CN115677307A - Gypsum-based self-leveling mortar and preparation method thereof - Google Patents
Gypsum-based self-leveling mortar and preparation method thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 96
- 239000010440 gypsum Substances 0.000 title claims abstract description 77
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 18
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 17
- 239000003381 stabilizer Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 239000013530 defoamer Substances 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000011398 Portland cement Substances 0.000 claims description 11
- 239000006004 Quartz sand Substances 0.000 claims description 8
- 150000004683 dihydrates Chemical group 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229920002907 Guar gum Polymers 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 229920002310 Welan gum Polymers 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 3
- 239000000665 guar gum Substances 0.000 claims description 3
- 235000010417 guar gum Nutrition 0.000 claims description 3
- 229960002154 guar gum Drugs 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 102000004169 proteins and genes Human genes 0.000 claims description 3
- 108090000623 proteins and genes Proteins 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 230000000740 bleeding effect Effects 0.000 abstract description 11
- 238000004062 sedimentation Methods 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000002426 superphosphate Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- 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
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses gypsum-based self-leveling mortar and a preparation method thereof, wherein the mortar comprises the following raw material components: 550 to 700 parts by mass of gypsum, 20 to 40 parts by mass of cement, 250 to 400 parts by mass of aggregate, 10 to 30 parts by mass of filler, 1 to 2 parts by mass of water reducing agent, 0.3 to 1.2 parts by mass of retarder, 0.5 to 0.8 part by mass of cellulose ether, 0.6 to 0.8 part by mass of defoamer, 0.02 to 0.05 part by mass of stabilizer, 0 to 0.5 part by mass of excitant and 0.5 to 1.5 parts by mass of polyvinyl alcohol; the water-material mass ratio of the mortar is 0.27-0.33, the gypsum-based self-leveling mortar prepared by the proportion has good fluidity, and no bleeding and sedimentation phenomena exist on the premise of sufficient operable time. And the fluidity of the mortar is not greatly increased along with the increase of the water consumption, and after the mortar is hardened, the surface of the mortar is smooth and flat, the hardness is high, the wear resistance is good, and the powder falling phenomenon is avoided.
Description
Technical Field
The application belongs to the field of self-leveling mortar, and particularly relates to gypsum-based self-leveling mortar and a preparation method thereof.
Background
The gypsum-based self-leveling mortar is one of self-leveling mortars, can effectively improve the construction efficiency, saves the labor cost, and has very wide application in indoor floor decoration and fitment projects. Compared with cement-based self-leveling mortar, the gypsum-based self-leveling mortar has the characteristics of high setting and hardening speed and high early strength, and can be normally set and hardened even under the low-temperature condition. Meanwhile, the hardened steel plate has better dimensional stability and small risk of hollowing and cracking, and can be used for thick-layer and large-area construction.
When the gypsum-based self-leveling mortar is used, water is added according to a specified water-material ratio, and the mixture is uniformly mixed to carry out pouring. However, in actual field operation, the actual water-to-material ratio often exceeds the specified water-to-material ratio due to the accuracy of the metering device and the limitations of the power of the stirring device, and the specific requirements of field construction.
When the water consumption of the gypsum-based self-leveling mortar prepared in the prior art is too large, the gypsum-based self-leveling mortar is easy to generate water bleeding and sedimentation. After hardening, the mortar has low surface strength and severe dusting or unevenness caused by surface sedimentation.
Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the gypsum-based self-leveling mortar which has good fluidity, high strength, outstanding bleeding prevention and sedimentation prevention effects and high surface flatness and smoothness after hardening, and the mortar comprises the following raw material components: 550 to 700 parts by mass of gypsum, 20 to 40 parts by mass of cement, 250 to 400 parts by mass of aggregate, 10 to 30 parts by mass of filler, 1 to 2 parts by mass of water reducing agent, 0.3 to 1.2 parts by mass of retarder, 0.5 to 0.8 part by mass of cellulose ether, 0.6 to 0.8 part by mass of defoaming agent, 0.02 to 0.05 part by mass of stabilizer, 0 to 0.5 part by mass of excitant and 0.5 to 1.5 parts by mass of polyvinyl alcohol;
the water-material mass ratio of the mortar is 0.27 to 0.33.
Further, the gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum, and the specific surface area is 600 to 800m 2 /kg。
Further, the cement is 42.5 grade or 52.5 grade portland cement.
Further, the aggregate is 70-140 mesh water-washed river sand or quartz sand.
Further, the filler is silica fume or heavy calcium, and the fineness of the filler is 2000 meshes.
Further, the water reducing agent is a polycarboxylic acid water reducing agent;
the retarder is a protein gypsum retarder;
the cellulose ether is hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 400mPa.s;
the defoaming agent is a polyether powder defoaming agent.
Further, the stabilizer is xanthan gum, guar gum or welan gum.
Further, the excitant is dihydrate gypsum powder, and the fineness of the excitant is 200 meshes.
Further, the polyvinyl alcohol is 05-88 or 05-99 with low degree of polymerization, and the fineness of the polyvinyl alcohol is 100 meshes.
The invention also provides a method for preparing the gypsum-based self-leveling mortar as defined in any one of the above, comprising: preparing the gypsum and the cement as cementing materials;
adding the filler, the aggregate, the water reducing agent, the retarder, the cellulose ether, the defoamer, the stabilizer, the excitant and the polyvinyl alcohol in proportion to mix into a mixture;
uniformly adding the mixture into water according to a certain proportion;
stirring to prepare the gypsum-based self-leveling mortar.
The technical scheme provided by the invention has the following advantages: the gypsum-based self-leveling mortar prepared by the proportion has good fluidity and has no bleeding and sedimentation phenomena on the premise of enough operable time. And along with the increase of water consumption, the fluidity of the mortar is not greatly increased, and after the mortar is hardened, the surface of the mortar is smooth and flat, the hardness is high, the wear resistance is good, and the powder falling phenomenon is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart of a preparation method of the gypsum-based self-leveling mortar of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The invention provides gypsum-based self-leveling mortar, which comprises the following raw material components: 550 to 700 parts by mass of gypsum, 20 to 40 parts by mass of cement, 250 to 400 parts by mass of aggregate, 10 to 30 parts by mass of filler, 1 to 2 parts by mass of water reducing agent, 0.3 to 1.2 parts by mass of retarder, 0.5 to 0.8 part by mass of cellulose ether, 0.6 to 0.8 part by mass of defoamer, 0.02 to 0.05 part by mass of stabilizer, 0 to 0.5 part by mass of excitant and 0.5 to 1.5 parts by mass of polyvinyl alcohol, wherein the mass ratio of water to material in the mortar is 0.277 to 0.33.
In the self-leveling mortar, the powder fineness of gypsum can directly influence the workability of the gypsum-based self-leveling mortar, and if the powder is too coarse, a thief is easy to generate bleeding and settlement phenomena after the mortar is laid. When the powder is too fine, the water consumption of the mortar is increased, and the strength is further reduced. In this embodiment, the gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum, which has characteristics of rapid setting and hardening, large porosity, poor water resistance, and good plasticity, and the embodiments of the present inventionThe specific surface area is 600 to 800m 2 The gypsum hemihydrate is/kg, thereby effectively avoiding the bleeding and sedimentation phenomena in the later period of the mortar.
The cement is portland cement which is portland cement clinker mainly containing calcium silicate, and after mortar is added, the pH of the mortar can be adjusted to be alkaline, so that the functions of other additives can be fully exerted. However, the cement parameter should not be too high, and too high cement parameter can shorten the setting time of mortar, shorten the operable time and reduce the strength. In this embodiment, the cement is 42.5 grade or 52.5 grade cement, and the mixing amount is about 5% of the cementing material, so that the setting time of the mortar is appropriate and the strength is appropriate.
In this embodiment, the filler is one of silica fume and coarse whiting, the fineness of the filler is 2000 meshes, and the filler is ultrafine filler. The superfine filler can be used for filling pores inside and on the surface of the mortar, so that the structure is more compact, and the flatness and smoothness of the surface are improved. In addition, the superfine filler can also play a role in preventing bleeding to a certain extent, so that the mortar has a better bleeding prevention effect when being solidified in the later period.
In this embodiment, the stabilizer is one of xanthan gum, guar gum, or welan gum, which is a biological polysaccharide gum, and is made of natural polysaccharide, and has the characteristics of thickening, stabilization, gelling, and the like, and when added to mortar, the stabilizer can also effectively reduce bleeding and sedimentation phenomena of mortar, and endow mortar with certain thixotropy. Notably, the amount of stabilizer used is not likely to be excessive, which would otherwise reduce the fluidity of the mortar.
In this embodiment, the activator is dihydrate gypsum, and the dihydrate gypsum is used as a seed crystal in the mortar, which can promote the setting of gypsum and increase the thickening speed of the mortar. If the setting time of the gypsum is prolonged, the thickening speed is still higher, so that the consistency of the gypsum-based self-leveling mortar is increased in the later period, and the continuous sedimentation and bleeding of the mortar are prevented. However, the content of the dihydrate gypsum should be moderate, and too much content of the dihydrate gypsum can cause too much loss of fluidity and too short operable time, and in the embodiment, the fineness of the dihydrate gypsum is 200 meshes.
Polyvinyl alcohol is a common adhesive, and can improve the binding power between mortar and a base layer paved by the mortar, improve the cohesion and improve the wear resistance of a self-leveling surface formed by the mortar. Meanwhile, the mortar also has a certain effect of delaying the thickening of the dihydrate gypsum, and can prevent the fluidity of the mortar from being lost too fast. The polyvinyl alcohol with low polymerization degree has lower viscosity and has smaller influence on the fluidity of the gypsum-based self-leveling mortar. Preferably, 05-88 or 05-99 polyvinyl alcohol with the fineness of 100 meshes is adopted in the embodiment of the invention, and can be quickly dissolved in water, so that the mixing rate of the high-grade self-leveling mortar in the market is increased.
The aggregate is one of 70-140 mesh water-washed river sand or quartz sand, and the aggregate is a granular loose material which plays a role of a framework or filling in the mortar and plays a role of the framework and a supporting role.
The water reducing agent is a mortar admixture capable of reducing mixing water consumption under the condition of maintaining constant mortar slump, has a dispersing effect on mortar particles after mortar is added, can improve the workability, reduces unit water consumption, and improves the fluidity of the mortar admixture, and in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent.
The retarder is an additive capable of reducing the hydration speed and the hydration heat of the mortar and prolonging the setting time, and in the embodiment, the retarder is a protein gypsum retarder.
The cellulose ether is hydroxypropyl methyl cellulose ether, the viscosity of the hydroxypropyl methyl cellulose ether is 400mPa.s, the cellulose ether can be dissolved in water, dilute alkali solution and organic solvent, and the cellulose ether has thermoplasticity, so that the plasticity of the mortar is better.
The defoaming agent is a polyether powder defoaming agent, can eliminate air bubbles in the mortar, prevents the mortar from forming a cavity inside after solidification, and ensures the quality of a self-leveling finished product.
The following examples and comparative examples further illustrate the embodiments described above, but do not limit the invention to the scope of the examples described below. The experimental methods in the following examples, which are not specified in specific conditions, are all conventional methods and conditions, or are selected according to commercial specifications. Reagents, raw materials and equipment which are not specifically described are commercially available and are known in the art, and are not described herein.
Example 1:
the gypsum-based self-leveling mortar comprises the following components in parts by mass: 550 parts of alpha-semi-hydrated gypsum, 20 parts of 52.5 portland cement, 400 parts of quartz sand of 70 to 140 meshes, 30 parts of silica fume, 1 part of water reducing agent, 0.3 part of retarder, 0.8 part of cellulose ether, 0.6 part of defoamer, 0.05 part of stabilizer, 0.5 part of excitant and 0.5 part of polyvinyl alcohol.
Example 2:
the gypsum-based self-leveling mortar comprises the following components in parts by mass: 600 parts of beta-semi-hydrated gypsum (desulfurized building gypsum), 30 parts of 42.5 portland cement, 340 parts of quartz sand of 70 to 140 meshes, 30 parts of triple superphosphate, 1.8 parts of water reducing agent, 0.9 part of retarder, 0.5 part of cellulose ether, 0.8 part of defoaming agent, 0.04 part of stabilizer, 0.3 part of excitant and 1 part of polyvinyl alcohol.
Example 3:
a gypsum-based self-leveling mortar comprises the following components in parts by mass: 650 parts of beta-semi-hydrated gypsum (natural building gypsum), 30 parts of 42.5 portland cement, 300 parts of quartz sand of 70 to 140 meshes, 20 parts of triple superphosphate, 1.5 parts of water reducing agent, 0.7 part of retarder, 0.5 part of cellulose ether, 0.8 part of defoaming agent, 0.04 part of stabilizer, 0.3 part of excitant and 0.8 part of polyvinyl alcohol.
Example 4:
the gypsum-based self-leveling mortar comprises the following components in parts by mass: 700 parts of beta-semi-hydrated gypsum (phosphorus building gypsum), 40 parts of 42.5 Portland cement, 250 parts of river sand washed by water of 70 to 140 meshes, 10 parts of silica fume, 2 parts of water reducing agent, 1.2 parts of retarder, 0.5 part of cellulose ether, 0.8 part of defoaming agent, 0.02 part of stabilizer and 1.5 parts of polyvinyl alcohol.
Comparative example 1:
a gypsum-based self-leveling mortar comprises the following components in parts by mass: 550 parts of alpha-semi-hydrated gypsum, 20 parts of 52.5 Portland cement, 430 parts of quartz sand of 70 to 140 meshes, 1 part of water reducing agent, 0.3 part of retarder, 1.1 part of cellulose ether and 0.6 part of defoaming agent.
Comparative example 2:
a gypsum-based self-leveling mortar comprises the following components in parts by mass: 570 parts of desulfurized building gypsum, 30 parts of 42.5 Portland cement, 400 parts of quartz sand of 70 to 140 meshes, 1.8 parts of water reducing agent, 0.9 part of retarder, 0.7 part of cellulose ether and 0.8 part of defoaming agent.
Comparative example 3:
a gypsum-based self-leveling mortar comprises the following components in parts by mass: 700 parts of beta-semi-hydrated gypsum (phosphorus building gypsum), 40 parts of 42.5 portland cement, 250 parts of 70-140 mesh water-washed river sand, 10 parts of silica fume, 1.8 parts of water reducing agent, 1.2 parts of retarder, 0.5 part of cellulose ether, 0.8 part of defoaming agent and 0.02 part of stabilizer.
The performance of the gypsum-based self-leveling mortar prepared in comparative examples 1 to 4 and comparative examples 1 to 3 can be tested according to JC/T1023-2021 gypsum-based self-leveling mortar, and the specific results are shown in the following table 1:
TABLE 1
As can be seen from table 1, the gypsum-based self-leveling mortar in the embodiment of the present invention has good fluidity and has no bleeding and sedimentation phenomena on the premise of sufficient operable time. And the fluidity of the mortar is not greatly increased along with the increase of water consumption, and after the mortar is hardened, the surface of the mortar is smooth and flat, the hardness is high, the wear resistance is good, the powder falling phenomenon is avoided, the mortar can better adapt to the field production environment, and the phenomenon of waste mortar reworking is avoided.
Referring to fig. 1, the present application also provides a method for preparing the gypsum-based self-leveling mortar of any of the above embodiments, comprising:
s1: preparing gypsum and cement as cementing materials;
s2: adding the filler, the aggregate, the water reducing agent, the retarder, the cellulose ether, the defoamer, the stabilizer, the excitant and the polyvinyl alcohol according to the proportion, and mixing to obtain a mixture;
s3: uniformly adding the mixture into water according to a proportion;
s4: stirring to prepare the gypsum-based self-leveling mortar.
It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. Based on the embodiments of the present invention, those skilled in the art may make other variations or modifications without creative efforts, and shall fall within the protection scope of the present invention.
Claims (10)
1. The gypsum-based self-leveling mortar is characterized by comprising the following raw material components: 550 to 700 parts by mass of gypsum, 20 to 40 parts by mass of cement, 250 to 400 parts by mass of aggregate, 10 to 30 parts by mass of filler, 1 to 2 parts by mass of water reducing agent, 0.3 to 1.2 parts by mass of retarder, 0.5 to 0.8 part by mass of cellulose ether, 0.6 to 0.8 part by mass of defoaming agent, 0.02 to 0.05 part by mass of stabilizer, 0 to 0.5 part by mass of excitant and 0.5 to 1.5 parts by mass of polyvinyl alcohol;
the water-material mass ratio of the mortar is 0.27 to 0.33.
2. The gypsum-based self-leveling mortar according to claim 1, wherein the gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum, and the specific surface area is 600 to 800m 2 /kg。
3. The gypsum-based self-leveling mortar of claim 1, wherein the cement is a 42.5 grade or 52.5 grade portland cement.
4. The gypsum-based self-leveling mortar according to claim 1, wherein the aggregate is 70-140 mesh water-washed river sand or quartz sand.
5. The gypsum-based self-leveling mortar according to claim 1, wherein the filler is silica fume or heavy calcium carbonate, and the fineness of the filler is 2000 mesh.
6. The gypsum-based self-leveling mortar of claim 1, wherein the water reducer is a polycarboxylic acid water reducer;
the retarder is a protein gypsum retarder;
the cellulose ether is hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 400mPa.s;
the defoaming agent is a polyether powder defoaming agent.
7. The gypsum-based self-leveling mortar of claim 1, wherein the stabilizer is xanthan gum, guar gum, or welan gum.
8. The gypsum-based self-leveling mortar according to claim 1, wherein the activator is dihydrate gypsum powder, and the fineness of the activator is 200 meshes.
9. The gypsum-based self-leveling mortar according to claim 1, wherein the polyvinyl alcohol is 05-88 or 05-99 of low polymerization degree, and the fineness of the polyvinyl alcohol is 100 mesh.
10. A process for preparing a gypsum-based self-levelling mortar according to any one of claims 1 to 9, comprising:
preparing the gypsum and the cement as a cementitious material;
adding the filler, the aggregate, the water reducing agent, the retarder, the cellulose ether, the defoamer, the stabilizer, the excitant and the polyvinyl alcohol in proportion to mix into a mixture;
uniformly adding the mixture into water according to a proportion;
stirring to prepare the gypsum-based self-leveling mortar.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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