CN115324303A - Gypsum-based self-leveling mortar floor interface treatment method - Google Patents
Gypsum-based self-leveling mortar floor interface treatment method Download PDFInfo
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- CN115324303A CN115324303A CN202211195989.7A CN202211195989A CN115324303A CN 115324303 A CN115324303 A CN 115324303A CN 202211195989 A CN202211195989 A CN 202211195989A CN 115324303 A CN115324303 A CN 115324303A
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- Prior art keywords
- gypsum
- leveling mortar
- based self
- interface
- agent
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- 239000010440 gypsum Substances 0.000 title claims abstract description 228
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 228
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 197
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 222
- 239000004567 concrete Substances 0.000 claims abstract description 134
- 239000004568 cement Substances 0.000 claims abstract description 105
- 239000000463 material Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 239000000843 powder Substances 0.000 claims description 75
- 239000000839 emulsion Substances 0.000 claims description 67
- 229920000642 polymer Polymers 0.000 claims description 42
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- 238000002156 mixing Methods 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 34
- 239000006004 Quartz sand Substances 0.000 claims description 32
- 239000002518 antifoaming agent Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 29
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 27
- 239000011707 mineral Substances 0.000 claims description 27
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 25
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 22
- 238000005507 spraying Methods 0.000 claims description 22
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 21
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 21
- 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 21
- 239000004816 latex Substances 0.000 claims description 18
- 229920000126 latex Polymers 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 16
- 239000002562 thickening agent Substances 0.000 claims description 15
- -1 acrylic ester Chemical class 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 14
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 12
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 230000001680 brushing effect Effects 0.000 claims description 7
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 7
- 239000013530 defoamer Substances 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 6
- 229920001038 ethylene copolymer Polymers 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 230000008719 thickening Effects 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 229920005610 lignin Polymers 0.000 claims description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 42
- 238000005336 cracking Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 107
- 230000008569 process Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 19
- 238000012360 testing method Methods 0.000 description 18
- 150000004683 dihydrates Chemical class 0.000 description 17
- 238000006703 hydration reaction Methods 0.000 description 16
- 239000002002 slurry Substances 0.000 description 16
- 239000002893 slag Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 14
- 238000007789 sealing Methods 0.000 description 14
- 239000000919 ceramic Substances 0.000 description 13
- 238000004381 surface treatment Methods 0.000 description 13
- 230000001070 adhesive effect Effects 0.000 description 11
- 239000002699 waste material Substances 0.000 description 11
- 230000036571 hydration Effects 0.000 description 10
- 239000011575 calcium Substances 0.000 description 9
- 229920000620 organic polymer Polymers 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 229910001653 ettringite Inorganic materials 0.000 description 8
- 229920006254 polymer film Polymers 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000740 bleeding effect Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 206010016807 Fluid retention Diseases 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229920006222 acrylic ester polymer Polymers 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- OCKPCBLVNKHBMX-UHFFFAOYSA-N butylbenzene Chemical compound CCCCC1=CC=CC=C1 OCKPCBLVNKHBMX-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/066—Precipitated or pyrogenic silica
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
- E04F15/182—Underlayers coated with adhesive or mortar to receive the flooring
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
-
- 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
-
- 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)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Floor Finish (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a gypsum-based self-leveling mortar terrace interface treatment method, which is characterized in that before the gypsum-based self-leveling mortar is poured, a sulphoaluminate cement-based interface agent is coated on the surface of the concrete floor, and the sulphoaluminate cement-based interface agent adopts fast-hardening sulphoaluminate cement as a bonding material. The invention has the characteristics of simple and convenient construction, capability of obviously improving the interface bonding strength of the gypsum self-leveling mortar and the concrete ground and capability of preventing the floor of the gypsum self-leveling mortar from hollowing and cracking.
Description
Technical Field
The invention relates to the field of building construction based on gypsum-based self-leveling mortar, in particular to a gypsum-based self-leveling mortar terrace interface treatment method.
Background
The gypsum-based self-leveling mortar is a green building material prepared by using semi-hydrated gypsum or II type anhydrous gypsum as a main cementing material and adding functional components such as fine aggregate, ultrafine mineral admixture, admixture and the like, and is mainly used for a concrete floor pavement layer or a leveling layer and can also be used for a heat insulation layer of a floor heater.
The building gypsum has high setting and hardening speed and micro-expansion characteristics after hardening, and the gypsum-based self-leveling mortar is used as the terrace, so that the construction speed can be increased, and the problem that the cement-based self-leveling mortar is easy to crack due to large shrinkage can be avoided. The gypsum-based self-leveling mortar has good fluidity, does not need to be maintained after pouring, and can reduce the construction strength and the labor capacity of constructors. The gypsum hardening body contains a large number of micropores, the porosity can reach 60% generally, and the gypsum-based self-leveling mortar floor has good heat preservation, sound insulation and moisture absorption characteristics, so that the gypsum-based self-leveling mortar floor has the advantages of heat preservation, sound insulation, high comfort level and the like, and the large-scale application of the gypsum-based self-leveling mortar floor not only contributes to improving the comfort level of human living environment, but also contributes to building energy conservation. In addition, the gypsum-based self-leveling mortar usually adopts building gypsum prepared by taking industrial by-product gypsum as a raw material as a cementing material, and the large-scale application of the gypsum-based self-leveling mortar is also beneficial to improving the resource utilization level and the comprehensive utilization rate of the building material of the industrial by-product gypsum and solving the problem of environmental pollution caused by the large-scale stockpiling of the industrial by-product gypsum.
Due to the fact that the gypsum-based self-leveling mortar has a plurality of technical advantages, the application scale of the gypsum-based self-leveling mortar is rapidly enlarged, in the popularization and application process of the gypsum-based self-leveling mortar, due to the fact that the auxiliary material is not matched with the physical and mechanical properties of the gypsum-based self-leveling mortar or the use measures of the auxiliary material are unreasonable, even matched auxiliary materials are lacked, and the construction process and process control of the gypsum-based self-leveling mortar are unreasonable, the problems that a gypsum-based self-leveling mortar terrace is large in area and is hollow and cracked, many surface air holes exist, the quality is poor and the like are caused, the large-scale popularization and application of the gypsum-based self-leveling mortar are severely restricted, and even the application of the gypsum-based self-leveling mortar is greatly limited.
The existing gypsum-based self-leveling mortar construction process mainly comprises the following steps: the method comprises the following steps of cleaning and processing a base layer, coating an interface agent, pouring construction of self-leveling mortar, surface treatment and maintenance and the like, wherein the coating of the interface agent is beneficial to solving the technical problems of hollowing, cracks, poor flatness and the like of the gypsum-based self-leveling mortar. The interface agent is an important auxiliary material in the gypsum-based self-leveling mortar construction process, and the type and construction mode of the interface agent have decisive effects on the interface bonding strength of the gypsum-based self-leveling mortar and a concrete base layer and the construction quality of the gypsum-based self-leveling mortar.
The interface agent is an important auxiliary material of the gypsum-based self-leveling mortar, and the interface agent commonly used for treating the gypsum-based self-leveling mortar terrace base layer comprises an organic interface agent and an inorganic interface agent. Wherein the organic interface agent comprises ethylene-vinyl acetate copolymer emulsion, butylbenzene emulsion, acrylic ester emulsion, epoxy resin and the like; common inorganic interfacial agents include mainly building gypsum-based materials and building gypsum and polymer emulsion composites.
The adoption of organic polymer emulsion as an interface agent is a common way to improve the interface bonding strength between materials such as concrete, mortar and the like and other base layer materials. Before the gypsum-based self-leveling mortar is constructed, the organic polymer emulsions are usually adopted as interface agents. The polymer emulsion interface agent is usually sprayed or brushed by adopting a secondary spraying mode, and the interval time between the two spraying modes depends on the environment temperature and humidity, the film forming time of the polymer emulsion and the like. The construction of spraying the polymer emulsion interface agent is simple, but the film forming time of the polymer emulsion is greatly different from a theoretical value in actual engineering, if the gypsum-based self-leveling mortar pouring construction is carried out without forming the film of the polymer emulsion, the film layer and the interface of the polymer emulsion can be damaged, and the interface treatment effect is reduced; if the gypsum-based self-leveling mortar is not poured in time after the film is formed, the polymer emulsion film layer can peel and crack, so that the gypsum-based self-leveling mortar floor is hollowly and even peels off.
In addition, when the organic polymer emulsion is used as an interface agent of the gypsum-based self-leveling mortar, the temperature and humidity change of the construction environment can also have a significant influence on the application effect of the gypsum-based self-leveling mortar, so that in the actual application, a constructor can hardly and accurately master the reasonable pouring time of the gypsum-based self-leveling mortar, and the construction quality of the gypsum-based self-leveling mortar is reduced. In addition, the water content of the base layer also has a significant influence on the film formation and the interface bonding strength of the organic polymer emulsion interface agent. The organic polymer emulsion is used as an interface agent, so that the requirement on the water content of the base concrete is high. When the water content of the base layer concrete is higher, the evaporation of water in the concrete can damage the polymer emulsion to form a film, so that the polymer emulsion is difficult to form the film effectively; when the water content of the base layer concrete is extremely low, the concrete can adsorb the polymer solution, and the polymer emulsion is difficult to form a film effectively.
Therefore, the organic polymer emulsion is used as the interface agent, and although the labor intensity is low, the construction is simple and the construction efficiency is high, the defect that the film forming time of the polymer emulsion is difficult to accurately control exists; and the film forming time is influenced by factors such as environment temperature and humidity, the water content of the base layer concrete and the like, so that the film forming effect is obviously reduced, the bonding strength of the gypsum-based self-leveling mortar and the concrete base layer is reduced on the contrary, a large number of air holes are generated on the surface, and even serious quality problems such as hollowing, cracking and the like occur.
In order to solve the problems of the organic polymer emulsion interface agent in the application process, engineers and technicians begin to use inorganic interface agents such as gypsum-based interface agents, for example, building gypsum slurry is coated or sprayed on a concrete base layer, or building gypsum and polymer emulsion composite slurry is sprayed. The building gypsum slurry or the building gypsum and polymer emulsion composite slurry is used as an interface agent, and the slurry is directly brushed after being sprayed, so that the construction is simpler, the construction efficiency is high, the problem that the film forming time of the organic polymer emulsion is difficult to accurately control can be avoided, and the bonding strength of the gypsum-based self-leveling mortar and the concrete base layer can be improved.
Although the interface agent is prepared by adopting the building gypsum cementing material, the interface bonding strength can be obviously improved, but the hydration product dihydrate gypsum of the building gypsum is in direct contact with the concrete base layer, and the dihydrate gypsum and the cement which is not hydrated in the concrete continue to perform hydration reaction with the time, so that delayed ettringite can be generated, the gypsum-based self-leveling mortar terrace can be caused to be hollowed and cracked, and the using effect of the terrace can be seriously reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a gypsum-based self-leveling mortar terrace interface treatment method which has high bonding strength and good bonding quality and can greatly reduce the probability of air holes, hollowing and cracking.
In order to solve the technical problems, the invention adopts the following technical scheme:
a gypsum-based self-leveling mortar floor interface treatment method comprises the step of pouring gypsum-based self-leveling mortar on a concrete floor to serve as a leveling layer or a pavement layer.
In the scheme, the concrete floor mainly refers to a concrete floor, and the concrete floor is a cast-in-place concrete floor or a precast concrete floor of a building which is already constructed; of course, the concrete floor can also be a common concrete floor, such as a factory floor. Taking concrete floor as an example, the interface refers to the interface between a concrete floor slab and gypsum-based self-leveling mortar. The sulphoaluminate cement-based interface agent is an interface treatment material containing rapid hardening sulphoaluminate cement, polymer emulsion, superfine mineral admixture and fine quartz stone, and can form an effective bonding interface based on rapid setting and hardening of the rapid hardening sulphoaluminate cement. By adopting the scheme, before the gypsum-based self-leveling mortar is poured on the surface of the concrete base layer, the sulphoaluminate cement bonding material with specific components is coated as the interface agent, and the bonding strength between the concrete and the interface agent is improved by virtue of the rapid setting and hardening of sulphoaluminate cement and the film formation of polymer emulsion. Meanwhile, the quick-hardening sulphoaluminate cement belongs to low-alkalinity cement, a low-alkalinity transition interface is formed between concrete and the gypsum-based self-leveling mortar, the direct contact between the dihydrate gypsum and the concrete is avoided, meanwhile, the early strength of a bonding interface can be improved through the continuous reaction of the gypsum and the sulphoaluminate cement hydration products, the quality problems of hollowing, cracking and the like of the interface of a concrete base layer and the gypsum-based self-leveling mortar are avoided, and the common quality problems that the existing organic polymer emulsion interface agent and the existing building gypsum interface agent are easy to generate air holes, hollowing and cracking in the engineering application process are effectively solved.
Preferably, the quick-hardening sulphoaluminate cement is a low-alkalinity quick-hardening cementing material with the strength grade of not less than 42.5 grade, the initial setting time of not less than 25min and the final setting time of not more than 180 min. Therefore, the interface bonding strength of the concrete and the gypsum-based self-leveling mortar can be better improved, and a bonding interface can be quickly formed, so that the construction efficiency is improved.
Further, the sulphoaluminate cement-based interface agent comprises a component A and a component B, wherein the component A comprises rapid hardening sulphoaluminate cement, fine quartz sand, superfine mineral admixture, thickening agent, polymer latex powder, hydroxypropyl methyl cellulose ether, defoaming agent and water, and the mass parts of the components are (50 to 75) parts of rapid hardening sulphoaluminate cement and (20 to 50) parts of fine quartz sand: 5-15 parts of superfine mineral admixture: thickener (0.1-0.5) parts: polymer latex powder (0.1-1.0): hydroxypropyl methylcellulose ether (0.02 to 0.05) parts: the component B comprises the following materials in parts by mass, 0.1 to 0.2 part of acrylate emulsion and 0.01 to 0.05 part of defoamer; water may be included as a blending material in an amount such that the remaining materials are mixed to form a fluid. In the composition materials, the sum of the mass of the sulphoaluminate cement, the fine quartz sand and the superfine mineral admixture is 100 parts, and the mixing amount proportion of the other materials is the ratio of the material to the sum of the mass of the three materials. The dosage of the mixing water is 100 to 150 parts.
In the implementation, in the range of the mixture ratio, the concrete mass ratio of the quick-hardening sulphoaluminate cement, the fine quartz sand, the superfine mineral admixture, the thickening agent, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the water can be adjusted according to the compressive strength and the water content of the concrete base layer, and a better concrete mixture ratio can be selected in a concrete test.
When the sulphoaluminate cement-based interface agent is used, the rapid hardening sulphoaluminate cement can rapidly generate strength based on the reaction of calcium aluminate minerals, the 1d compressive strength of the rapid hardening sulphoaluminate cement can exceed 30MPa, and the early bonding strength of the interface agent and a concrete base layer can be obviously improved due to higher early strength, so that the construction efficiency is obviously improved.
The material comprises fine quartz sand and superfine mineral admixture (the specific surface area of the superfine mineral admixture should be not less than 1500 m) 2 /kg) as a filler, the strength, cohesiveness, workability and interface roughness of the interface agent can be adjusted; so that the quartz with larger particles is sprayed during the spraying processThe sand can be more exposed out of the surface layer of the interface agent, so that the interface roughness is improved, and the sand can be better and firmly combined with the gypsum-based self-leveling mortar poured above. The thickening agent in the material is used for adjusting the fluidity and the setting time of the interface agent, improving the cohesiveness of the interface agent and preventing the interface agent from being pulverized after setting and hardening. The polymer emulsion powder in the material is used as a tackifier and a thickening agent, so that the adhesive property of the material can be adjusted, and the interface adhesive strength of the interface agent and a concrete base layer is improved. When in use, the polymer emulsion powder can also gather at the upper layer of the interface agent, so that the bonding strength of the upper layer of the interface agent and the gypsum-based self-leveling mortar above the interface agent is improved. The hydroxypropyl methyl cellulose ether adopted in the material can improve the consistency and the anti-segregation performance of the interface agent, avoid the phenomenon of flowing of the interface agent in the coating process and ensure the uniformity of the coated interface agent. The acrylate emulsion is mainly used for forming a polymer film layer on the surface of the interfacial agent, so that the interfacial bonding strength of the interfacial agent and the gypsum-based self-leveling mortar is improved. The defoaming agent is mainly used for eliminating bubbles generated in the mixing process of the interfacial agent and improving the strength of the interfacial agent and the bonding strength of the interfacial agent with a concrete base layer and gypsum-based self-leveling mortar.
Therefore, the sulphoaluminate cement-based interfacial agent prepared by adopting the material proportion has the characteristics of simple components, good cohesiveness and easy preparation, and also has higher early strength and good volume stability. Therefore, the adhesive bonding between the concrete base layer and the gypsum-based self-leveling mortar can be enhanced, and the hydration product dihydrate gypsum of the gypsum-based self-leveling mortar can be prevented from directly contacting with the concrete to generate destructive expansion reaction, so that the long-term service performance of the gypsum-based self-leveling mortar terrace is obviously improved, and the adhesive bonding is very suitable for the rapid treatment of the base layer concrete of the gypsum-based self-leveling mortar terrace.
Preferably, in the material proportion, the specific surface area of the quick-hardening sulphoaluminate cement used for preparing the sulphoaluminate cement-based interface agent is 350 to 450 m 2 Per kg, strength grade is not lower than 42.5.
Further, as the ultra-fine mineral admixture for the thickening component, it is preferable to use silica fume and/or ultra-fine ground calcium carbonate; wherein the silica fume and/or the ultra-fine heavy matterThe mass of the calcium carbonate is 5 to 15 parts, and the specific surface area of the silica fume is not less than 15000 m 2 Per kg, the specific surface area of the superfine heavy calcium carbonate should be not less than 1500 m 2 (iv) kg. The function of the superfine mineral admixture is to improve the rheological property of the sulphoaluminate cement-based interface agent and enhance the cohesiveness thereof. The superfine mineral admixture defined by the parameters can better achieve the interface enhancement effect.
Furthermore, the fine quartz sand is used as a component for enhancing and improving the surface roughness, and the particle size of the fine quartz sand is 0.6 to 2.0 mm.
Further, the thickener is lignin fiber. The lignin fiber has the functions of thickening and water retention, can obviously improve the consistency of the interfacial agent and the water retention of the interfacial agent, and prevents the interfacial agent from generating cracks in the condensation and hardening process.
Further, the polymer latex powder adopts vinyl acetate-ethylene copolymer. The vinyl acetate-ethylene copolymer has good dispersibility in mixing water, can obviously improve the interface bonding strength of the interface agent and the base concrete and gypsum-based self-leveling mortar, and can also improve the cohesiveness of the slurry of the interface agent.
Further, the hydroxypropyl methyl cellulose ether has a viscosity unit of 4000 to 10000 mPas. Can better play the roles of regulating the consistency and preventing the interface agent from flowing.
Further, the acrylate emulsion mainly adopts water-soluble acrylate emulsion. The function is to form a polymer film layer on the surface of the interfacial agent and improve the bonding strength of the interfacial agent and the gypsum-based self-leveling mortar.
Further, the defoaming agent mainly adopts tributyl phosphate and/or polydimethylsiloxane. The function is to reduce the surface tension of the slurry, so as to quickly eliminate the bubbles in the interfacial agent slurry and inhibit the generation of the bubbles in the slurry.
Further, the application method of the sulphoaluminate cement-based interface agent comprises the following steps: a, weighing dry powder raw materials of the component A according to the proportion requirement, uniformly stirring the dry powder raw materials, and then adding mixing water to uniformly stir; b, coating and stirring the uniformly mixed A component interface agent on the surface of the concrete substrate; c, mixing the defoaming agent of the component B and the acrylic ester emulsion, and adding water for dilution, wherein the dilution ratio is 20 times; and d, before the initial setting of the component A interface agent to be coated, spraying the diluted defoaming agent and the acrylic ester emulsion solution by using a sprayer.
Therefore, the surface treatment effect of the concrete substrate can be better ensured by adopting the steps. In each step, the sulphoaluminate cement-based interface agent is sprayed or coated, so that the interface bonding strength between the gypsum-based self-leveling mortar and the concrete base layer can be improved, and destructive expansion caused by delayed ettringite expansion reaction between dihydrate gypsum and unhydrated cement particles in the concrete base layer can be avoided; and finally, coating the acrylic ester polymer emulsion to finally form a surface with controllable roughness and a closed surface, thereby obviously improving the interface bonding strength between the sulphoaluminate cement-based interface agent and the concrete base layer and also improving the interface bonding strength between the gypsum-based self-leveling mortar and the concrete base layer.
And (b) optimally, when the component A material is mixed and brushed in the step (a), firstly adding dry powder raw materials except water in the brushing material into a mortar stirrer to be uniformly stirred (the stirring time of the high-speed stirrer can be 30-60 seconds, the rotating speed of the stirrer is more than 1600 r/min, and the output power is 2-3 kW), then adding mixing water in a corresponding proportion to be continuously uniformly stirred (the stirring time of the high-speed stirrer can be 120-180 seconds), and obtaining a mixture. The mixture of the sulphoaluminate cement-based interface agent is prepared on the construction site, is uniformly mixed firstly, and is added with mixing water, so that the hydration reaction is prevented from being generated too early, and the preparation method is convenient and rapid, and is beneficial to construction.
In the step a, the mixing time of the dry powder is not less than 30s, so that the dry mixed material is uniformly stirred; and b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, then coating the mixture on the surface of the concrete floor once, and performing steps c and d after 5-10 minutes of coating.
And c, adding water into the acrylate emulsion and the defoaming agent to dilute by 20 times, and stirring by using a high-speed stirrer for 30 to 60s to uniformly disperse the acrylate emulsion in the water.
And d, optimally, adding water into the acrylate emulsion and the defoaming agent to dilute by 20 times, uniformly stirring, and spraying the mixture on the surface of the interface agent which is uniformly coated and not initially solidified by using a sprayer.
Thus, the adhesive strength of the interface agent can be improved. Furthermore, the thickness of the adhesive layer of the sulphoaluminate cement-based interface agent on the surface of the concrete base layer is 1.0-3.0 mm, so that the adhesive effect can be better ensured.
Therefore, the principle of the interface agent construction steps is as follows: and b, coating the interface agent on the surface of the concrete floor to play a role of quick bonding, so that a low-alkalinity bonding layer is formed on the surface of the concrete floor, and a bonding layer with controllable roughness is formed on the surface of the concrete floor. And d, eliminating bubbles on the surface of the interface agent slurry by using the defoaming property of the defoaming agent, improving the compactness of the interface agent, and forming a polymer film layer on the surface of the interface agent by using the film forming property of the acrylate emulsion, so that the interface bonding strength of the interface agent and the gypsum-based self-leveling mortar is improved. Therefore, the invention actually discloses a sulphoaluminate cement-based interface agent for surface treatment of a concrete substrate and a use method thereof, which are used between the concrete ground and the gypsum-based self-leveling mortar, can greatly improve the bonding performance of the concrete ground and the gypsum-based self-leveling mortar, and simultaneously prevent the expansion damage caused by the reaction of cement in the concrete and dihydrate gypsum.
After the technical scheme is adopted, the invention has the advantages that: (1) The surface treatment of the concrete floor is combined with the construction process of the gypsum-based self-leveling mortar pavement layer, so that the construction process is simplified and the construction progress is accelerated; (2) By improving the roughness of the surface of the concrete floor slab, the interface bonding strength between the gypsum-based self-leveling mortar and the concrete floor slab is obviously improved; (3) The surface treatment process and the construction measure of the concrete floor are simplified, the bonding strength between the gypsum-based self-leveling mortar and the concrete floor is obviously improved, and therefore the rapid construction of a gypsum-based self-leveling mortar system is realized.
The method is simple to operate, and by adopting the method to treat the surface of the concrete floor, the 1d positive tensile bonding strength between the sulphoaluminate cement-based interface agent and the concrete floor can reach more than 2.0 MPa, so that the good bonding performance between the gypsum-based self-leveling mortar and the concrete floor is ensured, and the expansibility damage caused by the delayed ettringite generated by the reaction after the concrete is directly contacted with the dihydrate gypsum is also avoided.
The invention also discloses a gypsum-based self-leveling mortar terrace construction method, gypsum-based self-leveling mortar is poured on the concrete ground to be used as a leveling layer or a pavement layer, and the interface treatment method is adopted to carry out interface treatment between the concrete ground and the leveling layer or the pavement layer formed by the gypsum-based self-leveling mortar; then carrying out surface treatment; the surface treatment process comprises the steps of after pouring the gypsum-based self-leveling mortar, coating a layer of mixture of a sulphoaluminate curing agent on the surface of the gypsum-based self-leveling mortar before initial setting and hardening of the gypsum-based self-leveling mortar, wherein the sulphoaluminate curing agent adopts a sulphoaluminate gelled material as a bonding material; the sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether (HPMC), a defoaming agent, a dispersing agent and mixing water.
After pouring gypsum-based self-leveling mortar, spraying a layer of sulphoaluminate cement clinker bonding material with specific components as a curing agent by means of sulphoaluminate cement clinker and C 12 A 7 And the quick setting and hardening reaction between the gypsum powder and the dihydrate gypsum, so that the surface of the gypsum-based self-leveling mortar terrace is quickly cured, and the surface compressive strength and hardness of the gypsum-based self-leveling mortar terrace are improved. Meanwhile, the interface agent material contains wear-resistant components such as waste ceramic powder, quartz sand and the like, so that the hardness of the surface of the gypsum-based self-leveling mortar terrace can be obviously improved, and the aim of improving the wear resistance of the surface of the gypsum-based self-leveling mortar terrace is fulfilled. Because the curing agent is firmly bonded and consolidated with the gypsum-based self-leveling mortar into a whole in the process of setting and hardening, the bonding strength and integrity between the gypsum-based self-leveling mortar terrace and the curing agent are greatly improved, and interlayer peeling or hollowing between the sealing layer and the gypsum-based self-leveling mortar terrace is prevented. Meanwhile, slag powder is doped in the curing agent, and the slag powder can form a waterproof solid sealing layer on the surface of the gypsum-based self-leveling mortar after being continuously hydrated under the alkaline condition, so that the waterproof performance of the gypsum-based self-leveling mortar floor is improvedAnd moisture resistance. Meanwhile, the continuous reaction of the dihydrate gypsum and the sulphoaluminate cement clinker can also improve the early strength of the sealing layer, avoid delaying the subsequent procedures caused by the lower early strength of the gypsum-based self-leveling mortar terrace, effectively solve the problems of low compressive strength, poor wear resistance and poor water resistance of the surface layer of the gypsum-based self-leveling mortar terrace, obviously improve the construction efficiency of the gypsum-based self-leveling mortar, and prevent the gypsum-based self-leveling mortar terrace from having common quality problems such as cracking.
Preferably, the sulphoaluminate cement clinker is anhydrous calcium sulphoaluminate and dicalcium silicate (2 CaO. SiO) obtained by using bauxite, limestone and the like as raw materials and calcining the raw materials to be completely or partially melted 2 ) And calcium aluminoferrite as the main mineral component.
Further, in the sulphoaluminate cement clinker curing agent, the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder, the quartz sand, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the water are mixed according to the mass part ratio range, wherein the sulphoaluminate cement clinker comprises (10) - (25) parts of the ash calcium powder (3) - (5): slag powder (10 to 15) portions: 25-40 parts of waste ceramic powder: quartz sand (30 to 45) parts: polymer latex powder (0.1 to 0.5): hydroxypropyl methylcellulose ether (0.01 to 0.05) parts: defoaming agent (0.01 to 0.05) portion: 0.1 to 0.3 portion of dispersant and 20 to 30 portions of curing agent are mixed with water to satisfy the wetting of the dry mixture. Because bleeding often appears on the surface of the gypsum-based self-leveling mortar, the curing agent only needs to be mixed with a small amount of mixing water, even without mixing water, and the bleeding on the surface of the gypsum-based self-leveling mortar is fully utilized to meet the requirement of the curing agent on the hydration water consumption. In the composition materials, the mass sum of the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder and the quartz sand is 100, and the mixing proportion of the other materials is the ratio of the material to the mass sum of the 5 materials.
When the sulphoaluminate cement clinker curing agent is used, the sulphoaluminate cement clinker can rapidly generate strength based on the reaction between the calcium aluminate mineral and dihydrate gypsum (hydration product of gypsum-based self-leveling mortar), and the 1d compressive strength of the sulphoaluminate cement clinker curing agent can exceed 20MPa. The curing agent has higher early strength, and can obviously improve the surface compressive strength and the wear resistance of the gypsum-based self-leveling mortar terrace, thereby obviously improving the application effect of the gypsum-based self-leveling mortar terrace and avoiding the phenomena of hollowing, cracking and pulverization of the gypsum-based self-leveling mortar terrace.
The sierozem powder in the curing agent can play a role in adjusting the setting time and the early strength of the curing agent. By utilizing the principle that a large amount of calcium hydroxide is generated after the ash calcium is contacted with water, the setting and hardening time of the curing layer is adjusted, so that the curing time of the curing agent is matched with the final setting time of the gypsum-based self-leveling mortar, and the phenomena that the curing layer is completely set and hardened and has high strength, but the gypsum-based self-leveling mortar is not finally set and has no strength are avoided.
Slag powder in the curing agent can participate in the hydration reaction of the curing agent, the hydration reaction degree of the curing agent is improved, and meanwhile, the compressive strength and the water resistance of the curing layer can also be improved, so that the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace are obviously improved, and the mechanical property of the gypsum-based self-leveling mortar terrace is prevented from being gradually deteriorated in a humid environment.
The waste ceramic powder and the quartz sand in the curing agent mainly play a role in improving the strength and the wear resistance of the cured layer; in the curing agent spraying process, the quartz sand with large particles and the waste ceramic powder with good wear resistance can obviously improve the wear resistance of the cured layer, simultaneously improve the compressive strength of the cured layer and reduce the drying shrinkage of the cured layer, so that the gypsum-based self-leveling mortar terrace has good wear resistance and crack resistance.
The polymer latex powder in the curing agent mainly plays a role in improving the bonding strength of the curing agent and the gypsum-based self-leveling mortar terrace, so that the cured layer is better firmly combined with the gypsum-based self-leveling mortar terrace to form a good whole. The hydroxypropyl methyl cellulose ether mainly plays roles in thickening and tackifying, avoids layering and segregation of the curing agent when the gypsum-based self-leveling mortar bleeds, avoids the phenomenon of flowing of the curing agent in the spraying process, and simultaneously ensures the uniformity of the curing agent when meeting water after spraying. The defoaming agent has the effects of eliminating bubbles generated when the curing agent meets water, improving the strength and compactness of the cured layer and obviously eliminating pores on the surface of the gypsum-based self-leveling mortar terrace, thereby improving the apparent quality of the gypsum-based self-leveling mortar terrace. The dispersant has the function of avoiding agglomeration of the curing agent powder after meeting water, which leads to the reduction of the uniformity of the cured layer.
Therefore, the sulphoaluminate cement clinker curing agent prepared according to the proportion has the characteristics of simple components, easiness in preparation, high strength of the cured layer, good wear resistance, higher early strength and good crack resistance. The gypsum-based self-leveling mortar terrace has the advantages that the problems of bleeding and surface layer powdering of the gypsum-based self-leveling mortar can be effectively solved, the compressive strength, the wear resistance and the water resistance of the gypsum-based self-leveling mortar terrace can be remarkably improved, and meanwhile, the surface of the gypsum-based self-leveling mortar terrace can be prevented from cracking, so that the long-term service performance of the gypsum-based self-leveling mortar terrace is remarkably improved, and the gypsum-based self-leveling mortar terrace is very suitable for rapid surface treatment of the gypsum-based self-leveling mortar terrace.
Preferably, among the above materials, the sulphoaluminate cement clinker Al 2 O 3 The content is not less than 24 percent, the residue of a sieve with the size of 45 mu m is not more than 25 percent, and the 3d compressive strength is not less than 45.0 MPa. The sulphoaluminate cement clinker can react with the dihydrate gypsum and the slag quickly, thereby ensuring the curing effect of the curing agent.
Further, the main component of the sierozem powder in the curing agent is Ca (OH) 2 CaO and a small amount of CaCO 3 The mixture of (1) is a finished product of lime, wherein the content of CaO and MgO in the lime powder is not less than 60%, and the fineness is more than 325 meshes. The sierozem powder can play a role in adjusting the setting time and the early strength of the curing agent. By utilizing the principle that a large amount of calcium hydroxide is generated after the ash calcium is contacted with water, the setting and hardening time of the curing layer is adjusted, so that the curing time of the curing agent is matched with the final setting time of the gypsum-based self-leveling mortar, and the phenomena that the curing layer is completely set and hardened and has high strength, but the gypsum-based self-leveling mortar is not finally set and has no strength are avoided.
Furthermore, the slag powder in the curing agent is prepared by taking granulated blast furnace slag (slag powder for short) as a main raw material and adding a small amount of gypsum and grinding the slag powder into a certain finenessThe specific surface area of the slag powder is not less than 300 m 2 The grade is not lower than S75 grade/kg. By utilizing the characteristic of high hydration activity of the slag powder, the slag powder is hydrated to generate hydrated calcium carbonate in an alkaline environment, so that the water resistance of a cured layer can be obviously improved, and the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace are improved.
Further, the waste ceramic powder in the curing agent refers to ceramic waste generated in the ceramic production process, and can also be recycled ceramic, and the waste ceramic powder is prepared by grinding, is a silicon-aluminum material, has good wear resistance and high temperature resistance, and has an average particle size of 200 meshes. The waste ceramic powder is added into the curing agent, so that the wear resistance of the solid sealing layer can be obviously improved, and the solid sealing layer has higher glossiness.
Furthermore, the quartz sand in the curing agent is SiO 2 The fine aggregate is mainly composed of fine aggregates with the grain diameter of 0.6 to 1.18 mm. The curing agent is doped with the quartz sand, so that the drying shrinkage and the preparation cost of the solid seal layer can be reduced, and the compressive strength and the wear resistance of the solid seal layer can be improved, so that the compressive strength and the wear resistance of the gypsum-based self-leveling mortar terrace are obviously improved.
Furthermore, the polymer latex powder in the curing agent adopts vinyl acetate-ethylene copolymer. The vinyl acetate-ethylene copolymer ensures that the mixture has good cohesiveness, can obviously improve the interface bonding strength of the curing agent and the gypsum-based self-leveling mortar base layer, and can also improve the cohesiveness and consistency of the curing agent.
Further, the hydroxypropyl methylcellulose ether in the curing agent has a viscosity unit of 10000 to 50000 mPas. Can better adjust the consistency of the curing agent.
Further, the defoaming agent in the curing agent mainly adopts tributyl phosphate and/or polydimethylsiloxane. The method has the effects of eliminating bubbles on the surface of the gypsum-based self-leveling mortar, avoiding bubbles generated after a curing agent meets water, and achieving the purposes of quickly eliminating bubbles in the gypsum-based self-leveling mortar and inhibiting bubbles generated after a curing agent mixture meets water.
Further, the dispersant in the curing agent is mainly polycarboxylate or sulfamate. The function is to improve the dispersibility of the powder in the curing agent and ensure that the curing agent can be more uniformly distributed after meeting water.
Further, the application method and process of the sulphoaluminate cement clinker curing agent comprise the following steps: a, weighing dry powder raw materials according to the proportion requirement, uniformly stirring the dry powder raw materials, adding mixing water, uniformly stirring, and injecting into a spraying pump bin; b, spraying the slurry on the surface of the gypsum-based self-leveling mortar floor which is not solidified and hardened; c, rolling and flattening the curing agent by using a plastic roller; d, after the curing agent is finally set, polishing and flattening the surface by using a floor polishing machine.
By adopting the steps, the surface treatment effect of the gypsum-based self-leveling mortar terrace can be better ensured. In each step, the sulphoaluminate cement clinker curing agent is sprayed or brushed, so that the compressive strength, hardness and wear resistance of the surface layer of the gypsum-based self-leveling mortar can be improved, and the problems of bleeding, more pores and poor wear resistance of the surface of the gypsum-based self-leveling mortar can be solved.
And (b) optimally, when the curing agent raw materials are mixed in the step (a), firstly, adding dry powder raw materials except water in the curing agent raw materials into a mortar stirrer to stir at a slow speed (the stirring time of the slow stirrer can be 60 to 90 seconds, the rotating speed of the stirrer is more than 60 r/min, and the output power is 3 kW), adding the mixing water with a corresponding proportion to stir uniformly, and continuously stirring uniformly (the stirring time of the slow stirrer can be 120 to 180 seconds) to obtain a mixture. The mixture of the sulphoaluminate cement clinker interface agent is prepared on the construction site, the dry powder is firstly mixed uniformly and then is added with the mixing water, so that the hydration reaction is prevented from generating too early, and the preparation method is convenient and rapid and is beneficial to construction.
In the step a, the mixing time of the dry powder is not less than 60s, so that the dry mixed material is uniformly stirred; b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, pouring into a spraying pump bin, spraying the mixture on the surface of the gypsum-based self-leveling mortar which is not solidified and hardened, spraying once, and performing the step c after 5-10 minutes of spraying is finished; and d is carried out after 3 hours after the step c is finished.
In the step c, a plastic roller can be adopted to slightly roll the curing agent mixture to enable the curing agent mixture to be smooth and improve the compactness of the sealing layer.
And d, polishing and flattening the sealing layer by using a floor polishing machine after the curing agent is finally set, so as to improve the flatness of the floor.
Therefore, the gypsum-based self-leveling mortar terrace with smooth surface, high surface layer compressive strength, good wear resistance and good glossiness can be obtained. Furthermore, the thickness of the sealing layer of the sulphoaluminate cement clinker curing agent on the surface of the gypsum-based self-leveling mortar terrace is 3.0-5.0 mm, so that the curing effect can be better ensured, and the compressive strength and the wear resistance of the sealing layer can be improved.
Therefore, the principle of the curing agent is as follows: and b, spraying the uniformly mixed curing agent on the surface of the gypsum-based self-leveling mortar to perform a rapid curing effect, so that a sealing layer with higher compressive strength and good wear resistance is formed on the surface of the gypsum-based self-leveling mortar, and a sealing layer with better water resistance is formed on the surface of the gypsum-based self-leveling mortar terrace. And c, rolling the sprayed curing agent mixture by using a plastic roller, wherein the curing agent mixture is more compact, is more closely contacted with the surface of the gypsum-based self-leveling mortar, and better absorbs free water on the surface, simultaneously eliminates bubbles on the surface of the curing agent mixture and the gypsum-based self-leveling mortar by using the defoaming characteristic of a defoaming agent, improves the compactness of the curing agent, and simultaneously forms a polymer film layer with certain bonding property in the solid sealing layer by using the film forming characteristic of the polymer emulsion, so that the interface bonding strength of the solid sealing layer and the gypsum-based self-leveling mortar is improved, and the solid sealing layer and the gypsum-based self-leveling mortar form a good whole. And d, removing floating dust and loosely bonded particles on the surface of the floor by using a floor polisher so as to ensure the flatness and the wear resistance of the gypsum-based self-leveling mortar floor. The invention actually discloses the composition of the sulphoaluminate cement clinker curing agent for the surface treatment of the gypsum-based self-leveling mortar terrace and the use method thereof, the sulphoaluminate cement clinker curing agent for the surface treatment of the gypsum-based self-leveling mortar terrace can greatly improve the comprehensive use performances of the gypsum-based self-leveling mortar terrace, including water resistance, compressive strength, crack resistance, wear resistance and the like, and simultaneously solves the problems of surface bleeding and more pores of the gypsum-based self-leveling mortar.
In conclusion, the sulphoaluminate cement-based interface agent is adopted to treat the concrete floor, and the interface bonding strength between the concrete base layer and the gypsum-based self-leveling mortar is improved through the rapid hydration of the sulphoaluminate interface agent, so that the interface bonding strength between the gypsum-based self-leveling mortar and the concrete floor is obviously improved, the rapid construction of the gypsum-based self-leveling mortar floor is realized, and the technical guarantee is provided for the long-term safe use of the gypsum-based self-leveling mortar floor. The method is simple and convenient in integral operation and construction, can improve the interface bonding strength between the gypsum-based self-leveling mortar and the concrete floor, and avoids expansive damage caused by the fact that the dihydrate gypsum of the hydration product of the gypsum-based self-leveling mortar is not in direct contact with the base layer concrete and reacts to generate delayed ettringite after the concrete is in direct contact with the dihydrate gypsum.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The specific implementation mode is as follows:
a gypsum-based self-leveling mortar floor interface treatment method is characterized in that before gypsum-based self-leveling mortar is poured, a sulphoaluminate cement-based interface agent is coated on the surface of the concrete floor, and the sulphoaluminate cement-based interface agent adopts fast-hardening sulphoaluminate cement as a bonding material.
In the scheme, the concrete floor mainly refers to a concrete floor, and the concrete floor is a cast-in-place concrete floor or a precast concrete floor of which the construction of the building is finished; of course, the concrete floor can also be a common concrete floor, such as a factory floor. Taking concrete floor as an example, the interface refers to the interface between the concrete floor and the gypsum-based self-leveling mortar. The sulphoaluminate cement-based binding material is an interface binding agent which contains sulphoaluminate cement and high molecular polymer and can rapidly generate strength based on rapid hydration of the sulphoaluminate cement. By adopting the scheme, before the gypsum-based self-leveling mortar is poured on the surface of the concrete floor, a layer of sulphoaluminate cement-based bonding material with specific components is coated as an interface agent. The sulphoaluminate cement can become an isolation layer between concrete and the gypsum-based self-leveling mortar, the expansive damage caused by delayed ettringite generated by reaction after the concrete is directly contacted with the dihydrate gypsum is prevented, meanwhile, the gypsum reacts with the sulphoaluminate cement to generate ettringite, and the ettringite can permeate into a concrete interface, so that the interface bonding strength between the concrete floor and the gypsum-based self-leveling mortar is obviously improved, and the long-term performance of the gypsum-based self-leveling mortar is greatly improved.
In implementation, the gypsum-based self-leveling mortar refers to gypsum-based self-leveling mortar with absolute dry compressive strength of not less than 20MPa and absolute dry flexural strength of less than 7.5 MPa.
Wherein the quick-hardening sulphoaluminate cement is a low-alkalinity quick-hardening cementing material with the strength grade not lower than 42.5 grade, the initial setting time not less than 25min and the final setting time not more than 180 min. Therefore, the interface bonding strength of the concrete and the gypsum-based self-leveling mortar can be better improved, and a bonding interface can be quickly formed, so that the construction efficiency is improved.
The sulphoaluminate cement-based interface agent comprises a component A and a component B, wherein the component A comprises rapid hardening sulphoaluminate cement, fine quartz sand, an ultrafine mineral admixture, a thickening agent, polymer latex powder, hydroxypropyl methyl cellulose ether, a defoaming agent and water, and the mass parts of the components are (50 to 75) parts of the rapid hardening sulphoaluminate cement and (20 to 50) parts of the fine quartz sand: 5-15 parts of superfine mineral admixture: thickener (0.1-0.5) part: polymer latex powder (0.1-1.0): hydroxypropyl methylcellulose ether (0.02 to 0.05) parts: the component B comprises the following materials in parts by mass, 0.1 to 0.2 part of acrylate emulsion and 0.01 to 0.05 part of defoamer; water is used as the blending material in an amount such that the remaining materials are mixed to form a fluid. In the composition materials, the sum of the mass of the sulphoaluminate cement, the fine quartz sand and the superfine mineral admixture is 100 parts, and the mixing amount proportion of the other materials is the ratio of the material to the sum of the mass of the three materials. The dosage of the mixing water is 100 to 150 parts.
In the implementation, in the range of the mixture ratio, the concrete mass ratio of the quick-hardening sulphoaluminate cement, the fine quartz sand, the superfine mineral admixture, the thickening agent, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the water can be adjusted according to the compressive strength and the water content of the concrete base layer, and a better concrete mixture ratio can be selected in a concrete test.
When the sulphoaluminate cement-based interface agent is used, the rapid hardening sulphoaluminate cement can rapidly generate strength based on the reaction of calcium aluminate minerals, the 1d compressive strength of the rapid hardening sulphoaluminate cement can exceed 30MPa, and the early bonding strength between the interface agent and a concrete base layer can be obviously improved due to higher early strength, so that the construction efficiency is obviously improved.
The material comprises fine quartz sand and superfine mineral admixture (the specific surface area of the superfine mineral admixture should be not less than 1500 m) 2 /kg) as a filler, the strength, cohesiveness, workability and interface roughness of the interface agent can be adjusted; in the spraying process, the quartz sand with larger particles can be more exposed out of the surface layer of the interface agent, so that the interface roughness is improved, and the quartz sand can be better and firmly combined with the gypsum-based self-leveling mortar poured above. The thickening agent in the material is used for adjusting the fluidity and the setting time of the interface agent, improving the cohesiveness of the interface agent and preventing the interface agent from being pulverized after setting and hardening. The polymer emulsion powder in the material is used as a tackifier and a thickening agent, so that the adhesive property of the material can be adjusted, and the interface adhesive strength of the interface agent and a concrete base layer is improved. When in use, the polymer emulsion powder can also gather at the upper layer of the interface agent, so that the bonding strength of the upper layer of the interface agent and the gypsum-based self-leveling mortar above the interface agent is improved. The hydroxypropyl methyl cellulose ether adopted in the material can improve the consistency and the segregation resistance of the interface agent, avoid the phenomenon of flowing of the interface agent in the coating process and ensure the uniformity of the coated interface agent. The acrylate emulsion mainly forms a polymer film layer on the surface of the interfacial agent, and improves the interfacial bonding strength of the interfacial agent and the gypsum-based self-leveling mortar. The defoaming agent is mainly used for eliminating bubbles generated in the mixing process of the interfacial agentAnd the strength of the interface agent and the bonding strength of the interface agent with a concrete base layer and gypsum-based self-leveling mortar are improved.
Therefore, the sulphoaluminate cement-based interface agent prepared by adopting the material proportion has the characteristics of simple components, good cohesiveness and easiness in preparation, and also has high early strength and good volume stability. Therefore, the adhesive can not only strengthen the bonding between the concrete base layer and the gypsum-based self-leveling mortar, but also prevent the hydration product dihydrate gypsum of the gypsum-based self-leveling mortar from directly contacting with the concrete to generate destructive expansion reaction, thereby obviously improving the long-term service performance of the gypsum-based self-leveling mortar terrace and being very suitable for the rapid treatment of the base layer concrete of the gypsum-based self-leveling mortar terrace.
In the material proportion, the specific surface area of the quick-hardening sulphoaluminate cement used for preparing the sulphoaluminate cement-based interface agent is 350-450 m 2 Per kg, strength grade is not lower than 42.5.
Wherein, the superfine mineral admixture used as the thickening component filler preferably adopts silica fume and/or superfine ground calcium carbonate; wherein the mass of the silica fume and/or the superfine heavy calcium carbonate is 5 to 15 parts, and the specific surface area of the silica fume is not less than 15000 m 2 Per kg, the specific surface area of the superfine heavy calcium carbonate should be not less than 1500 m 2 (iv) kg. The function of the superfine mineral admixture is to improve the rheological property of the sulphoaluminate cement-based interface agent and enhance the cohesiveness thereof. The interface strengthening effect can be better achieved by adopting the ultrafine mineral admixture defined by the parameters.
Wherein the fine quartz sand is used as a component for enhancing and improving the surface roughness, and the particle size of the fine quartz sand is 0.6-2.0 mm. The gradation of the fine quartz sand is 50% according to 0.6-1.0 mm, and 50% according to 1.0-2.0 mm. The effect is improved better.
Wherein the thickener is lignin fiber. The lignin fiber has the functions of thickening and water retention, can obviously improve the consistency of the interfacial agent and the water retention of the interfacial agent, and prevents the interfacial agent from generating cracks in the condensation and hardening process.
Wherein the polymer latex powder adopts vinyl acetate-ethylene copolymer; namely vinyl acetate and ethylene copolymerized glue powder, the solid content is not less than 98 percent, and the pH value is 6 to 8. The adhesive property of the interface agent can be better improved, so that the interface agent and the gypsum-based self-leveling mortar terrace and the concrete base layer are ensured to have good adhesive strength. Meanwhile, the cohesiveness of the interface agent slurry can be improved.
Wherein the unit of viscosity of the hydroxypropyl methyl cellulose ether is 4000 to 10000 mPa & s. Can better play the roles of regulating the consistency and preventing the interface agent from flowing.
Wherein, the acrylic ester emulsion mainly adopts water-soluble acrylic ester emulsion. The function is to form a polymer film layer on the surface of the interfacial agent and improve the bonding strength of the interfacial agent and the gypsum-based self-leveling mortar.
Wherein the defoaming agent mainly adopts tributyl phosphate and/or polydimethylsiloxane. The function is to reduce the surface tension of the slurry, so as to quickly eliminate the bubbles in the interfacial agent slurry and inhibit the generation of the bubbles in the slurry.
In specific implementation, the application method and process of the sulphoaluminate cement-based interface agent comprise the following steps: a, weighing dry powder raw materials of the component A according to the proportion requirement, uniformly stirring the dry powder raw materials, and then adding mixing water to uniformly stir; b, coating and stirring the uniformly mixed A component interface agent on the surface of the concrete substrate; c, mixing the defoaming agent of the component B and the acrylic ester emulsion, and adding water for dilution, wherein the dilution ratio is 20 times; d before the painted A component interface agent is initially set, spraying the diluted defoaming agent and the acrylic ester emulsion solution by using a sprayer.
Therefore, the surface treatment effect of the concrete base layer can be better ensured by adopting the steps. In each step, the sulphoaluminate cement-based interface agent is sprayed or brushed, so that the interface bonding strength between the gypsum-based self-leveling mortar and the concrete base layer can be improved, and destructive expansion caused by delayed ettringite expansion reaction between dihydrate gypsum and unhydrated cement particles in the concrete base layer can be avoided; and finally, coating an acrylic ester polymer emulsion to finally form a surface with controllable roughness and a closed surface, thereby obviously improving the interface bonding strength between the sulphoaluminate cement-based interface agent and the concrete base layer and also improving the interface bonding strength between the gypsum-based self-leveling mortar and the concrete base layer.
When the component A material is mixed and brushed in the step a, firstly adding dry powder raw materials except water in the brushing material into a mortar stirrer to be uniformly stirred (the stirring time of the high-speed stirrer can be 30-60 seconds, the rotating speed of the stirrer is more than 1600 r/min, and the output power is 2-3 kW), then adding mixing water in a corresponding proportion to be continuously uniformly stirred (the stirring time of the high-speed stirrer can be 120-180 seconds), and obtaining a mixture. The mixture of the sulphoaluminate cement-based interface agent is prepared on the construction site, is uniformly mixed firstly, and is added with mixing water, so that the hydration reaction is prevented from being generated too early, and the preparation method is convenient and rapid, and is beneficial to construction.
In the step a, the mixing time of the dry powder is not less than 30s, so that the dry mixed material is uniformly stirred; and in the step b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, then brushing the mixture on the surface of the concrete floor for one time, and performing the steps c and d after 5-10 minutes of brushing.
And c, adding water into the acrylate emulsion and the defoaming agent to dilute by 20 times, and stirring by using a high-speed stirrer for 30 to 60s to uniformly disperse the acrylate emulsion in the water.
And d, adding water into the acrylate emulsion and the defoaming agent to dilute by 20 times, uniformly stirring, and spraying the mixture on the surface of the interface agent which is uniformly coated and not initially solidified by using a sprayer.
Thus, the adhesive strength of the interface agent can be improved. Furthermore, the thickness of the adhesive layer of the sulphoaluminate cement-based interface agent on the surface of the concrete base layer is 1.0-3.0 mm, so that the adhesive effect can be better ensured.
Therefore, the principle of the interface agent construction steps is as follows: b, coating the interface agent on the surface of the concrete floor, and firstly performing a quick bonding effect to form a low-alkalinity bonding layer on the surface of the concrete floor and simultaneously form a bonding layer with controllable roughness on the surface of the concrete floor. And d, eliminating bubbles on the surface of the interface agent slurry by using the defoaming property of the defoaming agent, improving the compactness of the interface agent, and forming a polymer film layer on the surface of the interface agent by using the film forming property of the acrylate emulsion, so that the interface bonding strength of the interface agent and the gypsum-based self-leveling mortar is improved. Therefore, the invention actually discloses a sulphoaluminate cement-based interface agent for surface treatment of a concrete substrate and a use method thereof, which are used between the concrete floor and the gypsum-based self-leveling mortar, can greatly improve the bonding performance of the concrete floor and the gypsum-based self-leveling mortar, and simultaneously prevent the expansion damage caused by the reaction of cement in the concrete and dihydrate gypsum.
In specific implementation, on the basis of the scheme, the applicant adopts different material proportions to perform three groups of test examples. In the test example, the concrete slab was used as a target to be tested, and the compounding ratio of the sulphoaluminate cement interface agent was adjusted. The standard value of the compressive strength of the selected concrete slab is not less than 30MPa, which is the common concrete strength grade when the concrete slab is poured at present.
Test example 1, the steps in this test example are the same as in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement interface agent in the embodiment adopts the following materials in parts by weight: 50 parts of sulphoaluminate cement, 35 parts of fine quartz sand: 5 parts of silica fume: 10 parts of heavy calcium carbonate: 0.1 part of lignocellulose: 0.1 part of polymer latex powder (VAE): 0.02 part of hydroxypropyl methyl cellulose ether (HPMC) and 150 parts of mixing water. : the component B comprises 0.1 part of acrylate emulsion and 0.05 part of tributyl phosphate defoamer.
Test example 2, the steps in this test example are the same as those in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement interface agent in the embodiment adopts the following materials in parts by weight: 60 parts of sulphoaluminate cement, 30 parts of fine quartz sand: 5 parts of silica fume: 5 parts of heavy calcium carbonate: 0.3 part of lignocellulose: 0.5 part of polymer latex powder (VAE): 0.03 part of hydroxypropyl methyl cellulose ether (HPMC) and 120 parts of mixing water. The component B comprises 0.1 part of acrylate emulsion and 0.03 part of tributyl phosphate defoamer.
In test example 3, the steps in the test example are the same as those in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement interfacial agent in the embodiment adopts the following materials in parts by weight: 75 parts of sulphoaluminate cement, 20 parts of fine quartz sand: 5 parts of silica fume: 0.5 part of lignocellulose: 1.0 part of polymer latex powder (VAE): 0.05 part of hydroxypropyl methyl cellulose ether (HPMC) and 100 parts of mixing water. The component B comprises 0.2 part of acrylate emulsion and 0.01 part of tributyl phosphate defoamer.
And (3) testing the interface bonding strength between the sulphoaluminate cement interface agent and the concrete slab by adopting a positive pulling bonding test according to the results of the three groups of test examples. Specifically, a fine stone concrete slab of 70mm × 70mm × 20mm was cast, and the concrete strength rating was C30. Pouring a gypsum self-leveling mortar test block of 40mm multiplied by 10mm, wherein the strength grade is D20. And (3) brushing a sulphoaluminate interface agent on the surface of the concrete slab according to the sequence, placing the forming frame on the concrete slab coated with the interface agent after the brushing of the interface agent is finished, and then adhering the gypsum self-leveling mortar test block on the concrete slab coated with the interface agent. After pouring, the test piece is placed in a curing box with the same ambient temperature, and the interface bonding strength of the test piece after the interface agent is coated for 3 hours and 1d is respectively tested by adopting a positive pulling bonding test method according to JGJ/T907-2018 concrete interface treating agent.
The results of the three test examples are shown in the following table.
In addition, as a comparison, when the sulphoaluminate cement interface agent is not coated, the interface bonding strength of the gypsum-based self-leveling mortar and the concrete base layer is only 0.1MPa for 3h, and is only 0.3MPa for 1d. The method is adopted to enhance the interface bonding strength between the gypsum-based self-leveling mortar and the concrete, the rapid construction of a gypsum-based self-leveling mortar pavement layer or leveling layer can be realized, the interface bonding strength can be improved by 2 to 3 times after the construction is finished for 3 hours and 1d, and in addition, no obvious hollowing and peeling phenomena occur between the concrete slab and the gypsum-based self-leveling mortar. The method for pretreating the surface of the concrete floor slab has the advantages that the interface bonding strength of the concrete floor slab and the gypsum-based self-leveling mortar is obviously improved, the bonding is firmer, the rapid construction of a gypsum-based self-leveling mortar pavement layer or a leveling layer can be realized, and meanwhile, the gypsum-based self-leveling mortar can be prevented from hollowing and cracking.
Claims (10)
1. A gypsum-based self-leveling mortar terrace interface treatment method is characterized in that before gypsum-based self-leveling mortar is poured, a sulphoaluminate cement-based interface agent is coated on the surface of a concrete floor, and fast hardening sulphoaluminate cement is adopted as a bonding material for the sulphoaluminate cement-based interface agent.
2. The gypsum-based self-leveling mortar floor interface treatment method according to claim 1, wherein the sulphoaluminate cement-based interface agent comprises a component A and a component B, the component A comprises rapid hardening sulphoaluminate cement, fine quartz sand, superfine mineral admixture, thickening agent, polymer emulsion powder, hydroxypropyl methyl cellulose ether, defoaming agent and water, and the mass ratio of the component A to the component A is (50 to 75) parts of rapid hardening sulphoaluminate cement: 5-15 parts of superfine mineral admixture: thickener (0.1-0.5) part: polymer latex powder (0.1-1.0): hydroxypropyl methylcellulose ether (0.02 to 0.05) parts: the component B comprises the following materials in parts by mass, 0.1 to 0.2 part of acrylate emulsion and 0.01 to 0.05 part of defoaming agent; water may be included as a blending material in an amount such that the remaining materials are mixed to form a fluid.
3. The gypsum-based self-leveling mortar terrace interface treatment method of claim 2, wherein in the material ratio, the specific surface area of the fast hardening sulphoaluminate cement used for preparing the sulphoaluminate cement-based interface agent is 350-450 m 2 Per kg, strength grade is not lower than 42.5.
4. The gypsum-based self-leveling mortar terrace interface treatment method according to claim 2, wherein the ultra-fine mineral admixture as the thickening component employs silica fume and/or ultra-fine ground calcium carbonate; wherein the mass of the silica fume and/or the superfine heavy calcium carbonate is 5 to 15 parts, and the specific surface area of the silica fume is not less than 15000 m 2 Per kg, the specific surface area of the superfine heavy calcium carbonate should be not less than 1500 m 2 /kg。
5. The method for interface treatment of the gypsum-based self-leveling mortar terrace as claimed in claim 2, wherein the fine quartz sand is used as a component for enhancing and improving the surface roughness, and the particle size of the fine quartz sand is 0.6 to 2.0 mm.
6. The gypsum-based self-leveling mortar floor interface treatment method of claim 2, wherein the thickener is lignin fiber.
7. The gypsum-based self-leveling mortar floor interface treatment method of claim 2, wherein the polymer latex powder is vinyl acetate-ethylene copolymer;
the viscosity unit of the hydroxypropyl methyl cellulose ether is 4000 to 10000 mPa & s;
the acrylic ester emulsion is water-soluble acrylic ester emulsion;
the defoaming agent mainly adopts tributyl phosphate and/or polydimethylsiloxane.
8. The gypsum-based self-leveling mortar floor interface treatment method of claim 2, wherein the sulphate aluminum cement-based interface agent is used by a method comprising the following steps: a, weighing dry powder raw materials of the component A according to the proportion requirement, uniformly stirring the dry powder raw materials, and then adding mixing water to uniformly stir; b, coating and stirring the uniformly mixed A component interface agent on the surface of the concrete substrate; c, mixing the defoaming agent of the component B with the acrylate emulsion, and then adding water for dilution, wherein the dilution ratio is 20 times; and d, before the initial setting of the component A interface agent to be coated, spraying the diluted defoaming agent and the acrylic ester emulsion solution by using a sprayer.
9. The gypsum-based self-leveling mortar terrace interface treatment method according to claim 8, wherein when the component A is mixed and brushed in the step a, dry powder raw materials except water in the brushing material are added into a mortar stirrer to be uniformly stirred, and then the mixture is continuously uniformly stirred by adding mixing water in a corresponding proportion to obtain a mixture;
in the step a, the mixing time of the dry powder is not less than 30s, so that the dry mixed material is uniformly stirred; and b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, then coating the mixture on the surface of the concrete floor once, and performing steps c and d after 5-10 minutes of coating.
10. The gypsum-based self-leveling mortar terrace interface treatment method according to claim 8, wherein in the step c, the acrylate emulsion and the defoamer are diluted by 20 times by adding water, and are stirred by a high-speed stirrer for 30 to 60s, so that the acrylate emulsion is uniformly dispersed in the water;
and d, adding water into the acrylate emulsion and the defoaming agent to dilute by 20 times, uniformly stirring, and spraying the mixture on the surface of the interface agent which is uniformly coated and not initially solidified by using a sprayer.
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