CN115353362B - Method for increasing effect of water reducer in gypsum-based self-leveling material - Google Patents
Method for increasing effect of water reducer in gypsum-based self-leveling material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 146
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 121
- 239000010440 gypsum Substances 0.000 title claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 64
- 230000001965 increasing effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000011398 Portland cement Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000011268 mixed slurry Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 37
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 25
- 239000001913 cellulose Substances 0.000 claims description 14
- 229920002678 cellulose Polymers 0.000 claims description 14
- 239000013530 defoamer Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 230000001603 reducing effect Effects 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- 239000002426 superphosphate Substances 0.000 claims description 2
- 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 1
- 239000000292 calcium oxide Substances 0.000 abstract description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 23
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 17
- 239000000920 calcium hydroxide Substances 0.000 abstract description 17
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 17
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 12
- 230000000740 bleeding effect Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 15
- 239000003469 silicate cement Substances 0.000 description 10
- 229910052925 anhydrite Inorganic materials 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 239000012615 aggregate Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 101001002508 Homo sapiens Immunoglobulin-binding protein 1 Proteins 0.000 description 2
- 101000713575 Homo sapiens Tubulin beta-3 chain Proteins 0.000 description 2
- 101000713585 Homo sapiens Tubulin beta-4A chain Proteins 0.000 description 2
- 102100021042 Immunoglobulin-binding protein 1 Human genes 0.000 description 2
- 102100036790 Tubulin beta-3 chain Human genes 0.000 description 2
- 102100036788 Tubulin beta-4A chain Human genes 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HSHXDCVZWHOWCS-UHFFFAOYSA-N N'-hexadecylthiophene-2-carbohydrazide Chemical compound CCCCCCCCCCCCCCCCNNC(=O)c1cccs1 HSHXDCVZWHOWCS-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000010640 amide synthesis reaction Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- -1 retarder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation 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
- C04B28/16—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 anhydrite, e.g. Keene's cement
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Abstract
The invention provides a method for increasing the effect of a water reducer in a gypsum-based self-leveling material, which comprises the following steps: adding an alkaline material into the gypsum-based self-leveling material in batches, and mixing and stirring to obtain mixed slurry with pH value of more than or equal to 8.5; the alkaline material comprises any one or a combination of at least two of Portland cement, calcium hydroxide or calcium oxide; the gypsum-based self-leveling material comprises a water reducing agent. According to the method for increasing the effect of the water reducer in the gypsum-based self-leveling material, the alkaline material and the water reducer are combined to act together, so that the fluidity of the gypsum-based self-leveling material is further improved, the addition amount of the water reducer is reduced, the cost of the gypsum-based self-leveling material is reduced, and the bleeding phenomenon of self-leveling gypsum is avoided.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to a gypsum-based self-leveling material, and particularly relates to a method for increasing the effect of a water reducer in the gypsum-based self-leveling material.
Background
The self-leveling gypsum is a dry powder material which is formed by uniformly mixing gypsum, fine aggregate (quartz sand), cement, a water reducing agent, a retarder, an exciting agent and a defoaming agent and is specially used for leveling indoor ground, wherein the gypsum is generally alpha-type and beta-type semi-hydrated gypsum or II-type anhydrite, the self-leveling gypsum is prepared by calcining or steaming primary dihydrate gypsum with the purity of more than 90 percent at 650-750 ℃, and the additive is common chemicals and the dosage is less than 1 percent. In the 60 s of the 20 th century, europe began to adopt gypsum-based terrace materials, while self-leveling gypsum development in China began from the 90 s of the 20 th century, and was limited in technology and cost and progressed slowly.
The gypsum-based self-leveling mortar has good construction operability, is convenient to operate, has low surface flatness error value after forming, does not have hollowing cracking phenomenon, and is suitable for pumping construction. The abundant byproduct gypsum is used as a base material, along with the progress and development of additive technology, the cost of the gypsum self-leveling mortar is continuously reduced, and compared with other materials, the gypsum-based flat mortar indoor floor has the heat preservation property, saves more than 25 percent of energy, and is an environment-friendly material with high added value.
Because gypsum-based self-leveling mortar has irreplaceable resource advantages, in recent years, mass mortar production enterprises are enthusiastically producing gypsum self-leveling mortar by utilizing industrial byproduct gypsum transformation, and the rapid development of the gypsum-based mortar industry is promoted.
In order to provide a self-leveling gypsum with good fluidity, water reducing agents are indispensable additives. The polycarboxylic acid water reducer which is currently used in a large number is a polycarboxylic acid water reducer, has the outstanding advantages of low mixing amount, high dispersibility, good slump retaining property, strong molecular structure adjustability, no formaldehyde in production and the like, and is a development direction and a research hot spot of a high-performance water reducer. Because gypsum is large in standard thickness and poor in fluidity compared with cement, a large amount of polycarboxylic acid water reducer is often required to be added to achieve the initial fluidity, so that the cost is high, the product profit is reduced, and the bleeding of the self-leveling gypsum can be caused by excessive water reducer in the later period.
In summary, for the preparation of self-leveling gypsum, the method can be used for reducing the addition amount of the water reducer, increasing the fluidity, reducing the cost, improving the profit of the self-leveling gypsum and preventing bleeding.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the method for increasing the effect of the water reducer in the gypsum-based self-leveling material, which has the advantages of good construction operability, convenient operation, low surface flatness error value after forming and no empty cracking phenomenon by adopting an alkaline material to adjust the pH value of the gypsum-based self-leveling material to increase the effect of the water reducer.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for increasing the effect of a water reducer in a gypsum-based self-leveling material, which comprises the following steps:
the alkaline material is added to the gypsum-based self-leveling material in batches, and the mixture is mixed and stirred to obtain a mixed slurry with the pH of more than or equal to 8.5, for example, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5 or 14, but the alkaline material is not limited to the listed values, and other non-listed values in the numerical range are applicable.
The alkaline material comprises any one or a combination of at least two of portland cement, calcium hydroxide, or calcium oxide, typically but not limited to a combination of portland cement and calcium hydroxide, a combination of portland cement and calcium oxide, a combination of calcium hydroxide and calcium oxide, or a combination of portland cement, calcium hydroxide, and calcium oxide.
The gypsum-based self-leveling material comprises a water reducing agent.
According to the invention, the effect of the water reducing agent is improved by adjusting the pH value of the gypsum-based self-leveling material by adopting the alkaline material, so that the gypsum-based self-leveling material has the advantages of good construction operability, convenience in operation, low surface layer flatness error value after forming and no hollowing and cracking phenomena.
The alkaline material of the invention is selected to provide alkaline environment for the gypsum-based self-leveling material only, and other interfering ions are not introduced. If sodium hydroxide is selected, the existence of sodium ions can cause the problem of frosting and growing hair in the later period of the self-leveling material.
Most water reducers in the prior art contain functional groups such as carboxyl, sulfonic groups and the like, and the groups are connected with the main chain of the water reducer molecule by adopting chemical means such as amide formation, salt formation, complexation and the like. According to the invention, the pH value of the gypsum-based self-leveling material is changed, so that the water reducer is easier to generate hydrolysis reaction in an alkaline environment, and effective water reducing components are released.
Preferably, the number of batches is 3 to 5, and may be 3, 4 or 5, for example.
According to the invention, the alkaline material is added in batches, so that the alkaline material and the gypsum-based self-leveling material can be fully mixed, and the effect of increasing the water reducer in the gypsum-based self-leveling material by utilizing the alkaline material is further achieved.
Preferably, the gypsum-based self-leveling material further comprises gypsum powder, cement, aggregate, retarder, defoamer and cellulose.
Preferably, the gypsum powder comprises any one of alpha-semi-hydrated gypsum powder, beta-semi-hydrated gypsum powder or II-type anhydrous gypsum powder.
Preferably, the fineness of the gypsum powder is 200 to 500 mesh, for example, 200 mesh, 230 mesh, 260 mesh, 290 mesh, 320 mesh, 350 mesh, 380 mesh, 410 mesh, 440 mesh, 470 mesh or 500 mesh, but not limited to the recited values, and other non-recited values within the numerical range are equally applicable.
Preferably, the gypsum-based self-leveling material comprises any one of an alpha-hemihydrate gypsum-based self-leveling material, a beta-hemihydrate gypsum-based self-leveling material or a type ii anhydrous gypsum-based self-leveling material.
The alpha-semi-hydrated gypsum-based self-leveling material, the beta-semi-hydrated gypsum-based self-leveling material and the II-type anhydrous gypsum-based self-leveling material are air hardening cementing materials, and can be hydrated to form strength. However, other forms of gypsum materials do not have the ability to develop a certain strength.
The alpha-semi-hydrated gypsum based self-leveling material comprises the following raw materials in percentage by mass: the alpha-hemihydrate gypsum powder is 45-55wt%, such as 45wt%, 46wt%, 47wt%, 48wt%, 49wt%, 50wt%, 51wt%, 52wt%, 53wt%, 54wt% or 55wt%, but is not limited to the recited values, and other non-recited values within the numerical range are equally applicable; the aggregate is 40-50wt%, such as 40wt%, 42wt%, 44wt%, 46wt%, 48wt% or 50wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; retarder is 0.1-0.2wt%, for example, may be 0.1wt%, 012wt%, 0.14wt%, 0.16wt%, 0.18wt% or 0.2wt%, but is not limited to the recited values, other non-recited values within the range of values are equally applicable; the defoamer is 0.1 to 0.25wt%, for example, may be 0.1wt%, 0.15wt%, 0.2wt%, or 0.25wt%, but is not limited to the recited values, other non-recited values within the range of values are equally applicable; cellulose is 0.1-0.18wt%, for example, may be 0.1wt%, 012wt%, 0.14wt%, 0.16wt%, or 0.18wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the rubber powder is 0.5-1wt%, such as 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt% or 1wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the water reducing agent is 0.05 to 0.15wt%, for example, 0.05wt%, 0.1wt% or 0.15wt%, but is not limited to the values recited, and other values not recited in the numerical range are equally applicable.
Preferably, the beta-hemihydrate gypsum-based self-leveling material comprises the following raw materials in percentage by mass: 80-90wt% of beta-semi-hydrated gypsum powder, 10-20wt% of aggregate, 0.2-0.5wt% of retarder, 0.15-0.3wt% of defoamer, 0.1-0.2wt% of cellulose, 0.5-1wt% of rubber powder and 0.3-0.5wt% of water reducer.
Preferably, the type II anhydrous gypsum-based self-leveling material comprises the following raw materials in percentage by mass: 80-90wt% of beta-semi-hydrated gypsum powder, 10-20wt% of aggregate, 0.5-1wt% of retarder, 0.1-0.15wt% of defoamer, 0.1-0.2wt% of cellulose, 0.5-1wt% of rubber powder and 0.05-0.15wt% of water reducer.
Preferably, the aggregate comprises sand and/or ground triple superphosphate.
Preferably, the sand comprises machine-made sand.
Preferably, the fineness of the machine-made sand is 70 to 80 mesh, for example, 70 mesh, 71 mesh, 72 mesh, 73 mesh, 74 mesh, 75 mesh, 76 mesh, 77 mesh, 78 mesh, 79 mesh or 80 mesh, but not limited to the recited values, other non-recited values in the numerical range are equally applicable.
Preferably, the fineness of the fine ground calcium carbonate powder is 300-350 mesh, for example, 300 mesh, 305 mesh, 310 mesh, 315 mesh, 320 mesh, 325 mesh, 330 mesh, 335 mesh, 340 mesh, 345 mesh or 350 mesh, but not limited to the recited values, and other non-recited values in the range of values are equally applicable.
Preferably, the calcium carbonate content of the heavy calcium powder is 95-99wt%, such as 95wt%, 95.5wt%, 96wt%, 96.5wt%, 97wt%, 97.5wt%, 98wt%, 98.5wt% or 99wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the retarder comprises a protein retarder.
Preferably, the defoamer comprises a silicone-based defoamer.
Preferably, the cellulose comprises hydroxypropyl methylcellulose ether.
Preferably, the viscosity of the cellulose is 350-450mpa.s, for example 350mpa.s, 360mpa.s, 370mpa.s, 380mpa.s, 390mpa.s, 400mpa.s, 410mpa.s, 420mpa.s, 430mpa.s, 440mpa.s or 450mpa.s, but not limited to the values recited, other non-recited values in the range of values are equally applicable.
Preferably, the water reducing agent comprises a polycarboxylate-type water reducing agent.
The numerical ranges recited herein include not only the above-listed point values, but also any point values between the above-listed numerical ranges that are not listed, and are limited in space and for the sake of brevity, the present invention is not intended to be exhaustive of the specific point values that the stated ranges include.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the method for increasing the effect of the water reducer in the gypsum-based self-leveling material, the alkaline material and the water reducer act together to further improve the fluidity of the gypsum-based self-leveling material, reduce the addition amount of the water reducer, reduce the cost of the gypsum-based self-leveling material and avoid the bleeding phenomenon of self-leveling gypsum;
(2) The method for increasing the water reducing effect in the gypsum-based self-leveling material provided by the invention can ensure that the gypsum-based self-leveling material has the advantages of good construction operability, convenience in operation, low surface flatness error value after forming and no hollowing and cracking phenomena.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Fluidity detection of II-type anhydrous gypsum-based self-leveling material
Example 1
The embodiment provides a method for increasing the effect of a water reducer in a gypsum-based self-leveling material, which comprises the following steps:
and adding silicate cement into the gypsum-based self-leveling material for three times, and mixing and stirring to obtain mixed slurry.
The gypsum-based self-leveling material is a type II anhydrous gypsum-based self-leveling material, and Portland cement with different contents is respectively added into the type II anhydrous gypsum-based self-leveling material, and is marked as II-1, II-2, II-3, II-4, II-5 and II-6.
The II-type anhydrous gypsum-based self-leveling material comprises the following raw materials in percentage by mass: type II anhydrous gypsum powder with fineness of 350 meshes is 80wt%, heavy calcium powder with fineness of 325 meshes is 19wt%, retarder is 0.5wt%, defoamer is 0.12wt%, cellulose is 0.15wt%, rubber powder is 0.8wt%, water reducer is 0.11wt%, and silicate cement is 0-9 wt%
The Portland cement content, the standard viscosity and the fluidity of the six type II anhydrite-based self-leveling materials are shown in Table 1.
TABLE 1
| Reference numerals | Ⅱ-1 | Ⅱ-2 | Ⅱ-3 | Ⅱ-4 | Ⅱ-5 | Ⅱ-6 |
| Cement content/% | 0 | 1 | 3 | 5 | 7 | 9 |
| pH | 6.60 | 11.24 | 11.65 | 11.84 | 11.95 | 12.03 |
| Thick/% | 23 | 23 | 23 | 23 | 23 | 23 |
| Fluidity/mm | 85 | 122 | 135 | 136 | 140 | 148 |
Example 2
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium hydroxide, and the content of calcium hydroxide was 0 to 0.15wt%.
Calcium hydroxide with different contents is respectively added into the II-type anhydrous gypsum-based self-leveling material, and the II-type anhydrous gypsum-based self-leveling material is marked as II-7, II-8, II-9, II-10, II-11 and II-12.
The calcium hydroxide content, the standard viscosity and the fluidity of the six type II anhydrite-based self-leveling materials are shown in Table 2.
TABLE 2
Example 3
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium oxide, and the content of calcium oxide was 0 to 0.15wt%.
Calcium oxide with different contents is respectively added into the type II anhydrous gypsum-based self-leveling material, and the materials are marked as II-13, II-14, II-15, II-16, II-17 and II-18.
The calcium oxide content, the standard viscosity and the fluidity of the six type II anhydrous gypsum-based self-leveling materials are shown in Table 3.
TABLE 3 Table 3
| Reference numerals | Ⅱ-13 | Ⅱ-14 | Ⅱ-15 | Ⅱ-16 | Ⅱ-17 | Ⅱ-18 |
| CaO content/% | 0 | 0.025 | 0.05 | 0.075 | 0.1 | 0.15 |
| pH | 6.60 | 8.73 | 10.41 | 11.41 | 11.75 | 12.05 |
| Thick/% | 23 | 23 | 23 | 23 | 23 | 23 |
| Fluidity/mm | 85 | 100 | 121 | 132 | 134 | 145 |
As can be seen from the analysis of tables 1 to 3, when the content of the water reducing agent is constant, the silicate cement Ca (OH) 2 And CaO can change the pH value of the II-type anhydrous gypsum-based self-leveling material, so that the fluidity of the II-type anhydrous gypsum-based self-leveling material is affected and obviously increased.
Comparative example 1
This comparative example provides a method of increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that:
this comparative example replaces portland cement with 5wt% type ii anhydrite.
The type II anhydrite-based self-leveling material obtained in this comparative example had a fluidity of 85mm at 23% of the standard.
The comparative example provides a type ii anhydrite based self-leveling material having a significantly lower fluidity than example 1.
Fluidity detection of beta-semi-hydrated gypsum-based self-leveling material
Example 4
The embodiment provides a method for increasing the effect of a water reducer in a gypsum-based self-leveling material, which comprises the following steps:
and adding silicate cement into the gypsum-based self-leveling material for three times, and mixing and stirring to obtain mixed slurry.
The gypsum-based self-leveling material is beta-semi-hydrated gypsum-based self-leveling material, and silicate cements with different contents are respectively added into the beta-semi-hydrated gypsum-based self-leveling material, and the materials are marked as beta-1, beta-2, beta-3, beta-4, beta-5 and beta-6.
The beta-semi-hydrated gypsum-based self-leveling material comprises the following raw materials in percentage by mass: the beta-semi-hydrated gypsum powder with the fineness of 350 meshes is 80wt%, the heavy calcium powder with the fineness of 325 meshes is 10wt%, the retarder is 0.5wt%, the defoamer is 0.2wt%, the cellulose is 0.15wt%, the rubber powder is 0.8wt%, the water reducer is 0.40wt%, and the silicate cement is 0-9 wt%.
The content of calcium carbonate in the heavy calcium powder is 98wt%.
The Portland cement content, the standard viscosity and the fluidity of the six beta-hemihydrate gypsum-based self-leveling materials are shown in Table 4.
TABLE 4 Table 4
| Reference numerals | β-1 | β-2 | β-3 | β-4 | β-5 | β-6 |
| Cement content/% | 0 | 1 | 3 | 5 | 7 | 9 |
| pH | 6.72 | 11.01 | 11.49 | 11.75 | 11.83 | 12.01 |
| Thick/% | 52 | 52 | 52 | 52 | 52 | 52 |
| Fluidity/mm | 135 | 146 | 147 | 155 | 157 | 157 |
Example 5
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium hydroxide, and the content of calcium hydroxide was 0 to 0.15wt%.
Calcium hydroxide with different contents, labeled as beta-7, beta-8, beta-9, beta-10, beta-11 and beta-12, are respectively added into the beta-semi-hydrated gypsum-based self-leveling material.
The calcium hydroxide content, the standard viscosity and the fluidity of the six beta-hemihydrate gypsum-based self-leveling materials are shown in Table 5.
TABLE 5
Example 6
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium oxide, and the content of calcium oxide was 0 to 0.15wt%.
Different contents of calcium oxide, labeled as beta-13, beta-14, beta-15, beta-16, beta-17 and beta-18, are added to the beta-hemihydrate gypsum-based self-leveling material, respectively.
The calcium oxide content, the standard viscosity and the fluidity of the six beta-hemihydrate gypsum-based self-leveling materials are shown in Table 6.
TABLE 6
| Reference numerals | β-13 | β-14 | β-15 | β-16 | β-17 | β-18 |
| CaO content/% | 0 | 0.025 | 0.05 | 0.075 | 0.1 | 0.15 |
| pH | 6.72 | 8.50 | 10.28 | 11.31 | 11.61 | 11.98 |
| Thick/% | 52 | 52 | 52 | 52 | 52 | 52 |
| Fluidity/mm | 135 | 135 | 141 | 145 | 156 | 156 |
As can be seen from the analysis of tables 4 to 6, when the content of the water reducing agent is constant, the silicate cement Ca (OH) 2 And CaO can change the pH value of the beta-semi-hydrated gypsum-based self-leveling material, so that the fluidity of the beta-semi-hydrated gypsum-based self-leveling material is affected and obviously increased.
Comparative example 2
This comparative example provides a method of increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 4 only in that:
this comparative example replaces portland cement with 5wt% beta-hemihydrate gypsum powder.
The beta-hemihydrate gypsum-based self-leveling material obtained in this comparative example had a fluidity of 135mm at 52% of the standard.
The comparative example provides a type ii anhydrite based self-leveling material having a significantly lower fluidity than example 4.
Fluidity detection of alpha-hemihydrate gypsum-based self-leveling material
Example 7
The embodiment provides a method for increasing the effect of a water reducer in a gypsum-based self-leveling material, which comprises the following steps:
and adding silicate cement into the gypsum-based self-leveling material for three times, and mixing and stirring to obtain mixed slurry.
The gypsum-based self-leveling material is an alpha-semi-hydrated gypsum-based self-leveling material, and silicate cements with different contents are respectively added into the alpha-semi-hydrated gypsum-based self-leveling material, and the materials are marked as alpha-1, alpha-2, alpha-3, alpha-4, alpha-5 and alpha-6.
The alpha-semi-hydrated gypsum-based self-leveling material comprises the following raw materials in percentage by mass: the alpha-semi-hydrated gypsum powder with the fineness of 350 meshes is 40wt%, the heavy calcium powder with the fineness of 325 meshes is 49wt%, the retarder is 0.3wt%, the defoamer is 0.15wt%, the cellulose is 0.1wt%, the rubber powder is 0.8wt%, the water reducer is 0.11wt%, and the silicate cement is 0-9 wt%.
The Portland cement content, the standard viscosity, and the fluidity of the six alpha-hemihydrate gypsum-based self-leveling materials are shown in Table 7.
TABLE 7
| Reference numerals | α-1 | α-2 | α-3 | α-4 | α-5 | α-6 |
| Cement content/% | 0 | 1 | 3 | 5 | 7 | 9 |
| pH | 6.73 | 11.20 | 11.63 | 11.85 | 11.95 | 12.08 |
| Thick/% | 28 | 28 | 28 | 28 | 28 | 28 |
| Fluidity/mm | 126 | 137 | 147 | 150 | 159 | 166 |
Example 8
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium hydroxide, and the content of calcium hydroxide was 0 to 0.15wt%.
Calcium hydroxide of different contents, labeled as alpha-7, alpha-8, alpha-9, alpha-10, alpha-11 and alpha-12, are added to the alpha-hemihydrate gypsum-based self-leveling material, respectively.
The calcium hydroxide content, the standard viscosity and the fluidity of the six alpha-hemihydrate gypsum-based self-leveling materials are shown in Table 8.
TABLE 8
Example 9
The present example provides a method for increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 1 only in that: in this example, portland cement was replaced with calcium oxide, and the content of calcium oxide was 0 to 0.15wt%.
Different amounts of calcium oxide, labeled as alpha-13, alpha-14, alpha-15, alpha-16, alpha-17, and alpha-18, were added to the alpha-hemihydrate gypsum-based self-leveling material, respectively.
The calcium oxide content, the standard viscosity and the fluidity of the six alpha-hemihydrate gypsum-based self-leveling materials are shown in Table 9.
TABLE 9
| Reference numerals | α-13 | α-14 | α-15 | α-16 | α-17 | α-18 |
| CaO content/% | 0 | 0.025 | 0.05 | 0.075 | 0.1 | 0.15 |
| pH | 6.73 | 8.68 | 10.31 | 11.49 | 11.74 | 12.05 |
| Thick/% | 28 | 28 | 28 | 28 | 28 | 28 |
| Fluidity/mm | 126 | 129 | 135 | 144 | 149 | 161 |
From an analysis of tables 7-9, it can be seen that, at a given water reducing agent content,portland cement Ca (OH) 2 And CaO can change the pH value of the alpha-hemihydrate gypsum-based self-leveling material, so that the fluidity of the alpha-hemihydrate gypsum-based self-leveling material is affected and obviously increased.
Comparative example 3
This comparative example provides a method of increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials, which differs from example 7 only in that:
this comparative example replaces portland cement with 5wt% alpha-hemihydrate gypsum powder.
The alpha-hemihydrate gypsum-based self-leveling material obtained in this comparative example had a fluidity of 126mm at 52% of the standard.
The comparative example provides a type ii anhydrite based self-leveling material having a significantly lower fluidity than example 7.
In summary, the method for increasing the water reducing effect of the gypsum-based self-leveling material provided by the invention has the advantages that the alkaline material and the water reducing agent act together to further improve the fluidity of the gypsum-based self-leveling material, reduce the addition amount of the water reducing agent, reduce the cost of the gypsum-based self-leveling material, and avoid the bleeding phenomenon of self-leveling gypsum.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (12)
1. A method for increasing the effectiveness of a water reducing agent in a gypsum-based self-leveling material, the method comprising the steps of:
adding an alkaline material into the gypsum-based self-leveling material in batches, and mixing and stirring to obtain mixed slurry with pH value of more than or equal to 8.5;
the alkaline material is Portland cement;
the gypsum-based self-leveling material comprises a water reducing agent;
the gypsum-based self-leveling material comprises any one of an alpha-semi-hydrated gypsum-based self-leveling material, a beta-semi-hydrated gypsum-based self-leveling material or a II-type anhydrous gypsum-based self-leveling material;
the alpha-semi-hydrated gypsum based self-leveling material comprises the following raw materials in percentage by mass: 45-55wt% of alpha-semi-hydrated gypsum powder, 40-50wt% of aggregate, 0.1-0.2wt% of retarder, 0.1-0.25wt% of defoamer, 0.1-0.18wt% of cellulose, 0.5-1wt% of rubber powder and 0.05-0.15wt% of water reducer; the sum of the mass percentages of the raw materials is 100 percent; the fineness of the gypsum powder is 200-500 meshes;
the beta-semi-hydrated gypsum based self-leveling material comprises the following raw materials in percentage by mass: 80-90wt% of beta-semi-hydrated gypsum powder, 10-20wt% of aggregate, 0.2-0.5wt% of retarder, 0.15-0.3wt% of defoamer, 0.1-0.2wt% of cellulose, 0.5-1wt% of rubber powder and 0.3-0.5wt% of water reducer; the sum of the mass percentages of the raw materials is 100 percent; the fineness of the gypsum powder is 200-500 meshes;
the II-type anhydrous gypsum-based self-leveling material comprises the following raw materials in percentage by mass: 80-90wt% of beta-semi-hydrated gypsum powder, 10-20wt% of aggregate, 0.5-1wt% of retarder, 0.1-0.15wt% of defoamer, 0.1-0.2wt% of cellulose, 0.5-1wt% of rubber powder and 0.05-0.15wt% of water reducer; the sum of the mass percentages of the raw materials is 100 percent; the fineness of the gypsum powder is 200-500 meshes.
2. The method for increasing the water reducing effect in a gypsum-based self-leveling material according to claim 1, wherein the number of times of batch division is 3-5.
3. The method of increasing the water reducing effect of gypsum-based self-leveling material according to claim 1, wherein the aggregate comprises sand and/or ground triple superphosphate.
4. A method of increasing the effectiveness of a water reducing agent in a gypsum-based self-leveling material of claim 3 wherein the sand comprises machine-made sand.
5. The method for increasing the water reducing effect in a gypsum-based self-leveling material according to claim 4, wherein the fineness of the machine-made sand is 70-80 mesh.
6. The method for increasing the water reducing effect in gypsum-based self-leveling material according to claim 3, wherein the fineness of the fine calcium carbonate powder is 300 to 350 mesh.
7. A method of increasing the effectiveness of a water reducing agent in gypsum-based self-leveling materials according to claim 3, wherein the calcium carbonate content of the ground calcium carbonate is 95-99% by weight.
8. The method of increasing the effectiveness of a water reducing agent in a gypsum-based self-leveling material of claim 1, wherein the retarder comprises a protein retarder.
9. The method of increasing the water reducing effect in gypsum-based self-leveling materials according to claim 1, wherein the defoamer comprises a silicone-based defoamer.
10. The method of increasing the water reducing effect of a gypsum-based self-leveling material of claim 1, wherein the cellulose comprises hydroxypropyl methylcellulose ether.
11. The method of increasing the water reducing effect in gypsum-based self-leveling material according to claim 1, wherein the viscosity of the cellulose is 350-450mpa.s.
12. The method of increasing the effectiveness of a water reducer in gypsum-based self-leveling materials of claim 1, wherein the water reducer comprises a polycarboxylate-type water reducer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431146A (en) * | 2016-10-09 | 2017-02-22 | 南京工业大学 | Composite gypsum-based self-leveling mortar and preparation method |
| CN112250408A (en) * | 2020-10-22 | 2021-01-22 | 浙江古思建筑科技有限公司 | Gypsum-based self-leveling mortar and application and construction method thereof |
| DE202021103269U1 (en) * | 2021-02-08 | 2021-06-23 | Henan Qiangnai New Materials Co., Ltd. | High-strength, heat and sound insulating gypsum-based flow mortar |
| CN113603447A (en) * | 2021-09-01 | 2021-11-05 | 江苏一夫科技股份有限公司 | Anhydrous gypsum self-leveling material and preparation method and application thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431146A (en) * | 2016-10-09 | 2017-02-22 | 南京工业大学 | Composite gypsum-based self-leveling mortar and preparation method |
| CN112250408A (en) * | 2020-10-22 | 2021-01-22 | 浙江古思建筑科技有限公司 | Gypsum-based self-leveling mortar and application and construction method thereof |
| DE202021103269U1 (en) * | 2021-02-08 | 2021-06-23 | Henan Qiangnai New Materials Co., Ltd. | High-strength, heat and sound insulating gypsum-based flow mortar |
| CN113603447A (en) * | 2021-09-01 | 2021-11-05 | 江苏一夫科技股份有限公司 | Anhydrous gypsum self-leveling material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 朱丽萍.氧化钙对磷建筑石膏砂浆的改性研究.《化工矿物与加工》.2019,(第第4期期),第56-58页. * |
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