CN112299805A - Sand-free desulfurized gypsum self-leveling mortar and preparation method thereof - Google Patents
Sand-free desulfurized gypsum self-leveling mortar and preparation method thereof Download PDFInfo
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- CN112299805A CN112299805A CN202011216759.5A CN202011216759A CN112299805A CN 112299805 A CN112299805 A CN 112299805A CN 202011216759 A CN202011216759 A CN 202011216759A CN 112299805 A CN112299805 A CN 112299805A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 153
- 239000010440 gypsum Substances 0.000 title claims abstract description 153
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 45
- 239000010881 fly ash Substances 0.000 claims abstract description 31
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 239000004576 sand Substances 0.000 claims abstract description 28
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 24
- 239000011707 mineral Substances 0.000 claims abstract description 24
- 239000002253 acid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 2
- 150000007524 organic acids Chemical class 0.000 claims description 2
- 235000005985 organic acids Nutrition 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 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
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000013530 defoamer Substances 0.000 claims 4
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003546 flue gas Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 19
- 238000003756 stirring Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000004566 building material Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/147—Calcium sulfate hemi-hydrate with a specific crystal form beta-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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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 relates to a sand-free desulfurized gypsum self-leveling mortar which comprises the following components in parts by weight: 500 parts of gypsum powder 450 organic sand, 20-80 parts of cement, 20-70 parts of fly ash, 20-80 parts of mineral powder, 5-9 parts of rubber powder, 2-6 parts of defoaming agent, 0.5-1.5 parts of gypsum retarder, 0.5-1.5 parts of water reducing agent and 260 parts of water 200 organic sand. The mortar of the invention adopts flue gas desulfurization gypsum to replace natural gypsum, has low energy consumption, improves the utilization rate of the desulfurization gypsum, simultaneously does not need to add natural sand, and avoids the problem of environmental damage caused by excessive use of sand. The sand-free desulfurized gypsum self-leveling mortar is high in strength and good in fluidity, the strength, the setting time and the fluidity of the mortar meet the requirements of JCT1023-2007 gypsum-based self-leveling mortar, and the mortar has the characteristics of stable quality, simplicity in construction and the like, accords with the national industrial policies of energy conservation, emission reduction and environmental protection, and is beneficial to popularization and application.
Description
Technical Field
The invention relates to a sand-free desulfurized gypsum self-leveling mortar and a preparation method thereof, belonging to the technical field of building materials.
Background
In recent years, the environmental problems in China are more and more concerned by people, and the ecological environmental protection problem must be effectively solved while the economic development is carried out. Therefore, the enterprise is required to balance the current capacity, and the technical equipment industry is urgently needed to be updated to reduce the generation of three wastes and develop the industrial byproduct utilization process.
The desulfurized gypsum is a main byproduct generated by the reaction of an absorbent and sulfur dioxide in flue gas in the process of wet flue gas desulfurization of limestone-gypsum in a coal-fired power plant, has the same main component as natural gypsum, is calcium sulfate dihydrate, has the purity of over 90 percent generally, has low alkali content, no radioactivity and less harmful impurities, and can replace the natural gypsum to be used as a raw material in building material industry. The hydration dynamics, the coagulation characteristics and the process of the desulfurized gypsum are the same as those of natural gypsum, but the speed is high; and displaying according to the data: in 2016, the yield of the desulfurized gypsum in China is about 72.0Mt, the comprehensive utilization amount is 57.9Mt, and the utilization rate is 80.5 percent. In 2018, the yield of the desulfurized gypsum in China is about 71.6Mt, the comprehensive utilization amount is 54.0Mt, and the utilization rate is 75.4%. In germany, japan, etc., where desulfurized gypsum is relatively well used, desulfurized gypsum has been utilized by nearly 100%. Therefore, it is necessary to find a way to use the materials such as architectural decorations, etc., which are the mainstream, and to increase the comprehensive utilization efficiency thereof.
River sand is a fine aggregate for concrete which is used in large quantities in the prior art, and the phenomenon that the river sand is in short supply or even river sand resources are exhausted occurs in many areas. The phenomena of disordered river sand mining and illegal river sand mining are caused, and the safety of river channels, flood control dams and cultivated lands is threatened. A large amount of sea sand is used as building sand in coastal areas, but the content of chloride ions in the sea sand exceeds the standard, and the sea sand can be used only after being desalted, so that the desalting cost is high, otherwise, the steel bars in reinforced concrete are easy to rust, and the service life of a house is directly threatened. Meanwhile, the machine-made sand replacing natural sand needs mining transportation, and processes such as crushing and sand making are time-consuming and long-lasting, and the machine-made sand has multiple crushing sharp corners and reduces fluidity due to large mixing amount.
In the traditional ground construction method at the present stage, the mixed common cement mortar is spread, scraped and plastered, and before the final setting of the mortar, the calendering is carried out for three times. The multilayer operation method has the advantages that sand needs to be added as aggregate to ensure the fluidity of the aggregate, the efficiency is low, the material waste is serious, the hardened ground has poor flatness and is easy to wear, the problems of sand peeling and hollowing cracking often occur, and the appearance and the using effect of a house are seriously influenced. The ground constructed by the self-leveling gypsum has accurate size, high flatness, comfort, elasticity, heat preservation and sound insulation, and the dry density is 30 percent lighter than that of concrete, so that the building load can be effectively reduced, and the earthquake-resistant grade can be improved. The gypsum has micro-expansibility and good thermal stability, and the corresponding gypsum has good volume stability, is not easy to hollowly and is not easy to generate shrinkage cracks. The hardening time is short. The construction thickness (3-80 mm) can be freely selected according to the ground height difference and the design strength. The backfill leveling is completed at one time, the post-curing is not needed, the method is particularly suitable for a ground heating system, the ground heating pipe is covered and leveled at one time, and compared with cement-based mortar needing secondary leveling, the method has the advantages of being prominent.
The Chinese patent with application number of 202010698520.X discloses a sand-free gypsum-based self-leveling mortar and a preparation method thereof, wherein semi-hydrated phosphogypsum and alkaline substances are prepared into the sand-free self-leveling mortar, and the fluidity is good, so that aggregate is not required to be added to further improve the strength and the fluidity of a product, but impurities which are harmful to the hydration performance of the phosphogypsum are generated in the industrial production process of phosphoric acid, the product can be used only by further pretreatment, the process flow is increased, and otherwise the product performance is reduced; the application number 201910633885.1 discloses a sand-free light self-leveling dry powder mortar, which is prepared by adding fly ash, heavy calcium carbonate and perlite into cement serving as a cementing material, wherein the addition amount of ordinary portland cement is 72-75%, the dry density is higher than that of a gypsum-based material, and air bubbles can float on the surface under the condition of high fluidity due to the addition of an air entraining agent, so that the surface perforation phenomenon is generated, and the surface needs to be treated again; the Chinese patent with the application number of 201910624421.4 discloses a ground sand-free leveling composition, a preparation method and a construction method thereof, wherein the density is reduced by adding lightweight aggregate and an air entraining agent into cement, but because the fluidity is high, bubbles in cement paste are not uniformly distributed, or the surface is not flat due to floating on the surface, the layering phenomenon is easy to generate, the strength of an upper layer is low, and the upper layer is easy to wear and dent in actual use.
Therefore, aiming at the problems, the sand-free desulfurized gypsum self-leveling method is developed, waste materials are changed into valuable materials, the desulfurized gypsum is efficiently utilized, and the cost is saved. The method has the advantages of saving resources greatly without river sand, along with small density, light dead weight, excellent sound insulation function, environmental friendliness, energy conservation, safety and the like, and meets the application requirements in modern building engineering.
Disclosure of Invention
The invention aims to solve the defects, and provides sand-free desulfurized gypsum self-leveling mortar, which adopts flue desulfurized gypsum to replace natural gypsum, has low energy consumption, improves the utilization rate of desulfurized gypsum, does not need to add natural sand, avoids the problem of environmental damage caused by excessive use of sand, has good fluidity and extensibility, has a smooth and clean surface, does not need secondary grinding, and can achieve the leveling effect under the condition of different thickness layers.
The invention also aims to provide a preparation method of the sand-free desulfurized gypsum self-leveling mortar.
Technical scheme
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight: 500 parts of gypsum powder 450 organic sand, 20-80 parts of cement, 20-70 parts of fly ash, 20-80 parts of mineral powder, 5-9 parts of rubber powder, 2-6 parts of defoaming agent, 0.5-1.5 parts of gypsum retarder, 0.5-1.5 parts of water reducing agent and 260 parts of water 200 organic sand;
the gypsum powder is one of alpha-semi-hydrated gypsum powder or beta-semi-hydrated gypsum powder; the specific surface area of the gypsum powder is 300-400m2/kg。
The cement is one of ordinary portland cement or portland cement; the ordinary portland cement is PO 42.5; the Portland cement is PII 52.5.
Further, the fly ash is one of first-grade fly ash or second-grade fly ash.
Further, the ore powder is one of S75 type, S95 type and S105 type granulated blast furnace slag powder.
Further, the rubber powder is VAE redispersible rubber powder;
further, the defoaming agent is one of an organic silicon defoaming agent, a polyether defoaming agent and a silicon polyether defoaming agent.
Further, the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
Further, the gypsum retarder is one of organic acids, soluble salts, alkaline phosphates and protein gypsum retarder.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps: putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducer, rubber powder and a defoaming agent into a mortar stirrer according to the parts by weight, mixing and stirring for 5-15 minutes at the rotating speed of 150 plus materials at 200 revolutions per minute, then adding water, and continuously mixing and stirring for 5-15 minutes at the high-speed rotating speed of 500 plus materials at 800 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
The invention has the beneficial effects that: the invention provides sand-free desulfurized gypsum self-leveling mortar, which adopts flue gas desulfurized gypsum to replace natural gypsum, has low energy consumption, improves the utilization rate of desulfurized gypsum, does not need to add natural sand, and avoids the problem of environmental damage caused by excessive use of sand. The sand-free desulfurized gypsum self-leveling mortar prepared by the invention has high strength and good fluidity, the strength, the setting time and the fluidity of the mortar meet the requirements of JCT1023-2007 gypsum-based self-leveling mortar, and the mortar has the characteristics of stable quality, simple construction and the like, conforms to the national industrial policies of energy conservation, emission reduction and environmental protection, and is beneficial to popularization and application.
Drawings
Fig. 1 is an XRD pattern of the sand-free desulfurized gypsum self-leveling mortar of example 1.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments. Lower partThe following examples: the adopted gypsum powder is beta-semi-hydrated gypsum powder, and the specific surface area is 340m2Per kg; the adopted cements are P II 52.5 cement produced by cement Limited company of small field in south of the Yangtze river; the adopted fly ash is first-grade fly ash; the adopted mineral powder is S95 type granulated blast furnace slag powder, which is provided by Beijing Qiangyuan Nissan International trade company Limited; the adopted rubber powder is VAE redispersible rubber powder with the model of 6028 type rubber powder, and is purchased from Jiangsu Mega building materials science and technology limited company; the adopted defoaming agent is a 406 type defoaming agent produced by Suzhou Xingbang chemical building materials Co.Ltd; the adopted gypsum retarders are ZJ-G18 gypsum retarders which are purchased from Jiangsu McJordan building materials science and technology Limited company; the adopted water reducing agents are all ZJ-8300 type polycarboxylic acid high-performance water reducing agents which are purchased from Jiangsu McJordan building materials science and technology limited company, but are not limited to the above.
Example 1
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
480 parts of gypsum powder (beta-semi-hydrated gypsum powder), 60 parts of cement (PII 52.5 cement), 30 parts of fly ash, 30 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar mixer, mixing and stirring for 10 minutes at the rotating speed of 150 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 600 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Fig. 1 is an XRD chart of the sand-free desulfurized gypsum self-leveling mortar of example 1, and it can be seen from fig. 1 that, compared with pure gypsum, the addition of fly ash and mineral powder can promote ettringite to be generated in the early stage of the sample, thereby increasing the strength and compactness and also increasing the self-leveling fluidity.
Example 2
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
470 parts of gypsum powder (beta-semi-hydrated gypsum powder), 30 parts of cement (PII 52.5 cement), 60 parts of fly ash, 30 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar mixer, mixing and stirring for 10 minutes at the rotating speed of 160 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 700 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Example 3
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
490 parts of gypsum powder (beta-semi-hydrated gypsum powder), 25 parts of cement (PII 52.5 cement), 30 parts of fly ash, 55 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar mixer, mixing and stirring for 7 minutes at the rotating speed of 180 revolutions per minute, then adding water, and continuously mixing and stirring for 10 minutes at the rotating speed of 800 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Example 4
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
475 parts of gypsum powder (beta-semi-hydrated gypsum powder), 45 parts of cement (PII 52.5 cement), 40 parts of fly ash, 40 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar stirrer, mixing and stirring for 12 minutes at the rotating speed of 200 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 600 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Example 5
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
485 parts of gypsum powder (beta-semi-hydrated gypsum powder), 45 parts of cement (PII 52.5 cement), 35 parts of fly ash, 35 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar stirrer, mixing and stirring for 12 minutes at the rotating speed of 200 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 600 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Example 6
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
465 parts of gypsum powder (beta-semi-hydrated gypsum powder), 40 parts of cement (PII 52.5 cement), 55 parts of fly ash, 40 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar mixer, mixing and stirring for 15 minutes at the rotating speed of 180 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 650 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Example 7
A sand-free desulfurized gypsum self-leveling mortar comprises the following components in parts by weight:
480 parts of gypsum powder (beta-semi-hydrated gypsum powder), 35 parts of cement (PII 52.5 cement), 35 parts of fly ash, 50 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 245 parts of water.
The preparation method of the sand-free desulfurized gypsum self-leveling mortar comprises the following steps:
putting gypsum powder, cement, fly ash, mineral powder, a gypsum retarder, a water reducing agent, rubber powder and a defoaming agent into a mortar mixer, mixing and stirring for 12 minutes at the rotating speed of 190 revolutions per minute, then adding water, and continuously mixing and stirring for 15 minutes at the rotating speed of 650 revolutions per minute to obtain the sand-free desulfurized gypsum-based self-leveling mortar.
Comparative example 1
The sand-free cement self-leveling mortar comprises the following components in parts by weight:
470 parts of cement (PII 52.5 cement), 30 parts of gypsum powder (beta-semi-hydrated gypsum powder), 60 parts of fly ash, 30 parts of mineral powder, 0.84 part of gypsum retarder (ZJ-G18 gypsum retarder), 0.7 part of polycarboxylic acid high-performance water reducing agent (ZJ-8300 type), 7 parts of rubber powder, 4 parts of defoaming agent and 200 parts of water.
The preparation method of the sand-free cement self-leveling mortar comprises the following steps:
and putting the cement, the gypsum powder, the fly ash, the mineral powder, the gypsum retarder, the water reducer, the rubber powder and the defoaming agent into a mortar mixer, mixing and stirring for 10 minutes at the rotating speed of 160 revolutions per minute, then adding the water, and continuously mixing and stirring for 15 minutes at the rotating speed of 700 revolutions per minute to obtain the sand-free cement self-leveling mortar.
1. The gypsum self-leveling mortar prepared in the embodiments 1-5 is subjected to performance analysis according to JCT1023-2007, and the sand-free cement self-leveling mortar obtained in the comparative example 1 is subjected to performance analysis according to JC/T985-:
table 1 table for analyzing properties of self-leveling mortars of examples 1 to 5 and comparative example 1
2. The results of density performance analysis of the mortars prepared in examples 1 to 5 and comparative example 1 with reference to GB/T5486-2008 are shown in Table 2:
TABLE 2 Density performance test results of examples 1-5 and comparative example 1
3. Taking the mortar samples prepared in examples 1-5 and comparative example 1 for expansion rate performance detection, placing the samples in a standard curing room for curing, demolding after curing for 24 hours at the temperature of 20 +/-1 ℃ and the humidity of 60%, wrapping test blocks with preservative films after demolding, placing the test blocks in a constant-temperature (20 +/-3 ℃) common room for curing, and carrying out expansion performance detection after 30 days, wherein the results are shown in Table 3:
TABLE 3 results of the expansion Properties test of examples 1 to 5 and comparative example 1
Tables 1 to 3 show the test results of the standard performance, density performance and expansion performance of the self-leveling mortar prepared in examples 1 to 5 and comparative example 1 of the present invention, and it can be seen that, compared with the sand-free cement-based self-leveling mortar prepared in comparative example 1, although the sand-free desulfurized gypsum-based self-leveling mortar of the present invention has no great advantage in compressive strength, the compressive strength of the sand-free desulfurized gypsum-based self-leveling mortar is up to 54% above the standard, the flexural strength of the sand-free desulfurized gypsum-based self-leveling mortar is up to 20%, and the low density and other advantages of the gypsum-based self-leveling mortar are not possessed by cement base, so that the mortar is more.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The sand-free desulfurized gypsum self-leveling mortar is characterized by comprising the following components in parts by weight: 500 parts of gypsum powder 450 organic sand, 20-80 parts of cement, 20-70 parts of fly ash, 20-80 parts of mineral powder, 5-9 parts of rubber powder, 2-6 parts of defoaming agent, 0.5-1.5 parts of gypsum retarder, 0.5-1.5 parts of water reducing agent and 260 parts of water 200 organic sand;
the gypsum powder is one of alpha-semi-hydrated gypsum powder or beta-semi-hydrated gypsum powder; the specific surface area of the gypsum powder is 300-400m2/kg；
The cement is one of ordinary portland cement or portland cement.
2. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said cement is PO42.5 or ppi 52.5.
3. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said fly ash is one of a primary fly ash or a secondary fly ash.
4. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said mineral powder is one of granulated blast furnace slag powders of type S75, type S95 and type S105.
5. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said rubber powder is VAE redispersible rubber powder.
6. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said defoamer is one of silicone defoamer, polyether defoamer, silicon polyether defoamer.
7. The sand-free desulfurized gypsum self-leveling mortar of claim 1 wherein said water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
8. The sand-free desulfurized gypsum self-leveling mortar of any one of claims 1 to 7 wherein said gypsum retarder is one of organic acids, soluble salts, alkaline phosphates, protein-based gypsum retarders.
9. The preparation method of the sand-free desulfurized gypsum self-leveling mortar according to any one of claims 1 to 8, characterized in that the gypsum powder, the cement, the fly ash, the mineral powder, the gypsum retarder, the water reducing agent, the rubber powder and the defoaming agent are put into a mortar mixer according to the parts by weight, mixed and stirred for 5 to 15 minutes at the rotation speed of 150 plus materials and 200 rpm, then added with water, and continuously mixed and stirred for 5 to 15 minutes at the high rotation speed of 500 plus materials and 800 rpm, thus obtaining the sand-free desulfurized gypsum-based self-leveling mortar.
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| CN112694343A (en) * | 2021-02-08 | 2021-04-23 | 河南强耐新材股份有限公司 | High-strength heat-preservation sound-insulation gypsum-based self-leveling mortar and preparation method thereof |
| CN113292304A (en) * | 2021-06-17 | 2021-08-24 | 烟台瑞祥干混砂浆有限公司 | Anti-crack gypsum-based self-leveling mortar and preparation process thereof |
| 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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| CN115572141A (en) * | 2022-10-24 | 2023-01-06 | 广东复特新型材料科技有限公司 | Gypsum self-leveling mortar |
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