CN111825406A - Phosphogypsum-based self-leveling mortar - Google Patents
Phosphogypsum-based self-leveling mortar Download PDFInfo
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- CN111825406A CN111825406A CN202010741616.XA CN202010741616A CN111825406A CN 111825406 A CN111825406 A CN 111825406A CN 202010741616 A CN202010741616 A CN 202010741616A CN 111825406 A CN111825406 A CN 111825406A
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/145—Phosphorus slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses phosphogypsum-based self-leveling mortar which is prepared from the following raw materials: 30-50 parts of alpha-type high-strength gypsum, 0-20 parts of building gypsum powder, 5-15 parts of machine-made sand, 35-45 parts of phosphorite tailing slag, 1-5 parts of fly ash, 0.1-0.5 part of cement, 0.1-0.2 part of water reducing agent, 0.05-0.1 part of water retaining agent, 0.05-0.1 part of defoaming agent and 0.05-0.1 part of redispersible latex powder. The phosphogypsum-based self-leveling mortar takes the phosphogypsum and the phosphorite tailing slag which are large industrial solid wastes as main cementing materials and aggregates, so that the resource and value utilization of the solid wastes are realized, the pollution of the solid wastes to soil and water resources is reduced, the land resources are saved, and the comprehensive cost of self-leveling is reduced. The fluidity is good, the better embodiment of the method has better fluidity under the water-cement ratio of about 1:5, and higher strength can be formed within 1d under natural conditions; after being dried, the anti-breaking strength reaches more than 8Mpa, the compressive strength reaches more than 30Mpa, and the fireproof heat-insulating material has good fireproof and heat-insulating properties.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to phosphogypsum-based self-leveling mortar.
Background
Phosphogypsum is a solid byproduct generated in the wet-process phosphoric acid production process, 4-5 tons of phosphogypsum can be generated when 1 ton of phosphorus pentoxide is produced, the total stacking amount of the phosphogypsum all over the country exceeds 6 hundred million tons, and the phosphogypsum is increased at the speed of about 5000 ten thousand tons every year. The average utilization rate of the phosphogypsum in China is less than 50, a large amount of stockpiling of the phosphogypsum not only occupies land resources, but also impurities such as phosphorus, fluorine and the like in the phosphogypsum can enter soil along with rainwater washing, so that the soil and underground water are polluted. But after the phosphogypsum is purified, the phosphogypsum can be used for producing building gypsum powder and alpha-type high-strength gypsum and regenerating various gypsum building materials, and is an important way for dissolving the phosphogypsum.
The phosphorite tailing slag is the waste low-grade phosphorite slag in the phosphorite mining and mineral dressing process. It currently lacks an efficient way of utilization and is stockpiled in large quantities in tailings ponds.
The gypsum-based self-leveling mortar is a ground material which is prepared by using semi-hydrated or anhydrous gypsum as a main cementing material, adding fine aggregate, a filler and an additive, and has fluidity after being stirred with water or can flow and level by being paved with a little auxiliary materials. The concrete has good fluidity and stability, high early strength, high construction speed and low labor intensity, and is an important development direction of the ground construction of modern buildings.
Compared with the traditional cement-based self-leveling, the gypsum-based self-leveling can generate micro-expansion in the setting and hardening process, and the cracking phenomenon caused by over-shrinkage can not occur; because the gypsum material is fast in setting and hardening, the gypsum-based self-leveling material can form higher strength and can reach the people in a short time without long-time maintenance. The hardened gypsum-based self-leveling floor tile has good heat insulation performance, can be used as a leveling material in a floor heating system, has a self-breathing function, can automatically adjust the moisture content in air, and improves the living comfort level. However, the final strength of gypsum used as an air-setting cementing material is far from the final strength of cement, so that most gypsum-based self-leveling materials which use pure building gypsum powder as a cementing material need to improve the performance of the material by adding various additives, and high-quality river sand or quartz sand is needed to be used as an aggregate to ensure the product performance, so that the strength and the water resistance of the gypsum-based self-leveling material are still not ideal while the cost and the exploitation difficulty of raw materials are increased.
In chinese patent 201510054945.6, a phosphogypsum-based self-leveling mortar and a preparation method thereof are disclosed, wherein alpha-type high-strength gypsum and building gypsum powder are used as cementing materials, fine river sand is used as aggregate, and a small amount of gypsum whiskers, cement, mineral powder and 3 types of additives are compounded to prepare the self-leveling material. The method uses alpha-type high-strength gypsum, but uses fine river sand as aggregate, so that the cost is high, the method is not beneficial to environmental protection, and the dry strength of the product is lower than 25 Mpa.
In chinese patent 201710226715.2, a phosphogypsum-based self-leveling mortar is disclosed, the self-leveling mortar also uses phosphogypsum as a main raw material, the dry compressive strength reaches 30Mpa, and the used aggregate is quartz sand of about 150 meshes, which also faces the problems of high cost and difficult mining.
Based on the background, the invention develops a preparation method of phosphogypsum-based self-leveling mortar, wherein alpha-type high-strength gypsum produced by singly using phosphogypsum or alpha-type high-strength gypsum produced by compositely using phosphogypsum and building gypsum powder are jointly used as cementing materials, the preparation method has the advantages of less water consumption and higher strength, the main raw materials of phosphogypsum and the tailing slag of phosphorite, which is a main aggregate, are solid industrial wastes, the raw material cost is low, the comprehensive performance of the product is high, the reclamation and the valuable utilization of industrial solid wastes are realized, the resources are saved, and the environment is benefited.
Disclosure of Invention
The invention provides phosphogypsum-based self-leveling mortar, which is prepared from the following raw materials: alpha type high-strength gypsum, building gypsum powder, machine-made sand, phosphorite tailing slag, fly ash, cement, a water reducing agent, a water-retaining agent, a defoaming agent and redispersible latex powder.
As an embodiment of the invention, the feed additive is composed of the following raw materials in parts by weight: 30-50 parts of alpha-type high-strength gypsum, 0-20 parts of building gypsum powder, 5-15 parts of machine-made sand, 35-45 parts of phosphorite tailing slag, 1-5 parts of fly ash, 0.1-0.5 part of cement, 0.1-0.2 part of water reducing agent, 0.05-0.1 part of water retaining agent, 0.05-0.1 part of defoaming agent and 0.05-0.1 part of redispersible latex powder.
As an embodiment of the invention, the strength grade of the alpha-type high-strength gypsum is higher than the alpha 25 grade requirement specified in JC/T2038-2010 alpha-type high-strength gypsum.
As an embodiment of the present invention, the machine-made sand has a particle size of less than 2.36 mm; the fineness modulus is 2.0-3.0.
As an embodiment of the invention, the particle size of the phosphate ore tailing slag is less than 0.30 mm.
As an embodiment of the present invention, the cement is portland cement or aluminate cement.
In one embodiment of the present invention, the water reducing agent is a polycarboxylic acid type high efficiency water reducing agent.
As an embodiment of the present invention, the water retaining agent is hydroxypropyl methyl cellulose ether.
As an embodiment of the invention, the defoaming agent is a powder defoaming agent consisting of hydrocarbon, polyethylene glycol and amorphous silicon dioxide.
In one embodiment of the invention, the redispersible latex powder is a copolymer powder of vinyl acetate and ethylene.
Has the advantages that:
compared with the existing gypsum-based self-leveling material, the main raw materials of the phosphogypsum and the phosphorite tailing slag are bulk solid wastes, so that the recycling of solid waste resources is realized; the gradation of the aggregate is adjusted by using the machine-made sand, so that natural river sand does not need to be mined, and the environment is protected; the product has good fluidity and high strength, and all indexes are higher than the requirements of the current practical standard JC/T1023 + 2007 gypsum-based self-leveling mortar, wherein the dry compressive strength of the better product can reach more than 30 Mpa.
Detailed Description
The present invention will be described in more detail with reference to the following examples. The technical solutions in the embodiments of the present invention are clearly described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides phosphogypsum-based self-leveling mortar, which is prepared from the following raw materials: alpha type high-strength gypsum, building gypsum powder, machine-made sand, phosphorite tailing slag, fly ash, cement, a water reducing agent, a water-retaining agent, a defoaming agent and redispersible latex powder.
As an embodiment of the invention, the feed additive is composed of the following raw materials in parts by weight: 30-50 parts of alpha-type high-strength gypsum, 0-20 parts of building gypsum powder, 5-15 parts of machine-made sand, 35-45 parts of phosphorite tailing slag, 1-5 parts of fly ash, 0.1-0.5 part of cement, 0.1-0.2 part of water reducing agent, 0.05-0.1 part of water retaining agent, 0.05-0.1 part of defoaming agent and 0.05-0.1 part of redispersible latex powder.
Alpha-type high-strength gypsum
In the invention, the alpha-type high-strength gypsum is prepared by using water-washed phosphogypsum as a raw material and performing autoclaved crystal transformation, the initial setting time is 20-40 min, and the strength grade is higher than the alpha 25 grade requirement specified in JC/T2038-.
Building gypsum powder
In the invention, the building gypsum powder is prepared by taking water-washed phosphogypsum as a raw material through a two-step method of drying and calcining, and each index meets the requirement of more than 2.0 grade in the national standard GB/T9776-2008 building gypsum powder.
The alpha-type high-strength gypsum is mixed with the building gypsum powder to be used as a cementing material, the alpha-type high-strength gypsum has good crystallinity, the crystals are prismatic, the water requirement is low, and the strength is high; the building gypsum powder takes beta-type semi-hydrated gypsum with poor crystallinity as a main component, has the advantages of fast setting and hardening, large water demand, relatively low strength, convenient production and low cost. The self-leveling material and the composite material are mixed for use, so that the cost of the self-leveling material is reduced as much as possible on the premise of higher strength.
Machine-made sand
In the invention, the grain diameter of the machine-made sand is less than 2.36mm, and the fineness modulus is 2.0-3.0.
In the invention, the main grain diameter of the machine-made sand is 0.3-0.35 mm.
Tailing of phosphate ore
In the invention, the phosphorite tailing slag is industrial solid waste generated in the phosphorite mining and mineral dressing process.
In the invention, the particle size of the phosphorite tailing slag is less than 0.30 mm; and the particle size of the phosphorite tailing slag is mainly 0.05-0.10 mm.
As an embodiment of the invention, the phosphorite tailing slag is spherical fine sand.
In the invention, the machine-made sand is mixed with the phosphorite tailing slag to be used as the aggregate. The existing self-leveling materials mostly use river sand as main aggregate, but in recent years, the exploitation of the river sand is limited, and the cost is continuously increased. The machine-made sand is prepared by taking the mountain stone as a raw material and crushing the mountain stone by a machine, does not pollute the environment during mining, has low production cost, but has less round and smooth particle shape than river sand, poor fluidity and poor gradation. The phosphate rock tailing slag is another solid waste of a wet-process phosphoric acid process, an effective utilization way is not available at present, the phosphate rock tailing slag is in a microbead shape, the average grain size is below 0.30mm, and the phosphate rock tailing slag has good flowing property but cannot be directly used as aggregate. The self-leveling material with good fluidity and smooth and flat surface can be prepared by mixing the machine-made sand and the phosphorite tailing slag as aggregate and adjusting the gradation by adjusting the use proportion of the machine-made sand and the phosphorite tailing slag.
Fly ash
In the invention, the fly ash is hollow micro-beads, and the main particle size range of the fly ash is 1-100 mu m; and 80% of the particles have a particle size range of 80-90 μm; and 20% of the particles have a particle size of 10 to 80 μm.
Cement
In the invention, the cement is ordinary portland cement or aluminate cement.
Most of the fly ash particles are hollow microspheres, the fluidity of self-leveling can be properly improved, the cost is low, and the whole cost of the self-leveling material is favorably reduced. In addition, the main component of the fly ash is amorphous active SiO2With Al in cement2O3And Ca (OH) generated after hydration of cement2The calcium and the aluminum react together to generate ettringite (3CaO ∙ Al)2O3∙3CaSO4∙32H2O) is filled in the material gap, so that the volume shrinkage generated in the drying process of self-leveling is compensated, and the shrinkage rate of self-leveling is reduced. In addition, cement, as a hydraulic binder, can improve the water resistance of gypsum-based materials to some extent. The cement is good in using effect of the quick-hardening early-strength aluminate cement, the mixing amount of the quick-hardening early-strength aluminate cement is not too much, otherwise, the hydration hardening process of gypsum is greatly influenced, and the later strength is not favorably formed.
Water reducing agent
The water reducing agent is a concrete admixture capable of reducing the water consumption for mixing under the condition of maintaining the slump constant of concrete basically. Most of them are anionic surfactants, such as lignosulfonate and naphthalene sulfonate formaldehyde polymer. After the concrete mixture is added, the dispersion effect on cement particles is achieved, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.
In the invention, the water reducing agent is selected from an FDN water reducing agent and a polycarboxylic acid water reducing agent; more preferably a polycarboxylic acid type high efficiency water reducing agent.
Water-retaining agent
In the invention, the water-retaining agent is selected from one or more of methyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose, phenyl cellulose and modified starch.
As an embodiment of the present invention, the water retaining agent is selected from low viscosity hydroxypropyl methyl cellulose ethers.
In a preferred embodiment of the present invention, the low-viscosity hydroxypropylmethylcellulose ether has a viscosity of 100-1000 mpa.s.
Defoaming agent
In the invention, the defoaming agent is a powder defoaming agent consisting of hydrocarbon, polyethylene glycol and amorphous silicon dioxide.
Redispersible latex powder
In the invention, the redispersible latex powder is selected from vinyl acetate and ethylene copolymer rubber powder, ethylene and vinyl chloride and vinyl metasilicate ternary copolymer rubber powder, vinyl acetate and ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, vinyl acetate and higher fatty acid vinyl ester copolymer rubber powder, acrylic ester and styrene copolymer rubber powder, vinyl acetate and acrylic ester and higher fatty acid vinyl ester ternary copolymer rubber powder and vinyl acetate homopolymerization rubber powder.
In a preferred mode of the invention, the redispersible latex powder is a copolymer rubber powder of vinyl acetate and ethylene.
The polycarboxylate superplasticizer mainly provides electrostatic repulsion action through carboxyl groups on a main chain, and a polyether structure on a side chain provides steric hindrance action, so that the flowing property of the self-leveling material is enhanced, the water consumption is reduced, and the strength is improved. In addition, according to the difference of the main chain polymerization degree, the side chain length and the acid-ether ratio of the polycarboxylic acid water reducing agent, part of the polycarboxylic acid water reducing agent can also influence the setting time of the gypsum to play a role in retarding. The low viscosity cellulose ether has the functions of reducing the water loss rate of self-leveling, enhancing the water retention performance of the cellulose ether, and reducing the influence on the self-leveling flow performance as much as possible. The defoaming agent functions to reduce the surface tension of the material, thereby suppressing the use of a water reducing agent and the generation of bubbles by stirring. The redispersible latex powder generates a continuous film after meeting water to form an interpenetrating network film structure, plays a role in cementing, and improves the self-leveling impermeability and water resistance.
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1:
the preparation method of the phosphogypsum-based self-leveling mortar comprises the following components in parts by weight:
50 parts of alpha-type high-strength gypsum, 0 part of building gypsum powder, 18 parts of machine-made sand, 30 parts of phosphorite tailing slag, 2 parts of fly ash, 0.3 part of cement, 0.10 part of water reducing agent, 0.05 part of water-retaining agent, 0.08 part of defoaming agent and 0.05 part of redispersible latex powder. Wherein the strength of the alpha-type high-strength gypsum reaches the alpha 40 grade requirement.
The phosphogypsum-based self-leveling mortar is added with water according to the water-cement ratio of 0.22 and stirred uniformly to prepare self-leveling slurry for construction.
Wherein the grain size of the machine-made sand is less than 2.36mm, and the main grain size is 0.3-0.35 mm; the fineness modulus is 2.0-3.0.
The particle size of the phosphorite tailing slag is less than 0.30 mm; the particle size of the phosphorite tailing slag is mainly 0.05-0.10 mm; and is spherical fine sand.
The fly ash is hollow micro-beads, and the main particle size range of the fly ash is 1-100 mu m; and 80% of the particles have a particle size range of 80-90 μm; and 20% of the particles have a particle size of 10 to 80 μm.
The cement is ordinary portland cement.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and specifically is a P29 water reducing agent purchased from Guangdong lake science and technology Co.
The water-retaining agent is hydroxypropyl methyl cellulose ether, the viscosity of the water-retaining agent is 500mPa.s at 25 ℃, and the water-retaining agent is purchased from Guangdong Longhu scientific Co.
The defoaming agent is a powder defoaming agent P803 consisting of hydrocarbon, polyethylene glycol and amorphous silicon dioxide, and is produced by Germany Ming Ling chemical industry.
The redispersible latex powder is vinyl acetate and ethylene copolymerized rubber powder, and particularly is the redispersible latex powder 328N produced by German Wake chemical production.
And (3) performance testing: the detection shows that the basic properties of the material are as follows: 30min fluidity loss of 0mm, initial setting time of 182min, final setting time of 202min, 1d flexural strength of 4.0MPa, 1d compressive strength of 18.0MPa, dry flexural strength of 10.2MPa, dry compressive strength of 41.3MPa, tensile bonding strength of 1.3MPa, and shrinkage of 0.02%.
Example 2:
the difference from the embodiment 1 is that the embodiment provides a preparation method of phosphogypsum-based self-leveling mortar, which comprises the following components in parts by weight:
35 parts of alpha-type high-strength gypsum, 15 parts of building gypsum powder, 18 parts of machine-made sand, 30 parts of phosphorite tailing slag, 2 parts of fly ash, 0.3 part of cement, 0.25 part of water reducing agent, 0.05 part of water-retaining agent, 0.08 part of defoaming agent and 0.05 part of redispersible latex powder. Wherein the strength of the alpha-type high-strength gypsum reaches the requirement of alpha 25 grade.
The phosphogypsum-based self-leveling mortar is added with water according to the water-cement ratio of 0.24 and stirred uniformly to prepare self-leveling slurry for construction.
And (3) performance testing: the detection shows that the basic properties of the material are as follows: 30min fluidity loss of 0mm, initial setting time of 168min, final setting time of 192min, 1d flexural strength of 2.8MPa, 1d compressive strength of 12.0MPa, dry flexural strength of 7.8MPa, dry compressive strength of 27.3MPa, tensile bonding strength of 1.1MPa, and shrinkage of 0.00%.
Example 3:
the difference from the embodiment 1 is that the embodiment provides a preparation method of phosphogypsum-based self-leveling mortar, which comprises the following components in parts by weight:
40 parts of alpha-type high-strength gypsum, 10 parts of building gypsum powder, 18 parts of machine-made sand, 30 parts of phosphorite tailing slag, 2 parts of fly ash, 0.3 part of cement, 0.24 part of water reducing agent, 0.05 part of water-retaining agent, 0.08 part of defoaming agent and 0.05 part of redispersible latex powder. Wherein the strength of the alpha-type high-strength gypsum reaches the requirement of alpha 25 grade.
The phosphogypsum-based self-leveling mortar is added with water according to the water-cement ratio of 0.24 and stirred uniformly to prepare self-leveling slurry for construction.
And (3) performance testing: the detection shows that the basic properties of the material are as follows: 30min, fluidity loss of 0mm, initial setting time of 174min, final setting time of 198min, 1d flexural strength of 3.2MPa, 1d compressive strength of 14.8MPa, dry flexural strength of 8.3MPa, dry compressive strength of 31.1MPa, tensile bonding strength of 1.2MPa, and shrinkage of 0.01%.
Example 4:
the difference from the embodiment 1 is that the embodiment provides a preparation method of phosphogypsum-based self-leveling mortar, which comprises the following components in parts by weight:
40 parts of alpha-type high-strength gypsum, 10 parts of building gypsum powder, 3 parts of machine-made sand, 45 parts of phosphorite tailing slag, 2 parts of fly ash, 0.3 part of cement, 0.20 part of water reducing agent, 0.05 part of water-retaining agent, 0.08 part of defoaming agent and 0.05 part of redispersible latex powder. Wherein the strength of the alpha-type high-strength gypsum reaches the requirement of alpha 25 grade.
The phosphogypsum-based self-leveling mortar is added with water according to the water-cement ratio of 0.24 and stirred uniformly to prepare self-leveling slurry for construction.
And (3) performance testing: the detection shows that the basic properties of the material are as follows: 30min, 0mm fluidity loss, 158min initial setting time, 189min final setting time, 3.3MPa of 1d flexural strength, 15.1MPa of 1d compressive strength, 8.1MPa of dry flexural strength, 32.4MPa of dry compressive strength, 1.2MPa of tensile bonding strength and 0.02% of shrinkage.
Comparative example 1:
the difference from the embodiment 1 is that,
wherein the particle size of the machine-made sand is less than 0.30 mm; and the main particle size is 0.05-0.10 mm.
The particle size of the phosphorite tailing slag is less than 0.30 mm; the particle size of the phosphorite tailing slag is mainly 0.05-0.10 mm; and is spherical fine sand.
The fly ash is hollow micro-beads, and the main particle size range of the fly ash is 1-100 mu m; and 80% of the particles have a particle size range of 80-90 μm; and 20% of the particles have a particle size of 10 to 80 μm.
Comparative example 2:
the difference from example 1 is that:
wherein the main grain diameter of the phosphorite tailing slag is 0.3-0.35 mm; the fineness modulus is 2.0-3.0.
The grain size of the machine-made sand is less than 0.30 mm; the particle size of the machine-made sand is mainly 0.05-0.10 mm; and is spherical fine sand.
The fly ash is hollow micro-beads, and the main particle size range of the fly ash is 1-100 mu m; and 80% of the particles have a particle size range of 80-90 μm; and 20% of the particles have a particle size of 10 to 80 μm.
Comparative example 3:
the difference from example 1 is that:
the phosphorite tailing slag in the embodiment 1 is replaced by machine-made sand with the particle size of less than 0.30mm and mainly distributed in the range of 0.05-0.10 mm in an equivalent manner.
Performance testing
The test of the invention refers to the method of the industry standard JC/T1023 and 2007 gypsum-based self-leveling mortar.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, but rather, the present invention is intended to cover all modifications, equivalents, and improvements, which may fall within the spirit and scope of the present invention.
Claims (10)
1. The phosphogypsum-based self-leveling mortar is characterized by comprising the following preparation raw materials: alpha type high-strength gypsum, building gypsum powder, machine-made sand, phosphorite tailing slag, fly ash, cement, a water reducing agent, a water-retaining agent, a defoaming agent and redispersible latex powder.
2. The phosphogypsum-based self-leveling mortar of claim 1, which is characterized by comprising the following raw materials in parts by weight: 30-50 parts of alpha-type high-strength gypsum, 0-20 parts of building gypsum powder, 5-15 parts of machine-made sand, 35-45 parts of phosphorite tailing slag, 1-5 parts of fly ash, 0.1-0.5 part of cement, 0.1-0.2 part of water reducing agent, 0.05-0.1 part of water retaining agent, 0.05-0.1 part of defoaming agent and 0.05-0.1 part of redispersible latex powder.
3. The phosphogypsum-based self-leveling mortar of claim 1, wherein the strength grade of the alpha-type high-strength gypsum is higher than the alpha 25 grade requirement specified in JC/T2038-2010 alpha-type high-strength gypsum.
4. The phosphogypsum-based self-leveling mortar of claim 1, wherein the grain size of the machine-made sand is less than 2.36 mm; the fineness modulus is 2.0-3.0.
5. The phosphogypsum-based self-leveling mortar of claim 1, wherein the particle size of the phosphate rock tailing slag is less than 0.30 mm.
6. The phosphogypsum-based self-leveling mortar of claim 1, which is characterized in that the cement is portland cement or aluminate cement.
7. The phosphogypsum-based self-leveling mortar of claim 1, which is characterized in that the water-reducing agent is a polycarboxylic acid type high-efficiency water-reducing agent.
8. The phosphogypsum-based self-leveling mortar of claim 1, wherein the water retaining agent is hydroxypropyl methyl cellulose ether.
9. The phosphogypsum-based self-leveling mortar of claim 1, which is characterized in that the defoamer is a powder defoamer consisting of hydrocarbons, polyethylene glycol and amorphous silica.
10. The phosphogypsum-based self-leveling mortar of claim 1, which is characterized in that the redispersible latex powder is a copolymer powder of vinyl acetate and ethylene.
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| CN112299805A (en) * | 2020-11-04 | 2021-02-02 | 越秀联合(贵州)新材料有限公司 | Sand-free desulfurized gypsum self-leveling mortar and preparation method thereof |
| CN113004016A (en) * | 2021-03-08 | 2021-06-22 | 浙江忠信新型建材股份有限公司 | Gypsum-based self-leveling mortar capable of realizing pumping and preparation method thereof |
| CN113213875A (en) * | 2021-05-30 | 2021-08-06 | 贵州中能高新材料有限公司 | Floor composite type heat-preservation self-leveling mortar and preparation method thereof |
| CN114213095A (en) * | 2021-12-31 | 2022-03-22 | 江苏尼高科技有限公司 | Alkali-activated phosphogypsum self-leveling mortar |
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| CN115126189A (en) * | 2022-07-19 | 2022-09-30 | 贵州磷化绿色环保产业有限公司 | Construction method and construction surface structure of gypsum-based indoor terrace self-leveling concrete |
| CN115196936A (en) * | 2022-07-19 | 2022-10-18 | 贵州磷化绿色环保产业有限公司 | Gypsum-based indoor terrace self-leveling concrete prepared from phosphogypsum active powder and preparation method and application thereof |
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| CN112299805A (en) * | 2020-11-04 | 2021-02-02 | 越秀联合(贵州)新材料有限公司 | Sand-free desulfurized gypsum self-leveling mortar and preparation method thereof |
| CN113004016A (en) * | 2021-03-08 | 2021-06-22 | 浙江忠信新型建材股份有限公司 | Gypsum-based self-leveling mortar capable of realizing pumping and preparation method thereof |
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| CN114213095A (en) * | 2021-12-31 | 2022-03-22 | 江苏尼高科技有限公司 | Alkali-activated phosphogypsum self-leveling mortar |
| CN114538872A (en) * | 2022-01-11 | 2022-05-27 | 淮阴工学院 | Mine restoration ecological concrete based on phosphate rock tailings and preparation method and application thereof |
| WO2023213065A1 (en) * | 2022-05-06 | 2023-11-09 | 苏州市兴邦化学建材有限公司 | Gypsum-based ground tile bonding mortar and preparation method therefor |
| CN115126189A (en) * | 2022-07-19 | 2022-09-30 | 贵州磷化绿色环保产业有限公司 | Construction method and construction surface structure of gypsum-based indoor terrace self-leveling concrete |
| CN115196936A (en) * | 2022-07-19 | 2022-10-18 | 贵州磷化绿色环保产业有限公司 | Gypsum-based indoor terrace self-leveling concrete prepared from phosphogypsum active powder and preparation method and application thereof |
| CN115286339A (en) * | 2022-07-19 | 2022-11-04 | 贵州磷化绿色环保产业有限公司 | Self-leveling, self-compacting and high-strength gypsum-based indoor terrace self-leveling concrete and preparation method and application thereof |
| CN115872717A (en) * | 2022-12-30 | 2023-03-31 | 中冶武汉冶金建筑研究院有限公司 | Low-cost water-resistant anti-freezing phosphogypsum-based self-leveling thermal insulation mortar and preparation method thereof |
| CN115872717B (en) * | 2022-12-30 | 2024-04-09 | 中冶武汉冶金建筑研究院有限公司 | Low-cost water-resistant and freezing-resistant phosphogypsum-based self-leveling thermal insulation mortar and preparation method thereof |
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Application publication date: 20201027 |