CN114940612A - Special repair material for gypsum self-leveling ground and preparation method thereof - Google Patents
Special repair material for gypsum self-leveling ground and preparation method thereof Download PDFInfo
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- CN114940612A CN114940612A CN202210590964.0A CN202210590964A CN114940612A CN 114940612 A CN114940612 A CN 114940612A CN 202210590964 A CN202210590964 A CN 202210590964A CN 114940612 A CN114940612 A CN 114940612A
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- 239000010440 gypsum Substances 0.000 title claims abstract description 98
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 98
- 239000000463 material Substances 0.000 title claims abstract description 70
- 230000008439 repair process Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title description 9
- 239000000843 powder Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229920001971 elastomer Polymers 0.000 claims abstract description 14
- 239000002562 thickening agent Substances 0.000 claims abstract description 14
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 claims abstract description 6
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 14
- 239000011398 Portland cement Substances 0.000 claims description 10
- 239000004816 latex Substances 0.000 claims description 10
- 229920000126 latex Polymers 0.000 claims description 10
- 239000011083 cement mortar Substances 0.000 claims description 9
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 9
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 9
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 9
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 9
- 102000004169 proteins and genes Human genes 0.000 claims description 8
- 108090000623 proteins and genes Proteins 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000011812 mixed powder Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 229960000892 attapulgite Drugs 0.000 claims description 6
- 229910052625 palygorskite Inorganic materials 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 4
- 235000011151 potassium sulphates Nutrition 0.000 claims description 4
- 229920001897 terpolymer Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- GLVVKKSPKXTQRB-UHFFFAOYSA-N ethenyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC=C GLVVKKSPKXTQRB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- 235000010981 methylcellulose Nutrition 0.000 claims description 2
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 2
- GNHOJBNSNUXZQA-UHFFFAOYSA-J potassium aluminium sulfate dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GNHOJBNSNUXZQA-UHFFFAOYSA-J 0.000 claims description 2
- 229920001567 vinyl ester resin Polymers 0.000 claims description 2
- 238000001035 drying Methods 0.000 abstract description 12
- 241000276489 Merlangius merlangus Species 0.000 abstract description 11
- 239000004576 sand Substances 0.000 abstract description 7
- 238000010276 construction Methods 0.000 description 18
- 239000004570 mortar (masonry) Substances 0.000 description 16
- 238000005336 cracking Methods 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 206010016807 Fluid retention Diseases 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- ONQDVAFWWYYXHM-UHFFFAOYSA-M potassium lauryl sulfate Chemical compound [K+].CCCCCCCCCCCCOS([O-])(=O)=O ONQDVAFWWYYXHM-UHFFFAOYSA-M 0.000 description 1
- 229940116985 potassium lauryl sulfate Drugs 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- 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
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (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 a special repair material for a gypsum self-leveling floor, which does not contain a sand mold and consists of the following components in parts by weight: 55-65 parts of alpha-type high-strength gypsum, 30-40 parts of heavy calcium powder, 5-10 parts of a stabilizer, 2-5 parts of cement, 0.04-0.05 part of a water retention thickener, 0.2-0.3 part of a water reducing agent, 0.5-1 part of rubber powder, 0.05-0.1 part of a retarder, 1-2 parts of an excitation reinforcing agent and 0.05-0.1 part of a defoaming agent, wherein the total weight parts of the components are 100 parts. The alpha-type high-strength gypsum is desulfurized alpha-type high-strength gypsum powder or natural alpha-type high-strength gypsum powder, the breaking strength is more than or equal to 3.5MPa after 2 hours, and the drying compressive strength is more than or equal to 25.0 MPa; the coarse whiting powder is coarse whiting, the performance index of the coarse whiting powder meets the requirement of I-type products in HGT3249-2001 industrial coarse whiting calcium carbonate, and the fineness of the coarse whiting powder is 200 meshes.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a special repairing material for a gypsum self-leveling floor and a preparation method thereof.
Background
As a novel ground leveling material, the gypsum self-leveling mortar has the characteristics of good volume stability, difficult hollowing and cracking and high leveling precision. In addition, when gypsum self-leveling construction is adopted, the ground leveling layer structure can be optimized, and compared with the traditional method of self-leveling of fine aggregate concrete/cement mortar and surface cement, the method can realize fine leveling of a thick layer at one time and reduce construction procedures. In view of this, in recent years, gypsum self-leveling mortar is being recognized by real estate enterprises and refinish companies, and the market volume is increasing year by year.
As a novel thick-layer ground backfill leveling material, although gypsum self-leveling mortar has the advantages of no hollowing, no cracking, good dimensional stability and the like, the gypsum self-leveling mortar often has the engineering quality problems of cracking, insufficient elevation, unqualified flatness, surface sanding, low strength and the like on the finished ground caused by the fact that the site construction environment is not qualified, the process mode is not standard, the quality control of the construction process is not available and the like in the construction process. In order to meet the acceptance requirements of engineering quality, the constructed ground needs to be repaired, and for the ground with insufficient elevation and surface evenness not meeting the acceptance requirements, the common repairing method is to pour gypsum-based self-leveling with the thickness not more than 5mm on the finished ground again. The existing common gypsum self-leveling mortar is suitable for thick-layer construction, and generally, the single construction thickness of the mortar is not less than 10 mm; if the common gypsum self-leveling material is used as a repairing material, the requirement of thin layer repairing cannot be met, and quality problems such as sand generation, pulverization and the like are easy to occur in the later period.
Chinese patent CN111393125A discloses a gypsum-based self-leveling mortar and a repairing method thereof, wherein the gypsum-based self-leveling mortar is prepared from various additives such as building gypsum, quartz sand, stone powder and the like, and the repairing method thereof for the gypsum-based self-leveling cracking problem is provided. At present, the repair mortar has a single function and a limited repair range, is only limited to repair the cracking problem, and can not adopt a thin layer pouring mode to repair and construct the problems of unqualified flatness, insufficient elevation and the like due to the addition of a certain proportion of quartz sand.
Therefore, there is a need to develop a special repair material for repairing the quality problems common to gypsum-based self-leveling floors.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a special repairing material for a gypsum self-leveling floor, which has the main components matched with those of the gypsum self-leveling floor, realizes the performance approaching to that of a material to be repaired, good compatibility and stable system, and can effectively avoid the quality problem caused by mutual reaction between different cementing materials.
In order to realize the purpose, the invention provides a special repair material for a gypsum self-leveling floor, which comprises the following components in parts by weight: 55-65 parts of alpha-type high-strength gypsum, 30-40 parts of heavy calcium powder, 5-10 parts of a stabilizer, 2-5 parts of cement, 0.04-0.05 part of a water-retaining thickener, 0.2-0.3 part of a water reducer, 0.5-1 part of rubber powder, 0.05-0.1 part of a retarder, 1-2 parts of an excitation enhancer and 0.05-0.1 part of an antifoaming agent, wherein the total weight of all the components is 100 parts.
Further, the alpha-type high-strength gypsum is desulfurized alpha-type high-strength gypsum powder or natural alpha-type high-strength gypsum powder; the strength grade of the alpha-type high-strength gypsum meets the requirement of the alpha 25 grade in JC/T2038-2010 alpha-type high-strength gypsum, wherein the breaking strength is more than or equal to 3.5MPa after 2h, and the drying compressive strength is more than or equal to 25.0 MPa.
Furthermore, the coarse whiting powder is coarse whiting, the performance index of the coarse whiting powder meets the requirement of I-type products in HGT3249-2001 'industrial coarse whiting calcium carbonate', and the fineness of the coarse whiting powder is 100-400 meshes.
Furthermore, the stabilizer is attapulgite with the fineness of 100-350 meshes.
Further, the cement is 42.5-62.5 grade portland cement or ordinary portland cement.
Further, the water-retaining thickener comprises one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
Further, the water-retaining thickener is hydroxypropyl methylcellulose with the viscosity of 400-20000 mPa.s.
Further, the rubber powder is re-dispersible latex powder; the retarder is a high-efficiency protein retarder; the excitation reinforcing agent is one or two of potassium sulfate, aluminum potassium sulfate dodecahydrate and anhydrous sodium sulphate; the defoaming agent is a polyether compound powdery defoaming agent; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent;
the water retention thickener, the water reducing agent, the retarder, the excitation reinforcing agent, the defoaming agent and the rubber powder are all powder bodies.
Further, the redispersible latex powder comprises one or more of copolymer rubber powder of vinyl acetate and ethylene, terpolymer rubber powder of ethylene, vinyl chloride and vinyl laurate, and terpolymer rubber powder of vinyl acetate, ethylene and higher fatty acid vinyl ester.
The invention also provides a preparation method of the special repair material for the gypsum self-leveling floor, which comprises the following steps of uniformly mixing all the components in a mixer for later use, and mixing uniformly the powder and water according to the mass ratio of 1: (0.25-0.35) for 120 seconds in a cement mortar mixer, and then preparing the special repair material for the gypsum self-leveling floor.
The special repair material for the gypsum self-leveling floor is tested according to the standard of JC/T1023-2021 gypsum-based self-leveling mortar, and the result shows that: the initial fluidity is 155mm, the fluidity is 155mm in 30min, the 24 rupture strength is 3.5-4.5MPa, the 24h compressive strength is 8.5-9.5MPa, the 28d oven dry rupture strength is 9.5-11MPa, the 28d oven dry rupture strength is 25.0-31.0MPa, the 28d oven dry tensile bonding strength is 1.5-2.0MPa, and the impact resistance is qualified, namely, the crack is not generated and the bottom plate is not separated. The performance indexes of the repairing material of the invention are obviously superior to the requirements of the standards, and the repairing material has higher bonding strength, compressive strength and surface hardness.
Compared with the prior art, the special repair material for the gypsum self-leveling ground takes the high-strength gypsum as a main cementing material, the heavy calcium powder as a fine aggregate, and various additives such as a water reducing agent, a stabilizing agent, a water retention thickening agent, an exciting agent and the like are added to further improve the product performance: the product of the invention has the characteristics of good fluidity, high strength, strong cohesive force and large surface hardness. The special repair material for the gypsum self-leveling ground can effectively repair common engineering quality problems of cracking, insufficient elevation, poor flatness, low surface strength and the like, and can perfectly solve the pain point which is difficult to repair common quality problems of gypsum self-leveling. Its advantages are as follows:
1) the gypsum-based cementing material is adopted, the gypsum-based cementing material has the same components as a gypsum self-leveling cementing material, the performance of the repairing material and the material to be repaired is close, the compatibility is good, the system is stable, and the quality problem caused by mutual reaction of different cementing materials can be effectively avoided.
2) The repairing material of the invention takes the alpha high-strength gypsum powder as the main cementing material, is modified by adding the stabilizing agent and the excitant together, has the compressive strength of 25.0-31.0MPa, the tensile bonding strength of 1.5-2.0MPa, the compressive strength is equivalent to the self-leveling strength of gypsum, has higher tensile bonding strength, can better ensure the good bonding of the repairing material and the gypsum base by self-leveling, simultaneously, the heavy calcium powder is taken as the fine aggregate, the stabilizing agent better improves the performance of thin-layer construction, the construction thickness can reach 1-2mm at the thinnest, and can meet the thin-layer repairing requirement of common quality problems of gypsum self-leveling.
3) The dry powder repair material can be used after being added with water and stirred uniformly on site, has the same construction process as gypsum self-leveling, and is efficient and convenient to construct.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
A preparation method of a special repair material for a gypsum self-leveling floor comprises the following steps:
weighing the following raw materials in parts by weight: 60 parts of alpha-type high-strength gypsum, 30 parts of 200-mesh heavy calcium powder, 7 parts of 200-mesh attapulgite, 2 parts of ordinary portland cement PO42.5, 0.04 part of hydroxypropyl methyl cellulose (with the viscosity of 20000mPa.s), 0.25 part of polycarboxylic acid water reducing agent, 0.5 part of redispersible latex powder, 0.08 part of protein retarder, 1.5 parts of potassium sulfate and 0.07 part of polyether defoamer, and are uniformly mixed in a mixer for later use.
Mixing the uniformly mixed powder with water according to the weight ratio of 1: stirring the mixture in a cement mortar stirrer for 120 seconds according to the proportion of 0.32 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to JC/T1023-Able 2021 gypsum-based self-leveling mortar standard, the initial fluidity is 145mm, the fluidity is 145mm in 30min, the 24h flexural strength is 4.1MPa, the 24h compressive strength is 9.1MPa, the 28d absolute dry flexural strength is 10.3MPa, the 28d absolute dry compressive strength is 27.7MPa, the 28d drying tensile bonding strength is 1.8MPa, the size change rate is-0.03%, the gypsum-based self-leveling surface is subjected to 2mm thin-layer construction, and after hardening and drying, the phenomena of hollowing, cracking, powder falling and the like do not occur.
Example 2
A preparation method of a special repair material for a gypsum self-leveling floor comprises the following steps:
1. weighing the following raw materials by weight: 55 parts of alpha-type high-strength gypsum, 37 parts of 100-mesh heavy calcium powder, 5 parts of 200-mesh attapulgite, 2 parts of ordinary portland cement PO42.5, 0.04 part of hydroxypropyl methyl cellulose ether (viscosity 20000mPa.s), 0.2 part of polycarboxylic acid water reducing agent, 0.5 part of redispersible latex powder, 0.06 part of protein retarder, 1 part of potassium lauryl sulfate and 0.07 part of polyether defoamer, and the components are uniformly mixed in a mixer for later use.
2. Mixing the uniformly mixed powder with water according to the ratio of 1: stirring the mixture in a cement mortar stirrer for 120 seconds according to the proportion of 0.29 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to JC/T1023-2021 gypsum-based self-leveling mortar standard, the initial fluidity is 148mm, the fluidity is 149mm in 30min, the 24 breaking strength is 3.6MPa, the 24h compressive strength is 8.7MPa, the 28d absolute dry breaking strength is 9.8MPa, the 28d absolute dry compressive strength is 25.5MPa, the 28d drying tensile bonding strength is 1.6MPa, the size change rate is-0.02%, the gypsum-based self-leveling surface is subjected to 4mm thin-layer construction, and the phenomena of hollowing, cracking, powder falling and the like are avoided after hardening and drying.
Example 3
A preparation method of a special repair material for a gypsum self-leveling floor comprises the following steps:
1. weighing the following raw materials by weight: 62 parts of alpha-type high-strength gypsum, 30 parts of 200-mesh heavy calcium powder, 5 parts of 100-mesh attapulgite, 2 parts of ordinary portland cement PO42.5, 0.05 part of hydroxyethyl cellulose (with the viscosity of 400mPa.s), 0.3 part of polycarboxylic acid water reducing agent, 0.5 part of redispersible latex powder, 0.1 part of protein retarder, 2 parts of anhydrous sodium sulphate and 0.07 part of polyether defoamer, and the components are uniformly mixed in a mixer for later use.
2. Mixing the uniformly mixed powder with water according to the weight ratio of 1: stirring the mixture in a cement mortar stirrer for 120 seconds according to the proportion of 0.34 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to JC/T1023-Able 2021 gypsum-based self-leveling mortar standard, the initial fluidity is 152mm, the fluidity at 30min is 150mm, the 24 breaking strength is 4.4MPa, the 24h compressive strength is 9.4MPa, the 28d absolute dry breaking strength is 10.6MPa, the 28d absolute dry compressive strength is 30.1MPa, the 28d drying tensile bonding strength is 1.8MPa, the size change rate is-0.02 percent, the gypsum-based self-leveling surface is subjected to 2mm thin-layer construction, and the phenomena of hollowing, cracking, powder falling and the like are avoided after hardening and drying.
Comparative example 1
1. Weighing the following raw materials by weight: 55 parts of alpha-type high-strength gypsum, 40 parts of 30-100-mesh quartz sand, 5 parts of ordinary portland cement, 0.15 part of protein retarder, 0.04 part of hydroxypropyl methyl cellulose ether (viscosity 20000mPa.s), 0.5 part of redispersible latex powder, 0.5 part of defoaming agent and 0.2 part of water reducing agent. Mixing in a mixer for use.
2. Mixing the uniformly mixed powder with water according to the weight ratio of 1: stirring the mixture in a cement mortar stirrer for 120 seconds according to the proportion of 0.25 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to the JC/T1023 and 2021 Gypsum-based self-leveling mortar standard, the initial fluidity is 140mm, the fluidity is 141mm in 30min, the 24 breaking strength is 4.4MPa, the 24h compressive strength is 9.4MPa, the 28d absolute dry breaking strength is 10.6MPa, the 28d absolute dry compressive strength is 30.1MPa, the 28d drying tensile bonding strength is 1.3MPa, the shrinkage rate is-0.02 percent, and the shrinkage rate is a negative value. The gypsum-based self-leveling surface is subjected to 2mm thin-layer repairing construction, so that the gypsum-based self-leveling surface is quick in water loss, cannot be normally hardened, and has the phenomena of cracking, insufficient surface strength, powder falling and the like.
Reason analysis: because 30-100 meshes of quartz sand is used as aggregate, the sand contains 30 meshes of coarse particles, the particle size is larger, and during thin-layer construction, the surface of the sand is coarse sand particles, so that the flatness is influenced; meanwhile, the sand has high volume weight, part of fine sand is easy to settle, bleeding and layering of slurry are caused, and cracking and insufficient strength are caused in the drying and shrinking process.
Comparative example 2
A preparation method of a special repair material for a gypsum self-leveling floor comprises the following steps:
1. weighing the following raw materials by weight: 50 parts of alpha-type high-strength gypsum, 45 parts of 200-mesh heavy calcium powder, 5 parts of ordinary portland cement PO42.5, 0.05 part of hydroxypropyl methyl cellulose ether (with the viscosity of 400mPa.s), 0.2 part of polycarboxylic acid water reducing agent, 0.06 part of protein retarder, 0.07 part of defoaming agent and 0.5 part of redispersible latex powder are uniformly mixed in a mixer for later use.
2. Mixing the uniformly mixed powder with water according to the weight ratio of 1: stirring the mixture for 120 seconds in a cement mortar stirrer according to the proportion of 0.28 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to JC/T1023-doped 2021 gypsum-based self-leveling mortar standard, the initial fluidity is 140mm, the fluidity at 30min is 141mm, the 24 flexural strength is 3.1MPa, the 24h compressive strength is 7.2MPa, the 28d absolute dry flexural strength is 8.1MPa, the 28d absolute dry compressive strength is 22.0MPa, the 28d drying tensile bonding strength is 1.1MPa, the size change rate is-0.03%, the gypsum-based self-leveling surface is subjected to 2mm thin-layer repairing construction, the phenomena of rapid water loss, abnormal hardening, powder falling due to insufficient surface strength and the like occur.
Reason analysis:
in the comparative case, no stabilizer is added, and in the process of repairing the thin layer, the water retention thickening agent has limited effect and cannot meet the requirement of the water retention rate of the product, so that the slurry is dehydrated quickly, the gypsum cementing material and water do not react sufficiently and cannot generate normal strength; therefore, the quality problem of surface powder removal can occur in the process of repairing the 2mm thin layer. By adding the attapulgite stabilizing agent and the exciting agent, the water retention of the material can be effectively improved and the hardness of the surface of the material can be increased.
Comparative example 3
A preparation method of a special repair material for a gypsum self-leveling floor comprises the following steps:
1. weighing the following raw materials by weight: 50 parts of alpha-type high-strength gypsum, 45 parts of 200-mesh heavy calcium powder, 5 parts of ordinary portland cement PO42.5, 0.4 part of hydroxypropyl methyl cellulose ether (viscosity 20000mPa.s) agent, 0.2 part of polycarboxylic acid water reducing agent, 0.06 part of protein retarder, 0.07 part of defoaming agent, 0.5 part of redispersible latex powder and 1 part of potassium sulfate are uniformly mixed in a mixer for later use.
2. Mixing the uniformly mixed powder with water according to the weight ratio of 1: stirring the mixture in a cement mortar stirrer for 120 seconds according to the proportion of 0.42 to prepare the special gypsum self-leveling floor repairing material.
The performance index of the prepared repairing material is tested according to JC/T1023-doped 2021 gypsum-based self-leveling mortar standard, the initial fluidity is 143mm, the fluidity is 140mm in 30min, the 24 flexural strength is 2.1MPa, the 24h compressive strength is 6.9MPa, the 28d absolute dry flexural strength is 7.1MPa, the 28d absolute dry compressive strength is 19.5MPa, the 28d drying tensile bonding strength is 1.2MPa, the size change rate is-0.03%, and the gypsum-based self-leveling surface is subjected to 1mm thin-layer repairing construction, so that the repairing material has the phenomena of high water loss, normal hardening failure, cracking, surface strength deficiency, powder falling and the like.
Reason analysis: for the gypsum self-leveling floor thin layer repairing material, the water retention performance is a key index, although the water retention thickening agent is increased in the comparison case to improve the thickening property of the water retention, the water consumption of the material is increased while the water retention thickening agent is increased by combining the construction leveling property of the material, and the strength performance index of the material is finally unqualified as can be known from the comparison case. Therefore, the performance of the material can be improved by matching the stabilizer with the water-retaining thickener.
In conclusion, the universal alpha high-strength gypsum is preferably selected as the cementing material, the coarse whiting powder is the fine filler, the raw materials of the stabilizer, the rubber powder, the water reducer and the activator are used, the proportion of the components is accurately controlled, the special repairing material which meets the common engineering quality problems of cracking, insufficient elevation, poor flatness, low surface strength and the like of the gypsum self-leveling ground can be prepared, and the pain point of difficult repairing of the common quality problems of gypsum self-leveling can be perfectly solved.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated.
Claims (10)
1. The special repair material for the gypsum self-leveling floor is characterized by comprising the following components in parts by weight: 55-65 parts of alpha-type high-strength gypsum, 30-40 parts of heavy calcium powder, 5-10 parts of a stabilizer, 2-5 parts of cement, 0.04-0.05 part of a water retention thickener, 0.2-0.3 part of a water reducing agent, 0.5-1 part of rubber powder, 0.05-0.1 part of a retarder, 1-2 parts of an excitation reinforcing agent, 0.05-0.1 part of a defoaming agent and 25-35 parts of water; the total weight portion is 100 portions.
2. The special repair material for a gypsum self-leveling ground as claimed in claim 1, wherein the α -type high-strength gypsum is desulfurized α -type high-strength gypsum powder or natural α -type high-strength gypsum powder;
the strength grade of the alpha-type high-strength gypsum meets the requirement of the alpha 25 grade in JC/T2038-2010 alpha-type high-strength gypsum.
3. The special repair material for gypsum self-leveling floor as claimed in claim 1, wherein the heavy calcium carbonate powder is heavy calcium carbonate, the performance index of the heavy calcium carbonate powder meets the requirement of class I products in HGT3249-2001 industrial heavy calcium carbonate, and the fineness of the heavy calcium carbonate powder is 100-400 meshes.
4. The gypsum self-leveling floor special repair material as claimed in claim 1, wherein the stabilizer is attapulgite with a fineness of 100-350 mesh.
5. The repair material for gypsum self-leveling floor according to claim 1, wherein the cement is 42.5 to 62.5 grade portland cement or ordinary portland cement.
6. The repair material for gypsum self-leveling floor as claimed in claim 1, wherein the water-retaining thickener comprises one or more of methylcellulose, carboxymethylcellulose, hydroxyethylcellulose and hydroxypropylmethylcellulose.
7. The repair material for self-leveling floor of gypsum according to claim 6, wherein the water-retaining thickener is hydroxypropylmethylcellulose having a viscosity of 400-.
8. The special repair material for gypsum self-leveling floor according to claim 1, wherein the rubber powder is a redispersible latex powder; the retarder is a high-efficiency protein retarder; the excitation reinforcing agent is one or two of potassium sulfate, aluminum potassium sulfate dodecahydrate and anhydrous sodium sulphate; the defoaming agent is a polyether compound powdery defoaming agent; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent;
the water retention thickener, the water reducing agent, the retarder, the excitation reinforcing agent, the defoaming agent and the rubber powder are all powder.
9. The special repair material for gypsum self-leveling floor as claimed in claim 8, wherein the redispersible latex powder comprises one or more of copolymer rubber powder of vinyl acetate and ethylene, terpolymer rubber powder of ethylene, vinyl chloride and vinyl laurate, and terpolymer rubber powder of vinyl acetate, ethylene and vinyl ester of higher fatty acid.
10. The method for preparing the repair material for gypsum self-leveling floor according to any one of claims 1 to 9, wherein all the components are uniformly mixed in a mixer for standby, and the uniformly mixed powder and water are mixed in a mass ratio of 1: (0.25-0.35) stirring for 120 seconds in a cement mortar stirrer to prepare the special repair material for the gypsum self-leveling floor.
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| JP2016216290A (en) * | 2015-05-19 | 2016-12-22 | 宇部興産株式会社 | Self-levelling material, self-levelling material slurry and cured body |
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| CN113603442A (en) * | 2021-09-08 | 2021-11-05 | 湖南愿景住宅工业科技有限公司 | Low-cost gypsum-based self-leveling material |
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| CN113603442A (en) * | 2021-09-08 | 2021-11-05 | 湖南愿景住宅工业科技有限公司 | Low-cost gypsum-based self-leveling material |
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Application publication date: 20220826 |