CN115124315A - Pouring type sand-free self-leveling mortar taking phosphogypsum as main raw material and preparation method and application thereof - Google Patents
Pouring type sand-free self-leveling mortar taking phosphogypsum as main raw material and preparation method and application thereof Download PDFInfo
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- CN115124315A CN115124315A CN202210843773.0A CN202210843773A CN115124315A CN 115124315 A CN115124315 A CN 115124315A CN 202210843773 A CN202210843773 A CN 202210843773A CN 115124315 A CN115124315 A CN 115124315A
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- CN
- China
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- phosphogypsum
- gypsum
- sand
- leveling mortar
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 136
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 130
- 239000002994 raw material Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims description 21
- 239000010440 gypsum Substances 0.000 claims abstract description 123
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 123
- 239000000843 powder Substances 0.000 claims abstract description 71
- 239000000654 additive Substances 0.000 claims abstract description 41
- 230000000996 additive effect Effects 0.000 claims abstract description 38
- 239000000945 filler Substances 0.000 claims abstract description 38
- 150000001875 compounds Chemical class 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 122
- 239000003795 chemical substances by application Substances 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 239000002518 antifoaming agent Substances 0.000 claims description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000004568 cement Substances 0.000 claims description 17
- 150000004683 dihydrates Chemical class 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000012744 reinforcing agent Substances 0.000 claims description 8
- 239000003381 stabilizer Substances 0.000 claims description 8
- 239000000375 suspending agent Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 230000003487 anti-permeability effect Effects 0.000 claims description 7
- 150000001669 calcium Chemical class 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- 239000011863 silicon-based powder Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 40
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000006386 neutralization reaction Methods 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 89
- 239000002245 particle Substances 0.000 description 49
- 239000004575 stone Substances 0.000 description 30
- 230000003449 preventive effect Effects 0.000 description 18
- 235000012239 silicon dioxide Nutrition 0.000 description 18
- 239000000463 material Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 14
- 238000003756 stirring Methods 0.000 description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 13
- 239000011575 calcium Substances 0.000 description 13
- 229910052791 calcium Inorganic materials 0.000 description 13
- 229910052710 silicon Inorganic materials 0.000 description 13
- 239000010703 silicon Substances 0.000 description 13
- 239000004372 Polyvinyl alcohol Substances 0.000 description 12
- 229920002522 Wood fibre Polymers 0.000 description 12
- 239000000839 emulsion Substances 0.000 description 12
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 description 12
- 229920001038 ethylene copolymer Polymers 0.000 description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 12
- 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 description 12
- 238000000034 method Methods 0.000 description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 239000002025 wood fiber Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- 239000004721 Polyphenylene oxide Substances 0.000 description 7
- 238000005336 cracking Methods 0.000 description 7
- 238000007667 floating Methods 0.000 description 7
- 229920000570 polyether Polymers 0.000 description 7
- 229920002545 silicone oil Polymers 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
- 239000012615 aggregate Substances 0.000 description 6
- 230000001680 brushing effect Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 229920000768 polyamine Polymers 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002367 phosphate rock Substances 0.000 description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 239000013530 defoamer Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- QQGISFDJEJMKIL-JAIQZWGSSA-N (5z)-5-[[3-(hydroxymethyl)thiophen-2-yl]methylidene]-10-methoxy-2,2,4-trimethyl-1h-chromeno[3,4-f]quinolin-9-ol Chemical group C1=CC=2NC(C)(C)C=C(C)C=2C2=C1C=1C(OC)=C(O)C=CC=1O\C2=C/C=1SC=CC=1CO QQGISFDJEJMKIL-JAIQZWGSSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 108010082495 Dietary Plant Proteins Proteins 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- ZOYQVVVFGFZXLB-UHFFFAOYSA-N [K].[Mg].[Ca].[Si] Chemical compound [K].[Mg].[Ca].[Si] ZOYQVVVFGFZXLB-UHFFFAOYSA-N 0.000 description 1
- LWNCNSOPVUCKJL-UHFFFAOYSA-N [Mg].[P] Chemical compound [Mg].[P] LWNCNSOPVUCKJL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011426 gypsum mortar Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 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
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/144—Phosphogypsum
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material, which is prepared from the following raw materials in parts by weight: 600-900 parts of compound phosphogypsum powder, 80-600 parts of modified filler and 5-15 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3-3.5. The invention can effectively utilize the industrial waste solid phosphogypsum, changes waste into valuable, saves energy, protects environment and is beneficial to carbon peak reaching and carbon neutralization. The construction method is innovative, and the prepared pouring type sand-free self-leveling mortar is high in flowability, can be automatically leveled when being laid on gravel, and is high in bending and compression strength after later-period maintenance.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material, and a preparation method and application thereof.
Background
The main component of the phosphogypsum is dihydrate gypsum (CaSO) 4 ·2H 2 O), the particle diameter is generally 5-50 μm, the content of crystal water is 20% -25%, the crystal water is a solid byproduct generated in the wet-process phosphoric acid production process, the crystal water is a waste for preparing phosphate fertilizer, and 4-5 tons of phosphogypsum can be generated per 1 ton of phosphorus pentoxide. The composition of the phosphogypsum is complex, besides calcium sulfate, incompletely decomposed phosphorite, residual phosphoric acid, fluoride, acid insoluble substances, organic matters and the like exist, and the existence of fluorine and the organic matters has the greatest influence on the resource utilization of the phosphogypsum. The annual discharge amount of phosphogypsum in China exceeds 7500 million tons, the resource utilization rate is less than 50 percent, the random discharge and accumulation of phosphogypsum not only occupies land resources, but also seriously destroys the ecological environment,impurities such as phosphorus, fluorine and the like in the phosphogypsum can enter soil along with rainwater washing, so that the soil and underground water are polluted. The phosphogypsum can be used as a building material, and opens up a road for the comprehensive application of the phosphogypsum.
Comprehensive utilization of phosphogypsum is very common, the resource utilization approach of the phosphogypsum is mainly used for producing various products such as building gypsum powder, gypsum mortar, building wall boards and slats, cement retarders, cement, silicon-calcium-potassium-magnesium fertilizer and the like at present, and because the added values of the products are lower and limited by the transportation radius, the market coverage area of the products is limited, and the utilization amount of the phosphogypsum is limited.
Gypsum-based self-leveling mortar originated in europe in the sixties of the twentieth century, and in order to solve the corrosion phenomenon of cement concrete to a copper pipe in a floor heating system in europe, gypsum-based floor materials and polyethylene pipes were used in europe, floor heating technologies in europe and america in the 20 th century and the 80 th century were already mature, and gypsum enterprises in the later 80 th century began to make specifications of gypsum-based self-leveling mortar for floor heating applications. The gypsum-based self-leveling mortar is researched at the end of the eighties of the twentieth century in China, the gypsum-based self-leveling mortar is successfully developed by adopting the fluorgypsum waste residues as the cementing materials in 1986, but the performance is poor, and the strength of the materials is improved by adopting the additives to meet the corresponding performance requirements, but the cost of the additives accounts for 2/3 of the production cost of the self-leveling mortar, so that the promotion of the gypsum-based self-leveling mortar in China is seriously hindered, and the international gap is large. With the development of the industry in China, the number of phosphorus chemical enterprises in China is increased, hundreds of millions of tons of industrial by-products phosphogypsum are generated, and the influence on the environment is extremely serious, so that the treatment of the phosphogypsum is not slow.
A self-levelling gypsum-base mortar for building is prepared from semi-hydrated or anhydrous gypsum as main cementing material, fine aggregate, filler and additive through stirring with water, and levelling. The self-leveling floor material has good fluidity and stability, is a floor material for automatically leveling the floor, does not need to be leveled by external force, has high early strength, high construction speed and low labor intensity, and is an important development direction for the floor construction of modern buildings. At present, some manufacturers have started to produce phosphogypsum-based self-leveling products from phosphogypsum, for example:
1. patent application CN202110791248.4 discloses a high-strength phosphogypsum-based self-leveling mortar, which comprises the following components in parts by weight: 700-800 parts of phosphogypsum, 50-80 parts of cement, 0-150 parts of inert filler, 40-80 parts of active filler, 0-150 parts of river sand, 0.5-1.5 parts of defoaming agent, 1.5-2.5 parts of water reducing agent, 0.4-0.5 part of anti-settling agent, 0.2-0.3 part of water retaining agent and 0.2-0.5 part of retarder. The self-leveling mortar does not need to coat an interface agent on a constructed base layer, so that the construction efficiency is improved, and the cost is reduced; and after the phosphogypsum-based self-leveling mortar is hydrated and hardened, the redundant water at the bottom can be dissipated through the base layer without the coating of the interface agent, so that the deformation and cracking phenomena caused by the fact that the water at the bottom of the thick-layer phosphogypsum-based self-leveling mortar is not easy to dissipate are prevented. The method aims to solve the problem of improving the hydration hardening strength of the phosphogypsum-based self-leveling mortar after excessive water is added, so that the phosphogypsum-based self-leveling mortar can easily meet the standard requirement.
2. Patent application cn202010741616.x discloses a phosphogypsum-based self-leveling mortar consisting of the following raw materials: 30-50 parts of alpha-type high-strength gypsum, 0-20 parts of building gypsum powder, 5-15 parts of machine-made sand, 35-45 parts of phosphorite tailing slag, 1-5 parts of fly ash, 0.1-0.5 part of cement, 0.1-0.2 part of water reducing agent, 0.05-0.1 part of water retaining agent, 0.05-0.1 part of defoaming agent and 0.05-0.1 part of redispersible latex powder. The phosphogypsum-based self-leveling mortar takes the phosphogypsum and the phosphorite tailing slag which are large industrial solid wastes as main cementing materials and aggregates, so that the resource and value utilization of the solid wastes are realized, the pollution of the solid wastes to soil and water resources is reduced, the land resources are saved, and the comprehensive cost of self-leveling is reduced. The fluidity is good, the better embodiment of the method has better fluidity under the water cement ratio of about 1:5, and higher strength can be formed within 1d under natural conditions; after being dried, the anti-breaking strength reaches more than 8Mpa, the compressive strength reaches more than 30Mpa, and the fireproof heat-insulating material has good fireproof and heat-insulating properties.
3. Patent application CN202010698520.X discloses a sand-free gypsum-based self-leveling mortar, which comprises water and the following components in parts by weight: 80-97 parts of semi-hydrated phosphogypsum; 3-20 parts of an alkaline substance; 0.1-2 parts of an excitant; 0.35-0.95 parts of an additive. The gypsum-based self-leveling mortar is prepared by using the semi-hydrated phosphogypsum as a byproduct in the semi-hydrated phosphoric acid process, and the semi-hydrated gypsum is dried to remove free water and a small amount of crystal water, so that the energy consumption is greatly reduced, and the gypsum-based self-leveling mortar has a strong cost advantage. According to the method, the semi-hydrated phosphogypsum, the cement, the exciting agent and the additive are mixed in a certain proportion to prepare the self-leveling gypsum product, and the self-leveling gypsum product is high in strength, good in water resistance and good in fluidity, so that the strength and the fluidity of the product are further improved without adding aggregates. According to the method, the semi-hydrated phosphogypsum is used for replacing building gypsum and high-strength gypsum to prepare the gypsum-based self-leveling mortar, so that the phosphogypsum value is effectively developed and utilized.
4. Patent application, CN202010871846.8, discloses a beta phosphogypsum-based self-leveling mortar, which comprises the following raw materials in parts by weight: 55-62 parts of beta-semi-hydrated phosphogypsum powder, 1-3 parts of silicate white cement, 35-40 parts of quartz sand, 0.15-0.25 part of organic silicon waterproof agent, 0.3-0.8 part of latex powder, 0.2-0.4 part of water reducing agent, 0.15-0.3 part of defoaming agent, 0.1-0.25 part of vegetable protein retarder and 0.1-0.3 part of cellulose with the viscosity of more than 20 ten thousand units. The preparation method comprises the following steps: firstly, preparing raw materials in parts by weight; secondly, mixing the beta-semi-hydrated phosphogypsum powder, the silicate white cement and the quartz sand to obtain a mixture, and then finely grinding the mixture to ensure that the specific surface area of the mixture is more than or equal to 650m 2 More than kg; and thirdly, uniformly mixing the mixture after fine grinding with other raw materials to obtain the beta phosphogypsum-based self-leveling mortar. The beta phosphogypsum-based self-leveling mortar prepared by the method has the advantages of high strength, good fluidity, good construction property, good water resistance, no bubbling and layering, environmental protection, energy conservation and the like.
5. Patent application CN201810948957.7 discloses phosphogypsum-based light heat-preservation self-leveling terrace mortar, which comprises main materials and building additives; the main materials comprise building gypsum powder, light aggregate, Portland cement, heavy calcium powder and graded sand; the building gypsum powder is made of phosphogypsum; the building additive comprises a retarder, a water reducing agent, a water retention thickening agent and a leveling agent. The oven-dry breaking strength of the mortar can reach 7.0MPa, the oven-dry compressive strength can reach more than 15.0MPa, and the oven-dry tensile bonding strength can reach 1.1MPa, so that the use requirements of most light-load and medium-load terraces can be met. The method can recycle the phosphogypsum, and uses solid waste furnace bottom slag of a thermal power plant as lightweight aggregate, so that the cost is lower.
In the prior art, phosphogypsum-based self-leveling mortar is divided into two types of sand-free self-leveling mortar and sand-containing self-leveling mortar, wherein the sand-free self-leveling mortar is generally compounded by gypsum powder, a filler and an additive, and the sand-containing self-leveling mortar is generally compounded by gypsum powder, a filler, an additive and fine sand. The construction cost of the sand-free self-leveling mortar is lower than that of the sand-free self-leveling mortar, but the phenomena of hollowing, cracking, surface sanding and black floating (floating and surface of impurities such as gypsum powder organic matters and the like) are easy to occur, and the preparation of products with the strength of more than 20MPa is not suitable; compared with the sand-free self-leveling mortar, the sand-containing self-leveling mortar is suitable for preparing products with the strength of more than 20MPa, but has higher construction cost, poorer construction flowability and the like. The prior documents of the self-leveling mortar disclosed above and other prior documents all have sand self-leveling mortar, and the prepared self-leveling mortar has poor fluidity and workability, is easy to crack, hollowing, sand rising, black floating and the like, and has low compressive strength and high cost.
Disclosure of Invention
The invention provides a pouring type sand-free self-leveling mortar taking phosphogypsum as a main raw material and a preparation method and application thereof to solve the technical problems. The invention can not only achieve the effects of difficult cracking, hollowing, sanding, black floating and high strength of the sand-free self-leveling mortar, but also meet the advantages of good construction flow performance and low cost of the sand-free self-leveling mortar. The invention provides self-leveling mortar with good fluidity and low cost while effectively utilizing phosphogypsum.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 600-900 parts of compound phosphogypsum powder, 80-600 parts of modified filler and 5-15 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3-3.5.
Further, the pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material is prepared from the following raw materials in parts by weight: 700-800 parts of compound phosphogypsum powder, 200-500 parts of modified filler and 8-12 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3.2-3.3.
Further, the pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material is prepared from the following raw materials in parts by weight: 750 parts of compounded phosphogypsum powder, 350 parts of modified filler and 10 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1:3.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h and more than 6.0MPa respectively, and the flexural and compressive strengths of 28d and more than 4.0MPa and 15.0MPa respectively.
Further, the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength reaches more than 45.0 MPa.
Further, the modified filler is prepared from the following raw materials in parts by weight: 5-20 parts of activated calcium powder, 5-20 parts of activated quartz powder, 10-30 parts of superfine modified fly ash, 3-10 parts of superfine silicon powder and 1-2 parts of high-alumina cement.
The modified filler can improve the fluidity of the gypsum-based self-leveling mortar, inhibit the generation of foam and increase the compactness. The used admixture can play a role in reducing water, retarding coagulation, defoaming, retaining water, reinforcing, hardening and other materials with small using amount.
Further, the additive is prepared from the following raw materials in parts by weight: 2-5 parts of water reducing agent, 1-3 parts of retarder, 0.2-0.6 part of defoaming agent, 0.2-0.6 part of stabilizer, 0.1-0.5 part of suspending agent, 0.8-2.0 parts of water-retaining agent and 0.1-1.0 part of reinforcing agent.
The water reducing agent is modified polycarboxylate ether, the retarder is inorganic salt substance, the defoaming agent is polyether modified silicone oil, the stabilizer is polyacrylamide substance, the suspending agent is polycarboxylate substance, the water retaining agent is cellulose ether, and the reinforcing agent is silicon steel element.
Furthermore, after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capacity can reach P4.0.
Further, the preparation method of the pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material is prepared by uniformly mixing the compounded phosphogypsum powder, the modified filler and the additive according to the weight part ratio.
Further, the application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is provided.
Further, the construction method of the pouring type sand-free self-leveling mortar using the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing the phosphogypsum powder, the modified filler and the additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to an operation surface to be constructed by a pump truck, pouring a sandstone layer by virtue of the self-fluidity of the material, forming a leveling layer after self-leveling of the surface, and naturally curing; the stirring time is 2-3 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent is composed of water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fiber and a mildew preventive, and is prepared from the following components in parts by weight: 30-40 parts of water, 40-50 parts of vinyl acetate-ethylene copolymer emulsion, 5-25 parts of polyvinyl alcohol, 6-10 parts of hydroxypropyl methyl cellulose ether, 1-5 parts of organic silicon, 2-10 parts of high-activity silicon dioxide, 2-10 parts of nano-grade active calcium, 2-5 parts of a flatting agent, 0.5-1.2 parts of a defoaming agent, 2-5 parts of superfine wood fiber and 0.2-0.6 part of a mildew preventive; the leveling agent is modified acrylate, the defoaming agent is polyether modified silicone oil, and the mildew preventive is polyamine salt substance.
The special interface agent has three functions of permeation, sealing and reinforcement, can be directly coated on base materials such as concrete, mortar, heat-insulating boards, wood boards and the like, and effectively solves the problems of foaming, cracking, hollowing, infirm bonding and the like of gypsum-based self-leveling mortar.
Furthermore, the sand is continuous gradation or discontinuous gradation with the particle diameter of 2.36-31.5 mm, no sand with the particle diameter larger than 31.5mm or smaller than 2.36mm, the mud content is less than or equal to 1.0 percent, and the stone powder content is less than or equal to 1.0 percent; when the sand is continuously graded, the content of sand with the particle diameter of 19.0-31.5 mm is 50%, the content of sand with the particle diameter of 9.5-19.0 mm is 30%, and the content of sand with the particle diameter of 2.36-9.5 mm is 20%; when the sandstone is in discontinuous grade, the content of the sandstone with the particle diameter of 19.0-31.5 mm is 50%, the content of the sandstone with the particle diameter of 9.5-19.0 mm is 0, and the content of the sandstone with the particle diameter of 2.36-9.5 mm is 50%.
The sand stone is obtained by shaping, screening and grading according to a certain continuous grading or discontinuous grading, wherein the shaping refers to that the sand stone is ground to remove sharp surfaces by a shaping machine, and then screening is carried out to form the sand stone with uniform size and complete grain type, the content of needle-shaped and flaky particles of the shaped sand stone is reduced, the content of irregular polygon is reduced, the sphericity of broken stone particles is improved, the content of cubes reaches 98%, the content of stone powder is low, and fine grains and coarse particles are not separated. Continuously grading, wherein after the sand is sieved in a standard set of sieve, the particles of the mineral aggregate are continuously distributed from large to small, and each grade occupies a proper proportion, for example, the sand with the particle diameter of 2.36-31.5 mm, the sand without the particle diameter of more than 31.5mm or less than 2.36mm, the sand content with the particle diameter of 19.0-31.5 mm is 50%, the sand content with the particle diameter of 9.5-19.0 mm is 30%, and the sand content with the particle diameter of 2.36-9.5 mm is 20%; the discontinuous gradation is formed by removing one or more continuous particle fractions from the middle in the whole interval of the distribution of the sand particles; for example, the sand with the particle diameter of 2.36-31.5 mm and the sand without the particle diameter of more than 31.5mm or less than 2.36mm are adopted, the sand content with the particle diameter of 19.0-31.5 mm is 50 percent, the sand content with the particle diameter of 9.5-19.0 mm is 0, and the sand content with the particle diameter of 2.36-9.5 mm is 50 percent. The shaped and screened sand can effectively improve the fluidity of the gypsum-based self-leveling mortar on the surface of the sand. Continuous or discontinuous grading can be selected according to the required strength and the filling degree.
If the prepared pouring type sand-free self-leveling mortar is used for outdoor construction, the surface of the mortar needs to be subjected to wear-resistant treatment.
When the self-leveling mortar is used for wear resistance treatment during construction, after the ardealite self-leveling mortar is coated with the interfacial agent, the phosphorus-magnesium cement self-leveling mortar is used for surface treatment, the surface strength can reach more than 30MPa after treatment, and the wear resistance can reach 5 degrees.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the pouring type sand-free self-leveling mortar has the advantages of good flowing performance, low cost, capability of fully playing the advantages of self-leveling without sand and stone paste and self-leveling with sand, capability of achieving the effects of difficult cracking, hollowing, sanding, black floating and high strength of the sand self-leveling mortar, and capability of having the advantages of good flowing performance and low cost of the sand-free self-leveling mortar during construction. And a waterproof agent is also added, so that the paint can be used for indoor and outdoor construction.
(2) The invention can effectively utilize the industrial waste solid phosphogypsum, changes waste into valuable, saves energy, protects environment and is beneficial to carbon peak reaching and carbon neutralization. The construction method is innovative, and the prepared pouring type sand-free self-leveling mortar is high in flowability, can be automatically leveled when being laid on gravel, and is high in bending and compression strength after later-period maintenance.
Detailed Description
The following description will explain the embodiments of the present invention in further detail, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are still within the scope of the present invention as claimed in the claims.
Example 1
An injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 600 parts of compound phosphogypsum powder, 80 parts of modified filler and 5 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1:3.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h reach more than 2.5MPa and 6.0MPa respectively, and the flexural and compressive strengths of 28d reach more than 4.0MPa and 15.0MPa respectively; the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength is more than 45.0 MPa; the modified filler is prepared from the following raw materials in parts by weight: 5 parts of activated calcium powder, 5 parts of activated quartz powder, 10 parts of superfine modified fly ash, 3 parts of superfine silicon powder and 1 part of high-alumina cement; the additive is prepared from the following raw materials in parts by weight: 2 parts of water reducing agent, 1 part of retarder, 0.3 part of defoaming agent, 0.2 part of stabilizer, 0.1 part of suspending agent, 0.8 part of water-retaining agent and 0.2 part of reinforcing agent; after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
A preparation method of pouring type sand-free self-leveling mortar with phosphogypsum as a main raw material is prepared by uniformly mixing compound phosphogypsum powder, modified filler and additive according to a weight part ratio.
The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in preparing the sand-free self-leveling mortar terrace is disclosed.
The construction method of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing the phosphogypsum powder, the modified filler and the additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to a working surface to be constructed by a pump truck, pouring a sandstone layer by depending on the self-fluidity of the material, forming a leveling layer after self-leveling the surface, and naturally curing; the stirring time is 2 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent is composed of water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fiber and a mildew preventive, and is prepared from the following components in parts by weight: 30 parts of water, 40 parts of vinyl acetate-ethylene copolymer emulsion, 5 parts of polyvinyl alcohol, 6 parts of hydroxypropyl methyl cellulose ether, 1 part of organic silicon, 2 parts of high-activity silicon dioxide, 2 parts of nano-grade active calcium, 2 parts of a flatting agent, 0.5 part of a defoaming agent, 2 parts of superfine wood fiber and 0.2 part of a mildew preventive; the leveling agent is modified acrylate, the defoaming agent is polyether modified silicone oil, and the mildew preventive is polyamine salt substance; the sand is continuous gradation with the particle diameter of 2.36-31.5 mm, no sand with the particle diameter larger than 31.5mm or smaller than 2.36mm, the mud content is less than or equal to 1.0%, the stone powder content is less than or equal to 1.0%, the sand content with the particle diameter of 19.0-31.5 mm is 50%, the sand content with the particle diameter of 9.5-19.0 mm is 30%, and the sand content with the particle diameter of 2.36-9.5 mm is 20%.
Example 2
An injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 900 parts of compound phosphogypsum powder, 600 parts of modified filler and 15 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3.5.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h reach more than 2.5MPa and 6.0MPa respectively, and the flexural and compressive strengths of 28d reach more than 4.0MPa and 15.0MPa respectively; the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength is more than 45.0 MPa; the modified filler is prepared from the following raw materials in parts by weight: 20 parts of activated calcium powder, 20 parts of activated quartz powder, 30 parts of superfine modified fly ash, 10 parts of superfine silicon powder and 2 parts of high-alumina cement; the additive is prepared from the following raw materials in parts by weight: 5 parts of water reducing agent, 3 parts of retarder, 0.6 part of defoaming agent, 0.6 part of stabilizer, 0.5 part of suspending agent, 2.0 parts of water-retaining agent and 1.0 part of reinforcing agent; after the pouring type sand-free self-leveling mortar is constructed for 1 day, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14 days, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
The preparation method of the pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material comprises the step of uniformly mixing the compound phosphogypsum powder, the modified filler and the additive according to the weight part ratio.
The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is disclosed.
The construction method of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing the phosphogypsum powder, the modified filler and the additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to an operation surface to be constructed by a pump truck, pouring a sandstone layer by virtue of the self-fluidity of the material, forming a leveling layer after self-leveling of the surface, and naturally curing; the stirring time is 2-3 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent is composed of water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fiber and a mildew preventive, and is prepared from the following components in parts by weight: 40 parts of water, 50 parts of vinyl acetate-ethylene copolymer emulsion, 25 parts of polyvinyl alcohol, 10 parts of hydroxypropyl methyl cellulose ether, 5 parts of organic silicon, 10 parts of high-activity silicon dioxide, 10 parts of nano-grade active calcium, 5 parts of a flatting agent, 1.2 parts of a defoaming agent, 5 parts of superfine wood fiber and 0.6 part of a mildew preventive; the leveling agent is modified acrylate, the defoaming agent is polyether modified silicone oil, and the mildew preventive is polyamine salt substance; the sand is in discontinuous gradation with the particle diameter of 2.36-31.5 mm, the sand without the particle diameter of more than 31.5mm or less than 2.36mm, the mud content is less than or equal to 1.0 percent, the stone powder content is less than or equal to 1.0 percent, the sand content with the particle diameter of 19.0-31.5 mm is 50 percent, the sand content with the particle diameter of 9.5-19.0 mm is 0, and the sand content with the particle diameter of 2.36-9.5 mm is 50 percent.
Example 3
An injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 700 parts of compound phosphogypsum powder, 200 parts of modified filler and 8 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3.2.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h respectively reach more than 2.5MPa and 6.0MPa, and the flexural and compressive strengths of 28d respectively reach more than 4.0MPa and 15.0 MPa; the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength is more than 45.0 MPa; the modified filler is prepared from the following raw materials in parts by weight: 10 parts of activated calcium powder, 10 parts of activated quartz powder, 15 parts of superfine modified fly ash, 5 parts of superfine silicon powder and 1.2 parts of high-alumina cement; the additive is prepared from the following raw materials in parts by weight: 3 parts of water reducing agent, 1.5 parts of retarder, 0.3 part of defoamer, 0.3 part of stabilizer, 0.2 part of suspending agent, 1.0 part of water-retaining agent and 0.2 part of reinforcing agent; after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
A preparation method of pouring type sand-free self-leveling mortar with phosphogypsum as a main raw material is prepared by uniformly mixing compound phosphogypsum powder, modified filler and additive according to a weight part ratio.
The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is disclosed.
The construction method of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing the phosphogypsum powder, the modified filler and the additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to an operation surface to be constructed by a pump truck, pouring a sandstone layer by virtue of the self-fluidity of the material, forming a leveling layer after self-leveling of the surface, and naturally curing; the stirring time is 2-3 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent comprises water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fibers and a mildew preventive, and is prepared from the following components in parts by weight: 33 parts of water, 43 parts of vinyl acetate-ethylene copolymer emulsion, 10 parts of polyvinyl alcohol, 7 parts of hydroxypropyl methyl cellulose ether, 2 parts of organic silicon, 3 parts of high-activity silicon dioxide, 3 parts of nano-scale active calcium, 3 parts of a flatting agent, 0.6 part of a defoaming agent, 3 parts of superfine wood fiber and 0.3 part of a mildew preventive; the leveling agent is modified acrylate, the defoaming agent is polyether modified silicone oil, and the mildew preventive is polyamine salt substance; the sand is continuous gradation with the particle diameter of 2.36-31.5 mm, no sand with the particle diameter larger than 31.5mm or smaller than 2.36mm, the mud content is less than or equal to 1.0%, the stone powder content is less than or equal to 1.0%, the sand content with the particle diameter of 19.0-31.5 mm is 50%, the sand content with the particle diameter of 9.5-19.0 mm is 30%, and the sand content with the particle diameter of 2.36-9.5 mm is 20%.
Example 4
An injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 800 parts of compound phosphogypsum powder, 500 parts of modified filler and 12 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3.3.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h reach more than 2.5MPa and 6.0MPa respectively, and the flexural and compressive strengths of 28d reach more than 4.0MPa and 15.0MPa respectively; the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength reaches more than 45.0 MPa; the modified filler is prepared from the following raw materials in parts by weight: 15 parts of activated calcium powder, 15 parts of activated quartz powder, 25 parts of superfine modified fly ash, 8 parts of superfine silicon powder and 1.8 parts of high-alumina cement; the additive is prepared from the following raw materials in parts by weight: 4 parts of water reducing agent, 2.5 parts of retarder, 0.5 part of defoaming agent, 0.5 part of stabilizer, 0.4 part of suspending agent, 1.7 parts of water-retaining agent and 0.8 part of reinforcing agent; after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
A preparation method of pouring type sand-free self-leveling mortar with phosphogypsum as a main raw material is prepared by uniformly mixing compound phosphogypsum powder, modified filler and additive according to a weight part ratio.
The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is disclosed.
The construction method of the pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing phosphogypsum powder, modified filler and additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to an operation surface to be constructed by a pump truck, pouring a sandstone layer by virtue of the self-fluidity of the material, forming a leveling layer after self-leveling of the surface, and naturally curing; the stirring time is 2-3 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent is composed of water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fiber and a mildew preventive, and is prepared from the following components in parts by weight: 38 parts of water, 47 parts of vinyl acetate-ethylene copolymer emulsion, 20 parts of polyvinyl alcohol, 9 parts of hydroxypropyl methyl cellulose ether, 4 parts of organic silicon, 9 parts of high-activity silicon dioxide, 9 parts of nano-grade active calcium, 4 parts of a flatting agent, 1.0 part of a defoaming agent, 4 parts of superfine wood fiber and 0.5 part of a mildew preventive; the leveling agent is modified acrylate, the defoaming agent is polyether modified silicone oil, and the mildew preventive is polyamine salt substance; the sand is in discontinuous gradation with the particle diameter of 2.36-31.5 mm, the sand without the particle diameter larger than 31.5mm or smaller than 2.36mm contains mud less than or equal to 1.0 percent, contains stone powder less than or equal to 1.0 percent, contains 50 percent of sand with the particle diameter of 19.0-31.5 mm, contains 0 percent of sand with the particle diameter of 9.5-19.0 mm, and contains 50 percent of sand with the particle diameter of 2.36-9.5 mm.
Example 5
An injection type sand-free self-leveling mortar taking phosphogypsum as a main raw material is prepared from the following raw materials in parts by weight: 750 parts of compounded phosphogypsum powder, 350 parts of modified filler and 10 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1:3.
Further, the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous III type (AIII) gypsum is less than or equal to 5 percent, the content of anhydrous II type (AII) gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum (HH) is more than or equal to 60 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h respectively reach more than 2.5MPa and 6.0MPa, and the flexural and compressive strengths of 28d respectively reach more than 4.0MPa and 15.0 MPa; the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of alpha-type semi-hydrated gypsum (HH) is more than or equal to 75 percent, the content of dihydrate gypsum (DH) is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength reaches more than 45.0 MPa; the modified filler is prepared from the following raw materials in parts by weight: 12 parts of activated calcium powder, 13 parts of activated quartz powder, 20 parts of superfine modified fly ash, 6 parts of superfine silicon powder and 1.5 parts of high-alumina cement; the additive is prepared from the following raw materials in parts by weight: 3.5 parts of water reducing agent, 2 parts of retarder, 0.4 part of defoaming agent, 0.4 part of stabilizer, 0.3 part of suspending agent, 1.5 parts of water-retaining agent and 0.5 part of reinforcing agent; after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
A preparation method of pouring type sand-free self-leveling mortar with phosphogypsum as a main raw material is prepared by uniformly mixing compound phosphogypsum powder, modified filler and additive according to a weight part ratio.
The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is disclosed.
The construction method of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material comprises the following steps:
(1) preparing the pouring type sand-free self-leveling mortar: uniformly mixing the phosphogypsum powder, the modified filler and the additive, and conveying to a construction site;
(2) cleaning the working surface to be constructed, brushing two construction special interface agents, paving the sand stones which are shaped, screened and prepared according to certain continuous gradation or discontinuous gradation on the working surface to be constructed, wherein the paving thickness of the sand stones is that slurry with the thickness of 1-2 cm can be paved on the upper surface of the sand stones; the mass ratio of the sand to the poured sand-free self-leveling mortar is 4: 1;
(3) uniformly stirring the poured phosphogypsum-based sand-free self-leveling mortar in the step (1), pumping or directly unloading to an operation surface to be constructed by a pump truck, pouring a sandstone layer by virtue of the self-fluidity of the material, forming a leveling layer after self-leveling of the surface, and naturally curing; the stirring time is 2-3 min; and the natural curing is that the natural curing is not less than 14 days at normal temperature.
Further, the special interface agent is composed of water, vinyl acetate-ethylene copolymer emulsion, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, organic silicon, high-activity silicon dioxide, nano-grade active calcium, a leveling agent, a defoaming agent, superfine wood fiber and a mildew preventive, and is prepared from the following components in parts by weight: 35 parts of water, 45 parts of vinyl acetate-ethylene copolymer emulsion, 15 parts of polyvinyl alcohol, 8 parts of hydroxypropyl methyl cellulose ether, 3 parts of organic silicon, 6 parts of high-activity silicon dioxide, 6 parts of nano-grade active calcium, 3 parts of a flatting agent, 0.9 part of a defoaming agent, 4 parts of superfine wood fiber and 0.4 part of a mildew preventive; the flatting agent is modified acrylate, the defoamer is polyether modified silicone oil, and the mildew preventive is polyamine salt substance; the sand is continuous gradation with the particle diameter of 2.36-31.5 mm, no sand with the particle diameter larger than 31.5mm or smaller than 2.36mm, the mud content is less than or equal to 1.0%, the stone powder content is less than or equal to 1.0%, the sand content with the particle diameter of 19.0-31.5 mm is 50%, the sand content with the particle diameter of 9.5-19.0 mm is 30%, and the sand content with the particle diameter of 2.36-9.5 mm is 20%.
Comparative example 1
The difference from the example 1 is that: the dosage of the compound phosphogypsum powder is 1000 parts, and the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 6; other conditions were unchanged.
Comparative example 2
The difference from the embodiment 1 is that: the construction method is different and comprises the following steps: adding water into phosphogypsum powder, modified filler, additive and fine sand in a construction site according to a certain proportion, stirring, and performing base treatment, coating an interface agent, paving, defoaming, protecting a finished product and the like to meet construction requirements; other conditions were unchanged.
Comparative example 3
The preparation of high strength phosphogypsum based self-leveling mortar was carried out by the method of patent application CN202110791248.4 (a high strength phosphogypsum based self-leveling mortar) example 1.
Comparative example 4
The preparation of a phosphogypsum-based self-levelling mortar was carried out by the method of patent application cn202010741616.x (a phosphogypsum-based self-levelling mortar), example 1.
To further illustrate that the present invention can achieve the technical effects, the following experiments were performed:
the self-leveling mortar is prepared by the methods of examples 1 to 5 and comparative examples 1 to 4, and the physical performance test is carried out according to JC/T1023-2007 Standard of Gypsum-based self-leveling mortar. At the same time preparingPouring the good self-leveling mortar on the ground without the interface agent treatment, and recording initial setting time/min, final setting time/min and 14d apparent density/kg/m 3 Anti-seepage performance, softening coefficient and cost (yuan/m) 2 ) And compressive strengths of 1d, 7d, and 14d, the experimental results are shown in table 1 below.
TABLE 1
The pouring type sand-free self-leveling mortar is used for construction, the advantages of self-leveling without sand and stone paste and self-leveling with sand can be fully exerted, the effects of difficult cracking, hollowing, sanding, floating black and high strength of the sand self-leveling mortar can be achieved, the advantages of good construction flow property and low cost of the sand-free self-leveling mortar can be possessed, the defects of the traditional construction process at present are effectively avoided, and the mortar has the advantages of no cracking, no hollowing, sanding, floating black, strong bonding force and high strength, and also has the advantages of simplicity and convenience in construction, good construction flow property, low cost and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. The pouring type sand-free self-leveling mortar with the phosphogypsum as the main raw material is characterized by being prepared from the following raw materials in parts by weight: 600-900 parts of compound phosphogypsum powder, 80-600 parts of modified filler and 5-15 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3-3.5.
2. The pouring type sand-free self-leveling mortar taking phosphogypsum as a main raw material according to claim 1 is characterized by being prepared from the following raw materials in parts by weight: 700-800 parts of compound phosphogypsum powder, 200-500 parts of modified filler and 8-12 parts of additive; the compound phosphogypsum powder is prepared by mixing alpha-type high-strength gypsum and mixed-phase gypsum according to the mass ratio of 1: 3.2-3.3.
3. The pouring type sand-free self-leveling mortar taking phosphogypsum as a main raw material according to claim 1 or 2, which is characterized in that: the mixed phase gypsum is prepared from the following raw materials in percentage by weight: the content of anhydrous type III gypsum is less than or equal to 5 percent, the content of anhydrous type II gypsum is more than or equal to 20 percent, the content of beta type semi-hydrated gypsum is more than or equal to 60 percent, the content of dihydrate gypsum is less than or equal to 5 percent, the initial setting time of the mixed phase gypsum is more than or equal to 10min, the final setting time is less than or equal to 120min, the flexural and compressive strengths of 2h and more than 6.0MPa respectively, and the flexural and compressive strengths of 28d and more than 4.0MPa and 15.0MPa respectively.
4. The pouring type sand-free self-leveling mortar mainly prepared from phosphogypsum according to claim 1 or 2, which is characterized in that: the alpha-type high-strength gypsum is prepared from the following raw materials in percentage by weight: the content of the alpha-type semi-hydrated gypsum is more than or equal to 75 percent, the content of the dihydrate gypsum is less than or equal to 5 percent, the initial setting time of the alpha-type high-strength gypsum is more than or equal to 15min, the final setting time is less than or equal to 40min, the 2h flexural strength reaches more than 5.0MPa, and the drying compressive strength reaches more than 45.0 MPa.
5. The pouring type sand-free self-leveling mortar taking phosphogypsum as a main raw material according to claim 1 or 2, which is characterized in that: the modified filler is prepared from the following raw materials in parts by weight: 5-20 parts of activated calcium powder, 5-20 parts of activated quartz powder, 10-30 parts of superfine modified fly ash, 3-10 parts of superfine silicon powder and 1-2 parts of high-alumina cement.
6. The pouring type sand-free self-leveling mortar taking phosphogypsum as a main raw material according to claim 1 or 2, which is characterized in that: the additive is prepared from the following raw materials in parts by weight: 2-5 parts of water reducing agent, 1-3 parts of retarder, 0.2-0.6 part of defoaming agent, 0.2-0.6 part of stabilizer, 0.1-0.5 part of suspending agent, 0.8-2.0 parts of water-retaining agent and 0.1-1.0 part of reinforcing agent.
7. The pouring type sand-free self-leveling mortar mainly prepared from phosphogypsum according to claim 1 or 2, which is characterized in that: after the pouring type sand-free self-leveling mortar is constructed for 1d, the compressive strength can reach more than 10.0MPa, the compressive strength can reach more than 20.0MPa after natural curing for 14d, the softening coefficient can reach more than 0.7, and the anti-permeability capability can reach P4.0.
8. The preparation method of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material is characterized by comprising the following steps: the composite phosphogypsum powder, the modified filler and the additive are uniformly mixed according to the weight part ratio.
9. The application of the pouring type sand-free self-leveling mortar taking the phosphogypsum as the main raw material in the preparation of the sand-free self-leveling mortar terrace is disclosed.
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| CN114230300A (en) * | 2022-01-07 | 2022-03-25 | 四川齐能新型材料有限公司 | Multifunctional two-component gypsum-based self-leveling mortar and mortar construction mode |
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| US20140121303A1 (en) * | 2011-07-01 | 2014-05-01 | Wacker Chemie Ag | Gypsum-containing construction material compounds |
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