CN114956756A - High-mixing-amount solid waste base low-shrinkage self-leveling mortar and preparation method thereof - Google Patents
High-mixing-amount solid waste base low-shrinkage self-leveling mortar and preparation method thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 72
- 239000002910 solid waste Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 117
- 235000019738 Limestone Nutrition 0.000 claims abstract description 54
- 239000006028 limestone Substances 0.000 claims abstract description 54
- 239000004568 cement Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 33
- 239000010440 gypsum Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 14
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 13
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 13
- 239000004816 latex Substances 0.000 claims abstract description 11
- 229920000126 latex Polymers 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 9
- -1 polysiloxane Polymers 0.000 claims description 8
- 229920000877 Melamine resin Polymers 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical group OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 6
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical group O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 6
- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000013543 active substance Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 16
- 230000036571 hydration Effects 0.000 description 9
- 238000006703 hydration reaction Methods 0.000 description 9
- 239000000839 emulsion Substances 0.000 description 8
- 239000011083 cement mortar Substances 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—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
- C04B2201/20—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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-volume solid waste base low-shrinkage self-leveling mortar and a preparation method thereof. The self-leveling mortar is prepared from the following raw materials in parts by weight: 1-6 parts of cement, 4-24 parts of desulfurized gypsum, 5-30 parts of limestone powder, 5-10 parts of copper tailing powder, 0.03-0.08 part of retarder, 0.02-0.1 part of water reducing agent, 0-0.02 part of thixotropic agent, 0.3-0.6 part of latex powder, 0-0.1 part of defoaming agent and 0-1 part of cellulose ether; the water-material ratio is 0.2-0.3; the specific surface area of the limestone powder is 650m 2 A particle size distribution in the range from 0.4 to 210 μm/kg. According to the invention, the problems of high viscosity, poor workability, large shrinkage, large apparent density and the like of the self-leveling mortar mixture are solved by utilizing the synergistic effect of the limestone powder, the limestone powder and the cement. The self-leveling mortar provided by the invention has the characteristics of excellent working performance, lower density, low shrinkage, high strength and the like, and the preparation method and the construction process are simple, easy to operate and practical to popularize and applyAnd (4) value.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-volume solid waste base low-shrinkage self-leveling mortar and a preparation method thereof.
Background
The appearance of the traditional mortar brings huge effect to the building industry, but with the continuous improvement of the industrialization degree, the economic level is increasingly improved, the requirements on the performance, the beauty, the process and the environmental protection of the material are gradually improved, the defects of the traditional mortar are gradually highlighted, and the replacement of the mortar by a new material is a necessary development trend. The Self-Leveling ground material (SLMF) has the advantages of good fluidity and stability, simple and rapid construction, low labor intensity, smoothness, high strength, thin Leveling layer thickness, good water resistance, acid resistance and the like, and can just make up for the defects of the traditional mortar. In addition, the applicable admixture, the high-efficiency water reducing agent, the defoaming agent, the expanding agent and other powdery aggregates gradually stabilize and improve various performances of the cement-based self-leveling mortar, and guarantee is provided for the continuous development of the cement-based self-leveling mortar.
Currently self-leveling mortars can be divided into inorganic and organic systems from the difference of cementitious materials. The inorganic system refers to gypsum-based self-leveling mortar and cement-based self-leveling mortar, and the organic system refers to epoxy resin self-leveling mortar. The organic self-leveling material has high manufacturing cost, is not suitable for large-area use, has poor economy, the self-leveling cement mortar is very easy to dry and shrink, and is easy to damage under the condition of dynamic stress in a leveling layer period, so that the service life of ground hoses, other pipelines and facing layer materials is influenced, and the gypsum-based SLMF prepared by taking the desulfurized gypsum as a raw material has the following problems: (1) the gypsum setting time is short, and the pipe blockage phenomenon caused by gypsum setting and curing often occurs; (2) the strength of the desulfurized gypsum based SLMF is lower; (3) the desulfurized gypsum based SLMF has poor water resistance. It is these problems that limit their widespread use.
In order to apply industrial waste to the self-leveling mortar without affecting the performance of the self-leveling mortar material obviously, it is necessary to prepare an economical and energy-saving self-leveling mortar material.
Disclosure of Invention
The invention provides a low-shrinkage self-leveling mortar and a preparation method and application thereof, aiming at solving part of problems in the prior art or at least relieving part of problems in the prior art, aiming at solving the problems that self-leveling cement mortar has large shrinkage, gypsum-based self-leveling mortar has low strength and the like.
The invention is realized in such a way that the high-doped solid waste base low-shrinkage self-leveling mortar is prepared from the following raw materials in parts by weight: 1-6 parts of cement, 4-24 parts of desulfurized gypsum, 5-30 parts of limestone powder, 5-10 parts of copper tailing powder, 0.03-0.08 part of retarder, 0.02-0.1 part of water reducing agent, 0-0.02 part of thixotropic agent, 0.3-0.6 part of latex powder, 0-0.1 part of defoaming agent and 0-1 part of cellulose ether; the water-material ratio is 0.2-0.3; the specific surface area of the limestone powder is 650m 2 Per kg, particle size distribution range of 0.4-210 μm.
In order to solve the problems of large shrinkage of self-leveling cement mortar, low strength of gypsum-based self-leveling mortar and the like, the invention adopts a cement-gypsum composite adhesive material, and the external doping specific surface area is 650m 2 The limestone powder with the particle size distribution range of 0.4-210 mu m is used for improving the working performance, the shrinkage performance, the mechanical performance and the like of the self-leveling mortar by utilizing the filling effect, the dilution effect, the crystal nucleus effect and the chemical effect of the limestone powder in a cement-based material under the synergistic effect of the limestone powder, the limestone powder and the cement. (1) Filling function: when the particle size of the limestone powder is smaller or the mixing amount is larger, the filling effect is obvious, and the proportion of macropores, the critical aperture and the total porosity of the cement-based material are also smaller. The filling effect of the limestone powder reduces the early porosity of the cement-based material, and optimizes the fluidity of the freshly mixed mortar; (2) dilution: limestone powder is almost an inert auxiliary cementing material, the content of the cementing material can be reduced by replacing cement with the limestone powder, so that the hydration products of the cement-based material in unit volume are reduced, namely the dilution effect of the limestone powder, the hydration products of the cement-based material in unit volume are reduced due to the dilution effect of the limestone powder, and the total early hydration heat release amount of the cement-based material is reduced by adding the limestone powder. The larger the limestone powder mixing amount is, the lower the total hydration heat release amount is, so the smaller the volume change is; (3) nucleation: the limestone powder has high activity on the surface, and can adsorb tricalcium silicate (C) 3 S) Ca released during hydration 2+ Ions, reduction of hydrogenThe enrichment and directional arrangement of the calcium oxide crystals at the interface increases the content of C-S-H at the interface, provides nucleation points for hydration products, can accelerate and enhance the hydration of silicate, promotes the growth and precipitation of early hydration products of cement, and improves the strength and toughness of cement hardening slurry; (4) chemical action: the limestone powder has no volcanic ash activity and can not generate gel. However, limestone powder has a slight solubility in water, and dissolved carbonate ions can react with aluminum in portland cement to form monocarbon type (C) 4 ACH 11 Abbreviated to Mc) and half-carbon type calcium carbonate aluminate (C) 4 AC 0.5 H 12 Hc), in which the formation of half-carbon calcium carbonate aluminates consumes Ca (OH) 2 See formulas (1) and (2).
C 3 A+CC+11H→C 4 ACH 11 (1)
C 3 A+0.5CC+0.5CH+11.5H→C 4 AC 0.5 H 12 (2)
In ordinary portland cement, the following reaction occurs:
C 3 A+CaSO 3 → AFt (ettringite), C 3 A + AFt → AFm (calcium sulfoaluminate monosulfate);
and when limestone is present:
C 3 A+CaCO 3 → Mc/Hc (single carbon/half calcium aluminate).
Therefore, the calcium carbonate aluminate is continuously generated by the reaction at the interface of the limestone particles and the hardened cement matrix, the formation of the AFm is inhibited, the generated calcium carbonate aluminate is harder than the AFm, the sizes of the new phase crystals are rapidly increased and are converted into firm and continuous crystal aggregates, the interface of the hardened cement slurry is improved, and the structure of the set cement is more compact. Therefore, the generation of the carbonate aluminate is one of the reasons why the limestone powder improves the strength of the cement mortar and reduces the shrinkage thereof.
Meanwhile, the problems that the fluidity is still low or the fluidity loss is large are solved. The invention selects limestone powder with the grain size range similar to that of cement clinker particles, can form a ball effect and can form a flocculation structure in the hydration process to play a role in deflocculating, thereby improving the working performance of the self-leveling mortar. The particles with the particle size of less than 10 mu m in the cement greatly contribute to the early strength of the cement mortar, the particles with the particle size of 10-30 mu m have better correlation with the strength of 7 d and 28d of the cement mortar, the particles with the particle size of more than 60 mu m are difficult to hydrate and serve as frameworks, and the particles with the particle size of less than 5 mu m of the admixture have the greatest influence on the fluidity and the compressive strength of the cement-based mortar. By optimizing the particle grading of the limestone powder, the limestone powder with the particle size distribution range of 0.4-210 mu m is adopted, and the synergistic development of the physical and chemical actions between the limestone powder and the cement is utilized; copper tailing powder is used as a filling effect to replace natural fine aggregate; the gypsum has the advantages of adjusting coagulation, light weight, sound insulation, fire prevention, heat preservation and the like. The prepared self-leveling mortar has excellent performances of large fluidity, small shrinkage, large strength and the like, and the preparation cost of the self-leveling mortar can be greatly reduced by taking the copper tailing powder and the limestone powder as industrial byproducts, so that the self-leveling mortar has obvious economic and social benefits for the building industry of China.
In addition, the limestone powder is used as an industrial byproduct generated in the process of crushing limestone and producing machine-made sand in a quarry, has low price and stable components, can be used as an auxiliary cementing material to partially replace cement, and effectively reduces the carbon emission in the cement production process.
Preferably, the limestone powder is obtained by grinding for 30min by using a ball mill, and the content of each chemical composition is measured as follows: SiO 2 2 0.52% of Al 2 O 3 0.27% of Fe 2 O 3 0.52 percent of CaO, 52.66 percent of CaO, 44 percent of loss on ignition, CaCO in limestone powder 3 The content of (B) is 92%.
Preferably, SO in copper tailings fines 3 Content (wt.)<1.5% (preferably)<0.85%), water content<15% (preferred)<13%), silicon dioxide content more than or equal to 65% (preferably more than or equal to 68%), and particle size less than or equal to 60 μm.
Preferably, the cement is portland cement. Portland cement of P.O42.5
Preferably, the initial setting time of the desulfurized gypsum is 5-7min, and the final setting time is 10-12 min. The radioactivity and heavy metal completely meet the national standard requirements.
Preferably, the retarder is a hydroxycarboxylic acid retarder powder.
Preferably, the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30%.
Preferably, the thixotropic agent is industrial-grade sodium polyacrylate, the pH value is 7.5, and the solid content is more than or equal to 90 percent; the emulsion powder is an industrial-grade vinyl polymer, the ash content is 13 +/-2%, the binding power is strong, and the water resistance and the weather resistance are good; the defoaming agent is modified polysiloxane, white powder, and the content of effective substances is more than 98%; the cellulose ether is industrial hydroxypropyl methyl cellulose ether, and the effective content is more than or equal to 99 percent.
The invention also provides a preparation method of the high-doping-amount solid waste base low-shrinkage self-leveling mortar, which comprises the following steps:
uniformly mixing cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a thixotropic agent, latex powder, a defoaming agent and cellulose ether (mixing can be carried out by adopting a mixer) to obtain a low-shrinkage self-leveling mortar dry powder; and then adding water for stirring (slowly stirring for 2min, standing for 30s, and quickly stirring for 1min) to obtain the high-doping-amount solid waste base low-shrinkage self-leveling mortar.
The invention has the beneficial effects that: according to the invention, the problems of high viscosity, poor workability, large shrinkage, large apparent density and the like of the self-leveling mortar mixture are solved by utilizing the synergistic effect of the limestone powder, the limestone powder and the cement. The self-leveling mortar provided by the invention has the characteristics of excellent working performance, lower density, low shrinkage, high strength and the like, and the preparation method and the construction process are simple, easy to operate and have practical popularization and application values.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described in the following embodiments to fully understand the objects, aspects and effects of the present invention.
Example 1:
the high-volume solid waste base low-shrinkage self-leveling mortar is prepared from the following raw materials in parts by weight:
3 parts of cement, 12 parts of desulfurized gypsum, 10 parts of limestone powder, 5 parts of copper tailing powder, 0.024 part of retarder, 0.06 part of water reducing agent, 0.012 part of thixotropic agent and 0.012 part of emulsion powder; the water-material ratio is 0.3.
Wherein the cement is ordinary portland cement; the radioactivity and heavy metal of the desulfurized gypsum completely meet the national standard requirements, the initial setting time is about 5-7 minutes, and the final setting time is about 10-12 minutes; the specific surface area of the limestone powder is 650m 2 /kg, the particle size distribution range of the particles is 0.4-210 mu m; copper tailings powder SO 3 Content (c) of<0.85%, water content<13 percent, and the content of silicon dioxide is more than or equal to 68 percent; the retarder is powder hydroxycarboxylic acid retarder; the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30 percent; the thixotropic agent is industrial grade sodium polyacrylate, the pH value is 7.5, and the solid content is more than or equal to 90 percent; the emulsion powder is an industrial-grade vinyl redispersible polymer, the ash content is 13 +/-2%, the binding power is strong, and the water resistance and the weather resistance are good.
The preparation method comprises the following steps:
1) pouring cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a thixotropic agent and emulsion powder which are weighed according to the weight parts of the formula into a mixer to mix for 3min, so that the cementing material and the components are uniformly distributed, and the low-shrinkage self-leveling mortar dry powder is obtained.
2) Pouring the self-leveling mortar dry powder into an electric stirrer, adding water with corresponding weight, slowly stirring for 2min, standing for 30s, and quickly stirring for 1min to obtain the low-shrinkage self-leveling mortar.
Example 2:
the high-doping-amount solid waste base low-shrinkage self-leveling mortar is prepared from the following raw materials in parts by weight:
6 parts of cement, 24 parts of desulfurized gypsum, 20 parts of limestone powder, 5 parts of copper tailing powder, 0.032 part of retarder, 0.04 part of water reducer, 0.016 part of thixotropic agent and 0.032 part of latex powder; the water-to-material ratio was 0.29.
Wherein the cement is ordinary portland cement; the radioactivity and heavy metal of the desulfurized gypsum completely meet the national standard requirements, the initial setting time is about 5-7 minutes, and the final setting time is about 10-12 minutes; the specific surface area of the limestone powder is 650m 2 /kg, the particle size distribution range of the particles is 0.4-210 mu m; copper tailings powder SO 3 Content (wt.)<0.85%, water content<13 percent, and the content of silicon dioxide is more than or equal to 68 percent; the retarder is powder hydroxycarboxylic acid retarder; the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30 percent; the thixotropic agent is industrial grade sodium polyacrylate, the pH value is 7.5, and the solid content is more than or equal to 90 percent; the emulsion powder is an industrial-grade vinyl redispersible polymer, the ash content is 13 +/-2%, the binding power is strong, and the water resistance and the weather resistance are good.
The preparation method comprises the following steps:
1) pouring cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a thixotropic agent and emulsion powder which are weighed according to the weight parts of the formula into a mixer to mix for 3min, so that the cementing material and the components are uniformly distributed, and the low-shrinkage self-leveling mortar dry powder is obtained.
2) Pouring the self-leveling mortar dry powder into an electric stirrer, adding water with corresponding weight, slowly stirring for 2min, standing for 30s, and quickly stirring for 1min to obtain the low-shrinkage self-leveling mortar.
Example 3:
the high-doping-amount solid waste base low-shrinkage self-leveling mortar is prepared from the following raw materials in parts by weight:
1 part of cement, 4 parts of desulfurized gypsum, 5 parts of limestone powder, 5 parts of copper tailing powder, 0.008 part of retarder, 0.02 part of water reducing agent, 0.01 part of defoaming agent, 0.006 part of cellulose ether and 0.006 part of latex powder; the water-to-material ratio was 0.29.
Wherein the cement is ordinary portland cement; the radioactivity and heavy metal of the desulfurized gypsum completely meet the national standard requirements, the initial setting time is about 5-7 minutes, and the final setting time is about 10-12 minutes; the specific surface area of the limestone powder is 650m 2 Per kg, the particle size distribution range of the particles is 0.4-210 mu m; copper tailings powder SO 3 Content (wt.)<0.85%, water content<13 percent, and the content of silicon dioxide is more than or equal to 68 percent; the retarder is powder hydroxycarboxylic acid retarder; the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30 percent; the emulsion powder is an industrial-grade vinyl redispersible polymer, the ash content is 13 +/-2 percent, the adhesive force is strong, and the water resistance and the weather resistance are highIt is preferred. The defoaming agent is modified polysiloxane, white powder, and the content of effective substances is more than 98%; the cellulose ether is industrial grade hydroxypropyl methyl cellulose ether produced by a certain factory in Jiangxi, and is white loose powder, the molecular weight is 20 ten thousand, and the effective content is more than or equal to 99 percent.
The preparation method comprises the following steps:
1) pouring cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a defoaming agent, cellulose ether and latex powder which are weighed according to the weight parts of the formula into a mixer to mix for 3min, so that the cementing material and the components are uniformly distributed and the low-shrinkage self-leveling mortar dry powder is obtained.
2) Pouring the self-leveling mortar dry powder into an electric stirrer, adding water with corresponding weight, slowly stirring for 2min, standing for 30s, and quickly stirring for 1min to obtain the low-shrinkage self-leveling mortar.
Example 4:
the high-volume solid waste base low-shrinkage self-leveling mortar is prepared from the following raw materials in parts by weight:
5 parts of cement, 20 parts of desulfurized gypsum, 15 parts of limestone powder, 10 parts of copper tailing powder, 0.03 part of retarder, 0.1 part of water reducing agent, 0.01 part of defoaming agent, 0.01 part of cellulose ether and 0.02 part of latex powder; the water-to-material ratio was 0.29.
Wherein the cement is ordinary portland cement; the radioactivity and heavy metal of the desulfurized gypsum completely meet the national standard requirements, the initial setting time is about 5-7 minutes, and the final setting time is about 10-12 minutes; the specific surface area of the limestone powder is 650m 2 Per kg, the particle size distribution range of the particles is 0.4-210 mu m; copper tailings powder SO 3 Content (wt.)<0.85%, water content<13 percent, and the content of silicon dioxide is more than or equal to 68 percent; the retarder is powder hydroxycarboxylic acid retarder; the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30 percent; the emulsion powder is an industrial-grade vinyl redispersible polymer, the ash content is 13 +/-2%, the binding power is strong, and the water resistance and the weather resistance are good. The defoaming agent is modified polysiloxane, white powder, and the content of effective substances is more than 98%; the cellulose ether is industrial grade hydroxypropyl methyl cellulose ether produced by a certain factory in Jiangxi, and is white loose powder, the molecular weight is 20 ten thousand, and the effective content is more than or equal to 99 percent.
The preparation method comprises the following steps:
1) pouring cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a defoaming agent, cellulose ether and latex powder which are weighed according to the weight parts of the formula into a mixer to mix for 3min, so that the cementing material and the components are uniformly distributed and the low-shrinkage self-leveling mortar dry powder is obtained.
2) Pouring the self-leveling mortar dry powder into an electric stirrer, adding water with corresponding weight, slowly stirring for 2min, standing for 30s, and quickly stirring for 1min to obtain the low-shrinkage self-leveling mortar.
Detection experiment:
the detection of the related performance is respectively carried out according to GB/T17669.3-1999 determination of mechanical properties of building gypsum, JC/T985-2005 ground cement-based self-leveling mortar, JG/J70-90 basic performance test method of building mortar and GB/T50082-2009 standard test method of long-term performance and durability of common concrete. The results are shown in Table 1.
TABLE 1 building material standards and physical and mechanical properties of the examples
As can be seen from table 1, comparing the standards of gypsum-based and cement-based self-leveling mortar building materials, the physical and mechanical properties in the embodiment of the invention all meet and are superior to the standards, which indicates that the incorporation of limestone powder greatly improves the working performance of self-leveling mortar, and the main reason is the filling effect of the limestone powder, which not only causes the large pore ratio, the critical pore diameter and the total porosity of the self-leveling mortar material to be smaller, but also reduces the early porosity of the self-leveling mortar material, thereby improving the fluidity of the fresh mixed mortar; from the shrinkage data tested in the embodiments 1-4, the shrinkage rate of each example is lower than the standards of gypsum-based and cement-based self-leveling mortar, so the shrinkage of the self-leveling mortar is effectively improved by the doping of the limestone powder.
Therefore, the prepared low-shrinkage solid waste base self-leveling mortar has the performances of excellent working performance, low shrinkage, high strength, good volume stability and the like.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The technical solution and/or the embodiments thereof may be variously modified and varied within the scope of the present invention.
Claims (8)
1. The high-doping-amount solid waste base low-shrinkage self-leveling mortar is characterized by being prepared from the following raw materials in parts by weight: 1-6 parts of cement, 4-24 parts of desulfurized gypsum, 5-30 parts of limestone powder, 5-10 parts of copper tailing powder, 0.03-0.08 part of retarder, 0.02-0.1 part of water reducing agent, 0-0.02 part of thixotropic agent, 0.3-0.6 part of latex powder, 0-0.1 part of defoaming agent and 0-1 part of cellulose ether; the water-material ratio is 0.2-0.3; the specific surface area of the limestone powder is 650m 2 Per kg, particle size distribution range of 0.4-210 μm.
2. The high-content solid waste base low-shrinkage self-leveling mortar according to claim 1, wherein SO in copper tailing powder 3 Content (wt.)<1.5%, water content<15 percent, the content of silicon dioxide is more than or equal to 65 percent, and the grain diameter is less than or equal to 60 mu m.
3. The mortar of claim 1, wherein the cement is portland cement.
4. The high-doped solid waste-based low-shrinkage self-leveling mortar according to claim 1, wherein the initial setting time of the desulfurized gypsum is 5-7min, and the final setting time is 10-12 min.
5. The high-content solid waste base low-shrinkage self-leveling mortar according to claim 1, wherein the retarder is hydroxycarboxylic acid retarder powder.
6. The high-volume solid waste base low-shrinkage self-leveling mortar according to claim 1, wherein the water reducing agent is melamine formaldehyde condensate sulfonate powder, and the water reducing rate is more than 30%.
7. The high-doped solid waste base low-shrinkage self-leveling mortar according to claim 1, wherein the thixotropic agent is industrial-grade sodium polyacrylate, the pH value is 7.5, and the solid content is more than or equal to 90%; the latex powder is an industrial-grade vinyl polymer, the defoaming agent is modified polysiloxane, and the content of active substances is more than 98 percent; the cellulose ether is industrial hydroxypropyl methyl cellulose ether, and the effective content is more than or equal to 99 percent.
8. The preparation method of the high-content solid waste based low-shrinkage self-leveling mortar according to any one of claims 1 to 7, characterized by comprising the following steps:
uniformly mixing cement, desulfurized gypsum, limestone powder, copper tailing powder, a retarder, a water reducing agent, a thixotropic agent, latex powder, a defoaming agent and cellulose ether to obtain a low-shrinkage self-leveling mortar dry powder; and then adding water and stirring to obtain the high-doping-amount solid waste base low-shrinkage self-leveling mortar.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648783A (en) * | 2008-08-11 | 2010-02-17 | 江苏仁和建材科技有限公司 | Method for preparing gypsum-based self-leveling material by using desulfurization gypsum |
| CN101666139A (en) * | 2009-07-27 | 2010-03-10 | 中国建筑材料科学研究总院 | Environment-friendly cement tile mixed with limestone powder and preparation method thereof |
| CN106187002A (en) * | 2016-07-01 | 2016-12-07 | 中材键合科技(蓬莱)有限公司 | A kind of mine discarded tailing gravity flowing levelling mortar and preparation method thereof |
| CN109896806A (en) * | 2019-04-17 | 2019-06-18 | 广东中人岩土工程有限公司 | A kind of mill tailings gravity flowing levelling mortar and preparation method thereof |
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- 2022-05-24 CN CN202210568034.5A patent/CN114956756A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648783A (en) * | 2008-08-11 | 2010-02-17 | 江苏仁和建材科技有限公司 | Method for preparing gypsum-based self-leveling material by using desulfurization gypsum |
| CN101666139A (en) * | 2009-07-27 | 2010-03-10 | 中国建筑材料科学研究总院 | Environment-friendly cement tile mixed with limestone powder and preparation method thereof |
| CN106187002A (en) * | 2016-07-01 | 2016-12-07 | 中材键合科技(蓬莱)有限公司 | A kind of mine discarded tailing gravity flowing levelling mortar and preparation method thereof |
| CN109896806A (en) * | 2019-04-17 | 2019-06-18 | 广东中人岩土工程有限公司 | A kind of mill tailings gravity flowing levelling mortar and preparation method thereof |
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