CN111807791B - Self-healing type cement-based permeable crystallization waterproof coating and preparation method thereof - Google Patents
Self-healing type cement-based permeable crystallization waterproof coating and preparation method thereof Download PDFInfo
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- CN111807791B CN111807791B CN202010737788.XA CN202010737788A CN111807791B CN 111807791 B CN111807791 B CN 111807791B CN 202010737788 A CN202010737788 A CN 202010737788A CN 111807791 B CN111807791 B CN 111807791B
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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
- C04B2111/00482—Coating or impregnation 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
- C04B2111/20—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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Abstract
The invention discloses a self-healing type cement-based permeable crystallization waterproof coating and a preparation method thereof, wherein the self-healing type cement-based permeable crystallization waterproof coating is prepared from the following raw materials in percentage by mass: 35-55% of Portland cement, 30-45% of quartz sand, 5-8% of quick-setting and quick-hardening cement, 4-8% of graphene modified steel slag micro powder, 1-2% of calcium carbonate, 1-1.5% of anhydrous sodium sulphate and 1-2% of core master batch, wherein the core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100 (30-40) to (5-10); 1 to 2 percent of thickening agent, and the total content of the raw materials is 100 percent. The cement-based permeable crystallization waterproof coating has good self-healing performance and low price, and improves the strength and the anti-cracking performance.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of building materials, and particularly relates to a self-healing type cement-based permeable crystallization waterproof coating and a preparation method thereof.
[ background of the invention ]
With the continuous development of the engineering construction in China, the problem of water leakage of corresponding tunnels, underground engineering and houses is endless, and the demand for waterproof materials is continuously increased. At present, the types of waterproof materials in China are complex, the waterproof technology is continuously updated, and common waterproof materials comprise waterproof coiled materials, waterproof coatings, sealing materials, plugging materials and the like. For high-molecular waterproof coiled materials, the defects of poor durability, poor air permeability and the like exist, and for projects with special requirements such as underground waterproof projects and the like, the day and night temperature difference and the four-season temperature difference are large, the temperature adaptability is not strong, and the problems of aging, cracking, breaking, deformation and the like which influence the service life of materials are easily caused. The general polymer is adopted for modification, the defect that common asphalt is used for a high-molecular waterproof coiled material is overcome, and the high-molecular waterproof coiled material has excellent performances of high tensile strength, strong temperature adaptability, high elongation and the like. At present, inorganic waterproof materials still need to be developed vigorously because of the superior environmental protection performance and the good compatibility with the surface of cement concrete.
At present, the cement-based capillary crystalline waterproof coating is mainly adopted as a novel waterproof material, not only belongs to an inorganic waterproof coating system and a cement concrete system, and has great compatibility, but also has excellent waterproof performance, and has the waterproof and anti-permeability effects of the polymer cement mortar waterproof coating with the thickness of 10-20 cm when being coated by 1cm, and has the waterproof and repairing functions on concrete below the coating. However, the core master batch of the cement-based permeable crystallization type waterproof coating is expensive, and the strength of the cement-based material is insufficient. And the novel waterproof material needs to be imported and is expensive. If the coating can be made into a home as early as possible without depending on import and the product price is reduced, the coating is more commonly used in underground construction engineering, is extremely favorable for the development of the building field and has wide potential market prospect.
[ summary of the invention ]
The invention aims to provide a self-healing type cement-based permeable crystallization waterproof coating and a preparation method thereof.
The invention adopts the following technical scheme: the self-healing type cement-based permeable crystallization waterproof coating is prepared from the following raw materials in percentage by mass:
35 to 55 percent of Portland cement,
30 to 45 percent of quartz sand,
5 to 8 percent of quick-setting and quick-hardening cement,
4 to 8 percent of graphene modified steel slag micro-powder,
1 to 2 percent of calcium carbonate,
1 to 1.5 percent of anhydrous sodium sulphate,
1-2% of core master batch, wherein the core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is 100 (30-40) to (5-10);
1 to 2 percent of thickening agent,
the total content of the raw materials is 100 percent.
Further, the graphene-modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is (1-3): 1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, and specific surface area of the steel slag micro powder of 420cm2/g～450cm2/g。
Further, the particle size of the quartz sand is 0.5mm to 4 mm.
Further, the particle size of the calcium carbonate is 400 meshes.
Furthermore, the thickening agent is a mixture of methylcellulose and polypropylene monofilament fibers, and the mass ratio of the methylcellulose to the polypropylene monofilament fibers is (1-3) to (3-1).
Furthermore, the 1-hour compressive strength and the 28-day compressive strength of the quick-setting and quick-hardening cement are 20.3MPa and 60.2MPa respectively.
The invention also discloses a preparation method of the self-healing type cement-based permeable crystallization waterproof coating, which comprises the following steps:
mixing the silicate cement and the quartz sand, and magnetically stirring to obtain a mixture;
adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and magnetically stirring to obtain a premix;
adding anhydrous sodium sulphate, a core master batch and a thickening agent into the premix, and magnetically stirring to obtain the premix.
The invention also discloses a core master batch of the self-healing type cement-based permeable crystallization waterproof coating, which is a mixture of bentonite, citric acid and isobutyl triethoxysilane, wherein the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is 100 (30-40) to (5-10).
The invention has the beneficial effects that: 1. the core master batch is selected from bentonite, citric acid and isobutyl triethoxysilane, so that the cost is low, and the problem that the core master batch and finished products of the existing cement-based permeable crystallization waterproof coating are expensive is solved. 2. The self-healing type cement-based permeable crystallization waterproof coating has good mechanical property and anti-cracking property and strong self-healing capability.
[ detailed description ] embodiments
The invention discloses a self-healing type cement-based permeable crystallization waterproof coating which is prepared from the following raw materials in percentage by mass:
35 to 55 percent of Portland cement,
30 to 45 percent of quartz sand,
5 to 8 percent of quick-setting and quick-hardening cement,
4 to 8 percent of graphene modified steel slag micro-powder,
1 to 2 percent of calcium carbonate,
1 to 1.5 percent of anhydrous sodium sulphate,
1-2% of core master batch, wherein the core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is 100 (30-40) to (5-10);
1 to 2 percent of thickening agent,
the total content of the raw materials is 100 percent.
The graphene-modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is (1-3): 1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, and specific surface area of the steel slag micro powder of 420cm2/g～450cm2/g。
The particle size of the quartz sand is 0.5 mm-4 mm.
The particle size of the calcium carbonate is 400 meshes.
The thickening agent is a mixture of methylcellulose and polypropylene monofilament fibers, and the mass ratio of the methylcellulose to the polypropylene monofilament fibers is (1-3) to (3-1).
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The preparation method of the self-healing type cement-based permeable crystallization waterproof coating is characterized by comprising the following steps of:
mixing the silicate cement and the quartz sand, and magnetically stirring to obtain a mixture;
adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and magnetically stirring to obtain a premix;
adding anhydrous sodium sulphate, a core master batch and a thickening agent into the premix, and magnetically stirring to obtain the premix.
The invention also discloses a core master batch of the self-healing type cement-based permeable crystallization waterproof coating, which is a mixture of bentonite, citric acid and isobutyl triethoxysilane, wherein the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is 100 (30-40) to (5-10).
The present invention will be described in detail with reference to the following embodiments.
Example 1
Taking 100g of the product prepared by the invention as an example, the product is prepared from the following raw materials by mass: 40.9g of Portland cement, 40g of quartz sand, 5g of quick-setting and quick-hardening cement, 8g of graphene modified steel slag micro-powder, 1.5g of calcium carbonate, 1g of anhydrous sodium sulphate, 1.6g of core master batch and 2g of thickening agent.
The Portland cement is 42.5-grade Portland cement. The grain size of the quartz sand is within the range of 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 1:1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, specific surface area of 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:40:10, and the main chemical component of the bentonite is SiO2(60.64％)、Al2O3(20.65％)、Fe2O3(7.49％)、FeO(0.43％)、CaO(1.73％)、MgO(5.74％)、Na2O(0.82％)、K2O(0.56％)、TiO2(0.98%), others (0.96%), particle size 400 mesh.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 2.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 180r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 210r/min to obtain the premix.
And finally, adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, and stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 200r/min to obtain the self-healing type cement-based permeable crystallization waterproof coating.
Example 2
The differences between this example and example 1 are listed below, and the non-listed contents are the same.
Taking 100g of the product of the invention as an example, the product is prepared from the following raw materials by mass: 38.7g of Portland cement, 45g of quartz sand, 7g of quick-setting and quick-hardening cement, 4g of graphene modified steel slag micro-powder, 1g of calcium carbonate, 1.3g of anhydrous sodium sulphate, 1.2g of core master batch and 1.8g of thickening agent.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, and the mass ratio of the graphene to the steel slag micro powder is 2: 1000. The specific surface area of the steel slag micro powder is 450cm2/g。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:35: 5.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 120r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 300r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 320r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Example 3
The differences between this example and example 1 are listed below, and the non-listed contents are the same.
Taking 100g of the product of the invention as an example, the product is prepared from the following raw materials by mass: 55g of portland cement, 30g of quartz sand, 5g of quick-setting and quick-hardening cement, 4.5g of graphene modified steel slag micro powder, 2g of calcium carbonate, 1.2g of anhydrous sodium sulphate, 1g of core master batch and 1.3g of thickening agent.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 3:1000, and the specific surface area of the steel slag micro powder is 420cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:40: 5.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 3: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 100r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 240r/min to obtain the premix.
And finally, adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, and stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 240r/min to obtain the self-healing type cement-based permeable crystallization waterproof coating.
Example 4
The differences between this example and example 1 are listed below, and the non-listed contents are the same.
Taking 100g of the product of the invention as an example, the product is prepared from the following raw materials by mass: 45.5g of Portland cement, 35g of quartz sand, 6g of quick-setting and quick-hardening cement, 7g of graphene modified steel slag micro-powder, 2g of calcium carbonate, 1.5g of anhydrous sodium sulphate, 1.8g of core master batch and 1.2g of thickening agent.
The graphene modified steel slag micropowder is graphene and steel slag micropowderThe mass ratio of the graphene to the steel slag micro powder is 3:1000, and the specific surface area of the steel slag micro powder is 440cm2/g。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:30: 5.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 3.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 160r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 180r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 360r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Example 5
The differences between this example and example 1 are listed below, and the non-listed contents are the same.
Taking 100g of the product of the invention as an example, the product is prepared from the following raw materials by mass: 48g of Portland cement, 35g of quartz sand, 6g of quick-setting and quick-hardening cement, 5g of graphene modified steel slag micro powder, 1g of calcium carbonate, 1.4g of anhydrous sodium sulphate, 2g of core master batch and 1.6g of thickening agent.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 1:1000, and the specific surface area of the steel slag micro powder is 420cm2/g。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:35: 10.
The thickening agent is a mixture of methylcellulose and polypropylene monofilament fibers, and the mass ratio of the methylcellulose to the polypropylene monofilament fibers is 2: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 200r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 150r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 400r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Example 6
The differences between this example and example 1 are listed below, and the non-listed contents are the same.
Taking 100g of the product of the invention as an example, the product is prepared from the following raw materials by mass: 42g of Portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of graphene modified steel slag micro powder, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate, 1.4g of core master batch and 1g of thickening agent.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, and the mass ratio of the graphene to the steel slag micro powder is 2: 1000.
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:40: 5.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Example 7
A core master batch of a self-healing type cement-based permeable crystallization waterproof coating is a mixture of bentonite, citric acid and isobutyl triethoxysilane, wherein the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is (30-40) to (5-10) 100.
Comparative example 1
Taking 100g of product as an example, the product is prepared from the following raw materials by mass: 42g of Portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of steel slag micro-powder, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate, 1.4g of core master batch and 1g of thickening agent.
The Portland cement is 42.5-grade Portland cement.
The particle size of the quartz sand is 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The specific surface area of the steel slag micro powder is 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:40:5, and the main chemical component of the bentonite is SiO2(60.64％)、Al2O3(20.65％)、Fe2O3(7.49％)、FeO(0.43％)、CaO(1.73％)、MgO(5.74％)、Na2O(0.82％)、K2O(0.56％)、TiO2(0.98%), others (0.96%) The granularity is 400 meshes.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Comparative example 2
Taking 100g of product as an example, the product is prepared from the following raw materials by mass: 42g of Portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of graphene, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate, 1.4g of core master batch and 1g of thickening agent.
The Portland cement is 42.5-grade Portland cement.
The particle size of the quartz sand is 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, specific surface area of 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, the mass ratio of the bentonite, the citric acid and the isobutyl triethoxysilane is 100:40:5, and the main chemical component of the bentonite is SiO2(60.64％)、Al2O3(20.65％)、Fe2O3(7.49％)、FeO(0.43％)、CaO(1.73％)、MgO(5.74％)、Na2O(0.82％)、K2O(0.56％)、TiO2(0.98%), others (0.96%), particle size 400 mesh.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, core master batch and thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the self-healing type cement-based permeable crystalline waterproof coating.
Comparative example 3
Taking 100g of product as an example, the product is prepared from the following raw materials by mass: 43.4g of Portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of graphene modified silicon slag powder, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate and 1g of thickening agent.
The Portland cement is 42.5-grade Portland cement.
The particle size of the quartz sand is 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 2:1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, specific surface area of 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SiO4。
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate and a thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the self-healing type cement-based permeable crystallization waterproof coating.
Comparative example 4
Taking 100g of product as an example, the product is prepared from the following raw materials by mass: 43g of portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of graphene modified silica slag powder, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate and 1.4g of core master batch.
The Portland cement is 42.5-grade Portland cement.
The particle size of the quartz sand is 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 2:1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, specific surface area of 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulfate contains Na as main chemical component2SO4。
The core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the bentonite, the citric acid and the isobutyl triethoxysilaneThe mass ratio of the triethoxy silane is 100:40:5, and the main chemical component of the bentonite is SiO2(60.64％)、Al2O3(20.65％)、Fe2O3(7.49％)、FeO(0.43％)、CaO(1.73％)、MgO(5.74％)、Na2O(0.82％)、K2O(0.56％)、TiO2(0.98%), others (0.96%), particle size 400 mesh.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate and the core master batch into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the self-healing type cement-based permeable crystallization waterproof coating.
Comparative example 5
In this comparative example, the core masterbatch was purchased externally, and prepared from the following raw materials by mass, taking 100g of the product as an example: 42g of portland cement, 40g of quartz sand, 7g of quick-setting and quick-hardening cement, 6g of graphene modified silica slag powder, 1.5g of calcium carbonate, 1.1g of anhydrous sodium sulphate, 1.4g of core master batch and 1g of thickening agent.
The Portland cement is 42.5-grade Portland cement.
The particle size of the quartz sand is 0.5 mm-4 mm.
The 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
The graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is 2:1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7% and an electrical conductivity of 106S/m, thermal conductivity of 5000W/m.k, specific surface area of 430cm2/g。
The particle size of the calcium carbonate is 400 meshes.
The anhydrous sodium sulphateHas a main chemical component of Na2SO4。
The core master batch is purchased from a waterproof material company Limited.
The thickening agent is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of the methyl cellulose to the polypropylene monofilament fibers is 1: 1.
Firstly, stirring the Portland cement and the quartz sand for 15min by using a magnetic stirrer with the rotating speed of 140r/min at room temperature to obtain a mixture.
And secondly, adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and stirring for 15min at room temperature by using a magnetic stirrer with the rotating speed of 270r/min to obtain the premix.
And finally, after adding anhydrous sodium sulphate, the core master batch and the thickening agent into the premix, stirring for 10min at room temperature by using a magnetic stirrer with the rotating speed of 280r/min to obtain the premix.
The self-healing type cement-based permeable crystallization waterproof coating prepared in the embodiments 1 to 6 and the comparative examples 1 to 5 has the following performance detection process:
the performance of the self-healing type cement-based infiltration crystallization waterproof coating is tested according to JC900-2002 and GB 18445-2012.
TABLE 1 Performance of self-healing Cement-based osmotically crystalline waterproofing coatings
The data in table 1 show that the stability of the products in each example and comparative example is acceptable, but the comparative standard of examples 1 to 6 using the method of the present invention is the compressive strength of the first consideration compared with comparative examples 1 to 5, and on the premise that the compressive strength is acceptable, the products prepared by the method of the present invention have better permeation resistance pressure than the comparative examples, better wet base bonding strength than the comparative examples, and good permeation resistance pressure, and the self-healing ability of the waterproof coating is good. Comparing example 1 with comparative example 5, the 28d pack pressure increase was 0.3MPa and the 56d pack pressure increase was 0.3MPa, which is a very good value in the industry because the 28d pack pressure increase was 15%; the 56d impervious pressure increased by 16.7%.
From the performances of the products in comparative examples 1 to 4, the graphene, the steel slag micropowder, the core master batch and the thickening agent in the invention can improve the 28d flexural strength, 28d compressive strength, 28d permeation resistance pressure, 56d permeation resistance pressure and wet base surface bonding strength.
Compared with the comparative example 1 and each example, the compressive strength of the waterproof material can be improved by adding the graphene. From comparative example 3 and comparison of each example and comparative example, the core masterbatch determines the permeation resistance pressure of the waterproof material.
In addition, under the selected stirring speed, the waterproof coating is uniformly and effectively mixed, but the performance of the waterproof coating is not greatly influenced by different stirring speeds.
The self-healing type cement-based permeable crystallization waterproof coating is theoretically analyzed, and comprises the following steps:
(1) the mineral composition of the steel slag mainly comprises tricalcium silicate, dicalcium silicate, RO phase, dicalcium ferrite and free calcium oxide, the performance of the steel slag belongs to over-fired portland cement, the hydration effect in the later stage is obviously reacted with anhydrous sodium sulphate, methylcellulose and polypropylene monofilament fiber, the mechanical property and the anti-cracking performance in the later stage of hydration are improved, and the purpose of self-healing is achieved.
(2) The main chemical component of anhydrous sodium sulphate is Na2SO4As an active substance, a part of anhydrous sodium sulphate and calcium ions of the calcium carbonate and graphene modified steel slag micro powder are subjected to chemical reaction to generate insoluble crystals, so that the mechanical property is improved; citric acid and isobutyl triethoxy silicon in the core master batch are subjected to a complex reaction with calcium ions of calcium carbonate and graphene modified steel slag micro powder to generate a soluble complex, and the soluble complex and the other part of anhydrous sodium sulphate are subjected to an ion exchange reaction to generate an insoluble crystal, so that the cracking resistance is improved; the last part of anhydrous sodium sulphate reacts with methyl cellulose and polypropylene monofilament fiber in the thickening agent to generate a cross-linked reticular silica gel elastomer, so that the internal stress capability is improved.
(3) GrapheneHas an ultra-large specific surface area (2630 m)2/g), excellent light transmission (97.7%), very high conductivity (10)6S/m), ultra-high thermal conductivity (5000W/m.k), and ultra-high hardness. The ultra-large specific surface area and the ultra-strong hardness of the graphene can promote the dispersibility of the steel slag micro powder in a system, and are favorable for improving the adhesive force performance, the anti-cracking performance and the internal stress capability.
(4) Bentonite rich in SiO2With Al2O3On one hand, the material can be continuously and uniformly hydrated with Portland cement to produce a substance with expansibility, and the effect of compensating shrinkage can be achieved; on the other hand, the adhesive participates in the cementation of the cementing material, and the compactness is improved, so that the mechanical property is improved; and simultaneously, the mortar can perform secondary reaction with a hydration product of portland cement to generate hydrophobic crystalline substances to plug holes and seams, so that the compactness and the self-healing performance of the seams are further improved.
Claims (6)
1. The self-healing type cement-based permeable crystallization waterproof coating is characterized by being prepared from the following raw materials in percentage by mass:
35 to 55 percent of Portland cement,
30 to 45 percent of quartz sand,
5 to 8 percent of quick-setting and quick-hardening cement,
4 to 8 percent of graphene modified steel slag micro-powder,
1 to 2 percent of calcium carbonate,
1 to 1.5 percent of anhydrous sodium sulphate,
1-2% of core master batch, wherein the core master batch is a mixture of bentonite, citric acid and isobutyl triethoxysilane, and the mass ratio of the bentonite to the citric acid to the isobutyl triethoxysilane is 100 (30-40) to (5-10);
1 to 2 percent of thickening agent,
the total content of the raw materials is 100 percent;
the graphene modified steel slag micro powder is a mixture of graphene and steel slag micro powder, the mass ratio of the graphene to the steel slag micro powder is (1-3): 1000, and the specific surface area of the graphene is 2630m2A light transmittance of 97.7%, and conductivityProperty of 106S/m, thermal conductivity of 5000W/m.k, and specific surface area of the steel slag micro powder of 420cm2/g～450cm2/g。
2. A self-healing type cement-based permeable crystallization waterproof coating according to claim 1, wherein the particle size of the quartz sand is 0.5mm to 4 mm.
3. A self-healing cement-based infiltration crystalline waterproofing paint according to claim 2, wherein the particle size of the calcium carbonate is 400 mesh.
4. A self-healing type cement-based permeable crystallization waterproof coating according to claim 3, characterized in that the thickener is a mixture of methylcellulose and polypropylene monofilament fiber, and the mass ratio of methylcellulose to polypropylene monofilament fiber is (1-3) to (3-1).
5. A self-healing type cement-based permeable crystallization waterproof coating according to claim 4, characterized in that the 1-hour compressive strength of the quick-setting and quick-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2 MPa.
6. A method for preparing a self-healing type cement-based infiltration crystalline waterproof coating according to any one of claims 1 to 5, characterized by comprising the steps of:
mixing the silicate cement and the quartz sand, and magnetically stirring to obtain a mixture;
adding the quick-setting and quick-hardening cement, the graphene modified steel slag micro powder and the calcium carbonate into the mixture, and magnetically stirring to obtain a premix;
adding anhydrous sodium sulphate, a core master batch and a thickening agent into the premix, and magnetically stirring to obtain the premix.
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