-polymerization. Adding polyethylene glycol diallyl ether as a crosslinking agent and triethanolamine as a crosslinking promoter, and slowly adding magnesium sulfate until the magnesium sulfate is completely dissolved. Thus obtaining the self-repairing agent liquid.
The concrete material is mainly made of cement, sand and stone and is implemented according to the C25 gradation: water: 175kg of cement: 398kg of sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid ammonium persulfate (based on the weight of cement) is added into the mixture for pre-mixing, and 0.05 percent of solid ammonium persulfate is added into the mixture for pre-mixing. 7 percent of self-repairing agent (based on the weight of cement) is mixed with water and stirred, and 1 percent of melamine water reducing agent (based on the water consumption required by slump) is prepared.
And (4) performance testing:
the minimum reaches the standard of > P12.
Example 4
The self-repairing agent comprises the following components in parts by weight:
dissolving sodium hydroxide in water, and neutralizing acrylamide and sodium hydroxide according to the molar ratio of 1:1 to obtain a specified pH value, wherein the whole process temperature is not higher than 40 ℃, and the polymerization reaction temperature is too high to easily cause self-polymerization. Adding crosslinking agent poly-epoxy-dialkyl diol and crosslinking accelerator polyethylene glycol, slowly adding magnesium chloride hexahydrate, and dissolving completely. Thus obtaining the self-repairing agent liquid.
The concrete material is prepared by taking cement, sand and stone as main bodies according to the C25 gradation: water: 175kg of cement: 398kg of sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid ammonium persulfate (based on the weight of cement) is added into the mixture for pre-mixing, and 0.09 percent of solid ammonium persulfate is added into the mixture for pre-mixing. 10% of self-repairing agent (based on the weight of cement) is mixed with water and stirred, and 1% of lignosulfonate water reducing agent (based on the water consumption required by slump) is prepared.
And (3) performance testing:
the P12 standard is met at the lowest level.
Claims (10)
1. The impervious self-repairing concrete self-repairing agent is characterized by comprising the following components in percentage by weight:
10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7 to 1 percent of cross-linking agent;
0.3 to 0.5 percent of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water.
2. The impervious self-repairing concrete self-repairing agent of claim 1, which is characterized by comprising the following components in percentage by weight:
11-17% of polymer liquid; 8-10% of sodium hydroxide; 0.7 to 0.9 percent of cross-linking agent;
0.3 to 0.5 percent of crosslinking accelerator; 10-16% of water-soluble magnesium salt; 45-55% of deionized water.
3. The impervious self-repairing concrete self-repairing agent of claim 1, wherein the polymer liquid is one of an acrylic acid monomer and acrylamide.
4. The impervious self-repairing concrete self-repairing agent according to claim 1, wherein the cross-linking agent is one of polyethylene glycol diallyl, polydioxanediol and N, N-methylene bisacrylamide.
5. The impervious self-repairing concrete self-repairing agent of claim 1, wherein the crosslinking accelerating agent is one of triethanolamine and polyethylene glycol.
6. The impervious self-repairing concrete self-repairing agent according to claim 1, wherein the water-soluble magnesium salt is one of hydrated magnesium chloride and magnesium sulfate.
7. An impervious self-repairing concrete admixture is prepared from cement, sand and stone as main components according to the gradation of C25: 175kg of water; 398kg of cement; 566kg of sand; 1261kg of stones is used as basic addition, and the mixing proportion is as follows: 0.44:1:1.42:3.17, characterized in that the admixture comprises the following components by weight percent:
the impervious self-repairing concrete self-repairing agent of any one of claims 1 to 6 (based on the weight of cement) is 6 to 12 percent;
0.03 to 0.1 percent of curing initiator (based on the weight of the cement);
1% of water reducing agent (prepared according to the water consumption).
8. The impervious self-repairing concrete admixture of claim 7, which is characterized by comprising the following components in percentage by weight:
the impervious self-repairing concrete self-repairing agent of any one of claims 1-6 (based on the weight of the cement) is 6-10%;
0.05 to 0.1 percent of curing initiator (based on the weight of cement);
1% of water reducing agent (prepared according to the water consumption).
9. The impervious self-repairing concrete admixture of claim 7 or 8, wherein the self-repairing agent is one or a mixture of polyamides and polyacrylate high-low crosslinked polymers; the curing initiator is one of ammonium persulfate and sodium persulfate; the water reducing agent is one of lignosulfonate, a melamine water reducing agent and powder polycarboxylate.
10. The preparation method of the impervious self-repairing concrete self-repairing agent as claimed in any one of claims 1 to 6, characterized by adopting the following process:
slowly dripping sodium hydroxide solution into the polymer liquid for neutralization in an ice bath or under the condition of introducing cooling water to prepare neutral sodium salt solution, and controlling the temperature in the neutralization process to be lower than 40 ℃; and adding a cross-linking agent and a cross-linking accelerator, slowly adding a water-soluble magnesium salt, and uniformly stirring to obtain white or transparent liquid, thereby preparing the low-cross-linking self-repairing agent liquid.
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| CN115594438A (en) * | 2022-10-25 | 2023-01-13 | 安徽海螺材料科技股份有限公司（Cn） | Concrete segregation repairing agent and preparation method thereof |
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| CN106082893A (en) * | 2016-06-29 | 2016-11-09 | 浙江工业大学 | Seepage selfreparing waterproof mortar and preparation method thereof |
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| CN114702262B (en) | 2023-05-12 |
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