CN115073115A - Inorganic special self-leveling mortar technology - Google Patents
Inorganic special self-leveling mortar technology Download PDFInfo
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- CN115073115A CN115073115A CN202210695116.6A CN202210695116A CN115073115A CN 115073115 A CN115073115 A CN 115073115A CN 202210695116 A CN202210695116 A CN 202210695116A CN 115073115 A CN115073115 A CN 115073115A
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- Prior art keywords
- self
- leveling mortar
- cement
- gypsum
- sand
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 68
- 238000005516 engineering process Methods 0.000 title abstract description 4
- 239000004568 cement Substances 0.000 claims abstract description 31
- 239000004576 sand Substances 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 18
- 239000006254 rheological additive Substances 0.000 claims abstract description 17
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 16
- 239000004816 latex Substances 0.000 claims abstract description 16
- 229920000126 latex Polymers 0.000 claims abstract description 16
- 150000004645 aluminates Chemical class 0.000 claims abstract description 12
- 239000003469 silicate cement Substances 0.000 claims abstract description 8
- 229920002907 Guar gum Polymers 0.000 claims abstract description 6
- 239000000665 guar gum Substances 0.000 claims abstract description 6
- 235000010417 guar gum Nutrition 0.000 claims abstract description 6
- 229960002154 guar gum Drugs 0.000 claims abstract description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000230 xanthan gum Substances 0.000 claims abstract description 5
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 5
- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 5
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 11
- 239000000701 coagulant Substances 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010881 fly ash Substances 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
- 229910021487 silica fume Inorganic materials 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 150000004683 dihydrates Chemical class 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- JYGQDULZZKKFTG-UHFFFAOYSA-N OS([AlH2])(=O)=O Chemical compound OS([AlH2])(=O)=O JYGQDULZZKKFTG-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000003349 gelling agent Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000000176 sodium gluconate Substances 0.000 description 4
- 229940005574 sodium gluconate Drugs 0.000 description 4
- 235000012207 sodium gluconate Nutrition 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000011975 tartaric acid Substances 0.000 description 4
- 235000002906 tartaric acid Nutrition 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 238000007665 sagging Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229920001732 Lignosulfonate Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 description 2
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 2
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical group O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides an inorganic special self-leveling mortar technology, wherein a rheological additive is added to the self-leveling mortar on the basis of an inorganic gel material, a filler, sand, redispersible latex powder and cellulose ether, and the self-leveling mortar comprises the following components in percentage by mass: 35-42% of inorganic gel, 15-20% of filler, 35-45% of sand, 1-3% of redispersible latex powder, 0.05-0.1% of cellulose ether and 0.03-0.05% of rheological aid, wherein the rheological aid is prepared from any two of modified bentonite, modified montmorillonite, guar gum and xanthan gum according to the mass ratio of 1-2: 1, and further the inorganic gel comprises the following components in percentage by mass: 20-25% of ordinary silicate cement, 11-12% of aluminate cement and 4-5% of gypsum. [08] Furthermore, the strength grade of the ordinary silicate cement is P.O42.5, the aluminate cement is one or two of sulpho-alumina cement and high-alumina cement, and the gypsum is anhydrous gypsum, semi-hydrated gypsum and synthetic self-leveling mortar.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to inorganic special self-leveling mortar.
Background
The self-leveling mortar is developed in the seventies and eighties of the twentieth century, consists of cement-based cementing material, selected aggregate and various additives, is mixed with water to form a self-leveling foundation material with strong flowability and high plasticity, is uniformly mixed with water according to a set water-cement ratio when in use, and forms a flat and smooth surface by self-flowing of the mortar under the action of self-weight after pumping or manual pouring. The self-leveling mortar material has the advantages of easy flowing, stable performance, easy construction, small labor intensity, thin mortar thickness, flatness, smoothness, high strength, good water resistance, acid resistance, erosion resistance and the like, is an ideal material for decorating the ground in large parking lots, warehouses, markets, supermarkets, workshops and the like, is also a development direction of a new technology for constructing indoor and outdoor ground, and has great market potential.
At present, the self-leveling mortar has great problems in application, one is that the requirement on water consumption is accurate, the flow degree is insufficient due to too little water, the requirement on construction cannot be met, and bleeding phenomenon is generated due to too much water, so that the surface strength is too low, so that the harsh condition that the requirement on the water consumption of the self-leveling mortar is accurate brings great inconvenience to the actual construction process, and the self-leveling mortar is greatly hindered in the actual popularization process. Therefore, there is a need to develop a self-leveling mortar that can maintain excellent performance over a wide range of water usage.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the self-leveling mortar with wide water consumption, and compared with the common leveling mortar, the self-leveling mortar with wide water consumption is added with a rheological aid on the basis of inorganic gel materials, fillers, sand, redispersible latex powder and cellulose ether.
Specifically, the invention provides self-leveling mortar which comprises the following components in percentage by mass: 35-42% of inorganic gel, 15-20% of filler, 35-45% of sand, 1-3% of redispersible latex powder, 0.05-0.1% of cellulose ether and 0.03-0.05% of rheological additive.
Further, the rheological aid is composed of any two of modified bentonite, modified montmorillonite, guar gum and xanthan gum according to the mass ratio of 1-2: 1.
Further, the inorganic gel agent comprises the following components in percentage by mass: 20-25% of ordinary silicate cement, 11-12% of aluminate cement and 4-5% of gypsum.
Furthermore, the strength grade of the ordinary silicate cement is P.042.5, the aluminate cement is one or two of sulpho-alumina cement and high-alumina cement, and the gypsum is one or more of anhydrous gypsum, semi-hydrated gypsum and natural dihydrate gypsum.
Furthermore, the filler is one or more of heavy calcium carbonate powder, talcum powder, silica fume, zeolite powder, fly ash or metakaolin, and the fineness of the filler is 200-400 meshes.
Furthermore, the sand is one or two of washing sand, carborundum or quartz sand, and the grain size of the sand is 0-0.236 mm continuous gradation.
Further, the redispersible latex powder is one or more of polyvinyl acetate, acrylate copolymer and styrene-acrylic redispersible latex powder.
Further, the cellulose ether is one or two of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the viscosity is 400-600 mPa.s.
The self-leveling mortar also comprises the following components in percentage by mass: 0.1-0.15% of water reducing agent, 0.05-0.1% of defoaming agent, 0.02-0.1% of retarder and 0.02-0.05% of coagulant.
Preferably, the water reducing agent is one or more of lignosulfonate, naphthalenesulfonate, sulfamate and polycarboxylate, the defoaming agent is one or more of polyethers, organosilicones and phosphates, the retarder is one or more of tartaric acid, sodium gluconate and citric acid, and the coagulant is one or two of lithium sulfate, lithium chloride and lithium carbonate.
The invention has the beneficial effects that: according to the invention, the rheological additive with the functions of suspension, anti-settling, anti-sagging and the like is added into the self-leveling mortar, so that the self-leveling mortar can be ensured to be uniformly distributed in a certain wider range of water consumption, the self-leveling mortar with the water consumption in the wider range greatly improves the fault tolerance of workers in the construction process, and great convenience is provided for the construction process. Therefore, the self-leveling mortar provided by the invention is very high in practicability and has a great popularization value.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the technical solution of the present invention will be further illustrated with reference to the following specific embodiments:
in a specific embodiment of the invention, the invention provides a self-leveling mortar, which comprises the following components in percentage by mass: 35-42% of inorganic gel, 15-20% of filler, 35-45% of sand, 1-3% of redispersible latex powder, 0.05-0.1% of cellulose ether and 0.03-0.05% of rheological additive.
The self-leveling mortar is added with rheological additives on the basis of inorganic gel materials, fillers, sand, redispersible latex powder and cellulose ether. Rheology additives, which are inherently key components of paint and ink coatings, control the delicate properties and characteristics of the fluid product, and "run off" like water without these media. The paint can splash everywhere in the coating process, the covering capacity is reduced, the storage life is shortened, the fluidity of the paint can be adjusted by adopting the rheological aid, the dripping and splashing generated in the roll coating or brush coating process can be reduced, the viscosity of the paint can be rapidly and controllably increased, so that the sagging resistance is improved, the rheological aid can prevent the pigment in the formula from settling in the coating transportation or storage process, and the consistency of the final product, the durability and the good coating characteristic are balanced in a rational manner.
The invention adds the rheological additive with the functions of suspension, anti-sedimentation, anti-sagging and the like into the self-leveling mortar, so that the self-leveling mortar can still keep the performance unchanged under the condition of excessive water consumption, because the filler and the sand with higher density can be sedimented when the water consumption of the self-leveling mortar is excessive, the self-leveling mortar generates the layering phenomenon, namely the surface is redundant water, and the bottom layer is the filler and the sand with higher density, so that the surface bleeding of the self-leveling mortar has no strength and can not meet the requirements of subsequent construction, the rheological additive has the effects of suspension and anti-sedimentation, and after the rheological additive is added, the filler and the sand with higher density in the self-leveling mortar can be suspended in the mortar without sedimentation, so that the upper layer and the lower layer in the self-leveling mortar can be uniformly distributed. The rheological additive is added, so that the effect of uniform distribution of the self-leveling mortar can be ensured within a certain wide range of water consumption, the fault tolerance of workers in the construction process is greatly improved, and great convenience is provided for the construction process.
The rheological additive is composed of any two of modified bentonite, modified montmorillonite, guar gum and xanthan gum according to the mass ratio of 1-2: 1. The components and the rheological additive have the functions of suspension and anti-settling, so that the fluidity of the self-leveling mortar can be increased and the leveling property can be improved under the condition of low water consumption, and bleeding phenomenon can not be generated even under the condition of excessive water consumption, namely the self-leveling mortar can still keep the same performance within a wider water consumption range.
The inorganic gel consists of the following components in percentage by mass: 20-25% of ordinary silicic acid cement, 11-12% of aluminate 4 cement and 4-5% of gypsum. The common portland cement has the functions of providing the mortar with middle and later strength, increasing the early strength of aluminate quickly and hardening the mortar for subsequent construction, and the gypsum in the self-leveling mortar is mainly helpful for expanding the mortar and preventing cracking after construction.
The strength grade of the common silicate cement is P.042.5, the aluminate cement is one or two of sulpho-alumina cement and high-alumina cement, and the gypsum is one or more of anhydrous gypsum, semi-hydrated gypsum and natural dihydrate gypsum.
The filler is one or more of heavy calcium carbonate powder, talcum powder, silica fume, zeolite powder, fly ash or metakaolin, and the fineness of the filler is 200-400 meshes. The filler can improve the workability and the compactness of the mortar, is beneficial to improving the mechanical property, and can also improve the fluidity, the stability and the later strength of the mortar.
The sand is one or two of washing sand, carborundum or quartz sand, and the grain size of the sand is 0-0.236 mm continuous gradation. One or two of washing sand, carborundum and quartz sand are mixed to serve as the aggregate of the cement binder, so that the volume deformation of cementing materials such as cement and the like during hydration can be effectively limited, the bonding strength of the self-leveling mortar can be remarkably improved, and the flexural strength and the compressive strength of the mortar are improved.
The redispersible latex powder is one or more of polyvinyl acetate, acrylate copolymer and styrene-acrylic redispersible latex powder. The redispersible latex powder as a high molecular polymer can effectively form a film in the leveling mortar, reduce the elastic modulus, modify the rigidity of cement, improve the cohesion of the mortar, increase the bonding strength, the wear resistance, the toughness, the impermeability and the impact resistance of the mortar, improve the construction performance and reduce the drying shrinkage, and has certain effects.
The cellulose ether is one or two of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the viscosity is 400-600 mPa.s. The cellulose ether can endow the mortar with thixotropic consistency, reduce the evaporation and absorption of moisture, and is beneficial to prolonging the operable time and improving the stability. Cellulose ether is a high molecular polymer with a three-dimensional network structure, and a plurality of hydrophilic groups exist on a crosslinked network structure, and can be associated with moisture to form hydrogen bonds, hold a large amount of free water and play roles in water retention and thickening.
The self-leveling mortar also comprises the following components in percentage by mass: 0.1-0.15% of water reducing agent, 0.05-0.1% of defoaming agent, 0.02-0.1% of retarder and 0.02-0.05% of coagulant. Although the proportion of the above-mentioned auxiliaries in the self-leveling mortar is very low, each proportion plays an indispensable role.
Preferably, the water reducing agent is one or more of lignosulfonate, naphthalene sulfonate, sulfamate and polycarboxylate, the defoaming agent is one or more of polyethers, organosilicones and phosphate esters, the retarder is one or more of tartaric acid, sodium gluconate and citric acid, and the coagulant is one or two of lithium sulfate, lithium chloride and lithium carbonate.
The water reducing agent has the effects of improving the fluidity of mortar under the condition of low water-cement ratio, reducing the mixing water consumption under the condition of not reducing the fluidity, improving the compactness of a cement hardened body structure and improving the mechanical property. The defoaming agent can eliminate bubbles in the mortar introduced by mechanical stirring and a surfactant, so that the strength is improved, and the surface flatness is improved. In addition, after the bubbles are eliminated, a certain amount of free water can be released, and therefore, the defoaming agent also plays a certain role in water reduction. The retarder has the functions of delaying cement hydration, reducing the loss of fluidity of the self-leveling mortar over time and ensuring the sufficient operation time of the mortar. The coagulant can accelerate the hydration of cement and improve the early strength of mortar, so that the subsequent construction can be carried out.
The following examples further illustrate the above embodiments, but do not therefore limit the invention within the scope of the examples described. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The materials referred to in the examples are all commercially available directly.
The inorganic special self-leveling mortar comprises the following components in percentage by mass: 40% of inorganic gel, 15% of filler, 43% of sand, 1.5% of redispersible latex powder, 0.1% of cellulose ether, 0.03% of rheological additive, 0.12% of water reducing agent, 0.1% of defoaming agent, 0.1% of retarder, 0.05% of coagulant and the balance of water.
Wherein, the inorganic gel comprises the following components in percentage by mass: 25% of ordinary portland cement, 11% of sulphoaluminate cement and 4% of alpha hemihydrate gypsum.
The filler is mixed by coarse whiting and talcum powder according to the mass ratio of 1: 1, and the fineness is 325 meshes.
The sand is washed sand, and the particle size of the sand is 0-0.236 mm.
The re-dispersible latex powder is polyvinyl acetate.
The cellulose ether is hydroxypropyl methyl cellulose ether and has a viscosity of 500 mPa.s.
The rheological additive consists of modified montmorillonite and guar gum in a mass ratio of 1: 1.
The water reducing agent is a polycarboxylic acid water reducing agent, the defoaming agent is organosilicone, the retarder is a mixture of tartaric acid and sodium gluconate, and the coagulant is lithium carbonate.
Example 2
The self-leveling mortar comprises the following components in percentage by mass: 35% of inorganic gel, 16% of filler, 45% of sand, 2% of redispersible latex powder, 0.08% of cellulose ether, 0.04% of rheological additive, 0.15% of water reducing agent, 0.05% of defoaming agent, 0.05% of retarder, 0.04% of coagulant and the balance of water.
Wherein, the inorganic gel comprises the following components in percentage by mass: 20% of ordinary portland cement, 11% of high aluminate cement and 4% of alpha hemihydrate gypsum.
The filler is prepared by mixing silica fume and fly ash according to the mass ratio of 1: 1, and the fineness of the filler is 325 meshes.
The sand is carborundum, and the particle size of the sand is 0-0.236 mm.
The redispersible latex powder is an acrylate copolymer.
The cellulose ether is hydroxyethyl methyl cellulose ether and has a viscosity of 400 mPa.s.
The rheological additive consists of guar gum and xanthan gum in a mass ratio of 1: 1.
The water reducing agent is melamine water reducing agent, the defoaming agent is organic siloxane, the retarder is a mixture of tartaric acid and sodium gluconate, and the coagulant is lithium carbonate.
Claims (4)
1. The inorganic special self-leveling mortar is characterized by comprising the following components in percentage by mass: 35-42% of inorganic gel, 15-20% of filler, 35-45% of sand, 1-3% of redispersible latex powder, 0.05-0.1% of cellulose ether and 0.03-0.05% of rheological additive, wherein the self-leveling mortar is characterized in that the rheological additive is composed of any two of modified bentonite, modified montmorillonite, guar gum and xanthan gum according to the mass ratio of 1-2: 1.
a. The self-leveling mortar is characterized in that the inorganic gel comprises the following components in percentage by mass: 20-25% of ordinary silicate cement, 11-12% of aluminate cement and 4-5% of gypsum.
b. The self-leveling mortar is characterized in that the strength grade of common silicate cement is P.O42.5, the aluminate cement is one or two of sulpho-aluminum cement and high-aluminum cement, and the gypsum is one or more of anhydrous gypsum, semi-hydrated gypsum and natural dihydrate gypsum.
C. The self-leveling mortar is characterized in that the filler is one or more of heavy calcium carbonate powder, talcum powder, silica fume, zeolite powder, fly ash or metakaolin, and the fineness of the filler is 200-400 meshes.
d. The self-leveling mortar is characterized in that the sand is one or two of washing sand, carborundum or quartz sand, and the grain size of the sand is 0-0.236 mm in continuous gradation.
C. The self-leveling mortar is characterized in that the inorganic gel comprises the following components in percentage by mass: 20-25% of ordinary silicate cement, 11-12% of aluminate cement and 4-5% of gypsum.
2. The self-leveling mortar of claim 1, wherein the cellulose ether is one or both of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether and has a viscosity of 400 to 600 mPa.s.
3. The self-leveling mortar according to claim 3, further comprising the following components in percentage by mass: 0.1-0.15% of water reducing agent, 0.05-0.1% of defoaming agent, 0.02-0.1% of retarder and 0.02-0.05% of coagulant.
4. The self-leveling mortar according to claim C, wherein the inorganic gelling agent consists of the following components in percentage by mass: 20-25% of common silicic acid cement, 11-12% of aluminate cement and 4-5% of gypsum.
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| CN115626792A (en) * | 2022-09-29 | 2023-01-20 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Rebound inhibitor for sprayed concrete |
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| CN107963867A (en) * | 2017-12-27 | 2018-04-27 | 北京宝辰联合科技股份有限公司 | A kind of gravity flowing levelling mortar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107963867A (en) * | 2017-12-27 | 2018-04-27 | 北京宝辰联合科技股份有限公司 | A kind of gravity flowing levelling mortar |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115626792A (en) * | 2022-09-29 | 2023-01-20 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Rebound inhibitor for sprayed concrete |
| CN115626792B (en) * | 2022-09-29 | 2023-06-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Rebound inhibitor for sprayed concrete |
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