CN115353346A - Self-leveling anti-crack mortar and preparation method thereof - Google Patents
Self-leveling anti-crack mortar and preparation method thereof Download PDFInfo
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- CN115353346A CN115353346A CN202210979116.9A CN202210979116A CN115353346A CN 115353346 A CN115353346 A CN 115353346A CN 202210979116 A CN202210979116 A CN 202210979116A CN 115353346 A CN115353346 A CN 115353346A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title abstract description 38
- 229920001971 elastomer Polymers 0.000 claims abstract description 38
- 239000005060 rubber Substances 0.000 claims abstract description 38
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 32
- 239000010440 gypsum Substances 0.000 claims abstract description 32
- -1 polypropylene Polymers 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 25
- 239000004743 Polypropylene Substances 0.000 claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 12
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 9
- 239000013530 defoamer Substances 0.000 claims abstract description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 9
- 102000004169 proteins and genes Human genes 0.000 claims description 8
- 108090000623 proteins and genes Proteins 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 5
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 5
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 5
- 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 5
- 230000008719 thickening Effects 0.000 claims description 5
- 150000004645 aluminates Chemical class 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 13
- 230000008859 change Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000001828 Gelatine Substances 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010016807 Fluid retention Diseases 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides self-leveling anti-crack mortar and a preparation method thereof, wherein the self-leveling anti-crack mortar comprises the following components in parts by weight: 800-900 parts of building gypsum, 50-200 parts of modified cement, 50-100 parts of fly ash, 30-100 parts of rubber particles, 0.5-1.25 parts of polypropylene fiber, 1-3 parts of water reducing agent, 0.5-0.8 part of cellulose ether, 0.5-1.5 parts of retarder, 0.05-0.15 part of dispersible rubber powder and 0.3-1.0 part of defoamer; the invention uses the building gypsum as the main material, thereby ensuring the early strength; by adding the water reducing agent, the defoaming agent and the dispersible rubber powder, the workability and compactness of the mortar are greatly improved; through the synergistic effect between the rubber particles and the polypropylene fibers, the internal stress generated by mortar hardening is reduced, and cracks and deformation of the mortar are prevented.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to self-leveling anti-crack mortar and a preparation method thereof.
Background
The gypsum self-leveling mortar has become a building material product with good development prospect due to the characteristics of good leveling property, high early strength, easy laying, high construction speed, short construction period and the like. It is suitable for public building ground, household floor, etc.
In use, self-levelling mortars always adhere to the ground concrete or mortar material and when there is an inconsistent deformation of the two materials, an interaction occurs which is usually the driving force which causes the hardened mortar to crack. Meanwhile, self-leveling mortar is usually applied in a thin layer form, and the characteristic determines that the behavior of the mortar is easily influenced by the environment. For example: in a dry environment, the mortar is easily dried and shrunk, and when the environmental temperature changes, the mortar is also easily subjected to temperature deformation. This deformation of the mortar bed is generally inconsistent with the substrate and this inconsistency in deformation is a source of internal stress. That is, there is a factor causing cracking in the hardened mortar. Owing to the particularities of the use of self-leveling mortars, cracking is often visible. The cracking problem of the hardened mortar becomes an urgent problem for the technical development of commercial mortar. There are many factors causing cracking, and in the case of a self-leveling cement mortar floor having a thickness of l0mm (hereinafter, simply referred to as a floor), shrinkage stress is the most important factor causing early cracking thereof. As the shrinkage strain increases, the ground is not free to deform due to the ground restraint by the foundation, thereby forming shrinkage stresses distributed along its length. When the shrinkage tensile stress reaches the tensile strength of the mortar, the ground surface is cracked.
There are several types of volume changes in gypsum hydration hardening that chemically shrink drying shrinkage self-shrink temperature shrinkage plastic shrinkage. Therefore, the shrinkage strain of the self-leveling mortar for the ground is controlled, and the cracking risk of the ground is favorably reduced. In addition, geometric parameters such as the thickness and length of the floor also affect the magnitude of the shrinkage stress of the gypsum floor to varying degrees.
CN105669095A discloses a preparation method of waterproof anti-crack mortar, which comprises, by weight, 400-600 parts of cement, 100-200 parts of fly ash, 800-1000 parts of medium sand, 20-30 parts of modifier and 300-400 parts of water, wherein the modifier is one of redispersible latex powder and polymer emulsion, the preparation method of the waterproof anti-crack mortar further comprises 0.1-0.2 part of polypropylene fiber, the preparation method of the waterproof anti-crack mortar further comprises 0.6-1.2 part of wood fiber, and the preparation method of the waterproof anti-crack mortar further comprises 0.2-0.4 part of hydroxypropyl cellulose. By adopting the cement and the fly ash as main raw materials and the polymer emulsion or the redispersible rubber powder as a modifier, the cement and the fly ash are stirred and mixed with the medium sand and water, so that the waterproof performance and the crack resistance of the mortar are improved.
CN113292304A discloses an anti-crack gypsum-based self-leveling mortar and a preparation process thereof, wherein the anti-crack gypsum-based self-leveling mortar comprises the following components in parts by weight: 50-200 parts of ordinary portland cement, 200-350 parts of desulfurized gypsum powder, 30-100 parts of filler, 50-100 parts of sand, 150-250 parts of bauxite powder, 10-25 parts of polyester fiber, 1-3 parts of water reducing agent, 0.5-1.0 part of defoaming agent and 0.5-1.2 parts of retarder, wherein micropores are formed in the polyester fiber. According to the anti-crack gypsum-based self-leveling mortar, a gelling system is formed by the desulfurized gypsum powder and the bauxite powder, so that the flue gas desulfurization waste desulfurized gypsum is directly utilized, resources and energy are saved, the water retention of the fiber can be increased due to the micropores of the polyester fiber, the combination effect of the surface and the mortar is improved, and the anti-crack effect on the mortar is improved.
However, the above method has a limited improvement in crack resistance, and there is still a need to provide a new self-leveling crack-resistant mortar, which further improves crack resistance while ensuring strength.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide self-leveling anti-crack mortar and a preparation method thereof, wherein the self-leveling anti-crack mortar comprises the following components in parts by weight: 800-900 parts of building gypsum, 50-200 parts of modified cement, 50-100 parts of fly ash, 30-100 parts of rubber particles, 0.5-1.25 parts of polypropylene fiber, 1-3 parts of water reducing agent, 0.5-0.8 part of cellulose ether, 0.5-1.5 parts of retarder, 0.05-0.15 part of dispersible rubber powder and 0.3-1.0 part of defoamer; the invention uses the building gypsum as the main material, thereby ensuring the early strength; by adding the water reducing agent, the defoaming agent and the dispersible rubber powder, the workability and compactness of the mortar are greatly improved; through the synergistic effect between the rubber particles and the polypropylene fibers, the internal stress generated by mortar hardening is reduced, and cracks and deformation of the mortar are prevented.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the purposes of the invention is to provide self-leveling anti-crack mortar, which comprises the following components in parts by weight:
the self-leveling anti-crack mortar disclosed by the invention uses the building gypsum as a main material, so that the early strength of the self-leveling anti-crack mortar is ensured; by adding the water reducing agent, the defoaming agent and the dispersible rubber powder, the workability and compactness of the mortar are greatly improved; through the synergistic effect between the rubber particles and the polypropylene fibers, the internal stress generated by mortar hardening is reduced, and cracks and deformation of the mortar are prevented.
It is to be noted that 800 to 900 parts of the building gypsum may be, for example, 800 parts, 810 parts, 820 parts, 830 parts, 840 parts, 850 parts, 860 parts, 870 parts, 880 parts, 890 parts, 900 parts, etc.; 50-200 parts of modified cement, such as 50 parts, 70 parts, 90 parts, 100 parts, 120 parts, 140 parts, 160 parts, 180 parts, 200 parts and the like; 50-100 parts of fly ash, such as 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts, 100 parts and the like; 30-100 parts of rubber particles, such as 30 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts, 90 parts, 100 parts and the like; polypropylene fiber 0.5-1.25 parts, such as 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.25 parts; 1-3 parts of water reducing agent, such as 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts and the like; cellulose ether 0.5-0.8 parts, for example can be 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, 0.8 parts; 0.5 to 1.5 parts of retarder, for example, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts and the like; dispersible gum powder 0.05-0.15 parts, which can be, for example, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, 0.10 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, etc.; 0.3 to 1.0 part of a defoaming agent, and for example, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part, etc.; however, the numerical values are not limited to the enumerated values, and other numerical values not enumerated within the numerical ranges may be similarly applicable.
As a preferable technical scheme of the invention, the building gypsum comprises beta-type semi-hydrated desulfurized gypsum.
Preferably, the modified cement comprises any one of portland cement, aluminate cement, or sulphoaluminate cement, or a combination of at least two of these, typical but non-limiting examples of which include a combination of portland cement and aluminate cement, a combination of portland cement and sulphoaluminate cement, and a combination of aluminate cement and sulphoaluminate cement.
As a preferable technical scheme of the invention, the fly ash comprises primary fly ash or secondary fly ash.
Preferably, the rubber particles have a particle size of 20 to 40 mesh, and may be, for example, 20 mesh, 22 mesh, 24 mesh, 26 mesh, 28 mesh, 30 mesh, 32 mesh, 34 mesh, 36 mesh, 38 mesh, 40 mesh, etc., but not limited to the enumerated values, and other unrecited values within the above-mentioned range of values are also applicable.
In a preferred embodiment of the present invention, the polypropylene fibers have a length of 4 to 8mm, and may be 4mm,4.2mm,4.6mm,5mm,5.4mm,5.8mm,6mm,6.3mm,6.7mm,7mm,7.3mm,7.6mm,8mm, for example, but the polypropylene fibers are not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
As a preferable technical scheme of the invention, the water reducing agent comprises a polycarboxylic acid water reducing agent.
As a preferred embodiment of the present invention, the cellulose ether includes hydroxypropyl methyl cellulose ether.
Preferably, the cellulose ether has a degree of polymerization of from 70000 to 100000, which may be, for example, 70000, 75000, 80000, 85000, 90000, 95000, 100000, etc., but is not limited to the values listed, and other values not listed within the above range of values are equally applicable.
As a preferred embodiment of the present invention, the retarder comprises any one of citric acid, sodium hexametaphosphate or protein-based retarder or a combination of at least two of them, and typical but non-limiting examples of the combination include a combination of citric acid and sodium hexametaphosphate, a combination of citric acid and protein-based retarder, and a combination of sodium hexametaphosphate and protein-based retarder.
As a preferred embodiment of the invention, the dispersible gelatine powder comprises VAE redispersible gelatine powder.
As a preferred technical scheme of the invention, the defoaming agent comprises a silicone defoaming agent.
Preferably, the silicone antifoam agent comprises a dimethylsiloxane and/or a polyether siloxane copolymer.
The invention also aims to provide a preparation method of the self-leveling anti-crack mortar, which comprises the following steps:
putting the building gypsum, the modified cement, the fly ash, the rubber particles, the polypropylene fibers, the water reducing agent, the cellulose ether, the retarder, the dispersible rubber powder and the defoaming agent into a mixer according to the parts by weight, and carrying out first mixing for 20-30min at the rotating speed of 100-200 r/min; and then, adding water according to the standard thickening water demand of gypsum self-leveling anti-crack mortar JC/T1023-2007, and performing second mixing for 15-20min at the rotating speed of 400-600r/min to obtain the self-leveling anti-crack mortar.
It is worth to say that the rotation speed of the first mixing is 100-200r/min, for example, 100r/min,110r/min,120r/min,130r/min,140r/min,150r/min,160r/min,170r/min,180r/min,190r/min,200r/min, etc.; the first mixing time is 20-30min, such as 20min,22min,24min,26min,28min,30min, etc.; the rotation speed of the second mixing is 400-600r/min, such as 400r/min,420r/min,440r/min,460r/min,480r/min,500r/min,520r/min,540r/min,560r/min,580r/min,600r/min, etc.; the second mixing time is 15-20min, and may be, for example, 15min, 111amin, 17min,18min,19min,20min, etc.; however, the numerical values are not limited to the specific ones, and other numerical values not specified in the above numerical ranges are also applicable.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the beneficial effects that:
the self-leveling anti-crack mortar disclosed by the invention uses the building gypsum as a main material, so that the early strength of the self-leveling anti-crack mortar is ensured; by adding the water reducing agent, the defoaming agent and the dispersible rubber powder, the workability and compactness of the mortar are greatly improved; through the synergistic effect between the rubber particles and the polypropylene fibers, the internal stress generated by mortar hardening is reduced, and cracks and deformation of the mortar are prevented.
Detailed Description
The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
It should be noted that in the specific embodiment of the present invention, the type of the desulfurized gypsum is beta type semi-hydrated desulfurized gypsum, which is purchased from Jiangsu Yifu New materials science and technology Co., ltd; portland cement model PO42.5, available from trumpet shell company, anhui; first grade fly ash from scleral materials corporation; the rubber particles were purchased from the Toronto mineral processing plant in Lingshui county; the polycarboxylate superplasticizer is available from western-style card (china) 540P; the protein retarder is of the type of Edman power, and is purchased from Wuanshenghui novel material Co., ltd, handan market; VAE redispersible rubber powder is purchased from Dingjia Fine chemical Co., ltd, jin Zhou.
Example 1
The embodiment provides self-leveling anti-crack mortar and a preparation method thereof, wherein the self-leveling anti-crack mortar comprises the following components in parts by weight:
the preparation method comprises the following steps:
putting desulfurized gypsum, portland cement, fly ash, rubber particles, polypropylene fibers, a polycarboxylic acid water reducing agent, hydroxypropyl methyl cellulose ether, a protein retarder, VAE redispersible rubber powder and dimethyl siloxane into a mixer according to the parts by weight, and carrying out first mixing for 20min at the rotating speed of 200 r/min; and then, adding water according to the standard thickening water demand of gypsum self-leveling anti-crack mortar JC/T1023-2007, and carrying out second mixing for 15min at the rotating speed of 500r/min to obtain the self-leveling anti-crack mortar.
Example 2
The embodiment provides self-leveling anti-crack mortar and a preparation method thereof, wherein the self-leveling anti-crack mortar comprises the following components in parts by weight:
the preparation method comprises the following steps:
putting desulfurized gypsum, portland cement, fly ash, rubber particles, polypropylene fibers, a polycarboxylic acid water reducing agent, hydroxypropyl methyl cellulose ether, a protein retarder, VAE (vinyl acetate) redispersible rubber powder and dimethyl siloxane into a mixer in parts by weight, and performing first mixing for 30min at the rotating speed of 100 r/min; and then, adding water according to the standard thickening water demand of gypsum self-leveling anti-crack mortar JC/T1023-2007, and performing second mixing for 20min at the rotating speed of 400r/min to obtain the self-leveling anti-crack mortar.
Example 3
The embodiment provides self-leveling anti-crack mortar and a preparation method thereof, wherein the self-leveling anti-crack mortar comprises the following components in parts by weight:
the preparation method comprises the following steps:
putting desulfurized gypsum, portland cement, fly ash, rubber particles, polypropylene fibers, a polycarboxylic acid water reducing agent, hydroxypropyl methyl cellulose ether, a protein retarder, VAE redispersible rubber powder and dimethyl siloxane into a mixer according to the parts by weight, and carrying out first mixing for 25min at the rotating speed of 150 r/min; and then, adding water according to the standard thickening water demand of gypsum self-leveling anti-crack mortar JC/T1023-2007, and carrying out second mixing for 16min at the rotating speed of 600r/min to obtain the self-leveling anti-crack mortar.
Example 4
The embodiment provides a self-leveling anti-crack mortar and a preparation method thereof, and the self-leveling anti-crack mortar is different from the self-leveling anti-crack mortar described in embodiment 1 only in that: keeping the total amount of each raw material component unchanged, wherein the rubber particles are 20 parts, and the other components are adjusted according to the original proportion; the preparation method refers to the preparation method of example 1.
Example 5
The embodiment provides a self-leveling anti-crack mortar and a preparation method thereof, and the self-leveling anti-crack mortar is different from the self-leveling anti-crack mortar described in embodiment 1 only in that: keeping the total amount of each raw material component unchanged, wherein the rubber particles are 120 parts, and the other components are adjusted according to the original proportion; the preparation method refers to the preparation method of example 1.
Example 6
The embodiment provides a self-leveling anti-crack mortar and a preparation method thereof, and the self-leveling anti-crack mortar is different from the self-leveling anti-crack mortar described in embodiment 1 only in that: keeping the total amount of the raw material components unchanged, wherein the polypropylene fiber accounts for 0.2 part, and other components are adjusted according to the original proportion; the preparation method refers to the preparation method of example 1.
Example 7
The embodiment provides a self-leveling anti-crack mortar and a preparation method thereof, and the self-leveling anti-crack mortar is different from the self-leveling anti-crack mortar described in embodiment 1 only in that: keeping the total amount of the raw material components unchanged, wherein the polypropylene fiber accounts for 1.5 parts, and the other components are adjusted according to the original proportion; the preparation method refers to the preparation method of example 1.
Comparative example 1
The present comparative example provides a self-leveling anti-crack mortar and a preparation method thereof, the self-leveling anti-crack mortar described in reference to example 1 differs only in that: replacing 30 parts of rubber particles with other raw materials according to the original proportion in an equivalent manner; the preparation method refers to the preparation method of example 1.
Comparative example 2
The present comparative example provides a self-leveling anti-crack mortar and a preparation method thereof, the self-leveling anti-crack mortar described in reference to example 1 differs only in that: 1 part of polypropylene fiber is replaced by other raw materials according to the original proportion and the same amount; the preparation method refers to the preparation method of example 1.
Comparative example 3
The present comparative example provides a self-leveling anti-crack mortar and a preparation method thereof, the self-leveling anti-crack mortar described in reference to example 1 differs only in that: replacing 30 parts of rubber particles and 1 part of polypropylene fibers with other raw materials according to the original proportion in an equivalent manner; the preparation method refers to the preparation method of example 1.
The performance of the self-leveling anti-crack mortar obtained in the above examples and comparative examples after molding is tested, and the test contents and method are as follows:
24h flexural strength, 24h compressive strength, 28D flexural strength, 28D compressive strength, 28D oven dry compressive strength: testing according to GB/T17669.3-1999 standard;
28D rate of change of size: the test is carried out according to the specification standard of 6.8 in JC/T1023-2007;
the results of the above tests are shown in Table 1.
TABLE 1
The following points can be derived from table 1:
(1) As can be seen from the examples 1 to 3, the self-leveling anti-crack mortar has high breaking strength and compressive strength and small 28D size change rate;
(2) Comparing example 1 with examples 4 and 5, the 28D size change rate is increased due to the fact that 20 parts of rubber particles in example 4 are lower than the preferred 30-100 parts of the invention; since the rubber particles in example 5 are 120 parts, more than the preferred 30-100 parts of the invention, the 24h flexural and compressive strength and 28D flexural and compressive strength are reduced;
(3) Comparing example 1 with examples 6 and 7, the polypropylene fiber in example 6 is 0.2 part, which is lower than the preferred 0.5-1.25 part of the invention, resulting in a significant decrease in 24h flexural strength and 28D flexural strength, and an increase in 28D dimensional change rate; because the polypropylene fiber in the embodiment 7 is 1.5 parts, which exceeds the preferable 0.5-1.25 parts of the invention, the improvement of the flexural strength and the compressive strength is small, and the 28D size change rate is increased;
(4) Comparing example 1 with comparative examples 1-3, the 24h compressive strength and 28D flexural and compressive strengths were both reduced and the 28D dimensional change rate was increased due to the absence of rubber particles added to comparative example 1; since comparative example 2 did not add polypropylene fibers, both the 24h compressive strength and the 28D flexural strength were reduced, and the 28D dimensional change rate was increased; the rubber particles and the polypropylene fibers are not added in the comparative example 3, so that the fracture and compression resistance performance is greatly reduced, the size change rate is increased, and the performance of the self-leveling anti-crack mortar obtained in the comparative example 3 is lower than that of the comparative examples 1 and 2.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The self-leveling anti-crack mortar is characterized by comprising the following components in parts by weight:
2. the self-leveling anti-crack mortar of claim 1, wherein the building gypsum comprises beta-hemihydrate desulfurized gypsum;
preferably, the modified cement comprises any one of or a combination of at least two of portland cement, aluminate cement or sulphoaluminate cement.
3. The self-leveling anti-crack mortar of claim 1 or 2, wherein the fly ash comprises a primary fly ash or a secondary fly ash;
preferably, the rubber particles have a particle size of 20 to 40 mesh.
4. The self-leveling crack resistant mortar according to any one of claims 1 to 3, wherein the polypropylene fibers have a length of 4 to 8mm.
5. The self-leveling anti-crack mortar of any one of claims 1 to 4, wherein the water reducer comprises a polycarboxylic acid water reducer.
6. The self-leveling crack-resistant mortar of any one of claims 1-5, wherein the cellulose ether comprises a hydroxypropyl methyl cellulose ether;
preferably, the degree of polymerization of the cellulose ether is 70000 to 100000.
7. The self-leveling anti-crack mortar of any one of claims 1 to 6, wherein the retarder comprises any one of citric acid, sodium hexametaphosphate, or protein retarder or a combination of at least two thereof.
8. The self-leveling anti-crack mortar of any one of claims 1 to 7, wherein the dispersible rubber powder comprises VAE redispersible rubber powder.
9. The self-leveling anti-crack mortar of any one of claims 1 to 8, wherein the defoamer comprises a silicone defoamer;
preferably, the silicone antifoam agent comprises a dimethylsiloxane and/or a polyether siloxane copolymer.
10. A method for preparing the self-leveling anti-crack mortar of any one of claims 1 to 9, wherein the method comprises the following steps:
putting the building gypsum, the modified cement, the fly ash, the rubber particles, the polypropylene fibers, the water reducing agent, the cellulose ether, the retarder, the dispersible rubber powder and the defoaming agent into a mixer according to the parts by weight, and mixing for 20-30min at the rotating speed of 100-200 r/min; and then, adding water according to the standard thickening water demand of gypsum self-leveling JC/T1023-2007, and continuously mixing for 15-20min at the rotating speed of 400-600r/min to obtain the self-leveling anti-crack mortar.
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| CN107324746A (en) * | 2017-07-19 | 2017-11-07 | 刘少伟 | A kind of new gravity flowing levelling mortar and its production technology |
| CN113292304A (en) * | 2021-06-17 | 2021-08-24 | 烟台瑞祥干混砂浆有限公司 | Anti-crack gypsum-based self-leveling mortar and preparation process thereof |
| US20220135482A1 (en) * | 2020-11-04 | 2022-05-05 | The Catholic University Of America | High performance hybrid fly ash/calcium aluminate cementitious compositions for mortars and concretes |
| CN114644501A (en) * | 2022-04-01 | 2022-06-21 | 江苏一夫科技股份有限公司 | Anhydrous gypsum self-leveling material and preparation method thereof |
| CN114835460A (en) * | 2022-03-16 | 2022-08-02 | 重庆杰博思石膏有限公司 | Anti-cracking gypsum-based self-leveling mortar and preparation method thereof |
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| CN107324746A (en) * | 2017-07-19 | 2017-11-07 | 刘少伟 | A kind of new gravity flowing levelling mortar and its production technology |
| US20220135482A1 (en) * | 2020-11-04 | 2022-05-05 | The Catholic University Of America | High performance hybrid fly ash/calcium aluminate cementitious compositions for mortars and concretes |
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Application publication date: 20221118 |