CN114349458A - Environment-friendly plastering mortar and preparation method thereof - Google Patents
Environment-friendly plastering mortar and preparation method thereof Download PDFInfo
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- CN114349458A CN114349458A CN202210111452.1A CN202210111452A CN114349458A CN 114349458 A CN114349458 A CN 114349458A CN 202210111452 A CN202210111452 A CN 202210111452A CN 114349458 A CN114349458 A CN 114349458A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
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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
- C04B2111/40—Porous or lightweight 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
- C04B2111/52—Sound-insulating 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses environment-friendly plastering mortar and a preparation method thereof. The environment-friendly plastering mortar comprises the following components in parts by weight: 20-30 parts of modified phosphogypsum, 15-20 parts of cement, 5-10 parts of fly ash, 5-5.5 parts of silicon dioxide, 30-35 parts of slag, 15-20 parts of machine-made sand, 0.8-1.2 parts of sodium hydroxide and 5-10 parts of a composite additive; the raw materials of the improved phosphogypsum comprise (3.5-3.8) by weight: 1 phosphogypsum and calcium oxide; the improved phosphogypsum is prepared by the following method: mixing the phosphogypsum and the calcium oxide uniformly, standing for 3-4h, calcining for 4-4.5h at the temperature of 450-. The invention discloses environment-friendly plastering mortar and a preparation method thereof, which are used for improving the early strength of the plastering mortar by using phosphogypsum, thereby being environment-friendly and saving resources and cost.
Description
Technical Field
The invention relates to the technical field of green building materials, in particular to environment-friendly plastering mortar and a preparation method thereof.
Background
At present, most of phosphogypsum in China is treated by two modes of open-air stacking and dumping into the sea, the stacked phosphogypsum slag exceeds 3 hundred million tons, not only occupies a large amount of land, but also contains impurities such as phosphorus, fluorine and the like and seriously harms the ecological environment such as surrounding atmosphere, soil, underground water and the like. In order to improve the resource waste utilization of the phosphogypsum and solve the problems of land occupation and environment pollution of the phosphogypsum, the phosphogypsum is often used in gypsum plastering mortar at present, so that the environmental protection problem of phosphate fertilizer development is broken through.
Because the main component of the phosphogypsum is calcium sulfate dihydrate, and the phosphogypsum also contains a plurality of harmful impurities such as soluble phosphorus, eutectic phosphorus, fluoride ions, organic matters and the like, when the phosphogypsum is applied to plastering mortar, the soluble phosphorus in the phosphogypsum can prolong the setting time of a cementing material and delay the strength development of the cementing material. The soluble fluorine can shorten the setting time, reduce the strength and influence the hardening performance of the cementing material. And soluble phosphorus and soluble fluorine impurities can react with alkaline substances to generate insoluble substances which cover the surfaces of the particles, so that the solubility is influenced, the hydration rate is reduced, and the early strength is influenced.
In combination with the technical problems, an environment-friendly plastering mortar with high early strength needs to be researched, a technical approach is provided for resource utilization of phosphogypsum, a resource and large-scale comprehensive utilization technology of phosphogypsum is developed, and the environment-friendly plastering mortar has great significance for utilization of industrial solid wastes and protection of ecological environment.
Disclosure of Invention
The invention discloses environment-friendly plastering mortar and a preparation method thereof, which are used for improving the early strength of the plastering mortar by using phosphogypsum, thereby being environment-friendly and saving resources and cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the environment-friendly plastering mortar comprises the following components in parts by weight: 20-30 parts of modified phosphogypsum, 15-20 parts of cement, 5-10 parts of fly ash, 5-5.5 parts of silicon dioxide, 30-35 parts of slag, 15-20 parts of machine-made sand, 0.8-1.2 parts of sodium hydroxide and 5-10 parts of a composite additive;
the raw materials of the improved phosphogypsum comprise (3.5-3.8) by weight: 1 phosphogypsum and calcium oxide;
the improved phosphogypsum is prepared by the following method: mixing the phosphogypsum and the calcium oxide uniformly, standing for 3-4h, calcining for 4-4.5h at the temperature of 450-.
Furthermore, the grain diameter of the machine-made sand is in a continuous gradation within the range of 0-2.36mm, and the fineness modulus is distributed between 1.8-2.
Further, the machine-made sand comprises 15-20 parts by weight of 0-0.015mm size fraction, 20-25 parts by weight of 0.015-0.03mm size fraction, 30-35 parts by weight of 0.03-1.18mm size fraction and 20-25 parts by weight of 1.18-2.36mm size fraction.
Further, the composite additive is at least one of silicon steel element, carboxymethyl cellulose, melamine formaldehyde resin, sodium citrate, polycarboxylic acid water reducing agent and aluminum potassium sulfate.
Further, the composite admixture comprises the following components in a weight ratio of 2.5: 0.5: 20: 0.2: (0.5-1): (0.5-1) silicon cellulose, carboxymethyl cellulose, melamine formaldehyde resin, sodium citrate, polycarboxylic acid water reducing agent and aluminum potassium sulfate.
Further, the specific surface area of the improved phosphogypsum is 600-650m2Per Kg; the specific surface area of the slag is 550-600m2/Kg
Further, the fineness of the modified gypsum is 180-200 meshes.
A preparation method of environment-friendly plastering mortar comprises the following steps:
s1: uniformly mixing the improved phosphogypsum, cement, fly ash, silicon dioxide, slag, machine-made sand and sodium hydroxide;
s2: adding the composite admixture into the mixture prepared in the step S1 and uniformly mixing.
Further, the processing time in step S1 is 5-5.5 min; in step S2, the processing time is 10-10.5min, and the rotating speed is 25-30 r/min.
The invention discloses an environment-friendly plastering mortar and a preparation method thereof, and the environment-friendly plastering mortar has the beneficial effects that:
1. the early-strength environment-friendly plastering mortar is prepared by improving the phosphogypsum and utilizing raw materials such as slag, machine-made sand and the like. The early-strength plastering mortar is prepared by optimizing machine-made sand gradation, improving the phosphogypsum and using a composite additive, and the mortar material with excellent pore structure is obtained by determining a reasonable mixing process and has good functions of gas adsorption, sound insulation and noise reduction.
2. The environment-friendly plastering mortar prepared by the method has high early strength which can reach 2MPa in a short time, and the prepared environment-friendly plastering mortar has reasonable pore structure distribution and more micro pores, can adsorb harmful gas and has a certain heat preservation function.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Preparation examples of starting materials and intermediates
Preparation of modified phosphogypsum
Preparation example 1 of modified phosphogypsum: uniformly mixing 3.5kg of phosphogypsum and 1kg of calcium oxide, standing for 3h at 25 ℃, calcining the mixture after standing for 4h at 450 ℃, and then grinding to obtain improved gypsum; the fineness of the modified gypsum is 180-200 meshes, and the specific surface area of the modified gypsum is 630m2/Kg。
Comparative preparation example 1 of modified phosphogypsum: based on the modified phosphogypsum preparation example 1, the only difference from the modified phosphogypsum preparation example 1 is that no calcium oxide activation is used.
Comparative preparation example 2 of modified phosphogypsum: uniformly mixing 3.5kg of phosphogypsum and 0.8kg of calcium oxide, standing for 3h at 25 ℃, calcining the mixture after standing for 4h at 450 ℃, and then grinding to obtain improved gypsum; the fineness of the modified gypsum is 180-200 meshes.
Comparative preparation example 3 of modified phosphogypsum: based on the preparation example 1 of the modified phosphogypsum, the modified phosphogypsum is only different from the preparation example 1 of the modified phosphogypsum in that the fineness of the modified gypsum is 100 meshes.
Comparative preparation example 4 of modified phosphogypsum: based on the preparation example 1 of the modified phosphogypsum, the modified phosphogypsum is only different from the preparation example 1 of the modified phosphogypsum in that the fineness of the modified gypsum is 300 meshes.
Preparation example of machine-made Sand
Preparation example 1 of machine-made sand: the grain size of the machine-made sand is 0-2.36mm continuous gradation, the fineness modulus is distributed between 1.8-2, and the machine-made sand is prepared by uniformly mixing 17Kg of 0-0.015mm grain size, 25Kg of 0.015-0.03mm grain size, 34Kg of 0.03-1.18mm grain size and 24Kg of 1.18-2.36mm grain size.
Preparation example of composite Admixture
Preparation example 1 of composite admixture: 2.5Kg of silicon steel element, 0.5Kg of carboxymethyl cellulose, 20Kg of melamine formaldehyde resin, 0.2Kg of sodium citrate, 0.8Kg of polycarboxylic acid water reducing agent and 0.8Kg of aluminum potassium sulfate are mixed uniformly.
Preparation example 2 of composite admixture: 20Kg of melamine formaldehyde resin, 0.2Kg of sodium citrate, 0.8Kg of polycarboxylic acid water reducing agent and 0.8Kg of aluminum potassium sulfate are taken.
Examples
The preparation method of the environment-friendly plastering mortar of the following examples and comparative examples comprises the following steps:
s1: sequentially adding cement, slag, improved phosphogypsum, fly ash, silicon dioxide, machine-made sand and sodium hydroxide into a stirring pot, mixing and stirring at the rotating speed of 25r/min for 5 min; wherein the cement is Portland cement, and the specific surface area of the slag is 550m2/Kg；
S2: and (4) pouring the composite admixture into a stirring pot, mixing the composite admixture with the mixture prepared in the step S1, and stirring for 10min at the rotating speed of 25 r/min.
Table 2 examples 1-5 raw material compositions of environment-friendly plastering mortar
Example 6: the difference from example 1 is that in step S2, the compounded admixture was prepared by the method of preparation example 2 of the compounded admixture.
Example 7: the difference from example 1 is that the machine-made sand in step S1 was continuously graded in a range of 0.03 to 3.16mm (range of coarse aggregate grading), and the fineness modulus was distributed between 2 and 2.2.
Example 8: the difference from example 1 is that in step S1, the raw materials are added in the order of modified phosphogypsum, cement, silica, machine-made sand, slag, fly ash and sodium hydroxide.
Comparative example
Comparative example 1: the difference from example 1 is that in step S1, the modified phosphogypsum is prepared using the method of comparative preparation example 1 of modified phosphogypsum.
Comparative example 2: the difference from example 1 is that in step S1, the modified phosphogypsum is prepared using the method of comparative preparation example 2 of modified phosphogypsum.
Comparative example 3: the difference from the example 1 is that the composite admixture is not added.
Comparative example 4: the raw material ratio is the same as that of the embodiment 1, and the preparation method of the environment-friendly plastering mortar comprises the following steps: adding the improved phosphogypsum, cement, fly ash, silicon dioxide, slag, machine-made sand, sodium hydroxide and a composite additive into a stirring pot, mixing and stirring at the rotating speed of 25r/min for 5 min; wherein the cement is Portland cement, and the specific surface area of the slag is 550m2/Kg。
Comparative example 5: the raw material ratio is the same as that of the embodiment 1, and the preparation method of the environment-friendly plastering mortar comprises the following steps: pouring the composite additive into a stirring pot, stirring for 15min at the rotating speed of 35r/min, and then sequentially adding cement, slag, improved phosphogypsum, fly ash, silicon dioxide, machine-made sand and sodium hydroxide into the stirring pot for mixing and stirring at the rotating speed of 15r/min for 10 min.
Comparative example 6: the difference from example 1 is that in step S1, the modified phosphogypsum is prepared using the method of comparative preparation 3 of modified phosphogypsum.
Comparative example 7: the difference from example 1 is that in step S1, the modified phosphogypsum is prepared using the method of comparative preparation example 4 of modified phosphogypsum.
Comparative example 8: the difference from example 1 is that the machine-made sand was not graded and was purchased by the manufacturer and used directly. The machine-made sand adopted is purchased from Dalianqingpeng machine-made sand Co., Ltd, and the granularity is 0-0.5 mm.
Performance test
The following performance tests were performed on the environmentally friendly plastering mortars provided in examples 1 to 8 and comparative examples 1 to 8, and the test results are shown in table 3.
And (3) testing the strength: the flexural strength and the compressive strength of the plastering material are tested according to the regulations in the current standard of China, Highway engineering cement and cement concrete test regulations (JTGE 30-2005).
Testing the water retention: determining the water retention of plastering mortar by using a mortar layering tester: filling the mortar into a specified container, and measuring the submergence; after standing for 30min, the mortar in the lower part 1/3 of the container was taken out and the degree of sinking was measured. The difference between the two previous immersions is the degree of stratification in cm. The greater the degree of stratification, the poorer the water retention of the mortar.
And (3) testing porosity: the internal pore structure of plastering mortar is determined by adopting an Autopore II 9220 mercury porosimeter: when preparing the mercury intrusion test sample, sampling from the middle part of the cement test piece, grinding the test piece to 3-4mm, and sampling for at least two times of tests each time. Immediately after sampling, the hardened cement paste fragments are soaked in absolute ethyl alcohol to stop hydrating for more than one day and night. Before mercury intrusion test, the sample is taken out in the air to fully volatilize the absolute ethyl alcohol, and then the sample is put into an oven at 105 ℃ to be dried to constant weight so as to remove the water in the pores.
And (3) testing the setting time: according to the setting time test of chapter 4 of GBT50080-2002 common concrete mixture performance test method standard, the initial setting time and the final setting time of the currently mixed environment-friendly plastering mortar are tested.
And (3) testing a noise reduction coefficient: the method refers to a method for determining the noise reduction coefficient in the sound absorption performance grading of GB/T16731 building sound absorption products.
TABLE 3 test results
By combining the example 1 and the comparative examples 1-2 and combining the table 3, it can be seen that the phosphogypsum is not subjected to activation treatment or is not sufficiently treated, harmful components in the phosphogypsum influence the early strength of a gypsum plastering material, the breaking strength and the compressive strength are remarkably reduced after 3 days, the setting time is also remarkably increased, the phosphogypsum contains acidic substances, and calcium oxide is added to neutralize the acidic substances in the phosphogypsum, so that the harmful components in the phosphogypsum are reduced, and the influence of the harmful components on the early strength of the mortar is reduced;
it can be seen from the combination of examples 1, 2 and 3 and comparative examples 6 to 7 and the combination of table 3 that the 3-day strength of the plastering mortar shows a trend of increasing and then decreasing with the change of the mixing amount and fineness of the improved gypsum, which shows that the mechanical early-stage mechanical property of the mortar can be improved by proper amount of the improved gypsum and proper particle size, and the mortar has positive effects on the setting time, the water retention property and the like, and the pore structure and the sound absorption property are improved;
by combining examples 1, 4 and 5 and comparative example 3 and combining table 3, it can be seen that the mixing amount of the composite admixture influences the setting and hardening process of the plastering mortar, and the appropriate amount of the composite admixture can improve the 3-day strength of the plastering mortar, has positive effects on the setting time, the water retention property and the like, and improves the pore structure and the sound absorption property of the plastering mortar; too much or too little mixing amount of the composite additive can reduce the mechanical property, the setting time, the water retention property and the porosity of the plastering mortar and reduce the noise absorption performance.
It can be seen by combining examples 1 and 6 and comparative example 3 and combining table 3 that the composition of the composite admixture influences the early strength formation and the development of setting time of the gypsum-based plastering material, the absence of silicon cellulose and carboxymethyl cellulose reduces the strength and water retention of the plastering mortar, and further influences the setting and hardening process of the plastering mortar, so that the porosity and sound absorption performance of the plastering mortar are reduced;
it can be seen from a combination of examples 1-7 and comparative example 8 and from table 3 that unreasonable or no mechanical sand grading design significantly affects the early strength of the gypsum-based render, adversely affecting its pore structure and sound absorption properties.
It can be seen from the combination of examples 1, 8 and comparative examples 4 to 5 and from table 3 that a rational stirring process can accelerate the strength development of the gypsum plaster material, and has a positive effect on setting time, water retention, etc., and increases its pore structure and sound absorption.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The environment-friendly plastering mortar is characterized by comprising the following components in parts by weight: 20-30 parts of modified phosphogypsum, 15-20 parts of cement, 5-10 parts of fly ash, 5-5.5 parts of silicon dioxide, 30-35 parts of slag, 15-20 parts of machine-made sand, 0.8-1.2 parts of sodium hydroxide and 5-10 parts of a composite additive;
the raw materials of the improved phosphogypsum comprise (3.5-3.8) by weight: 1 phosphogypsum and calcium oxide;
the improved phosphogypsum is prepared by the following method: mixing the phosphogypsum and the calcium oxide uniformly, standing for 3-4h, calcining for 4-4.5h at the temperature of 450-.
2. The environment-friendly plastering mortar of claim 1, wherein the machine-made sand has a continuous gradation of 0-2.36mm in particle size and a modulus of fineness of 1.8-2.
3. The environment-friendly plastering mortar of claim 2, wherein the machine-made sand comprises 15 to 20 parts by weight of 0 to 0.015mm size fraction, 20 to 25 parts by weight of 0.015 to 0.03mm size fraction, 30 to 35 parts by weight of 0.03 to 1.18mm size fraction, and 20 to 25 parts by weight of 1.18 to 2.36mm size fraction.
4. The environment-friendly plastering mortar of claim 1, wherein the composite additive is at least one of silicon steel, carboxymethyl cellulose, melamine formaldehyde resin, sodium citrate, polycarboxylic acid water reducing agent and aluminum potassium sulfate.
5. The environment-friendly plastering mortar of claim 1, wherein the composite additive comprises the following components in a weight ratio of 2.5: 0.5: 20: 0.2: (0.5-1): (0.5-1) silicon cellulose, carboxymethyl cellulose, melamine formaldehyde resin, sodium citrate, polycarboxylic acid water reducing agent and aluminum potassium sulfate.
6. The environment-friendly plastering mortar of claim 1, wherein the specific surface area of the modified phosphogypsum is 600-650m2Per Kg; the specific surface area of the slag is 550-600m2/Kg。
7. The environment-friendly plastering mortar of claim 1, wherein the modified gypsum has a fineness of 180-200 mesh.
8. The preparation method of the environment-friendly plastering mortar as claimed in any one of claims 1 to 7, comprising the steps of:
s1: uniformly mixing the improved phosphogypsum, cement, fly ash, silicon dioxide, slag, machine-made sand and sodium hydroxide;
s2: adding the composite admixture into the mixture prepared in the step S1 and uniformly mixing.
9. The method for preparing the environment-friendly plastering mortar of claim 8, wherein the treatment time in step S1 is 5-5.5 min; in step S2, the processing time is 10-10.5min, and the rotating speed is 25-30 r/min.
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| CN114804718A (en) * | 2022-04-25 | 2022-07-29 | 苏州北清力生纳米新材料科技有限公司 | Nano aerogel building material and preparation method thereof |
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