CN113999049A - Preparation method of carbonate coating for protecting concrete prefabricated part - Google Patents
Preparation method of carbonate coating for protecting concrete prefabricated part Download PDFInfo
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- CN113999049A CN113999049A CN202111440374.1A CN202111440374A CN113999049A CN 113999049 A CN113999049 A CN 113999049A CN 202111440374 A CN202111440374 A CN 202111440374A CN 113999049 A CN113999049 A CN 113999049A
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/68—Silicic acid; Silicates
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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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5024—Silicates
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and discloses a preparation method of a carbonate coating for protecting a concrete prefabricated part. Firstly, soaking a concrete prefabricated part in alkaline calcareous material slurry or directly coating the surface of the prefabricated part with the slurry, and performing carbonation maintenance to enable smelting slag powder to perform carbonation reaction to form a carbonate coating on the surface of the prefabricated part; placing the soaked test piece in a carbonization reaction kettle, and introducing CO2A gas. The invention fully utilizes the smelting slag; in the process of carbonating and treating the smelting slag, the greenhouse gas CO is introduced2Carrying out permanent sealing; the carbonated product of the smelting slag can wrap the precast concrete component, the carbonated product can fill cracks and microcracks in the precast concrete through osmotic crystallization, the compactness of the treated precast concrete component is improved, and the impermeability is improvedThe performance is increased, and the surface hardness is enhanced for the formed carbonic acid product protective layer on the surface. The treatment process can finally improve the durability and the impermeability of the concrete prefabricated part.
Description
Technical Field
The invention relates to the technical field of building materials, and aims to improve the strength and durability of a concrete prefabricated part, a coating layer taking carbonate as a main body is formed by coating or permeating and mineralizing the surface of the concrete prefabricated part, so that the impermeability and compactness of the prefabricated part are improved, and the mechanical property and durability of the concrete prefabricated part are improved.
Background
In China, since 2016 is popularized comprehensively, the prefabricated building has the advantages of high efficiency, high precision, good structure seismic performance, capability of greatly reducing manual dependence and the like, and is widely used. It is known that concrete itself is a porous structure, has some micropores, microcracks and even some through gaps, and is prone to leakage, which provides a passage for harmful ions to enter the interior of concrete, resulting in deterioration of concrete members and reduced service life of structures. Therefore, researches and patents on waterproof materials of buildings are frequently repeated, and a part of commercially available waterproof coatings really play a vital role in engineering application, so that the service life of concrete is prolonged. The waterproof coating is mainly divided into two main categories, namely organic waterproof materials (such as asphalts, high polymer modified asphalts and the like) and inorganic waterproof materials (such as inorganic salt cement, polymer cement and the like), and is widely applied to underground, outer surfaces and roofs of tunnels, subways and buildings. But their use is somewhat limited due to their own drawbacks. For example, organic waterproof materials cause immeasurable harm to constructors and environment in the production and use processes; however, inorganic waterproof materials are easy to handle during use, but their poor flexibility limits their use in areas with widely varying structures. The key to the water resistance and leakage prevention of the concrete is to block micropores and cracks on the outer surface of the concrete and improve the compactness of the concrete.
The cement and other smelting slag are alkaline materials, and are very suitable for CO due to high Ca content, high pH value and high carbonation activity2And (4) permanent mineralization and sealing. Meanwhile, the problem of poor stability after the smelting slag powder is subjected to grinding, alkali excitation and carbonation treatment is solved. Compared with the common Portland cement test piece, the carbonation product has the advantages of reduced porosity and more compact microstructure. Characterization of the porosity of the open pores of the test block before and after carbonation and the compressive strength of the test block revealed that the carbonated product was obtainedHas better strength and anti-carbonization capability, and the researches lay an important theoretical foundation for the production and the application of carbonated products. The alkaline calcareous material generates calcium carbonate with different crystal forms through carbonation reaction, and the calcium carbonate is mainly calcite type calcium carbonate; calcite and C-S-H are generated early in the carbonation reaction of the alkaline calcareous material. The carbonated product of the material is microcosmically compact, and particularly calcite type calcium carbonate and C-S-H gel can grow in situ in pores, so that the matrix is more compact, and the service life of the concrete prefabricated member is prolonged on the premise of ensuring the safety design of the concrete prefabricated member.
In the waterproof material of the multilayer mechanism disclosed in CN 209924292U, the water absorbing layers on the upper and lower sides sandwich the middle waterproof layer, wherein the waterproof layer is a multilayer structure formed by impregnating polyethylene resin film or polyethylene resin film and asphalt, and the water absorbing layer and the waterproof layer are connected by an adhesive. The water absorbing layer on the outermost layer is provided with embossing grooves, and the average distance is 2500-. The material is fixed on the outer surface of a structure through nails to achieve the waterproof effect. However, whether the waterproof effect and the like meet the national standard requirements or not and the requirements on the base body during construction are not explained in the invention; the waterproof layer is made of organic resin or asphalt, the durability, particularly the ultraviolet radiation resistance, of the waterproof layer is poor, the waterproof layer can age after being used for a long time, and the waterproof effect is reduced; for the water absorbing layer, when the water storage problem is met, the water absorbing material reaches a saturated state, and whether the waterproof material can achieve the waterproof target or not is worth exploring. The novel waterproof coating comprises a cement-based permeable crystalline coating layer, an adhesive layer (butyl rubber hot melt adhesive), an elastic waterproof layer (ethylene propylene diene monomer coiled material) and a heat-insulating layer (hard polyurethane foam plastic) from bottom to top, and is constructed and laid in sequence to achieve the heat-insulating and waterproof effects; the water barrier properties of the water-repellent coating are characterized in the examples. But the ductility (the breaking elongation of the waterproof coating) of the waterproof coating is neglected, and the coating comprises four layers of coatings with different functions, so that the construction is complicated; for the cement-based capillary crystalline layer close to the substrate, water needs to penetrate through the heat-insulating layer, the elastic waterproof layer and the adhesive layer, and the effect of capillary crystalline cannot be achieved in a short time, if the phenomenon occurs, the heat-insulating and waterproof effects of the outer three layers (organic high-molecular materials) are irreversibly damaged.
Disclosure of Invention
The alkaline calcareous material comprises silicate cement, hydrated lime, steel slag, carbide slag and other materials; the method mainly comprises the steps of improving the durability, particularly the waterproof performance, of the concrete prefabricated part, adopting carbonation treatment of alkaline materials such as smelting slag high Ca and high pH, blocking pores on the outer surface of the concrete prefabricated part, improving the compactness of the concrete prefabricated part, forming a protective layer with high strength and high compactness on the outer surface of the concrete prefabricated part, and improving the impermeability and the durability of the concrete prefabricated part. The concrete itself is a porous structure, which is CO2Carbonic acid dissolved in water and chloride ions and the like in the ocean of harbor engineering enter the concrete to provide a passage, so that the durability of the concrete member is poor, and simultaneously, the reinforcing steel bars in the reinforced concrete are corroded, and the mechanical property of the reinforced concrete is reduced. After the concrete prefabricated part is soaked in the smelting slag slurry, carbonation treatment is carried out, on one hand, calcium carbonate crystals mainly comprising calcite are generated after the smelting slag is carbonated, the calcite has higher indentation modulus and hardness, and the carbonated product has higher mechanical property due to the mechanical occlusion effect of the calcite, and wraps the concrete prefabricated part to form a protective layer with higher strength, so that the compactness of the surface of the concrete prefabricated part can be improved, and the surface hardness of the concrete prefabricated part is enhanced; on the other hand, after the concrete is soaked in the smelting slag slurry for a certain period of time, the slurry can penetrate a part of the concrete along the cracks on the surface of the concrete, the slurry penetrating into the concrete can also generate carbonation reaction in the carbonation treatment process to generate compact calcite crystals, the cracks in the concrete are blocked in a manner of permeation crystallization, and the compactness and the impermeability of the interior of the precast concrete are improved.
The preparation method of the carbonate coating for protecting the concrete prefabricated part comprises the following steps:
the first step is as follows: soaking the concrete prefabricated part in alkaline calcareous material slurry with different fineness or directly coating the slurry on the surface of the concrete prefabricated part, and performing carbonation maintenance to enable smelting slag powder to perform carbonation reaction to form a carbonate coating on the surface of the concrete prefabricated part;
the second step is that: soaking or directly brushing for 5min-3h, taking out, and measuring the thickness of the steel slag slurry coating on the surface of the test piece;
the third step: and placing the treated test piece in a carbonization reaction kettle for carbonation treatment.
The liquid-solid ratio of the alkaline calcareous material slurry is 0.5-1.5.
The alkaline calcareous materials with different fineness refer to alkaline calcareous material powder with fineness of more than 300m 2/kg. The alkaline calcium material powder with the fineness of more than 300m2/kg is mainly composed of alkaline materials such as calcium oxide, calcium hydroxide, dicalcium silicate, tricalcium silicate and calcium silicate hydrate.
The carbonation conditions include carbon dioxide concentration, temperature, humidity, pressure and carbonation time. The concentration of the carbon dioxide is tail gas, flue gas and the like with the carbon dioxide content of more than 30 percent, and the pressure reaches 1-20 atmospheric pressure; the temperature is 20-80 ℃; the humidity is 60-100 relative humidity; the carbonation time is 3min-120 min; controlling different alkaline material proportions to form a calcium carbonate protective layer mainly comprising calcite or aragonite.
The duration of the carbonation treatment determines the content of the carbonated product and also the content ratio of calcium carbonate (calcite, aragonite, vaterite) in different crystal forms in the carbonated product, that is, the duration of the carbonation treatment determines the strength of the steel slag after the carbonation treatment on the surface of the component; for the steel slag slurry permeated into the concrete, carbonation treatment is carried out for different time lengths, carbonation reaction of different degrees is carried out on the permeated steel slag slurry, calcium carbonate crystals with a compact microstructure are generated, C-S-H gel is generated by short-time carbonation treatment, and the purpose of internal osmotic crystallization of the concrete is achieved by the generation of the calcium carbonate crystals and the C-S-H gel. The products can improve the compactness of the interior of concrete, thereby preparing the high-performance waterproof and impervious concrete prefabricated part.
The invention fully utilizes the smelting slag; in the process of carbonating and treating the smelting slag, the greenhouse gas CO is introduced2Carrying out permanent sealing; the carbonated product of the smelting slag can wrap the precast concrete component, and meanwhile, the carbonated product can fill cracks and micro cracks in the precast concrete through osmotic crystallization, the compactness of the treated precast concrete component is improved, the impermeability is improved, and the surface hardness of the carbonated product protective layer formed on the surface of the precast concrete component is enhanced. The treatment process can finally improve the durability and the impermeability of the concrete prefabricated part.
Drawings
FIG. 1 is a main process flow diagram of the present invention.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention.
Example 1
The embodiment provides a method for improving the strength and the impermeability of a concrete test block, wherein steel slag is selected as smelting slag, and the specific surface area of the steel slag is 350m after the steel slag is ground2Preparing steel slag powder slurry with a water-cement ratio of 0.8/kg, fixing a concrete test block in a string according to the construction process of the first step, putting the test block into the slurry, soaking for 20min, taking out the test block and putting the test block into a carbonation reaction kettle, and introducing CO with the concentration of 99.9%2Gas pressure of 0.2MPa, and carbonation treatment for 20 min. After treatment, the concrete test block is tested for strength and impermeability, a blank group is set in the experiment, namely the concrete test block which is not treated is tested for strength and impermeability, and the result shows that
Table 1: performance results of examples
| Blank group | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Strength (MPa) | 25.43 | 28.41 | 28.93 | 30.47 | 31.18 | 36.25 | 33.27 |
| Grade of impermeability | P4 | P4 | P4 | P6 | P8 | P10 | P8 |
Example 2
This example provides a method for enhancing the strength of concreteThe method for testing the strength and the impermeability of the test block comprises the steps that steel slag is selected as smelting slag, and the specific surface area of the steel slag after grinding is 350m2Per kg, the water-cement ratio is 0.8, steel slag powder slurry is prepared, the slurry is coated on the periphery of concrete, the coating thickness is 2mm, a test block is placed in a carbonation reaction kettle, and CO with the concentration of 99.9 percent is introduced2Gas pressure of 0.2MPa, and carbonation treatment for 20 min. After treatment, the concrete test block is tested for strength and impermeability, and the results are shown in table 1;
example 3
The embodiment provides a method for improving the strength and the impermeability of a concrete test block, wherein steel slag is selected as smelting slag, and the specific surface area of the steel slag is 400m after the steel slag is ground2Preparing steel slag powder slurry with a water-cement ratio of 0.8/kg, fixing a concrete test block in a string according to the construction process of the first step, putting the test block into the slurry, soaking for 20min, taking out the test block, putting the test block into a carbonation reaction kettle, and introducing CO with the concentration of 99.9%2Gas pressure of 0.2MPa, and carbonation treatment for 20 min. After treatment, the concrete test block was tested for strength and impermeability, and the results are shown in table 1.
Example 4
The embodiment provides a method for improving the strength and the impermeability of a concrete test block, wherein steel slag is selected as smelting slag, and the specific surface area of the steel slag is 400m after the steel slag is ground2Preparing steel slag powder slurry with a water-cement ratio of 0.8/kg, fixing a concrete test block in a string according to the construction process of the first step, putting the test block into the slurry, soaking for 60min, taking out the test block, putting the test block into a carbonation reaction kettle, and introducing CO with the concentration of 99.9%2Gas pressure of 0.2MPa, and carbonation treatment for 20 min. After treatment, the concrete test block is tested for strength and impermeability, and the results are shown in table 1;
example 5
The embodiment provides a method for improving the strength and the impermeability of a concrete test block, wherein steel slag is selected as smelting slag, and the specific surface area of the steel slag is 400m after the steel slag is ground2Preparing steel slag powder slurry with a water-cement ratio of 0.8, fixing a concrete test block in the slurry by a string according to the construction process of the first step, soaking for 60min, taking out, putting the test block in carbonIntroducing CO with the concentration of 99.9 percent into the acidification reaction kettle2Gas pressure of 0.2MPa, and carbonation treatment for 60 min. After treatment, the concrete test block is tested for strength and impermeability, and the results are shown in table 1;
example 6
The embodiment provides a method for improving the strength and the impermeability of a concrete test block, wherein steel slag is selected as smelting slag, and the specific surface area of the steel slag is 400m after the steel slag is ground2Preparing steel slag powder slurry with the water-cement ratio of 1.0/kg, fixing a concrete test block in a string according to the construction process of the first step, putting the test block into the slurry, soaking for 60min, taking out the test block, putting the test block into a carbonation reaction kettle, and introducing CO with the concentration of 50.0 percent2Gas pressure of 0.2MPa, and carbonation treatment for 60 min. After treatment, the concrete test block was tested for strength and impermeability, and the results are shown in table 1.
TABLE 1 Performance results for each example
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of a carbonate coating for protecting a concrete prefabricated part is characterized by comprising the following steps:
the first step is as follows: soaking the concrete prefabricated part in alkaline calcareous material slurry with different fineness or directly coating the slurry on the surface of the concrete prefabricated part, and performing carbonation maintenance to enable smelting slag powder to perform carbonation reaction to form a carbonate coating on the surface of the concrete prefabricated part;
the second step is that: soaking or directly brushing for 5min-3h, taking out, and measuring the thickness of the steel slag slurry coating on the surface of the test piece;
the third step: and (5) placing the treated test piece in a carbonization reaction kettle for carbonation treatment.
2. The method for preparing a carbonate coating for protecting concrete precast elements according to claim 1, wherein the liquid-solid ratio of the alkaline calcareous material slurry is 0.5-1.5.
3. The method for preparing a carbonate coating for protecting a concrete precast element according to claim 1 or 2, wherein the alkaline calcareous materials with different fineness are alkaline calcareous material powder with fineness of more than 300m 2/kg.
4. The method for preparing a carbonate coating for protecting a concrete precast element according to claim 3, wherein the alkaline calcium material powder with the fineness of more than 300m2/kg is mainly composed of calcium oxide, calcium hydroxide, dicalcium silicate, tricalcium silicate and calcium silicate hydrate.
5. The method of claim 1, 2 or 4, wherein the carbonation conditions include carbon dioxide concentration, temperature, humidity, pressure and carbonation time.
6. The method of claim 5, wherein the carbon dioxide concentration is greater than 30% carbon dioxide content of the exhaust gas, flue gas, and the pressure is 1-20 atm. The temperature is 20-80 ℃; the humidity is 60-100 relative humidity; the carbonation time is 3min-120 min.
7. The carbonation conditions according to claim 6 wherein different ratios of alkaline materials are controlled to form a protective layer of calcium carbonate based on calcite or aragonite.
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| CN114394791A (en) * | 2022-02-07 | 2022-04-26 | 武汉理工大学 | Composite porous ceramic decorative plate and preparation method thereof |
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| CN117024177A (en) * | 2023-08-22 | 2023-11-10 | 日照弗尔曼新材料科技有限公司 | Surface reinforcing agent for concrete and preparation method thereof |
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