CN112723805A - Environment-friendly cement facing mortar and preparation method thereof - Google Patents

Environment-friendly cement facing mortar and preparation method thereof Download PDF

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Publication number
CN112723805A
CN112723805A CN202110165941.0A CN202110165941A CN112723805A CN 112723805 A CN112723805 A CN 112723805A CN 202110165941 A CN202110165941 A CN 202110165941A CN 112723805 A CN112723805 A CN 112723805A
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parts
environment
friendly cement
facing mortar
mortar
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郑小燕
季韬
杨锦湖
游生洁
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Fujian Agriculture and Forestry University
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Fujian Agriculture and Forestry University
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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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • 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
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant 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
    • C04B2111/80—Optical properties, e.g. transparency or reflexibility
    • C04B2111/82—Coloured 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • 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

Abstract

The invention discloses environment-friendly cement facing mortar and a preparation method thereof, wherein the environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: 4-6 parts of sodium carbonate, 2-3 parts of calcium oxide, 50-60 parts of slag, 80-100 parts of quartz sand, 20-40 parts of colored sand, 12-14 parts of 5A zeolite, 0.6-0.8 part of nanocellulose, 3-5 parts of carbon nitride nanosheet, 2-4 parts of PTB emulsion and 30-34 parts of water. The environment-friendly cement used by the invention can effectively inhibit the efflorescence of the environment-friendly cement due to the addition of the 5A zeolite, and the nanocellulose and the PTB emulsion can improve the working performance of the facing mortar, enhance the strength and the bonding performance, reduce the self-shrinkage, improve the crack resistance, the durability and the like. The invention meets the aesthetic feeling of people, ensures the environmental protection and durability of materials, optimizes the defects of environment-friendly cement, and realizes the application of the environment-friendly cement in facing mortar.

Description

Environment-friendly cement facing mortar and preparation method thereof
Technical Field
The invention belongs to the technical field of engineering building materials, and particularly relates to environment-friendly cement facing mortar and a preparation method thereof.
Background
The facing mortar consists of inorganic cementing material, stuffing, additive and aggregate, is used in building surface and ceiling decoration, has the features of high compatibility with outer wall, simple construction, low cost, high durability, etc. and has great development potential in outer wall decoration. However, the inorganic cementing materials used in the existing facing mortar are mainly portland cement, which causes problems of saltpetering, shrinkage cracking, pollution resistance and the like in the facing mortar, and the production of portland cement needs to consume a large amount of energy and discharge a large amount of carbon dioxide, so that the development demand of the facing mortar cannot be met by the portland cement, and the search for suitable cementing materials becomes a research hotspot.
The environment-friendly cement is also called alkali-activated cement, is a cementing material prepared by mixing an alkali activator and blast furnace slag, can fully utilize solid wastes, has the advantages of high strength, strong corrosion resistance, good impermeability and the like, and is one of the best choices for replacing common portland cement. Meanwhile, with the increase of age, the environment-friendly cement forms calcium carbonate on the surface and presents a white appearance, which is contrary to the white substrate required by facing mortar. However, alkali excitation still faces the problems of large shrinkage, easy efflorescence, fast coagulation and the like. Therefore, the problems of the environment-friendly cement are solved, the environment-friendly cement can be applied to facing mortar, and the development trend of environment friendliness is met.
Chinese patent of patent CN110436860A discloses a high belite cement facing mortar and a manufacturing method and application thereof. This facing mortar uses white high belite cement as cementitious material, but high belite cement production technology is complicated, and is with high costs, and its early strength and durability can not reach the environmental protection cement that this patent used, and this facing mortar receives pollutants such as organic matter, dust easily to cover, influences the decorative effect of facing mortar, and the facing mortar of this patent has self-cleaning performance, and the pollutant can decompose under photocatalytic material's effect, guarantees the clean and tidy on facing mortar surface.
Chinese patent of patent CN110171945A discloses a self-cleaning high crack resistance self-leveling facing mortar and a manufacturing method and application thereof. The self-cleaning performance of the facing mortar is realized by using nano titanium dioxide, but the self-cleaning performance of the facing mortar can be photocatalytic only under the condition of solar illumination, and the carbon nitride nanosheet used in the facing mortar can be oxidized and degrade pollutants under the condition of lamplight illumination. Simultaneously, this facing mortar improves the intensity of facing mortar through alkali-resistant glass fiber and reduces the shrink fracture, and the nano cellulose that this patent used is higher than alkali-resistant glass fiber at the efficiency that improves intensity and reduce the shrink fracture, and nano cellulose can improve the working property of facing mortar, refines the pore structure, improves alkali-efflorescence resistance and durability etc..
Disclosure of Invention
The invention aims to provide environment-friendly cement facing mortar and a preparation method thereof aiming at the defects of the prior art. By using the environment-friendly cement as the cementing material of the facing mortar, the production cost is reduced, and the concept of green and environment-friendly development is practiced. Meanwhile, the possibility that the environment-friendly cement is used as a facing mortar cementing material is realized by adding the additive, and the working performance, the strength, the saltpetering resistance, the impermeability, the durability and the like of the facing mortar are improved. Similarly, the facing mortar of this patent possesses photocatalysis and automatically cleaning performance, both air-purifying, can keep the clean and tidy of surface again.
In order to achieve the purpose, the invention adopts the following technical scheme:
the environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 4-6 parts of calcium oxide (CaO), 2-3 parts of slag, 50-60 parts of slag, 80-100 parts of quartz sand, 20-40 parts of colored sand, 12-16 parts of 5A zeolite, 0.6-0.8 part of nanocellulose and carbon nitride nanosheet (g-C)3N4) 3-5 parts of PTB emulsion, 2-4 parts of PTB emulsion and 30-34 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The 5A zeolite has excellent calcium-sodium ion exchange property, and specific surface area of 1145 m2In terms of/kg. The nano-cellulose is a cellulose nanocrystal, has an average diameter of 20 nm and a length of 100 nm-1 mu m, and has the characteristics of high tensile strength, high elastic modulus, large specific surface area, good water absorption and water return performance and the like. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant, is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano-cellulose and nano-carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano-suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Compared with the prior art, the invention has the following advantages:
(1) good environmental protection and low production cost. The environment-friendly cement is used as a cementing material, so that the requirements (white color, strength, durability and the like) of facing mortar are met, and solid wastes are used, so that the green development of the field of facing mortar materials is promoted; meanwhile, the activator is prepared from calcium oxide and sodium carbonate, and compared with the traditional activator (sodium hydroxide and water glass), the activator has the advantages of wide material source, low production cost, weak alkalinity, simplicity and safety in construction and the like.
(2) Good working performance. The environmental protection cement that this patent used, because hydration needs water and calcium oxide reaction to generate calcium hydroxide in earlier stage, the calcium hydroxide that generates reacts with sodium carbonate again and generates sodium hydroxide, arouse the slay, add nano cellulose, utilize its water retention and high viscosity, reduce the water yield of earlier stage and calcium oxide reaction, reduce the ion diffusion, delayed early cement hydration, improve the fast problem of environmental protection cement coagulation, and improved the cohesiveness and the water retention of facing mortar, reduce facing mortar bleeding.
(3) The mechanical property is good. According to the preparation method, the nanocellulose is added into the facing mortar, and the tensile property and the compressive property of the facing mortar are obviously improved by utilizing the characteristics of the nanocellulose, such as high tensile strength, high elastic modulus, large specific surface area, nano effect and the like.
(4) Small self-contraction and good crack resistance. The PTB emulsion and the nano-cellulose added in the mortar act together to form a space network structure in the mortar, so that the formation and development of micro-cracks are inhibited, internal curing can be formed in the cement by the nano-cellulose, the self-shrinkage of the mortar is further reduced, and the anti-cracking performance is improved.
(5) Low efflorescence and high impermeability. According to the method, the sodium ion concentration is reduced by utilizing the excellent calcium and sodium ion exchange property function of the 5A zeolite, and the nanocellulose is added, so that the effect of refining the pore structure of the environment-friendly cement is achieved, the alkali metal ions and the water are further prevented from migrating to the surface of the mortar, the 5A zeolite and the nanocellulose are matched with each other, the efflorescence on the surface of the mortar is obviously reduced, and the impermeability is improved.
(6) Good bonding strength. The added PTB emulsion is a special plastic dispersant, has good waterproof, bonding, heat-resistant, anti-corrosion, anti-freezing and anti-cracking performances, and improves the bonding strength of the surface interface of the facing mortar and the building wall.
(7) Good photocatalytic and self-cleaning properties. Due to the addition of the carbon nitride nanosheets, pollutants on the surface of the facing mortar are subjected to oxidative degradation under the irradiation of visible light and are carried away from the surface of the mortar along with rainwater scouring, so that the functions of air purification and self-cleaning are realized, and the cleanness and tidiness of the surface of the mortar are kept.
Detailed Description
The environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 4-6 parts of calcium oxide (CaO), 2-3 parts of slag, 50-60 parts of slag, 80-100 parts of quartz sand, 20-40 parts of colored sand, 12-16 parts of 5A zeolite, 0.6-0.8 part of nanocellulose and carbon nitride nanosheet (g-C)3N4) 3-5 parts of PTB emulsion, 2-4 parts of PTB emulsion and 30-34 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The 5A zeolite has excellent calcium-sodium ion exchange property, and specific surface area of 1145 m2In terms of/kg. The nano-cellulose is a cellulose nanocrystal, has an average diameter of 20 nm and a length of 100 nm-1 mu m, and has the characteristics of high tensile strength, high elastic modulus, large specific surface area, good water absorption and water return performance and the like. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant, is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano-cellulose and nano-carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano-suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Example 1
The environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 4 parts of calcium oxide (CaO) 2 parts, 50 parts of slag, 80 parts of quartz sand, 40 parts of colored sand, 12 parts of 5A zeolite, 0.6 part of nano-cellulose and carbon nitride nanosheet (g-C)3N4) 3 parts of PTB emulsion, 2 parts of PTB emulsion and 30 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The 5A zeolite has excellent calcium-sodium ion exchange property, and specific surface area of 1145 m2In terms of/kg. The nano-cellulose is a cellulose nanocrystal, has an average diameter of 20 nm and a length of 100 nm-1 mu m, and has the characteristics of high tensile strength, high elastic modulus, large specific surface area, good water absorption and water return performance and the like. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant, is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano-cellulose and nano-carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano-suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Detecting according to the method for detecting water consumption, setting time and stability of standard consistency of cement (GB/T1346-2011), wherein the initial setting time is 115 min, and the final setting time is 180 min; the detection is carried out according to a cement mortar strength detection method (GB/T17671-2011), the compressive strength is 43 MPa, and the breaking strength is 9.2 MPa; the tensile bonding strength is 2.0 MPa according to the standard of building mortar basic performance test method (JGJ/T70-2009); the detection is carried out according to the photocatalytic air purification material performance test method (GB/T23761-2009), and the NO removal efficiency is 0.40 mu mol g-1 h-1(ii) a The detection is carried out according to wall facing mortar (JC/T1024- & 207), the alkali resistance is alkali efflorescence-free, powder falling-free and the pollution resistance is 0 grade; the cracking index is 70 percent according to the test method for the drying shrinkage cracking performance of cement mortar and concrete (GB/T29417-.
Example 2
The environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 5 parts of calcium oxide (CaO) 2.5 parts, 55 parts of slag, 90 parts of quartz sand, 30 parts of colored sand, 14 parts of 5A zeolite, 0.7 part of nano-cellulose and carbon nitride nanosheet (g-C)3N4) 4 parts of PTB emulsion, 3 parts of PTB emulsion and 32 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The 5A zeoliteHas excellent calcium-sodium ion exchange property and specific surface area of 1145 m2In terms of/kg. The nano-cellulose is a cellulose nanocrystal, has an average diameter of 20 nm and a length of 100 nm-1 mu m, and has the characteristics of high tensile strength, high elastic modulus, large specific surface area, good water absorption and water return performance and the like. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant, is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano-cellulose and nano-carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano-suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Detecting according to the method for detecting water consumption, setting time and stability of standard consistency of cement (GB/T1346-2011), wherein the initial setting time is 130 min, and the final setting time is 200 min; the detection is carried out according to a cement mortar strength detection method (GB/T17671-2011), the compressive strength is 45 MPa, and the breaking strength is 9.8 MPa; the tensile bonding strength is 2.2 MPa according to the standard of building mortar basic performance test method (JGJ/T70-2009); the detection is carried out according to a photocatalytic air purification material performance test method (GB/T23761-2009), and the NO removal efficiency is 0.43 mu mol g-1 h-1(ii) a The detection is carried out according to wall facing mortar (JC/T1024- & 207), the alkali resistance is alkali efflorescence-free, powder falling-free and the pollution resistance is 0 grade; the cracking index is 66 percent according to the test method for the drying shrinkage cracking performance of cement mortar and concrete (GB/T29417-.
Example 3
The environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 6 parts of calcium oxide (CaO) 3 parts, slag 60 parts, quartz sand 100 parts, color sand 20 parts, 5A zeolite 16 parts, nano-cellulose 0.8 parts, and carbon nitride nanosheet (g-C)3N4) 5 parts of PTB emulsion, 4 parts of PTB emulsion and 34 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The 5A zeolite has excellent calcium-sodium ion exchange property, and specific surface area of 1145 m2In terms of/kg. The nano-cellulose is a cellulose nanocrystal, has an average diameter of 20 nm and a length of 100 nm-1 mu m, and has the characteristics of high tensile strength, high elastic modulus, large specific surface area, good water absorption and water return performance and the like. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant, is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano-cellulose and nano-carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano-suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Detecting according to the method for detecting water consumption, setting time and stability of standard consistency of cement (GB/T1346-2011), wherein the initial setting time is 140 min, and the final setting time is 220 min; the detection is carried out according to a cement mortar strength detection method (GB/T17671-2011), the compressive strength is 48 MPa, and the breaking strength is 10.3 MPa; the tensile bonding strength is 2.5 MPa according to the standard of building mortar basic performance test method (JGJ/T70-2009); the detection is carried out according to the photocatalytic air purification material performance test method (GB/T23761-2009), and the NO removal efficiency is 0.46 mu mol g-1 h-1(ii) a The detection is carried out according to wall facing mortar (JC/T1024- & 207), the alkali resistance is alkali efflorescence-free, powder falling-free and the pollution resistance is 0 grade; the cracking index is 62 percent according to the test method for the drying shrinkage cracking performance of cement mortar and concrete (GB/T29417-.
Comparative example 1
The environment-friendly cement facing mortar is prepared from the following raw materials in parts by weight: sodium carbonate (Na)2CO3) 4 parts of calcium oxide (CaO), 2 parts of slag, 50 parts of quartz sand, 40 parts of color sand and carbon nitride nanosheet (g-C)3N4) 3 parts of PTB emulsion, 2 parts of PTB emulsion and 28 parts of water.
The sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO. The slag is S95 level granulated blast furnace slag powder. The fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm. The average thickness of the carbon nitride nanosheet is 5 nm, and the carbon nitride nanosheet has good functions of air purification, pollution prevention, sterilization, ultraviolet aging resistance and the like. The PTB emulsion is a special plastic dispersant,is an ethylene-vinyl chloride-vinyl ester product, in the form of a white emulsion; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7-9; it is stable, white, elastic, and suitable for cement, mortar and other hydraulic material.
The preparation method of the environment-friendly cement facing mortar comprises the following steps:
1) uniformly and dryly mixing sodium carbonate, calcium oxide and slag to form a dry mixed powder material;
2) dispersing nano carbon nitride in mixing water, and performing ultrasonic dispersion treatment to form a nano suspension;
3) mixing the nano suspension in the step 2) and the required PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar with good working performance.
Detecting according to the method for detecting water consumption, setting time and stability of standard consistency of cement (GB/T1346-2011), wherein the initial setting time is 85 min, and the final setting time is 130 min; the detection is carried out according to a cement mortar strength detection method (GB/T17671-2011), the compressive strength is 42 MPa, and the breaking strength is 8.1 MPa; the tensile bonding strength is 1.8 MPa according to the standard of building mortar basic performance test method (JGJ/T70-2009); the detection is carried out according to a photocatalytic air purification material performance test method (GB/T23761-2009), and the NO removal efficiency is 0.41 mu mol g-1 h-1(ii) a The detection is carried out according to wall facing mortar (JC/T1024- & 207), the alkali efflorescence resistance is slight efflorescence, the powder falling is slight, and the pollution resistance is 0 grade; the cracking index is 75 percent according to the test method for the drying shrinkage cracking performance of cement mortar and concrete (GB/T29417-.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (9)

1. The utility model provides an environmental protection cement veneer mortar which characterized in that: the traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 4-6 parts of sodium carbonate, 2-3 parts of calcium oxide, 50-60 parts of slag, 80-100 parts of quartz sand, 20-40 parts of colored sand, 12-16 parts of 5A zeolite, 0.6-0.8 part of nanocellulose, 3-5 parts of carbon nitride nanosheet, 2-4 parts of PTB emulsion and 30-34 parts of water.
2. The environment-friendly cement facing mortar of claim 1, wherein: the sodium carbonate is analytically pure Na2CO3(ii) a Calcium oxide was analytically pure CaO.
3. The environment-friendly cement facing mortar of claim 1, wherein: the slag is S95 level granulated blast furnace slag powder.
4. The environment-friendly cement facing mortar of claim 1, wherein: the fineness of the quartz sand is 0.25-0.80 mm; the color sand is natural color sand with the fineness of 0.25-0.80 mm.
5. The environment-friendly cement facing mortar of claim 1, wherein: the specific surface area of the 5A zeolite is 1145 m2/kg。
6. The environment-friendly cement facing mortar of claim 1, wherein: the nano-cellulose is a cellulose nanocrystal with the average diameter of 20 nm and the length of 100 nm-1 μm.
7. The environment-friendly cement facing mortar of claim 1, wherein: the average thickness of the carbon nitride nanosheet is 5 nm.
8. The environment-friendly cement facing mortar of claim 1, wherein: the PTB emulsion is an ethylene-vinyl chloride-vinyl ester product and is in a white emulsion state; the physical property indexes are viscosity: 80-120 MPa · s, solid content: 52. + -. 1wt%, specific gravity: 1.1, pH value: 7 to 9.
9. A method for preparing the environment-friendly cement finishing mortar as defined in any one of claims 1 to 8, wherein: the method comprises the following steps:
1) uniformly dry-mixing sodium carbonate, calcium oxide, slag and 5A zeolite to form a dry mixed powder;
2) dispersing nano cellulose and carbon nitride nanosheets in water, and performing ultrasonic dispersion treatment to form a nano suspension;
3) mixing the nano suspension liquid in the step 2) and the PTB emulsion into solution A;
4) fully mixing the dry mixed powder, the quartz sand and the color sand in the step 1), stirring for 2 min, then adding the solution A in the step 3), fully mixing, and uniformly stirring to obtain the environment-friendly cement facing mortar.
CN202110165941.0A 2021-02-07 2021-02-07 Environment-friendly cement facing mortar and preparation method thereof Withdrawn CN112723805A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698153A (en) * 2021-09-16 2021-11-26 湖北三棵树新材料科技有限公司 Preparation method of interior wall ecological facing mortar
CN114873957A (en) * 2022-05-10 2022-08-09 福建工程学院 Waterproof and antibacterial environment-friendly slag soil brick and preparation method thereof
CN114920507A (en) * 2022-06-20 2022-08-19 中南林业科技大学 Tough formaldehyde-removing geopolymer-based ecological plate and preparation method thereof
CN115572132A (en) * 2022-10-18 2023-01-06 陕西智诚旭隆智造有限公司 Anti-corrosion PHC pipe pile and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698153A (en) * 2021-09-16 2021-11-26 湖北三棵树新材料科技有限公司 Preparation method of interior wall ecological facing mortar
CN114873957A (en) * 2022-05-10 2022-08-09 福建工程学院 Waterproof and antibacterial environment-friendly slag soil brick and preparation method thereof
CN114920507A (en) * 2022-06-20 2022-08-19 中南林业科技大学 Tough formaldehyde-removing geopolymer-based ecological plate and preparation method thereof
CN115572132A (en) * 2022-10-18 2023-01-06 陕西智诚旭隆智造有限公司 Anti-corrosion PHC pipe pile and preparation method thereof

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Application publication date: 20210430