CN114988838B - Gypsum self-leveling mortar and preparation method thereof - Google Patents
Gypsum self-leveling mortar and preparation method thereof Download PDFInfo
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- CN114988838B CN114988838B CN202210882994.9A CN202210882994A CN114988838B CN 114988838 B CN114988838 B CN 114988838B CN 202210882994 A CN202210882994 A CN 202210882994A CN 114988838 B CN114988838 B CN 114988838B
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to gypsum self-leveling mortar and a preparation method thereof, relates to the field of building materials, and the gypsum self-leveling mortar is prepared from the following raw materials in parts by weight: 500-600 parts of phosphogypsum, 200-300 parts of modified carbonized rice hulls, 150-200 parts of fine aggregates, 1-2 parts of stabilizing agents, 0.5-1 part of water reducing agents and 220-300 parts of water; a preparation method of gypsum self-leveling mortar comprises the following steps: the phosphogypsum, the modified carbonized rice hulls, the fine aggregate, the stabilizer, the water reducing agent and the water are uniformly stirred to obtain the gypsum self-leveling mortar.
Description
Technical Field
The application relates to the field of building materials, in particular to gypsum self-leveling mortar and a preparation method thereof.
Background
The gypsum self-leveling mortar is a novel mortar product in China at present, is prepared by compounding gypsum serving as a base material with a filler, an aggregate and an additive, has good fluidity, dimensional stability and comfortableness, can overcome the defects of cement mortar, and is the best choice for leveling buildings.
When a building is decorated, gypsum self-leveling mortar is usually adopted to paint a wall surface or a ground surface, and along with the change of the application requirements of modern buildings, people pay more and more attention to the sound insulation performance of the building. At present, gypsum self-leveling mortar on the market does not have the heat preservation performance, so that gypsum self-leveling mortar with sound insulation is urgently needed to meet the requirements of people on indoor buildings.
Disclosure of Invention
In order to enable the mortar to have heat insulation performance so as to meet the requirements of people on indoor building decoration, the application provides gypsum self-leveling mortar and a preparation method thereof.
In a first aspect, the application provides a gypsum self-leveling mortar, which adopts the following technical scheme:
the gypsum self-leveling mortar is prepared from the following raw materials in parts by weight: 500-600 parts of phosphogypsum, 200-300 parts of modified carbonized rice hulls, 150-200 parts of fine aggregates, 1-2 parts of stabilizing agents, 0.5-1 part of water reducing agents and 220-300 parts of water.
By adopting the technical scheme, the carbonized rice hulls have the characteristics of light weight and low heat conductivity, so that the heat conductivity coefficient of the gypsum self-leveling mortar can be reduced, and the heat insulation performance of the gypsum self-leveling mortar is improved, so that the requirements of people on indoor building decoration are met; the modified carbonized rice hulls can form a porous structure, so that the heat insulation performance of the gypsum self-leveling mortar is further enhanced, the strength and the sound insulation performance of the gypsum self-leveling mortar can be improved, the gypsum self-leveling mortar has stronger market competitiveness, and meanwhile, fine aggregate can be filled in the porous structure formed by the partially modified carbonized rice hulls, so that the compressive strength of the modified carbonized rice hulls is enhanced, and the compressive strength of the gypsum self-leveling mortar after being condensed is enhanced; the carbonized rice hull is hydrated to generate hydroxide, so that acidic substances generated in the hydration of the phosphogypsum can be neutralized, and the good service performance of the gypsum self-leveling mortar is maintained. The industrial solid waste phosphogypsum can be used for realizing the resource recycling of the phosphogypsum, reducing pollution and protecting the environment, and the water reducing agent and the stabilizing agent can improve the compressive strength of the gypsum self-leveling mortar after the gypsum self-leveling mortar is condensed.
Optionally, the modification method of the carbonized rice hulls comprises the following steps: 1) Uniformly stirring and mixing the carbonized rice hulls, the calcined kaolin, the calcium carbonate and the water, wherein the weight ratio of the carbonized rice hulls to the calcined kaolin to the calcium carbonate to the water is 1 (0.5-1.5) to (0.2-0.5) to (0.5-0.8), so as to prepare a first mixture; 2) Adding water glass into the first mixture, stirring and mixing uniformly, wherein the addition amount of the water glass is 2-3% of the total weight of the first mixture, and preparing a second mixture; 3) Microwave heating the second mixture for 20-25min to obtain porous material; 4) And grinding the porous material through a 600-800 mesh screen to obtain the modified carbonized rice hull.
By adopting the technical scheme, the calcined kaolin has stronger binding power and can be better fused with the carbonized rice hulls, and meanwhile, the calcined kaolin has good chemical stability and can improve the durability of the modified carbonized rice hulls, so that the durability of the gypsum self-leveling mortar is enhanced; the water glass can improve the bonding strength between the carbonized rice hull particles and the calcined kaolin, so that the strength of the carbonized rice hull particles is increased, the calcium carbonate generates active calcium oxide and carbon dioxide gas under the condition of microwave heating, the active calcium oxide reacts with silicon dioxide in the calcined kaolin to produce calcium silicate, the effect of ionic bonds is increased in the modified carbonized rice hulls, the mechanical strength of the modified carbonized rice hulls is enhanced, and more porous structures are generated in the materials by the carbon dioxide; the porous material is ground and sieved, so that the full hydration of the modified carbonized rice hulls can be ensured, and the compressive strength of the gypsum self-leveling mortar after the gypsum self-leveling mortar is condensed is improved.
Optionally, 50-70 parts of vitrified micro bubbles are also included.
By adopting the technical scheme, the vitrified micro bubbles have excellent heat insulation, fire prevention and sound absorption performances, so that the heat insulation, sound insulation and fire prevention performances of the gypsum self-leveling mortar can be further enhanced, the shrinkage rate of the mortar can be reduced, and the comprehensive performance of the gypsum self-leveling mortar after condensation is improved.
Optionally, the wood fiber composite material also comprises 50-80 parts of modified wood fiber.
By adopting the technical scheme, the wood fiber has excellent heat preservation, heat insulation and sound insulation properties, can further enhance the heat preservation, sound insulation and fire resistance properties of the gypsum self-leveling mortar, and has good flexibility and dispersibility, so that the compressive strength of the gypsum self-leveling mortar after being condensed is improved, and the possibility of cracking of the gypsum self-leveling mortar after being condensed is reduced. The modified wood fiber not only can enhance the bonding degree between the wood fiber and other raw materials, but also can reduce the water absorption of the wood fiber, so that water in the mortar is uniformly dispersed, and the mortar is not easy to crack.
Optionally, the modification method of the modified wood fiber comprises the following steps: a) Uniformly mixing sodium hydroxide and diethanol amine, wherein the mass ratio of the sodium hydroxide to the diethanol amine is 1:3, so as to obtain a pretreatment solution; b) Adding the wood fiber into the pretreatment solution, and freezing for 1-2h at-15 ℃ to-10 ℃ to obtain the modified wood fiber, wherein the addition amount of the wood fiber is consistent with that of the sodium hydroxide.
By adopting the technical scheme, the wood fiber is treated by the sodium hydroxide and the diethanolamine and then is subjected to freezing treatment, so that the reaction activity of the wood fiber is improved, the water absorption rate of the wood fiber can be reduced, the water in the mortar is uniformly dispersed, and the mortar is not easy to crack.
Optionally, 80-100 parts of quicklime is also included.
By adopting the technical scheme, calcium hydroxide can be generated by hydration of the quick lime, and acidic substances generated by hydration of the phosphogypsum can be neutralized, so that the mortar is close to neutrality, and the utilization performance of the mortar is improved; meanwhile, calcium hydroxide can react with phosphogypsum and fine aggregate to generate a ettringite system, so that the compressive strength of the mortar is enhanced.
Optionally, the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the polycarboxylate superplasticizer can reduce the water-cement ratio, improve the fluidity of mortar and reduce the segregation of the mortar, thereby ensuring the good use performance of the mortar.
Optionally, the stabilizer is cellulose ether.
By adopting the technical scheme, the cellulose ether can prevent the mortar from bleeding, reduce the segregation of the mortar and contribute to the gypsum self-leveling mortar to form a more uniform structure, thereby improving the bonding strength.
In a second aspect, the application provides a preparation method of gypsum self-leveling mortar, which adopts the following technical scheme: a preparation method of gypsum self-leveling mortar comprises the step of uniformly stirring phosphogypsum, modified carbonized rice hulls, fine aggregate, a stabilizer, a water reducing agent and water to obtain the gypsum self-leveling mortar.
By adopting the technical scheme, the prepared gypsum self-leveling mortar can realize the reutilization of industrial solid waste phosphogypsum, and the resources are saved, and the modified carbonized rice husk can not only improve the heat insulation performance of the mortar, but also improve the compressive strength of the mortar.
Optionally, the phosphogypsum is calcined for 1-2 hours at the temperature of 400-500 ℃ and then is stirred and mixed with other raw materials.
By adopting the technical scheme, the calcined phosphogypsum not only can effectively remove the influence of harmful impurities such as fluorine, organic matters and the like in the phosphogypsum, but also can improve the strength of the phosphogypsum after being hardened, thereby enhancing the compressive strength of mortar; the calcining temperature and time can be selected from calcining for 2 hours at 400 ℃, calcining for 1.5 hours at 450 ℃, calcining for 1.3 hours at 460 ℃ and calcining for 1 hour at 500 ℃, the production cost is increased when the temperature is too high, and the removal of harmful impurities such as fluorine and organic matters in the phosphogypsum is insufficient when the temperature is lower than 400 ℃, so that the use of the phosphogypsum in mortar is influenced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the modified carbonized rice hulls can form a porous structure, so that the heat insulation performance of the gypsum self-leveling mortar is further enhanced, the strength and the sound insulation performance of the gypsum self-leveling mortar can be improved, the gypsum self-leveling mortar has stronger market competitiveness, and meanwhile, fine aggregate can be filled in the porous structure formed by the partially modified carbonized rice hulls, so that the compressive strength of the modified carbonized rice hulls is enhanced, and the compressive strength of the gypsum self-leveling mortar after being condensed is enhanced;
2. the vitrified micro bubbles have excellent heat insulation, fire prevention and sound absorption performances, so that the heat insulation, sound insulation and fire prevention performances of the gypsum self-leveling mortar can be further enhanced, the shrinkage rate of the mortar can be reduced, and the comprehensive performance of the gypsum self-leveling mortar after condensation is improved;
3. the calcined phosphogypsum not only can effectively remove the influence of harmful impurities such as fluorine, organic matters and the like in the phosphogypsum, but also can improve the strength of the phosphogypsum after being hardened, thereby enhancing the compressive strength of the mortar.
Detailed Description
The present application is further described in detail with reference to the following examples, which are intended to illustrate: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and all the starting materials in the following examples were obtained from the ordinary commercial sources except for the specific conditions.
Examples
Example 1
The embodiment discloses gypsum self-leveling mortar, which comprises the following components in percentage by weight as shown in table 1:
table 1 examples 1-4 component contents of gypsum self-leveling mortars
Wherein the fine aggregate is fine sand, the water reducing agent is a polycarboxylic acid water reducing agent, and the stabilizing agent is cellulose ether;
the preparation method of the modified carbonized rice hull comprises the following steps: 1) Uniformly stirring and mixing 200g of carbonized rice hulls, 100g of calcined kaolin, 40g of calcium carbonate and 100g of water to prepare a first mixture; 2) Adding 8.8g of water glass into the first mixture, and stirring and mixing uniformly to obtain a second mixture; 3) Microwave heating the second mixture for 20min to obtain porous material; 4) Grinding the porous material through a 600-mesh screen to obtain modified carbonized rice hulls;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducer and the water according to the above dosage to obtain the gypsum self-leveling mortar.
Example 2
The embodiment discloses gypsum self-leveling mortar, which comprises the following components in percentage by weight as shown in table 1;
wherein the fine aggregate is fine sand, the water reducing agent is a polycarboxylic acid water reducing agent, and the stabilizing agent is cellulose ether;
the preparation method of the modified carbonized rice hull comprises the following steps: uniformly stirring and mixing 200g of carbonized rice hulls, 300g of calcined kaolin, 100g of calcium carbonate and 160g of water to prepare a first mixture; 2) Adding 22.8g of water glass into the first mixture, and stirring and mixing uniformly to obtain a second mixture; 3) Microwave heating the second mixture for 25min to obtain porous material; 4) Grinding the porous material through a 800-mesh screen to obtain modified carbonized rice hulls;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducer and the water according to the above dosage to obtain the gypsum self-leveling mortar.
Example 3
The embodiment discloses gypsum self-leveling mortar, which comprises the following components in percentage by weight as shown in table 1;
wherein the fine aggregate is fine sand, the water reducing agent is a polycarboxylic acid water reducing agent, and the stabilizing agent is cellulose ether;
the preparation method of the modified carbonized rice hull comprises the following steps: uniformly stirring and mixing 200g of carbonized rice hulls, 200g of calcined kaolin, 60g of calcium carbonate and 140g of water to prepare a first mixture; 2) Adding 15g of water glass into the first mixture, and stirring and mixing uniformly to obtain a second mixture; 3) Microwave heating the second mixture for 22min to obtain porous material; 4) Grinding the porous material through a 700-mesh screen to obtain modified carbonized rice hulls;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducer and the water according to the above dosage to obtain the gypsum self-leveling mortar.
Example 4
The embodiment discloses gypsum self-leveling mortar, which comprises the following components in percentage by weight as shown in table 1;
wherein the fine aggregate is fine sand, the water reducing agent is a polycarboxylic acid water reducing agent, and the stabilizing agent is cellulose ether;
the preparation method of the modified carbonized rice hull comprises the following steps: uniformly stirring and mixing 200g of carbonized rice hulls, 140g of calcined kaolin, 60g of calcium carbonate and 120g of water to prepare a first mixture; 2) Adding 11.4g of water glass into the first mixture, and stirring and mixing uniformly to obtain a second mixture; 3) Microwave heating the second mixture for 24min to obtain porous material; 4) Grinding the porous material through a 700-mesh screen to obtain modified carbonized rice hulls;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducer and the water according to the above dosage to obtain the gypsum self-leveling mortar.
Example 5
This example differs from example 4 in that: 50g of vitrified micro bubbles are added into gypsum self-leveling mortar;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducing agent, the vitrified micro bubbles and the water to obtain the gypsum self-leveling mortar.
Example 6
This example differs from example 4 in that: 70g of vitrified micro bubbles are added into gypsum self-leveling mortar;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducing agent, the vitrified micro bubbles and the water to obtain the gypsum self-leveling mortar.
Example 7
This example differs from example 4 in that: 62g of vitrified micro bubbles are added into gypsum self-leveling mortar;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring the phosphogypsum, the carbonized rice hulls, the fine aggregate, the stabilizer, the water reducing agent, the vitrified micro bubbles and the water to obtain the gypsum self-leveling mortar.
Example 8
This example differs from example 7 in that: 50g of modified wood fiber is added into gypsum self-leveling mortar;
the modification method of the modified wood fiber comprises the following steps: a) Uniformly mixing 100g of sodium hydroxide and 300g of diethanolamine to obtain a pretreatment solution; b) Adding 100g of wood fiber into the pretreatment solution, and freezing for 1h at-15 ℃ to obtain modified wood fiber;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring phosphogypsum, carbonized rice hulls, fine aggregate, a stabilizer, a water reducing agent, vitrified micro bubbles, modified wood fiber and water to obtain the gypsum self-leveling mortar.
Example 9
This example differs from example 7 in that: 80g of modified wood fiber is added into gypsum self-leveling mortar;
the modification method of the modified wood fiber comprises the following steps: a) Uniformly mixing 100g of sodium hydroxide and 300g of diethanolamine to obtain a pretreatment solution; b) Adding 100g of wood fiber into the pretreatment solution, and freezing for 2h at-10 ℃ to obtain modified wood fiber;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring phosphogypsum, carbonized rice hulls, fine aggregate, a stabilizer, a water reducing agent, vitrified micro bubbles, modified wood fiber and water to obtain the gypsum self-leveling mortar.
Example 10
This example differs from example 7 in that: 60g of modified wood fiber is added into gypsum self-leveling mortar;
the modification method of the modified wood fiber comprises the following steps: a) Uniformly mixing 100g of sodium hydroxide and 300g of diethanolamine to obtain a pretreatment solution; b) Adding 100g of wood fiber into the pretreatment solution, and freezing for 1.3h at-13 ℃ to obtain modified wood fiber;
the preparation method of the gypsum self-leveling mortar comprises the following steps: uniformly stirring phosphogypsum, carbonized rice hulls, fine aggregate, a stabilizer, a water reducing agent, vitrified micro bubbles, modified wood fiber and water to obtain the gypsum self-leveling mortar.
Example 11
The present embodiment differs from embodiment 10 in that: the preparation method of the gypsum self-leveling mortar comprises the following steps: firstly, the phosphogypsum is calcined for 1.5h at the temperature of 450 ℃ and then is stirred and mixed with other raw materials.
Comparative example
Comparative example 1
This comparative example differs from example 1 in that: modified carbonized rice hulls are not added into the gypsum self-leveling mortar.
Comparative example 2
This comparative example differs from example 1 in that: the carbonized rice husk in the gypsum self-leveling mortar is not modified.
Performance test
1. Compressive Strength and shrinkage Properties testing
The gypsum self-leveling mortars prepared by the above examples and comparative examples were tested for compressive strength and shrinkage rate properties according to JC/T1023-2007 Gypsum based self-leveling mortars, the test results are shown in Table 2.
2. Thermal conductivity measurement
The thermal conductivity of the gypsum self-leveling mortars prepared in the above examples and comparative examples was measured by using a flat plate heat flow meter method according to GB/T10295-2008 "Heat flow meter method for measuring thermal insulation Material Stable thermal resistance and related characteristics" and ASTM C518-04 "test method for measuring Stable thermal flux and Heat transfer characteristics by Heat flow meter method", and the test results are shown in Table 2.
TABLE 2 test results record table
The analysis of the embodiment 1-4, the comparative example 1 and the table 2 is combined, and after the modified carbonized rice hulls with proper amount are added, the heat conductivity coefficient of the gypsum self-leveling mortar is obviously reduced compared with the heat conductivity coefficient of the gypsum self-leveling mortar without the modified carbonized rice hulls, which shows that the heat insulation performance of the gypsum self-leveling mortar is obviously improved by the modified carbonized fibers; the appropriate dosage of each raw material in the gypsum self-leveling mortar not only can improve the compressive strength of the gypsum self-leveling mortar, but also can reduce the shrinkage rate;
the analysis of the embodiment 1-4, the comparative example 2 and the table 2 is combined, the modification of the carbonized rice hulls is beneficial to further improving the heat preservation performance of the gypsum self-leveling mortar, and the results show that after the carbonized rice hulls are modified, the porous structure generated on the surfaces of the carbonized rice hulls is beneficial to further reducing the heat conductivity coefficient of the gypsum self-leveling mortar, and the phosphogypsum can be filled in partial pores to enhance the compressive strength of the gypsum self-leveling mortar;
by combining the analysis of the examples 4-7 and the table 2, the proper amount of the vitrified micro bubbles added into the gypsum self-leveling mortar is beneficial to improving the heat insulation performance of the gypsum self-leveling mortar; the heat insulation performance of the gypsum self-leveling mortar can be further enhanced by adding a proper amount of modified wood fiber into the gypsum self-leveling mortar, the modified wood fiber can not only improve the reaction activity of the wood fiber, so that the connection among the phosphogypsum, the modified carbonized rice hulls and the fine aggregate is firmer, the reaction activity of the wood fiber is enhanced, but also the water absorption rate of the wood fiber can be reduced, the compressive strength of the gypsum self-leveling mortar is improved, the water absorption rate of the wood fiber can be reduced, the water in the mortar is uniformly dispersed, and the mortar is not easy to crack;
by combining the examples 10-11 and the analysis in table 2, it can be found that calcining phosphogypsum can improve the compactness of the interior of the phosphogypsum, thereby improving the compressive strength of the gypsum self-leveling mortar.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A gypsum self-leveling mortar is characterized in that: the feed is prepared from the following raw materials in parts by weight: 500-600 parts of phosphogypsum, 200-300 parts of modified carbonized rice hulls, 150-200 parts of fine aggregates, 1-2 parts of stabilizing agents, 0.5-1 part of water reducing agents and 220-300 parts of water;
the modification method of the carbonized rice hulls comprises the following steps: 1) Uniformly stirring and mixing the carbonized rice hulls, the calcined kaolin, the calcium carbonate and the water, wherein the weight ratio of the carbonized rice hulls to the calcined kaolin to the calcium carbonate to the water is 1 (0.5-1.5) to (0.2-0.5) to (0.5-0.8), so as to prepare a first mixture; 2) Adding water glass into the first mixture, stirring and mixing uniformly, wherein the addition amount of the water glass is 2-3% of the total weight of the first mixture, and preparing a second mixture; 3) Microwave heating the second mixture for 20-25min to obtain porous material; 4) And grinding the porous material through a 600-800 mesh screen to obtain the modified carbonized rice hull.
2. The gypsum self-leveling mortar of claim 1, wherein: also comprises 50-70 parts of vitrified micro bubbles.
3. The gypsum self-leveling mortar of claim 2, wherein: also comprises 50-80 parts of modified wood fiber.
4. The gypsum self-leveling mortar of claim 3, wherein: the modification method of the modified wood fiber comprises the following steps: a) Uniformly mixing sodium hydroxide and diethanolamine at the mass ratio of 1:3 to obtain a pretreatment solution; b) Adding the wood fiber into the pretreatment solution, and freezing for 1-2h at-15 ℃ to-10 ℃ to obtain the modified wood fiber, wherein the addition amount of the wood fiber is consistent with that of the sodium hydroxide.
5. The gypsum self-leveling mortar of claim 4, wherein: 80-100 parts of quicklime.
6. The gypsum self-leveling mortar of claim 5, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
7. The gypsum self-leveling mortar of claim 6, wherein: the stabilizer is cellulose ether.
8. The method for preparing the gypsum self-leveling mortar of claim 1, which is characterized by comprising the following steps: uniformly stirring the phosphogypsum, the modified carbonized rice hulls, the fine aggregate, the stabilizer, the water reducing agent and the water to obtain the gypsum self-leveling mortar.
9. The method for preparing the gypsum self-leveling mortar according to claim 8, wherein the method comprises the following steps: firstly calcining the phosphogypsum for 1-2h at the temperature of 400-500 ℃, and then stirring and mixing the phosphogypsum with other raw materials.
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|---|---|---|---|---|
| AU757242B2 (en) * | 1999-01-18 | 2003-02-06 | Contract Research & Development (M) Sdn. Bhd. | Use of vegetative material as a filler in composite materials |
| CN103467008B (en) * | 2013-08-05 | 2016-03-09 | 安徽中龙建材科技有限公司 | A kind of air-entrained concrete building block adding bamboo carbon powder |
| CN107663035B (en) * | 2017-10-18 | 2020-05-22 | 浙江大学 | Preparation method of aluminum ash based geopolymer cementing material |
| CN111908939A (en) * | 2020-06-23 | 2020-11-10 | 上海暖丰保温材料有限公司 | Aerated concrete block and preparation method thereof |
| KR20220079238A (en) * | 2020-12-04 | 2022-06-13 | (주)알에스건재 | Buffer mortar composition using fine rice husk aggregate |
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