CN112159196B - High-strength waterproof plastering gypsum mortar and preparation method thereof - Google Patents
High-strength waterproof plastering gypsum mortar and preparation method thereof Download PDFInfo
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- CN112159196B CN112159196B CN202011078518.9A CN202011078518A CN112159196B CN 112159196 B CN112159196 B CN 112159196B CN 202011078518 A CN202011078518 A CN 202011078518A CN 112159196 B CN112159196 B CN 112159196B
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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
- C04B28/144—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 a flue gas desulfurization product
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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
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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
- 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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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-strength waterproof plastering gypsum mortar and a preparation method thereof, wherein the high-strength waterproof plastering gypsum mortar comprises 600 parts of gypsum 300 and 30-100 parts of soluble salt or barium hydroxide, and the soluble salt is one or more of soluble barium salt, soluble carbonate or soluble silicate. The mechanical property and the wear resistance of the plastering gypsum mortar prepared by the invention are obviously improved, and simultaneously, the compactness and the waterproof property of the gypsum and the biological durability in a humid environment are improved, and the growth of mould can be effectively inhibited.
Description
Technical Field
The invention relates to plastering gypsum mortar, in particular to a composition of high-strength waterproof plastering gypsum mortar and a preparation method thereof.
Background
In recent years, with the continuous and deep research and development of building gypsum, building gypsum products have been developed in the directions of light weight, high strength, compounding, environmental protection, multiple functions and the like, and particularly, gypsum-based composite wall materials have become the leading products of the environmental protection and energy saving wall materials in China. The gypsum plastering mortar has the obvious functions of light weight, fire prevention, heat preservation, heat insulation, humidity adjustment, sound insulation and the like, is free of shrinkage and cracking, is convenient to construct, is widely applied to wall engineering, and overcomes the defects that a cement mortar plastering material is easy to crack, hollowly and fall off.
In order to ensure better working performance of the gypsum mortar in the preparation process, the content of the calcium carbonate is far higher than that of CaSO4 & 0.5H theoretically 2 Conversion of O to CaSO4 & 2H 2 The water requirement of O, excessive moisture can escape from the gypsum slurry in the hardening process, and a large number of mutually-communicated gaps and capillaries are generated in the gypsum hardened body, and the moisture contacted with the surface of the gypsum hardened body can quickly permeate into the interior through the gaps and the capillaries; meanwhile, the gypsum hydration product CaSO4 & 2H 2 O has high solubility in water mediumIt is easily corroded in the environment and the contact points between gypsum crystals are reduced. Therefore, especially in some cities which are near the sea or have moist environments along the river, the building materials such as gypsum boards are easy to breed fungi, which not only affects the beauty of the building materials, but also can cause the crystal structure of the gypsum to be damaged. In addition, under the hydration medium environment, the water absorption rate of the gypsum hardened material is increased, the hardness, the mechanical property and the biological durability are greatly reduced, the service life is shortened, and the use of the gypsum hardened material in the humid environments such as external walls, kitchens, toilets and the like is severely limited.
At present, most researchers in China usually aim at improving the strength and the hardness of a gypsum material by introducing portland cement and an active admixture into the gypsum cementing material, but on the one hand, calcium sulfate in the gypsum cementing material reacts with a cement hydration product to generate partial ettringite, so that the multi-sulfur ettringite in the cement hydration product is converted into single-sulfur ettringite, and the cement shrinks and cracks; on the other hand, the solubility of calcium sulfate in the gypsum cementing material is higher than that of tricalcium aluminate in a cement hydration product, and part of portland cement is doped in the gypsum cementing material to cause gypsum to form a supersaturated solution, so that the cement is quickly coagulated to cause a pseudo coagulation phenomenon.
For the problem that the existing gypsum is not water-resistant, a large number of researchers often lead the surfaces of particles in the hardened gypsum to form a waterproof layer by introducing materials such as a waterproof agent, a water repellent and the like (such as metal soap, asphalt, stearic acid, resin and the like), so that the water resistance of the desulfurized building gypsum product is improved; or by adding a small amount of inorganic modifier, such as fly ash, cement, slag, quicklime, high-calcium ash, sulphoaluminate or other inorganic salts, etc., the method can improve the water resistance of the gypsum product to a certain extent, but has long hydration age, low precipitation conversion rate, unobvious water absorption reduction and relatively small improvement amplitude of softening coefficient; some researches have adopted the hydrophobic material to be sprayed on the surface of the gypsum hardened body or the hydrophobic material is coated on the gypsum product to form a hydrophobic layer on the surface. The 3 technical measures have good effect on short-term water resistance of the gypsum, so that the water absorption of the gypsum product for 2 hours is only 3% -6%, but the long-term water resistance effect is not ideal, and the water absorption for 24 hours is generally more than 10%.
In the prior art, a retarder is added into gypsum, and substances generated by the retarder are wrapped on the surfaces of gypsum particles, so that the effects of inhibiting the hydration of the gypsum and prolonging the setting time of the gypsum are achieved by reducing the dissolving speed of the gypsum. But the precipitation conversion rate is low, and the strength and the water resistance of the gypsum mortar after preparation are still insufficient.
Therefore, the technical personnel in the field are dedicated to develop a high-strength water-resistant plastering gypsum mortar with good water resistance and a preparation method thereof.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is to provide a high-strength water-resistant plastering gypsum mortar with good water resistance and a preparation method thereof.
In order to achieve the purpose, the invention provides high-strength waterproof plastering gypsum mortar, which comprises 300 parts of gypsum, 600 parts of soluble salt or barium hydroxide, and 30-100 parts of soluble salt, wherein the soluble salt is one or more of soluble barium salt, soluble carbonate or soluble silicate.
Preferably, the soluble barium salt is one or two of barium chloride and barium nitrate, the soluble carbonate is one or two of sodium carbonate and potassium carbonate, and the soluble silicate is one or two of sodium silicate and potassium silicate.
Preferably, the material also comprises 10-50 parts of nano metal material.
Preferably, the nano metal material is one or more of nano copper, nano silver and nano zinc.
Preferably, the material also comprises 30-60 parts of fly ash, 30-60 parts of quick lime, 400-700 parts of fine aggregate, 0.2-0.6 part of water retention component, 2-4 parts of water reduction component, 3-7 parts of retarding component, 2-8 parts of rubber powder and 300 parts of water 150-containing material.
Preferably, the gypsum is one of desulfurized gypsum, phosphogypsum and fluorgypsum; and the alpha-hemihydrate gypsum component of the gypsum component accounts for at least 80% by weight.
Preferably, the fly ash is one of F-type or C-type fly ash, and the activity is IIMore than grade, and the specific surface area is more than 350kg/m 2 。
Preferably, the fine aggregate is one or more of quartz sand, machine-made sand or natural river sand, the fineness modulus of the fine aggregate is 1.6-1.8, the content of mud blocks is 0, and the mud content is less than 0.5%; the fine aggregate has a bulk porosity of less than 30% and an apparent density of more than 2500kg/m 3 。
Preferably, the water retention component is hydroxypropyl methyl cellulose ether with the viscosity of less than 100000mpa.s, the water reducing component is a polycarboxylic acid water reducing agent with the solid content of at least 35%, the water reducing rate is more than 20%, and the retarding component is one of amino acids, proteins or inorganic salts; the rubber powder is vinyl ester re-dispersible latex powder.
The invention also provides a preparation method of the high-strength waterproof plastering gypsum mortar, which comprises the following steps:
1) gypsum, fly ash, quicklime, fine aggregate, a water retention component, a water reduction component, a retarding component, rubber powder, soluble salt or barium hydroxide and a nano metal material are dry-mixed in a mixer at the rotating speed of 120-200r/min for 3-5 min;
2) adding water within 2min after dry mixing, continuously wet-mixing for 2-6min at the rotating speed of 120-200r/min, stopping at 30s-60min, and continuously wet-mixing for more than 3min at the rotating speed of at least 200 r/min.
The invention has CaSO with higher solubility in the environment eroded by external water medium 4 ·2H 2 O and Ba in soluble salt or barium hydroxide 2+ 、CO 3 2- Or SiO 3 2- A precipitation conversion reaction occurs, and a slightly soluble substance CaSO4 & 2H 2 Conversion of O to insoluble precipitate: the hardness and compressive strength of barium sulfate, calcium carbonate or calcium silicate are much higher than those of calcium sulfate. Meanwhile, the insoluble precipitate fills gaps and capillaries generated in the gypsum hardening process, so that the compactness of the gypsum mortar is improved, and the waterproof performance of the gypsum can be obviously improved. Meanwhile, the invention also introduces nano metal materials (nano copper, nano silver and nano zinc) with high specific surface area and uniform fineness in the preparation process, thereby improving the gypsumBiological durability of the mortar. The antibacterial mechanism of the nano metal is as follows: under the action of light, metal ions can play a role of a catalytic center to induce oxidative stress reaction, and by increasing active oxygen to destroy the balance of an oxidation-antioxidation system, biological macromolecules are easy to be attacked by the active oxygen to destroy the reproductive capacity of bacteria, so that thalli die; secondly, when the metal ions carry positive charges and contact with groups with negative charges in cell membranes, the metal ions and the groups with the negative charges in the cell membranes are closely combined or react due to coulomb attraction, the structure and the function of the cell membranes are changed, and the metal ions react with groups such as sulfydryl (-SH) in thalli to solidify proteins, so that the function of the bacteria is influenced, and the bacteria lose the division and proliferation capacity and die. The nano metal damages protein, DNA and other biological macromolecules in the thallus together mainly through positive charges of metal ions and catalytic induction oxidative stress reaction, destroys the integrity of thallus cell structures, causes cells to be incapable of normally performing life activities, and obviously improves the biological durability of the gypsum material in a humid environment.
The invention has the beneficial effects that: the mechanical property and the wear resistance of the plastering gypsum mortar prepared by the invention are obviously improved, and simultaneously, the compactness and the waterproof property of the gypsum and the biological durability in a humid environment are improved, and the growth of mould can be effectively inhibited.
Detailed Description
The present invention will be further described with reference to the following examples. In the following examples, those not specifically mentioned are commercially available conventional products.
The application is totally provided with 7 examples, and the raw material components of the 7 examples are shown in Table 1
Table 1: EXAMPLES 1 TO 7 raw Material ingredients TABLE Unit parts by weight
In example 1, the gypsum is desulfurized gypsum; example 2 gypsum is phosphogypsum; example 3 the gypsum is fluorogypsum; example 4 gypsum is phosphogypsum; example 5 the gypsum was desulfurized gypsum; example 6 the gypsum was fluorogypsum; example 7 gypsum is phosphogypsum; in the application, the desulfurized gypsum is purchased from Chongqing Huagray building materials GmbH, and the alpha-semi-hydrated gypsum accounts for 85 percent of the weight; phosphogypsum is purchased from Brilliant phosphogypsum new building materials GmbH, Sichuan province, and the alpha-hemihydrate gypsum accounts for 90 percent of the weight; the fluorgypsum was purchased from Changsha mega Yu building materials Ltd, and the alpha-hemihydrate gypsum component accounted for 70% by weight.
In example 1, the soluble salt was barium chloride; in example 2, the soluble salt is sodium carbonate; in example 3, the soluble salt was sodium silicate; in example 4, the soluble salts were barium nitrate and potassium silicate 1: 1 mixed salt, example 5, the soluble salts were sodium carbonate and potassium silicate 1: 1 mixed salt, in example 6, the soluble salt was barium nitrate, and in example 7, barium hydroxide was added. In the examples and comparative examples of the present application, all soluble salts or barium hydroxide were purchased from the chemical reagent works of Sterculia Korea at industrial grade.
In example 1, the nano-metal material is nano-silver, which is purchased from Zhongke thunder (Beijing) science and technology Co., Ltd; in example 2, the nano-metal material is nano-copper, which is purchased from nanotechnology limited of Changhu, Suzhou; in example 3, the nano-metal material is nano-zinc and is purchased from Nanjing Eporui composite Co., Ltd; in example 4, the nano-metal material is nano-zinc, and is purchased from Nanjing Eporui composite Co., Ltd; in example 5, the nano-metal material is nano-copper, which is purchased from nanotechnology limited of Changhu, Suzhou; in example 6, the nano-metal material is nano-copper, which is purchased from nanotechnology limited of Changhu, Suzhou; the nano-metal material in example 7 is nano-silver, available from Zhongke thunder (Beijing) technologies, Inc.
Example 1 fly ash class F, with activity level ii, purchased from Qingqing Hua Luo fly ash development llc; example 2 fly ash class C, with activity grade i, was purchased from the creasjo, chongqing, fly ash ltd; example 3 fly ash class F, with activity level ii, purchased from saint joe fly ash ltd; example 4 fly ash class F, with activity level ii, was purchased from Qingqing Hualonia fly ash development ltd; example 5 fly ash class F, with activity level ii, purchased from Qingqing Hua Luo fly ash development llc; example 6 fly ash class F, with activity class ii, purchased from Chongqing Hua Lopa fly ash development, llc; example 7 fly ash class F, with activity class ii, was purchased from saint joe fly ash ltd. The fly ash in all the examples of the application is between 400-600kg/m 2.
In example 1, the fine aggregate is quartz sand, example 2 is machine-made sand, example 3 is natural river sand, and example 4 is quartz sand and machine-made sand 1: 1 mix, example 5 for machine sand and natural river sand 1: 1, mixing; example 6 is quartz sand, machine sand and natural river sand 1: 1: 1; example 7 is silica sand; the fineness modulus of the fine aggregates in examples 1 to 7 is 1.6 to 1.8, the content of mud lumps is 0, the mud content is less than 0.5%, the bulk porosity is less than 30%, and the apparent density is more than 2500kg/m 3 。
In example 1, the water-retaining component was cellulose ether produced by Longhu science and technology Limited, and the viscosity was 7.5 ten thousand mpa.S; in example 2, the water-retaining component was cellulose ether produced by Gomes chemical Co.Ltd, Shandong, and the viscosity thereof was 7.5 ten thousand mpa.S; in example 3, the water-retaining component was a cellulose ether supplied by Shandong Hendao GmbH, having a viscosity of 7.5 ten thousand mpa.S; in example 4, the water-retaining component was cellulose ether supplied by Shandong Teleis chemical Co., Ltd., viscosity was 7.5 ten thousand mpa; in example 5, the water-retaining component was cellulose ether manufactured by Longhu science and technology Limited, and the viscosity was 7.5 ten thousand mpa.S; in example 6, the water-retaining component was a cellulose ether supplied by Shandong Hauda GmbH, viscosity 7.5 mpa.S.; in example 7, the water-retaining component was a cellulose ether supplied by Shandong Telesis chemical Co., Ltd. and had a viscosity of 7.5 ten thousand mpa.S. In the embodiment 1, the water reducing component is a polycarboxylic acid powder water reducing agent provided by the company of western Ka (China), model SP-540; in example 2, the water-reducing component was: a polycarboxylic acid powder water reducing agent provided by German BASF China GmbH, model F10; in example 3, the water reducing component was a polycarboxylic acid powder water reducing agent, model F10, supplied by basf china ltd, germany; in example 4, the water reducing component is a polycarboxylic acid powder water reducing agent, model F10, provided by basf china ltd, germany; in example 5, the water-reducing component was a polymer provided by Jiangsu Subot New materials GmbHCarboxylic acid powder Water reducing agent, type
A powdery polycarboxylic acid water reducing agent; in example 6, the water-reducing component was a polycarboxylic acid powder water-reducing agent, model number, supplied by Jiangsu Subot New materials GmbH
A powdery polycarboxylic acid water reducing agent; in example 7, the water reducing component was a polycarboxylic acid powder water reducing agent, model SP-540, available from western ca (china) limited. In example 1, the retarding component was a PE-based amino acid retarder provided by Shunhua Dow chemical Co., Ltd; in example 2, the retarding component was a phosphate retarder of class GA1, supplied by Shunhua chemical Co., Ltd, Shanghai; in example 3, the retarding component was a group SG-H protein retarder provided by Shunhua Dow.K. Co., Ltd; in example 4, the retarding component was a PE-based amino acid retarder and a GA 1-based phosphate retarder 1 provided by shunhua corporation, shanghai: 1, mixing; in example 5, the retarding component was a GA 1-type phosphate retarder and an SG-H-type protein retarder 1 provided by shunhydraulic limited, shanghai: 1, mixing; in example 6, the retarding component was a group SG-H protein retarder provided by Shunhua Dow.K.Shanghai; in example 7, the retarding component was a group SG-H protein retarder provided by Shunhua Dow.K.Shanghai. In examples 1 to 7, the rubber powder was vinyl ester, and EVA powder manufactured by wacker (china) co.Ltd in germany, EVA powder manufactured by three-dimensional group co.Ltd in shanxi, was used in examples 1 and 2, EVA powder manufactured by taiwan chemical industry co.Ltd was used in examples 3 and 4, and EVA powder manufactured by taiwan chemical industry co.Ltd was used in examples 5 to 7.
After the raw material preparation was completed, examples 1 to 7 were prepared by the following method:
1) gypsum, fly ash, quicklime, fine aggregate, a water retention component, a water reduction component, a retarding component, rubber powder, soluble salt or barium hydroxide and a nano metal material are dry-mixed in a mixer at the rotating speed of 120-200r/min for 3-5 min;
2) adding water within 2min after the dry mixing is finished, continuing to perform wet mixing for 2-6min at the rotating speed of 120-200r/min, stopping 30S-60S, allowing the admixture to react with the gypsum, escaping micro bubbles generated by the organic admixture in the stirring process, and continuing to perform wet mixing for more than 3min at the rotating speed of at least 200r/min until the mixture is uniformly stirred. The additive refers to soluble salt or barium hydroxide, a water retention component, a water reducing component, a retarding component, rubber powder and the like in the application. In the step, the stirring time and the stirring speed are strictly controlled, and a large amount of bubbles can be generated due to overlong stirring time and overlarge stirring speed, so that the later strength development of the gypsum is weakened. The high-strength waterproof plastering gypsum mortar prepared in the above examples 1 to 7 is subjected to mechanical property test according to the plastering gypsum method of 2012 GB/T28627-; carrying out water absorption test according to JC/T984-2011 Polymer Cement waterproof mortar; the softening coefficient is tested according to GB/T20473-2006 building thermal insulation mortar. In addition, the biological durability adopts the fungi of aspergillus and penicillium, and the growth condition of the fungi on the surface of the gypsum board is determined according to ASTMG 21-2009 determination of fungus resistance of synthetic polymer materials. Since the specific measurement method is the standard, it is not described herein. The results are shown in Table 2.
Table 2 table of test results of examples
In other embodiments, the water reducing component may also be a naphthalene based, melamine, fatty acid salt water reducing agent, and also has higher strength and water resistance, and through test tests, if the formula weights of examples 1 to 7 are adopted, the water reducing agent is respectively replaced by a naphthalene based, melamine, fatty acid salt water reducing agent (three water reducing agents are all products of basf china ltd, germany), and the preparation and detection are carried out by the methods of examples 1 to 7, the 3d average compressive strength can respectively reach 5.5MPa, 5.2MPa, 5.1MPa, the 3d flexural strength can respectively reach 2.5MPa, 2.4MPa, 2.1MPa, and the water absorption rate is 7.8%, 8.1%, and 9.3% on average; compared with the prior art, the long-term compressive strength and the breaking strength of the composite material are improved to a certain extent, the water absorption rate is remarkably reduced, and the growth of the mold is inhibited.
Comparative examples 1 to 3 were further provided, and the raw material components of comparative examples 1 to 3 are shown in Table 3.
TABLE 3 TABLE unit parts by weight of raw materials of comparative example 1 to comparative example 3
| Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Gypsum plaster | 400 | 500 | 500 |
| Fly ash | 60 | 50 | 50 |
| Quick lime | 50 | 50 | 50 |
| Fine aggregate | 490 | 400 | 400 |
| Water retention component | 0.3 | 0.5 | 0.5 |
| Water reducing component | 3 | 4 | 4 |
| Retarding component | 3 | 5 | 5 |
| Rubber powder | 5 | 8 | 8 |
| Soluble salts or barium hydroxide | / | / | 50 |
| Nano metal material | / | 45 | / |
| Water (W) | 215 | 210 | 210 |
In comparative example 3, barium nitrate was selected as the soluble salt. In comparative examples 1 to 3, the materials not particularly emphasized were the same as in example 1.
All the raw materials of comparative example 1 and comparative example 2 were prepared and tested for properties according to the method of the present invention, and the results are shown in table 4.
TABLE 4
According to the detection results, the plastering gypsum mortar prepared by the method is high in initial and later strength, low in water absorption rate and capable of effectively inhibiting growth of mold.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (7)
1. A high-strength waterproof plastering gypsum mortar is characterized in that: comprises 600 portions of gypsum 300 and 30 to 100 portions of soluble barium salt or barium hydroxide;
the soluble barium salt is one or two of barium chloride and barium nitrate;
10-50 parts of nano metal material;
also comprises 30-60 parts of fly ash, 30-60 parts of quick lime, 400-containing fine aggregate and 700 parts of water-retaining component, 0.2-0.6 part of water-reducing component, 2-4 parts of retarding component, 3-7 parts of rubber powder and 300 parts of water-containing 150.
2. The high strength water resistant plastering gypsum mortar of claim 1, wherein: the nano metal material is one or more of nano copper, nano silver and nano zinc.
3. The high strength water resistant plastering gypsum mortar of claim 1, wherein: the gypsum is one of desulfurized gypsum, phosphogypsum and fluorgypsum; and the alpha-hemihydrate gypsum component in the gypsum component accounts for at least 80% of the weight.
4. The high strength water resistant plastering gypsum mortar of claim 1, wherein: the fly ash is one of F-class or C-class fly ash, the activity is more than II grade, and the specific surface area is more than 350kg/m 2 。
5. The high strength water resistant plastering gypsum mortar of claim 1, wherein: the fine aggregate is one or more of quartz sand, machine-made sand or natural river sand, the fineness modulus of the fine aggregate is 1.6-1.8, the content of mud blocks is 0, and the mud content is less than 0.5%; the fine aggregate has a bulk porosity of less than 30% and an apparent density of more than 2500kg/m 3 。
6. The high strength water resistant plastering gypsum mortar of claim 1, wherein: the water retention component is hydroxypropyl methyl cellulose ether, the viscosity of the water retention component is lower than 100000mpa.s, the water reduction component is a polycarboxylic acid water reducer with the solid content of at least 35 percent, the water reduction rate is higher than 20 percent, and the slow-setting component is one of amino acids, proteins or inorganic salts; the rubber powder is vinyl ester redispersible latex powder.
7. A method for preparing the high-strength water-resistant plastering gypsum mortar of claims 1 to 6, comprising the steps of:
1) gypsum, fly ash, quicklime, fine aggregate, a water retention component, a water reduction component, a retarding component, rubber powder, soluble barium salt or barium hydroxide and a nano metal material are dry-mixed in a mixer at the rotating speed of 120-200r/min for 3-5 min;
2) adding water within 2min after dry mixing, continuously wet-mixing for 2-6min at the rotating speed of 120-200r/min, stopping at 30s-60min, and continuously wet-mixing for more than 3min at the rotating speed of at least 200 r/min.
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| CN115180910A (en) * | 2022-07-13 | 2022-10-14 | 浙江华德新材料有限公司 | Colored antibacterial gypsum self-leveling mortar and preparation method thereof |
| CN116573913B (en) * | 2023-05-08 | 2024-06-28 | 浙江台州利伟节能建材有限公司 | Light plastering gypsum mortar and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002356363A (en) * | 2001-05-31 | 2002-12-13 | Taiheiyo Material Kk | Mortar |
| CN101913832A (en) * | 2010-08-04 | 2010-12-15 | 李彦峰 | Antibacterial mildew-proof high-strength whitewash mortar |
| CN110156422A (en) * | 2019-06-20 | 2019-08-23 | 诸暨市兆山天峰干混砂浆有限公司 | Gypsum plastering mortar and its construction technology suitable for machine sprayization spraying application |
| CN110342894A (en) * | 2019-07-25 | 2019-10-18 | 成都宏基建材股份有限公司 | A kind of novel water-proof gypsum based self-leveling material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002356363A (en) * | 2001-05-31 | 2002-12-13 | Taiheiyo Material Kk | Mortar |
| CN101913832A (en) * | 2010-08-04 | 2010-12-15 | 李彦峰 | Antibacterial mildew-proof high-strength whitewash mortar |
| CN110156422A (en) * | 2019-06-20 | 2019-08-23 | 诸暨市兆山天峰干混砂浆有限公司 | Gypsum plastering mortar and its construction technology suitable for machine sprayization spraying application |
| CN110342894A (en) * | 2019-07-25 | 2019-10-18 | 成都宏基建材股份有限公司 | A kind of novel water-proof gypsum based self-leveling material |
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