CN114835460A - Anti-cracking gypsum-based self-leveling mortar and preparation method thereof - Google Patents
Anti-cracking gypsum-based self-leveling mortar and preparation method thereof Download PDFInfo
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- CN114835460A CN114835460A CN202210257371.2A CN202210257371A CN114835460A CN 114835460 A CN114835460 A CN 114835460A CN 202210257371 A CN202210257371 A CN 202210257371A CN 114835460 A CN114835460 A CN 114835460A
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- leveling mortar
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- 239000010440 gypsum Substances 0.000 title claims abstract description 94
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 94
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 70
- 238000005336 cracking Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims description 19
- 239000004743 Polypropylene Substances 0.000 claims description 15
- 239000010881 fly ash Substances 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 11
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 239000002956 ash Substances 0.000 claims description 5
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 5
- 229920001038 ethylene copolymer Polymers 0.000 claims description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 5
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 5
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 5
- 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 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 102000004169 proteins and genes Human genes 0.000 claims description 5
- 108090000623 proteins and genes Proteins 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 13
- 239000011159 matrix material Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 239000006227 byproduct Substances 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an anti-cracking gypsum-based self-leveling mortar, which comprises building gypsum, water, cement, fiber, a water-retaining agent, a retarder, a water reducing agent, a defoaming agent and rubber powder. The invention also discloses a preparation method of the anti-crack gypsum-based self-leveling mortar. The anti-cracking gypsum-based self-leveling mortar provided by the invention improves the continuity with a matrix by utilizing the three-dimensional disorientation distribution of fibers in a cementing material on the basis of enhancing the mechanical strength of the gypsum-based self-leveling mortar by cement; mechanical occluding force, interface bonding force and gripping force between the fibers and the matrix resist tensile stress generated inside, so that crack propagation and matrix cracking are inhibited; meanwhile, a chemical admixture with good compatibility is added for modification treatment, so that the physical and mechanical properties of the cementitious material are effectively improved, and the gypsum-based self-leveling mortar has high crack resistance and low shrinkage rate on the premise of excellent construction performance.
Description
Technical Field
The invention belongs to the technical field of inorganic non-metallic materials and building materials, and particularly relates to anti-cracking gypsum-based self-leveling mortar and a preparation method thereof.
Background
At present, the whole discharge amount of industrial by-product gypsum in China is large, and the utilization rate is low by only 40%. The industrial byproduct gypsum occupies a large amount of land resources and causes ecological and environmental damages after being stockpiled for a long time, and the resource utilization of the industrial byproduct gypsum is the requirement of strategic development in China.
The self-leveling mortar is a ground self-leveling material which is compounded by taking an inorganic cementing material or an organic material as a base material, an aggregate and an additive, has good fluidity, can accurately level the ground in a large area in a short time, and is beneficial to the improvement of construction speed and the application of engineering materials. The self-leveling mortar comprises inorganic self-leveling mortar and organic self-leveling mortar, and the inorganic self-leveling mortar comprises cement self-leveling mortar and gypsum self-leveling mortar. However, the current engineering application of gypsum-based self-leveling mortar is not optimistic, and has the problems of low strength and serious cracking. The gypsum-based self-leveling mortar is prepared by mixing building gypsum as a main component and additives such as a water reducing agent and a retarder. However, the strength of the building gypsum is low after the building gypsum is hydrated and hardened, and in order to meet the construction requirement of high fluidity, the strength is further reduced due to extremely high water consumption; in addition, in order to meet the construction operation performance, a large amount of retarder is needed to meet the requirement of initial setting for 90 minutes or more, and further, the mechanical strength of the matrix is obviously and negatively influenced. The compound doping of the hydraulic cementing material is a main means for solving the problem of low mechanical strength of the gypsum-based self-leveling mortar at present. Commonly used reinforcing materials are portland cement, aluminate cement, sulphoaluminate cement, and the like, wherein the portland cement has low cost and is most widely applied. However, the gypsum self-leveling mortar matrix is easy to crack due to drying shrinkage, hydration shrinkage, temperature shrinkage, self-shrinkage and the like of the cement-based cementing material, so that the cement-based cementing material is the cement-based self-leveling mortar and the cement-enhanced gypsum-based self-leveling mortar at present, the largest quality problem is caused, and the engineering quality problem is frequent, so that the popularization and the application of the gypsum-based self-leveling mortar are influenced, and the comprehensive utilization of industrial gypsum by-products is further hindered.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention mainly aims to provide the anti-cracking gypsum-based self-leveling mortar, and aims to solve the problem that the existing gypsum-based self-leveling mortar is poor in strength and anti-cracking performance and serious in cracking in the use process. Meanwhile, the invention also provides a preparation method of the anti-cracking gypsum-based self-leveling mortar.
The purpose of the invention is realized by the following technical scheme:
in a first aspect: an anti-cracking gypsum-based self-leveling mortar comprises building gypsum, water, cement, fiber, a water-retaining agent, a retarder, a water reducing agent, a defoaming agent and rubber powder.
Preferably, the building gypsum plaster comprises, by weight, 100 parts of building gypsum, 30-45 parts of water, 5-15 parts of cement, 0.08-0.15 part of fiber, 0.05-0.1 part of water-retaining agent, 0.1-0.3 part of retarder, 0.2-0.35 part of water reducing agent, 0.03-0.10 part of defoaming agent and 0.1-0.3 part of rubber powder.
Preferably, the sand comprises 0-20 parts of ore sand by weight, wherein the ore sand comprises large-particle-size ore sand and small-particle-size ore sand, the fineness of the large-particle-size ore sand is 100-140 meshes, the fineness of the small-particle-size ore sand is 30-45 meshes, and the mass ratio of the large-particle-size ore sand to the small-particle-size ore sand is 2: 1.
Preferably, the stone powder comprises 0-20 parts by weight of stone powder, and the particle fineness of the stone powder is 300-400 meshes.
Preferably, the fly ash comprises 3-10 parts by weight of fly ash, and the fly ash is I-grade ash.
Preferably, the building gypsum is desulfurized building gypsum, and the specific surface area is 300-400 m 2 Per kg, the particle size is 40 to 150 μm.
Preferably wherein the fibres are PP polypropylene fibres and have a length of 4-8 mm.
Preferably, the water retention agent hydroxypropyl methyl cellulose ether has the viscosity of 400-600 mpa-s.
Preferably, the retarder is a protein retarder, the reducer is a white powdery polycarboxylic acid water reducer, the water reduction rate is 40%, and the pH value is 6.5-8.5; the defoaming agent is a polyether defoaming agent, and the rubber powder is a vinyl acetate-ethylene copolymer.
According to the formula requirement of the anti-cracking gypsum-based self-leveling mortar, building gypsum, cement, fibers and/or ore sand and/or stone powder and/or fly ash are added into a stirring machine, and then water, a water-retaining agent, a retarder, a water reducing agent, a defoaming agent and rubber powder are uniformly mixed and then added into the stirring machine for uniform mixing.
Compared with the prior art, the invention has at least the following advantages:
1) the anti-cracking gypsum-based self-leveling mortar provided by the invention is used for reducing CO by fully utilizing industrial by-product gypsum to replace cement high-pollution and high-energy-consumption materials 2 The discharge of the mortar promotes the development and application significance of the green low-carbon gypsum-based self-leveling mortar.
2) According to the anti-cracking gypsum-based self-leveling mortar provided by the invention, on the basis of enhancing the mechanical strength of the gypsum-based self-leveling mortar by cement, fibers are distributed in a three-dimensional disorientation manner in a cementing material to form a net structure with a constraint effect, so that the internal part of a hardened body is improved, the crystals and the fibers are mutually lapped and jointly bear load, and the continuity of a matrix is improved; meanwhile, the tensile stress generated inside is resisted through the mechanical occluding force, the interface adhesive force and the gripping force between the fibers and the matrix, so that the crack propagation and the matrix cracking are inhibited; meanwhile, a chemical admixture with good compatibility is added for modification treatment, so that the physical and mechanical properties of the cementitious material are effectively improved, and the gypsum-based self-leveling mortar has high crack resistance and low shrinkage rate on the premise of excellent construction performance.
Detailed Description
The present invention will be further described with reference to the following examples, which are illustrative only and not intended to be limiting, and the scope of the present invention is not limited thereby.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or upper and lower limit of preferred values, it is understood that any range by combining any pair of range upper limits or preferred values with any range lower limits or preferred values is expressly disclosed without regard to whether or not such range is expressly disclosed. Unless otherwise indicated, numerical range values set forth herein are intended to include the endpoints of the range, and all integers and fractions within the range.
All percentages, parts, ratios, etc. herein are by weight unless otherwise indicated.
The materials, methods, and examples herein are illustrative and, unless otherwise specified, are not to be construed as limiting. The raw materials, detection equipment, and the like in the present application are commercially available unless otherwise specified.
Example 1
An anti-crack gypsum-based self-leveling mortar and a preparation method thereof, wherein the anti-crack gypsum-based self-leveling mortar comprises the following raw materials:
comprises 100kg of building gypsum, 30kg of water, 15kg of cement, 0.15kg of fiber, 0.1kg of water-retaining agent, 0.15kg of retarder, 0.35kg of water reducing agent, 0.1kg of defoamer and 0.2kg of rubber powder.
Wherein the building gypsum is desulfurized building gypsum, and the specific surface area is 300m 2 Per kg, the particle size is 60 mu m, wherein the cement is 42.5-grade quick-hardening ordinary portland cement (P.O 42.5R), the fiber is PP polypropylene fiber, the length is 4mm, the fly ash is I-grade ash, the water-retaining agent is hydroxypropyl methyl cellulose ether, the viscosity is 600mpa & s, the retarder is protein retarder, the reducer is white powdery polycarboxylic acid water reducer, the water reduction rate is 40%, and the pH value is 7; wherein the defoaming agent is a polyether defoaming agent, and the rubber powder is a vinyl acetate-ethylene copolymer;
the preparation method of the anti-crack gypsum-based self-leveling mortar comprises the following steps:
adding building gypsum, cement and fiber into a stirrer, and stirring at medium speed for 3 min; and then, uniformly mixing water, a water-retaining agent, a retarder, a water reducing agent and defoaming agent rubber powder, adding into a stirrer, stirring at a medium speed for 4min, and stirring at a high speed for 5 min. Wherein, the medium speed rotational speed is: rotation is 140 +/-5 r/min, and revolution is 62 +/-5 r/min; high speed: rotation is 285 +/-10 r/min, and revolution is 125 +/-l 0 r/min.
Example 2
An anti-crack gypsum-based self-leveling mortar and a preparation method thereof, wherein the anti-crack gypsum-based self-leveling mortar comprises the following raw materials:
comprises 100kg of building gypsum, 36kg of water, 10kg of cement, 0.1kg of fiber, 0.07kg of water-retaining agent, 0.2kg of retarder, 0.2kg of water reducing agent, 0.05kg of defoaming agent and 0.3kg of rubber powder.
Wherein the building gypsum is desulfurized building gypsum, and the specific surface area is 350m 2 Per kg, the particle size is 120 mu m, wherein the cement is 42.5-grade quick-hardening ordinary portland cement (P.O 42.5R), the fiber is PP polypropylene fiber, the length is 6mm, the fly ash is I-grade ash, the water-retaining agent is hydroxypropyl methyl cellulose ether, the viscosity is 500 mpa.s, the retarder is protein retarder, the reducer is white powdery polycarboxylic acid water reducer, the water reduction rate is 40%, and the pH value is 8.5; wherein the defoaming agent is a polyether defoaming agent, and the rubber powder is a vinyl acetate-ethylene copolymer;
the preparation method of the anti-crack gypsum-based self-leveling mortar comprises the following steps:
adding building gypsum, cement and fiber into a stirrer, and stirring at medium speed for 3 min; and then, uniformly mixing water, a water-retaining agent, a retarder, a water reducing agent and defoaming agent rubber powder, adding into a stirrer, stirring at a medium speed for 4min, and stirring at a high speed for 5 min. Wherein, the medium speed rotational speed is: rotation is 140 +/-5 r/min, and revolution is 62 +/-5 r/min; high speed: rotation is 285 +/-10 r/min, and revolution is 125 +/-l 0 r/min.
Example 3
An anti-crack gypsum-based self-leveling mortar and a preparation method thereof, wherein the anti-crack gypsum-based self-leveling mortar comprises the following raw materials:
comprises 100kg of building gypsum, 42kg of water, 5kg of cement, 0.08kg of fiber, 0.05kg of water-retaining agent, 0.1kg of retarder, 0.25kg of water reducing agent, 0.05kg of defoaming agent and 0.1kg of rubber powder.
Wherein the building gypsum is desulfurized building gypsum, and the specific surface area is 400m 2 Per kg, particle size 150 μm, wherein the cement is 42.5 grade rapid hardening type common silicic acidSalt cement (P.O 42.5R), wherein the fiber is PP polypropylene fiber, the length is 8mm, the fly ash is I-grade ash, the water-retaining agent is hydroxypropyl methyl cellulose ether, the viscosity is 400 mpa.s, the retarder is a protein retarder, the reducer is a white powdery polycarboxylic acid water reducer, the water reducing rate is 40%, and the pH value is 6.5; wherein the defoaming agent is a polyether defoaming agent, and the rubber powder is a vinyl acetate-ethylene copolymer;
the preparation method of the anti-crack gypsum-based self-leveling mortar comprises the following steps:
adding building gypsum, cement and fiber into a stirrer, and stirring at medium speed for 3 min; and then, uniformly mixing water, a water-retaining agent, a retarder, a water reducing agent and defoaming agent rubber powder, adding into a stirrer, stirring at a medium speed for 4min, and stirring at a high speed for 5 min. Wherein, the medium speed rotational speed is: rotation is 140 +/-5 r/min, and revolution is 62 +/-5 r/min; high speed: rotation is 285 +/-10 r/min, and revolution is 125 +/-l 0 r/min.
And (3) performance testing:
the performance of the gypsum-based self-levelling mortars prepared in the above examples was tested according to JC/T1023-2007 Gypsum-based self-levelling mortars. The test results are reported in Table 1:
table 1 properties of gypsum-based self-leveling mortars prepared in examples 1-3
Example 4
Example 1 was repeated except that 15kg of ore was added, wherein the ore was a mixture of large-particle-size ore having a fineness of 120 mesh and small-particle-size ore having a fineness of 35 mesh mixed at a mass ratio of 2: 1; or 6kg of stone powder with the fineness of 320 meshes is added, or the mixture of the ore sand and the stone powder are added after being compounded according to the mass ratio of 1:1, 2:1, 3:1, 1:2 and 1:3, and the rest are the same; the performance of the gypsum-based self-leveling mortar is detected, and the test results of various performance indexes are shown in table 2:
table 2 properties of gypsum-based self-leveling mortars prepared in example 4
Example 5
On the basis of the embodiment 4, 6kg of fly ash is added, the performance of the prepared gypsum-based self-leveling mortar is detected, and the test results of various performance indexes are shown in the table 3:
table 3 properties of gypsum-based self-leveling mortars prepared in example 5
Comparative example 1
Example 5 was repeated except that no polypropylene fiber was added and the other was the same, and the performance indexes of the gypsum-based self-leveling mortar were measured by the above performance test method, and the results are shown in table 4:
table 4 properties of gypsum-based self-leveling mortar prepared in comparative example 1
Comparative example 2
Example 5 was repeated except that 0.18kg of polypropylene fiber was added, and the other was the same, and the performance indexes of the gypsum-based self-leveling mortar were measured by the above performance test method, and the results are shown in table 5:
table 5 properties of gypsum-based self-leveling mortar prepared in comparative example 2
Comparative example 3
Example 5 was repeated except that 0.05kg of polypropylene fiber was added, and the other was the same, and the performance indexes of the gypsum-based self-leveling mortar were measured by the above performance test method, and the results are shown in table 6:
table 6 properties of gypsum-based self-leveling mortar prepared in comparative example 3
Comparative example 4
Example 5 was repeated except that the added polypropylene fibers had a length of 3mm and the remainder were the same, and the performance indexes of the gypsum-based self-leveling mortar were measured by the above-mentioned performance test method, and the results are shown in table 7:
table 7 properties of gypsum-based self-leveling mortar prepared in comparative example 4
Comparative example 5
Example 5 was repeated except that the added polypropylene fibers had a length of 9mm and the remainder were the same, and the performance indexes of the gypsum-based self-leveling mortar were measured by the above-mentioned performance test method, and the results are shown in table 8:
table 8 properties of gypsum-based self-leveling mortar prepared in comparative example 5
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The anti-cracking gypsum-based self-leveling mortar is characterized by comprising building gypsum, water, cement, fibers, a water-retaining agent, a retarder, a water reducing agent, a defoaming agent and rubber powder.
2. The anti-cracking gypsum-based self-leveling mortar according to claim 1, which comprises 100 parts by weight of building gypsum, 30-45 parts by weight of water, 5-15 parts by weight of cement, 0.08-0.15 part by weight of fiber, 0.05-0.1 part by weight of water-retaining agent, 0.1-0.3 part by weight of retarder, 0.2-0.35 part by weight of water reducing agent, 0.03-0.10 part by weight of defoaming agent and 0.1-0.3 part by weight of rubber powder.
3. The anti-cracking gypsum-based self-leveling mortar according to claim 2, further comprising 0-20 parts by weight of ore sand, wherein the ore sand comprises large-particle-size ore sand and small-particle-size ore sand, the fineness of the large-particle-size ore sand is 100-140 meshes, the fineness of the small-particle-size ore sand is 30-45 meshes, and the mass ratio of the large-particle-size ore sand to the small-particle-size ore sand is 2: 1.
4. The anti-cracking gypsum-based self-leveling mortar according to claim 2 or 3, further comprising 0-20 parts by weight of stone powder, wherein the particle fineness of the stone powder is 300-400 meshes.
5. The anti-cracking gypsum-based self-leveling mortar according to claim 4, further comprising 3 to 10 parts by weight of fly ash, wherein the fly ash is grade I ash.
6. The anti-cracking gypsum-based self-leveling mortar according to claim 1, wherein the building gypsum is desulfurized building gypsum, and the specific surface area of the desulfurized building gypsum is 300-400 m 2 Per kg, the particle size is 40 to 150 μm.
7. The crack resistant gypsum based self-leveling mortar of claim 1, wherein the fibers are PP polypropylene fibers and have a length of 4-8 mm.
8. The crack-resistant gypsum-based self-leveling mortar of claim 1, wherein the water-retaining agent hydroxypropyl methyl cellulose ether has a viscosity of 400-600 mpa-s.
9. The anti-cracking gypsum-based self-leveling mortar according to claim 1, wherein the retarder is a protein retarder, the reducer is a white powdery polycarboxylate water reducer, the water reduction rate is 40%, and the pH value is 6.5-8.5; the defoaming agent is a polyether defoaming agent, and the rubber powder is a vinyl acetate-ethylene copolymer.
10. The preparation method of the anti-cracking gypsum-based self-leveling mortar according to any one of claims 1 to 9, characterized by adding building gypsum, cement, fiber, and/or ore, and/or stone powder, and/or fly ash into a stirrer according to the formula requirements of the anti-cracking gypsum-based self-leveling mortar, and then adding water, a water-retaining agent, a retarder, a water reducing agent, a defoaming agent and rubber powder into the stirrer after uniformly mixing, and uniformly mixing.
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| CN202210257371.2A CN114835460A (en) | 2022-03-16 | 2022-03-16 | Anti-cracking gypsum-based self-leveling mortar and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353346A (en) * | 2022-08-16 | 2022-11-18 | 一夫科技股份有限公司 | Self-leveling anti-crack mortar and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452826A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | Low-carbon self-leveling ground leveling gypsum formula |
| CN108516785A (en) * | 2018-07-03 | 2018-09-11 | 义乌市恒起进出口有限公司 | A kind of high-early-strength does not crack surfacing self-leveling floor mortar and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452826A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | Low-carbon self-leveling ground leveling gypsum formula |
| CN108516785A (en) * | 2018-07-03 | 2018-09-11 | 义乌市恒起进出口有限公司 | A kind of high-early-strength does not crack surfacing self-leveling floor mortar and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353346A (en) * | 2022-08-16 | 2022-11-18 | 一夫科技股份有限公司 | Self-leveling anti-crack mortar and preparation method thereof |
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