CN115304340A - Plastering mortar and preparation method thereof - Google Patents
Plastering mortar and preparation method thereof Download PDFInfo
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- CN115304340A CN115304340A CN202110499115.XA CN202110499115A CN115304340A CN 115304340 A CN115304340 A CN 115304340A CN 202110499115 A CN202110499115 A CN 202110499115A CN 115304340 A CN115304340 A CN 115304340A
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- retarder
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- desulfurization ash
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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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
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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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- 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
Abstract
The invention provides plastering mortar and a preparation method thereof. The plastering mortar provided by the invention is prepared from the following raw materials in parts by mass: 200-700 parts of dry desulfurization ash; 250-750 parts of calcined gypsum; 30-100 parts of vitrified micro bubbles; 0.2-3 parts of retarder; 1-3 parts of cellulose ether; 0.5-1.5 parts of starch ether; 0.5-1.5 parts of thixotropic agent; 1-3 parts of desulfurization ash modifier; the retarder is an alkali-resistant retarder. The dry desulfurization ash and the plaster are used as main raw materials, the vitrified microsphere filling material is matched, the retarder, the cellulose ether, the starch ether, the thixotropic agent and the desulfurization ash modifier are added, the additives are matched according to a certain dosage, the setting time can be effectively delayed, the fluidity is improved, the good strength is ensured, the industrial solid waste is recycled due to the introduction of the dry desulfurization ash, and the cost of plastering mortar is greatly reduced.
Description
Technical Field
The invention relates to the field of building materials, in particular to plastering mortar and a preparation method thereof.
Background
Plastering mortars are widely used in europe, about 70% of the plastering of interior walls in germany is plastering mortars, and about 50% of the gypsum in uk is used for plastering mortars. In recent years, plastering mortar begins to rise in China, has the advantages of light weight, heat preservation, no hollowing and cracking, high construction efficiency and the like, the requirements of energy-saving building materials are continuously improved in recent years, a series of measures are implemented in China to encourage the development of energy-saving novel wall materials, and the plastering mortar is rapidly popularized in China.
The main raw material of the plastering mortar is semi-hydrated gypsum which is calcined by natural gypsum. China is a big country for producing natural gypsum, but because of stratum subsidence and environmental protection problems in mining areas, many areas rich in gypsum are limited or forbidden to be exploited, and the cost of plastering mortar is increased, so that the raw materials of plastering mortar begin to turn to industrial by-product gypsum. The industrial by-product gypsum mainly comprises desulfurized gypsum, phosphogypsum, fluorgypsum and the like, and has wide sources, but the main component of the industrial by-product gypsum is calcium sulfate dihydrate and has high water content, so the industrial by-product gypsum cannot be directly used in plastering mortar, can be changed into cementitious calcium sulfate hemihydrate after being processed by measures such as drying, modification, calcination, steam pressure and the like, and the energy consumption and the cost are greatly increased.
The patent application CN103332920 discloses a desulfurized gypsum mortar, which uses desulfurized gypsum, fly ash, SC retarder and cellulose ether as raw materials to produce gypsum mortar; the desulfurized building gypsum has higher market acceptance and higher price along with the increasingly pure industrialization of the desulfurized gypsum, so that the cost of the gypsum mortar prepared from the desulfurized gypsum is increased, cracking prevention measures are not added in the formula, and the desulfurized building gypsum is likely to crack in the actual use process.
Patent application CN111592312 discloses a solid waste plastering gypsum and a preparation method thereof, wherein phosphogypsum and red mud are mixed, calcined and ball-milled, and the obtained mixture is mixed with aggregate, a retarder, a thickening agent and a water-retaining agent to obtain the plastering gypsum. However, the scheme adopts the ball milling after mixing and calcining the phosphogypsum and the red mud, the process is complicated, the energy consumption is high, more than 2 types of solid wastes are jointly utilized, and the stability of the raw materials is difficult to ensure.
Patent application CN108793921 discloses an anti-crack plastering gypsum mortar, which takes high-temperature calcined desulfurized gypsum, composite portland cement, fly ash, expanded perlite, sierozem powder and the like as main raw materials to obtain environment-friendly light bottom layer plastering gypsum mortar. This scheme has adopted portland cement, and is higher than natural gypsum price, has promoted holistic cost, and the addition of cement also probably leads to the gypsum later stage to shrink too big, and mortar and basic unit bonding strength are poor, cause the hollowing.
The prior art mostly uses natural gypsum as a main raw material, and the natural gypsum is mostly forbidden or limited to be mined at present, is expensive and is mainly supplied as a high-end gypsum product. At present, the substitutes of natural gypsum mainly comprise desulfurized gypsum and phosphogypsum. The desulfurized gypsum has the advantages of good overall quality, low price compared with natural gypsum, blackish color and high possibility of chloride ion after a series of dehydration and calcination treatments. Phosphogypsum also needs to be treated by processes of dehydration, calcination and the like, and the phosphogypsum contains more impurities, and part of phosphogypsum has the problem of overhigh radioactivity.
The dry/semi-dry desulfurized fly ash is dry powdery industrial solid waste, has low price, wherein the content of the calcium sulfate hemihydrate accounts for 5 to 60 percent of the mass ratio, has gelling property, and can be used as a plastering mortar cementing material. In addition, the dry desulfurization ash also contains 3-30% of calcium hydroxide, is an air-hardening cementing material, has certain strength, and can play a role in adjusting the pH value of mortar and improving the cracking resistance of the mortar in plastering mortar. The dry desulfurized fly ash also contains 5 to 15 percent of calcium carbonate and 5 to 15 percent of calcium sulfite, and can be used as a filler in mortar. Therefore, if the dry/semi-dry desulfurized fly ash can be used, the solid waste can be recycled, and the cost can be reduced. Theoretically, the dry/semi-dry desulfurized fly ash can be expected to be applied to plastering mortar due to the characteristics, however, the desulfurized fly ash based plastering mortar has certain difficulty in use, and can cause the problems of too fast setting time, reduced mortar fluidity, strength change and the like, and influence the performance of the finished mortar.
Disclosure of Invention
In view of this, the present invention provides a plastering mortar and a preparation method thereof. The plastering mortar provided by the invention can effectively reduce the product cost, and can effectively delay the setting time, improve the fluidity and ensure good strength.
The invention provides plastering mortar which is prepared from the following raw materials in parts by mass:
the retarder is an alkali-resistant retarder.
Preferably, the desulfurized fly ash modifier is selected from one or more of polycarboxylate, melamine and naphthalene sulfonate formaldehyde condensate.
Preferably, the polycarboxylate is selected from one or more of amide-imide type polycarboxylate, acryl ether type polycarboxylate and sodium polycarboxylate.
Preferably, the retarder is selected from one or more of a saccharide retarder, citric acid, tartaric acid and a protein retarder.
Preferably, the saccharide retarder is sucrose;
the protein retarder is an alkali-resistant protein retarder.
Preferably, the specification of the dry desulfurization ash is as follows: the content of calcium sulfate is more than 25wt%, the grain diameter of D90 is less than 100 μm, and the water content is less than 2.0%.
Preferably, the dry desulfurization ash comprises the following components in percentage by mass:
preferably, the cellulose ether is hydroxypropyl methyl cellulose ether;
the viscosity of the cellulose ether at 25 ℃ is 4-15MPa.s.
Preferably, the thixotropic agent is selected from one or more of magnesium aluminum silicate, montmorillonite, white carbon black and calcium stearate;
the plaster of paris is selected from one or more of natural building plaster, desulfurized building plaster and phosphorous building plaster.
The invention also provides a preparation method of the plastering mortar in the technical scheme, which comprises the following steps:
and mixing the dry desulfurization ash and the desulfurization ash modifier, and then adding plaster, vitrified micro bubbles, a retarder, cellulose ether, starch ether and a thixotropic agent for mixing to obtain the plastering mortar.
The dry desulfurization ash and the plaster are used as main raw materials, the vitrified microsphere filling material is matched, the retarder, the cellulose ether, the starch ether, the thixotropic agent and the desulfurization ash modifier are added, the additives are matched according to a certain dosage, the setting time can be effectively delayed, the fluidity is improved, and the good strength is ensured.
Test results show that the plastering mortar provided by the invention has the initial setting time of more than 85min, the final setting time of more than 95min, the water retention rate of more than 87%, the flexural strength of more than 1MPa, the compressive strength of more than 3.2MPa and the bonding tensile strength of more than 0.41 MPa.
Detailed Description
The invention provides plastering mortar which is prepared from the following raw materials in parts by mass:
the retarder is an alkali-resistant retarder.
The dry desulfurization ash and the plaster are used as main raw materials, the vitrified microsphere filling material is matched, the retarder, the cellulose ether, the starch ether, the thixotropic agent and the desulfurization ash modifier are added, the additives are matched according to a certain dosage, the setting time can be effectively delayed, the fluidity is improved, the good strength is ensured, the industrial solid waste is recycled due to the introduction of the dry desulfurization ash, and the cost of plastering mortar is greatly reduced.
In the invention, the dry desulfurization ash and the calcined gypsum are used as main raw materials.
The dry desulfurized fly ash refers to a dry/semi-dry desulfurization process such as Circulating Fluidized Bed (CFB), NID or SDA, which is adopted to produce a calcium-based powdery mixture rich in calcium sulfite, calcium sulfate, calcium carbonate, calcium hydroxide and the like. In the invention, the dry desulfurization ash is generated by a glass kiln or a catalytic cracking flue gas desulfurization device. In the present invention, the specification of the dry desulfurized fly ash is preferably: the content of calcium sulfate is more than 25wt%, the grain diameter of D90 is less than 100 μm, and the water content is less than 2.0%.
In the invention, more preferably, the dry desulfurization ash mainly comprises the following components in percentage by mass:
in some embodiments of the invention, the main components of the dry desulphurized ash comprise: calcium sulfate 37.93wt%, calcium hydroxide 23.43wt%, calcium carbonate 16.20wt%, and calcium sulfite 10.09wt%.
In the invention, the dosage of the dry desulfurization ash is 200-700 parts by mass; in some embodiments of the invention, it is used in an amount of 200 parts, 400 parts, or 700 parts.
In the present invention, the plaster of Paris (i.e., hemihydrate gypsum) is used together with the above-mentioned dry desulfurized fly ashAnd (3) main raw materials. Calcium sulfate with two molecular crystal waters is called gypsum or gypsum plaster (CaSO) 4 ·2H 2 O); heating Gypsum Fibrosum to lose most of crystal water and turn into mature Gypsum Fibrosum (CaSO) 4 ·1/2H 2 O). In the invention, the plaster of paris is preferably one or more of natural building plaster, desulfurized building plaster and phosphorus building plaster. The desulfurized gypsum is: adopting a wet process to purify sulfur-containing flue gas to obtain a paste-like industrial byproduct, wherein the main component is calcium sulfate dihydrate; the desulfurized building gypsum in the plastering mortar is a raw material obtained by calcining desulfurized gypsum, wherein the main component is calcium sulfate hemihydrate. The phosphogypsum is: the phosphate ore is used as a raw material, and a pasty industrial byproduct generated in the process of preparing phosphoric acid by a wet method comprises the main component of calcium sulfate dihydrate; the phosphorus building gypsum in the plastering mortar is a raw material obtained by calcining phosphogypsum, wherein the main component is calcium sulfate hemihydrate.
In the invention, the dosage of the calcined gypsum is 250-750 parts by mass based on 200-700 parts by mass of the dry desulfurization ash; in some embodiments of the invention, the amount of plaster of paris is 250 parts, 550 parts, or 750 parts.
In the invention, the retarder is an alkali-resistant retarder. The plastering mortar uses cheap dry-method desulfurized fly ash as a main raw material, calcium sulfate hemihydrate in the dry-method desulfurized fly ash plays a role of a cementing material, calcium hydroxide in the dry-method desulfurized fly ash provides certain strength and plays a role of cracking resistance, and calcium carbonate and calcium sulfite in the dry-method desulfurized fly ash play a role of a filler; however, the plastering mortar still has the problems of short setting time, increased water demand, high mortar viscosity, poor construction performance and the like, and cannot meet the market demand. The pH value of plastering mortar on the market is neutral or slightly acidic, and the commonly used retarder has small effect on desulfurized mortar plastering mortar, so after the experiment of the applicant, the better retarding effect can be achieved by selecting the alkali-resistant retarder. In the invention, the retarder is preferably one or more of a saccharide retarder, citric acid, tartaric acid and a protein retarder. Wherein the sugar retarder is preferably sucrose. The protein retarder is preferably an alkali-resistant protein retarder; in some embodiments of the invention, are Edman force (i.e., A-mali) protein retarders.
In the invention, the consumption of the retarder is 0.2-3 parts by mass based on 200-700 parts by mass of the dry desulfurization ash; in some embodiments of the invention, the amount of plaster of paris is 0.6, 0.8, 2, or 3 parts. With the increase of the content of the desulfurized lime, the mixing amount of the retarder should be properly increased.
In the invention, the desulfurization ash modifier is preferably one or more of polycarboxylate, melamine and naphthalene sulfonate formaldehyde condensate. By adopting the modifier, the polyoxyalkyl, amino, hydroxyl or carboxyl groups and water have stronger affinity, the dispersing performance and the flowing performance of the desulfurized fly ash can be improved through the effects of adsorption, dispersion, wetting, lubrication and the like, and meanwhile, the polycarboxylic acid is adsorbed on the surface of desulfurized fly ash particles, so that the surface of the desulfurized fly ash is charged with negative charges, the desulfurized fly ash particles generate electrostatic repulsion, free water wrapped in aggregates in the mixing process is released, and the overall fluidity of the mortar is finally improved. Compared with other additives such as a dispersing agent or a water reducing agent, the special desulfurized fly ash modifier has better adaptability with the desulfurized fly ash gypsum system, and hydroxyl groups and carboxylic acid groups in the modifier can chelate free calcium in the system, reduce the concentration of calcium ions, delay the hydration crystallization speed of calcium sulfate dihydrate and achieve the effect of increasing the initial setting time. The other types of water reducing agents cannot be fully adsorbed on the surface of the desulfurized fly ash particles, so that the effects of dispersing, lubricating, improving the fluidity and increasing the initial setting time are achieved.
Wherein, the polycarboxylate is preferably one or more of amide-imide polycarboxylate, acrylic ether polycarboxylate and sodium polycarboxylate. The naphthalenesulfonate formaldehyde condensate is preferably a sodium naphthalenesulfonate formaldehyde condensate. In some embodiments of the invention, the desulfurized fly ash modifier is a sodium naphthalene sulfonate formaldehyde condensate or a sodium acrylate polycarboxylate.
In the invention, the dosage of the desulfurization ash modifier is 1-3 parts by mass based on 200-700 parts by mass of the dry desulfurization ash; in some embodiments of the invention, the desulfurized fly ash modifier is used in an amount of 1 part or 2 parts.
In the invention, the vitrified micro bubbles are used as the filling material, compared with other filling materials, the vitrified micro bubbles can be better matched with a dry desulphurization ash and plaster system, and are matched with other additives to act, so that the performance of the mortar is improved. In the present invention, the specification of the vitrified small balls is preferably: particle size of 80 meshes and volume weight of 100kg/m 3 。
In the invention, the use amount of the vitrified micro bubbles is 30 to 100 parts by mass based on 200 to 700 parts by mass of the dry desulfurization ash; in some embodiments of the present invention, the amount of the vitrified small bubbles is 50 parts.
In the present invention, the cellulose ether is preferably hydroxypropyl methyl cellulose ether. In the present invention, the viscosity of the hydroxypropyl methylcellulose ether at 25 ℃ is 4 to 15mpa.s. In the invention, the dosage of the cellulose ether is 1-3 parts by mass based on 200-700 parts by mass of the dry desulfurization ash; in some embodiments of the present invention, the cellulose ether is used in an amount of 2 parts.
In the invention, the dosage of the starch ether is 0.5-1.5 parts; in some embodiments of the invention, the starch ether is used in an amount of 1 part.
In the invention, the thixotropic agent is preferably one or more of magnesium aluminum silicate, montmorillonite, white carbon black and calcium stearate. In the invention, the dosage of the thixotropic agent is 0.5-1.5 parts by mass based on 200-700 parts by mass of the dry desulfurization ash; in some embodiments of the present invention, the amount of thixotropic agent is 1 part.
The plastering mortar provided by the invention is desulfurized fly ash plastering mortar, the low-price dry desulfurized fly ash is used as a main raw material, part of plaster and additives are added, and the additives contain an alkali-resistant retarder, a desulfurized fly ash modifier and other additives and are introduced in a certain proportion, so that the setting time can be effectively delayed, the fluidity is improved, the good strength is ensured, and the anti-cracking performance is enhanced.
The invention also provides a preparation method of the plastering mortar in the technical scheme, which comprises the following steps:
and mixing the dry desulfurization ash and the desulfurization ash modifier, and then adding plaster, vitrified micro bubbles, a retarder, cellulose ether, starch ether and a thixotropic agent for mixing to obtain the plastering mortar.
The types, the use amounts and the like of the dry desulfurization ash, the desulfurization ash modifier, the plaster of paris, the vitrified micro bubbles, the retarder, the cellulose ether, the starch ether and the thixotropic agent are consistent with those in the technical scheme, and are not repeated one by one.
In the invention, the mixing temperature of the dry desulfurization ash and the desulfurization ash modifier is preferably 50-70 ℃; the mixing time is preferably 3 to 5min. After the above mixing, cooling to room temperature, adding the other materials, and uniformly mixing to obtain the plastering mortar.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In the following examples and comparative examples, the dry flue gas desulfurization ash is derived from the dry flue gas desulfurization ash generated in a catalytic cracking flue gas desulfurization unit in Hubei, and the main components are as follows: calcium sulfate 37.93wt%, calcium hydroxide 23.43wt%, calcium carbonate 16.20wt%, calcium sulfite 10.09wt%; d90 particle size is less than 100 μm, and water content is less than 2.0%. The viscosity of the hydroxypropyl methyl cellulose ether at 25 ℃ is 4-15MPa.s. The specifications of the vitrified microbeads are as described above.
Comparative example 1
The plastering mortar comprises the following raw materials:
950 parts of calcined gypsum, 50 parts of vitrified micro bubbles, 2 parts of XQ protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent and 1 part of starch ether.
Comparative example 2
The plastering mortar comprises the following raw materials:
200 parts of dry desulfurization ash, 750 parts of plaster of paris, 50 parts of vitrified micro bubbles, 2 parts of XQ protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent and 1 part of starch ether.
Comparative example 3
The plastering mortar comprises the following raw materials:
200 parts of dry desulfurization ash, 750 parts of plaster of paris, 50 parts of vitrified micro bubbles, 4 parts of XQ protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent and 1 part of starch ether.
After the plastering mortar product is prepared into a test sample with a corresponding test standard shape, various performance tests are carried out, and the results are shown in table 1.
Comparing comparative example 2 with comparative example 1, it can be seen that the setting time is greatly shortened after the dry desulfurized fly ash is directly added, particularly the initial setting time is lower than the national standard, and the fluidity of the mortar is obviously reduced. In contrast, in comparative example 3, the addition amount of the retarder was directly increased, but the setting time was not significantly improved, and direct practical application was difficult.
Example 1
1. Raw material formula
200 parts of dry desulfurization ash, 750 parts of plaster, 50 parts of vitrified micro-beads, 0.6 part of citric acid retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent, 1 part of starch ether and 1 part of sodium naphthalenesulfonate formaldehyde condensate desulfurization ash modifier.
2. Preparation:
mixing the dry desulfurization ash and the desulfurization ash modifier at 60 ℃ for 5min, cooling to room temperature, adding plaster, vitrified micro bubbles, a retarder, cellulose ether, starch ether and a thixotropic agent, and uniformly stirring to obtain the plastering mortar.
Example 2
1. Raw material formula
400 parts of dry desulfurization ash, 550 parts of calcined gypsum, 50 parts of vitrified micro-beads, 0.6 part of citric acid retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent, 1 part of starch ether and 1 part of sodium naphthalenesulfonate formaldehyde condensate desulfurization ash modifier.
2. Preparation: the same as in example 1.
Example 3
1. Raw material formula
700 parts of dry desulfurization ash, 250 parts of plaster of paris, 50 parts of vitrified micro bubbles, 0.8 part of citric acid retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of aluminum magnesium silicate thixotropic agent, 1 part of starch ether and 2 parts of sodium naphthalenesulfonate formaldehyde condensate desulfurization ash modifier.
2. Preparation: the same as in example 1.
Example 4
1. Raw material formula
200 parts of dry desulfurization ash, 750 parts of plaster, 50 parts of vitrified micro bubbles, 2 parts of an Edman protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of calcium stearate thixotropic agent, 1 part of starch ether and 1 part of propylene ether type sodium polycarboxylate desulfurization ash modifier.
2. Preparation: the same as in example 1.
Example 5
1. Raw material formula
400 parts of dry desulfurization ash, 550 parts of plaster of paris, 50 parts of vitrified micro bubbles, 2 parts of an Edman protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of calcium stearate thixotropic agent, 1 part of starch ether and 1 part of propylene ether type sodium polycarboxylate desulfurization ash modifier.
2. Preparation: the same as in example 1.
Example 6
1. Raw material formula
700 parts of dry desulfurization ash, 250 parts of plaster of paris, 50 parts of vitrified micro bubbles, 3 parts of an Edman protein retarder, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of calcium stearate thixotropic agent, 1 part of starch ether and 2 parts of propylene ether type sodium polycarboxylate desulfurization ash modifier.
2. Preparation: the same as in example 1.
After the plastering mortar product is prepared into a test sample with a corresponding test standard shape, various performance tests are carried out, and the results are shown in table 1.
TABLE 1 results of performance test of plastering mortars obtained in examples 1 to 6 and comparative examples 1 to 3
As can be seen from the test results in Table 1, compared with the comparative examples 2-3, the plastering mortars obtained in the examples 1-6 of the invention have obviously prolonged initial setting time and final setting time, other performance indexes all meet the national standard, and the bonding tensile strength is improved. Compared with the comparative example 1, the invention introduces the dry-method desulfurized fly ash, greatly reduces the cost, and enables the setting time and other performances to still meet the national standard by adjusting the formula on the basis of introducing the dry-method desulfurized fly ash.
Comparative example 4
Performed as in example 6, except that the edman's protein retarder in the stock formulation was replaced with a sodium polyphosphate retarder.
Comparative example 5
Performed as in example 6, except that the desulfurized fly ash modifier in the feedstock formulation was replaced with a sodium lignosulfonate water reducer.
See table 2 for product properties of comparative examples 4-5.
TABLE 2 results of the Performance test of the plastering mortars obtained in comparative examples 4 to 5
As can be seen from Table 2, if other types of retarders and desulfurization ash modifiers are adopted, the setting time is shortened, and the strength performance is reduced, and the alkali-resistant retarders and the desulfurization ash modifiers provided by the invention can effectively delay the setting time of plastering mortar and ensure good strength performance.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The plastering mortar is characterized by being prepared from the following raw materials in parts by mass:
the retarder is an alkali-resistant retarder.
2. The plastering mortar of claim 1, wherein the desulfurized fly ash modifier is selected from one or more of polycarboxylate, melamine and naphthalene sulfonate formaldehyde condensate.
3. Plastering mortar according to claim 2, wherein the polycarboxylate is one or more selected from the group consisting of amide-imide type polycarboxylate, acryl ether type polycarboxylate and sodium polycarboxylate.
4. The plastering mortar of claim 1, wherein the retarder is selected from one or more of a saccharide retarder, citric acid, tartaric acid and a protein retarder.
5. The plastering mortar of claim 5, wherein the saccharide retarder is sucrose;
the protein retarder is an alkali-resistant protein retarder.
6. The plastering mortar of claim 1, wherein the dry desulfurized fly ash has the specification: the content of calcium sulfate is more than 25wt%, the grain diameter of D90 is less than 100 μm, and the water content is less than 2.0%.
7. The plastering mortar of claim 1 or 6, wherein the dry desulfurized fly ash comprises the following components in percentage by mass:
8. the plastering mortar of claim 1, wherein the cellulose ether is hydroxypropyl methyl cellulose ether;
the viscosity of the cellulose ether at 25 ℃ is 4-15MPa.s.
9. The plastering mortar of claim 1, wherein the thixotropic agent is one or more selected from the group consisting of aluminum magnesium silicate, montmorillonite, white carbon black and calcium stearate;
the plaster of paris is selected from one or more of natural building plaster, desulfurized building plaster and phosphorous building plaster.
10. A method for preparing the plastering mortar of any one of claims 1 to 9, comprising:
and mixing the dry desulfurization ash and the desulfurization ash modifier, and then adding plaster, vitrified micro bubbles, a retarder, cellulose ether, starch ether and a thixotropic agent for mixing to obtain the plastering mortar.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116535119A (en) * | 2023-05-12 | 2023-08-04 | 北京泰路达工程技术发展有限公司 | Viscosity improving material for structural reinforcement injection polymer mortar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02153702A (en) * | 1988-12-06 | 1990-06-13 | Mitsubishi Heavy Ind Ltd | Manufacture of hardened gypsum body |
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