CN114349439A - Self-leveling mortar and preparation method thereof - Google Patents
Self-leveling mortar and preparation method thereof Download PDFInfo
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- CN114349439A CN114349439A CN202111554784.9A CN202111554784A CN114349439A CN 114349439 A CN114349439 A CN 114349439A CN 202111554784 A CN202111554784 A CN 202111554784A CN 114349439 A CN114349439 A CN 114349439A
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- leveling mortar
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 127
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 116
- 239000000919 ceramic Substances 0.000 claims abstract description 91
- 238000005498 polishing Methods 0.000 claims abstract description 91
- 239000004568 cement Substances 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000010881 fly ash Substances 0.000 claims abstract description 42
- 239000002699 waste material Substances 0.000 claims abstract description 42
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000000701 coagulant Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 22
- 239000002244 precipitate Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 16
- 238000006703 hydration reaction Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229920005646 polycarboxylate Polymers 0.000 claims description 12
- 239000012266 salt solution Substances 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 11
- 229920003086 cellulose ether Polymers 0.000 claims description 11
- 239000004816 latex Substances 0.000 claims description 11
- 229920000126 latex Polymers 0.000 claims description 11
- 239000008030 superplasticizer Substances 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000499 gel Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 230000036571 hydration Effects 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000006259 organic additive Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical group [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention relates to self-leveling mortar and a preparation method thereof, wherein the self-leveling mortar comprises the following raw materials in parts by weight: 120-160 parts of cement; 40-60 parts of quick-hardening cement; a20-240 parts; 180 portions of sand and 1200 portions of sand; 2-8 parts of a polycarboxylic acid water reducing agent; 0.2-0.8 part of coagulant; and water; wherein A comprises at least one of modified ceramic polishing powder and fly ash; the modified ceramic polishing powder is derived from ceramic polishing powder waste. The invention provides self-leveling mortar and a preparation method thereof, which solve the problem of high manufacturing cost of the existing self-leveling mortar while ensuring the performance of the self-leveling mortar.
Description
Technical Field
The invention relates to the technical field of mortar processing, in particular to self-leveling mortar and a preparation method thereof.
Background
The self-leveling mortar has excellent fluidity and rapid solidification, can accelerate the construction speed, and has excellent mechanical property and good abrasion resistance.
The self-leveling mortar is prepared from a gel material and an aggregate, wherein the main component of the gel material is cement, and the high cost of the cement leads to high manufacturing cost of the self-leveling mortar.
Disclosure of Invention
Based on the self-leveling mortar and the preparation method thereof, the invention solves the problem of high cost of the existing self-leveling mortar while ensuring the performance of the self-leveling mortar.
The self-leveling mortar comprises the following raw materials in parts by weight:
wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
Preferably, the rubber-sand ratio of the self-leveling mortar is 1 (1-3).
Preferably, the specific surface area of the fly ash>350kg/m2。
Preferably, the raw materials for preparing the self-leveling mortar further comprise, by weight:
1.2-4 parts of fiber.
Preferably, the fibers include any one of polypropylene fibers, carbon fibers, glass fibers, and basalt fibers.
Preferably, the raw materials for preparing the self-leveling mortar further comprise, by weight:
0.8-2 parts of defoaming agent, 0.8-3.2 parts of retarder, 4-6 parts of cellulose ether and 4-16 parts of redispersible latex powder.
The invention also provides a preparation method of the self-leveling mortar, which comprises the following steps:
120-160 parts of the common cement, 40-60 parts of the quick-setting cement, 20-240 parts of A, 180 parts of the sand, 2-8 parts of the polycarboxylic acid water reducing agent and 0.2-0.8 part of the coagulant are mixed with water in parts by weight and stirred uniformly to obtain the self-leveling mortar.
Wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
Preferably, the preparation method of the self-leveling mortar comprises the following steps:
physically stirring the common cement, the quick-hardening cement, the modified ceramic polishing powder, the fly ash, the dispersible rubber powder, the cellulose ether and the sand, and uniformly stirring to obtain a first mixture;
physically stirring the polycarboxylate superplasticizer, the coagulant, the defoaming agent, the retarder, the fibers and the water, and uniformly stirring to obtain a second mixture;
and adding the second mixture into the first mixture, stirring, carrying out hydration reaction on the common cement, the rapid-hardening cement, the modified ceramic polishing powder and the fly ash, and obtaining the self-leveling mortar after the reaction is finished.
Preferably, the preparation method of the self-leveling mortar comprises the following steps:
mixing 1.2-4 parts of fiber, 120-160 parts of ordinary cement, 40-60 parts of rapid hardening cement, 20-240 parts of A, 1200 parts of sand, 2-8 parts of polycarboxylic acid water reducing agent, 0.2-0.8 part of coagulant and water, and uniformly stirring to obtain the self-leveling mortar.
Preferably, the preparation method of the modified ceramic polishing powder comprises the following steps:
dispersing the ceramic polishing powder waste in water to obtain dispersed ceramic polishing powder waste;
adding an acid solution into the dispersed ceramic polishing powder waste to remove metal oxides on the surface of the ceramic polishing powder waste to obtain the Fe-containing ceramic polishing powder waste3+、Al3+A metal salt solution of (a);
filtering the metal salt solution, and adding an alkali solution into the filtrate to adjust the pH to be alkaline so as to enable Fe in the metal salt solution to be in3+、Al3+Forming hydroxide precipitate;
and (3) washing the hydroxide precipitate with water to remove the alkali solution on the surface of the hydroxide precipitate, and drying and grinding the hydroxide precipitate to obtain the modified ceramic polishing powder.
Compared with the prior art, the invention has the following beneficial effects:
the modified ceramic polishing powder and the fly ash have certain activity, can replace part of cement, can promote the generation of cement hydration products, and the modified ceramic polishing powder and the fly ash which do not participate in hydration are filled in the internal gaps of the self-leveling mortar, so that the internal structure of the self-leveling mortar is more compact, and the later strength of the self-leveling mortar is improved.
The modified ceramic polishing powder used in the invention is derived from ceramic polishing powder waste, realizes the reutilization of the waste, meets the requirement of environmental protection, and reduces the cost of raw materials for preparing the self-leveling mortar.
The fly ash can replace part of cement, is waste powder generated after coal is combusted, realizes reutilization of waste, meets the requirement of environmental protection, and reduces the cost of raw materials for preparing the self-leveling mortar.
A small amount of quick-hardening cement is added into the self-leveling mortar, and the early strength of the quick-hardening cement can provide guarantee for the early strength of the self-leveling mortar; the coagulant can improve the early (1d) strength of the common cement in the self-leveling mortar, and is convenient for the construction of the self-leveling mortar; the polycarboxylate superplasticizer can reduce the water consumption of the self-leveling mortar, so that the water-to-gel ratio of the self-leveling mortar is reduced, and the polycarboxylate superplasticizer can also improve the fluidity and compressive strength of the self-leveling mortar. The combination of the components leads the self-leveling mortar to have excellent compression resistance, crack resistance and wear resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The experimental procedures in the following examples are conventional unless otherwise specified. Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art that when the technical solutions are contradictory or cannot be considered that such a combination does not exist, and the technical solutions are not within the protection scope of the present invention.
The invention provides self-leveling mortar, which comprises the following raw materials in parts by weight:
wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
The modified ceramic polishing powder and the fly ash have certain activity, can replace part of cement, can promote the generation of cement hydration products, and the modified ceramic polishing powder and the fly ash which do not participate in hydration are filled in the internal gaps of the self-leveling mortar, so that the internal structure of the self-leveling mortar is more compact, and the later strength of the self-leveling mortar is improved.
The modified ceramic polishing powder used in the invention is derived from ceramic polishing powder waste, realizes the reutilization of the waste, meets the requirement of environmental protection, and reduces the cost of raw materials for preparing the self-leveling mortar.
The fly ash can replace part of cement, is waste powder generated after coal is combusted, realizes reutilization of waste, meets the requirement of environmental protection, and reduces the cost of raw materials for preparing the self-leveling mortar.
A small amount of quick-hardening cement is added into the self-leveling mortar, and the early strength of the quick-hardening cement can provide guarantee for the early strength of the self-leveling mortar; the coagulant can improve the early (1d) strength of the common cement in the self-leveling mortar, and is convenient for the construction of the self-leveling mortar; the polycarboxylate superplasticizer can reduce the water consumption of the self-leveling mortar, so that the water-to-gel ratio of the self-leveling mortar is reduced, and the polycarboxylate superplasticizer can also improve the fluidity and compressive strength of the self-leveling mortar. The combination of the components leads the self-leveling mortar to have excellent compression resistance, crack resistance and wear resistance.
In some embodiments, the portland cement is preferably 42.5R portland cement.
In some embodiments, the quick-setting cement is preferably 42.5R sulphoaluminate cement.
In some embodiments, the accelerator is preferably a lithium carbonate accelerator.
In some embodiments, the polycarboxylate water reducer has a water reduction rate of 20% to 30%.
Specifically, when the water reducing rate of the polycarboxylate superplasticizer is too low, the polycarboxylate superplasticizer cannot exert the performance of improving the fluidity and compressive strength of the self-leveling mortar; when the water reducing rate of the polycarboxylate superplasticizer is too high, the manufacturing cost of the polycarboxylate superplasticizer is also increased; therefore, by setting the water reducing rate of the polycarboxylic acid water reducing agent to the above value, the effect of improving the fluidity and compressive strength of the self-leveling mortar while satisfying the low cost of the self-leveling mortar can be achieved.
In some embodiments, the fly ash is preferably a class II fly ash, having a specific surface area >350kg/m and a water requirement ratio of no more than 105%.
Specifically, the specific surface area is too small, the particles of the fly ash are too large, and the use of the fly ash with the too large particles in the self-leveling mortar can cause the compressive strength of the self-leveling mortar to be reduced.
Therefore, the class II fly ash is selected to ensure that the compressive strength of the self-leveling mortar can be improved by adding the fly ash into the self-leveling mortar.
In some embodiments, the self-leveling mortar has a mortar/mortar ratio of 1 (1-3).
Specifically, the specific amount of the sand is mainly determined according to a gel material (common cement, quick-hardening cement, modified ceramic polishing powder and fly ash), and the ratio of the gel material to the sand is referred to as the ratio.
In some embodiments, the raw materials for preparing the self-leveling mortar further include, in parts by weight:
1.2-4 parts of fiber.
Specifically, a small amount of fibers are added into the self-leveling mortar, so that the breaking strength of the self-leveling mortar can be increased, and the crack resistance of the self-leveling mortar is improved.
In some embodiments, the fibers comprise any of polypropylene fibers, carbon fibers, glass fibers, and basalt fibers.
In some embodiments, the raw materials for preparing the self-leveling mortar further include, in parts by weight:
0.8-2 parts of defoaming agent, 0.8-3.2 parts of retarder, 4-6 parts of cellulose ether and 4-16 parts of redispersible latex powder.
Specifically, the defoaming agent can reduce large bubbles in the self-leveling mortar, eliminate bad bubbles and enable the self-leveling mortar to have better compactness.
The retarder can act on the quick-hardening cement to slow down the hardening of the quick-hardening cement.
The added cellulose ether has thickening and water-retaining effects on the self-leveling mortar.
The redispersible latex powder can increase the bonding strength of the self-leveling mortar.
The defoaming agent, the retarder, the cellulose ether and the redispersible latex powder can be selectively added according to construction requirements.
In some embodiments, the redispersible latex powder is preferably an ethylene-vinyl acetate copolymer, and can be quickly redispersed into an emulsion with polyvinyl alcohol as a protective colloid after contacting with water, the solid content of the redispersible latex powder is 99%, the apparent density of the redispersible latex powder is preferably 490g/L, and the particle fineness of the redispersible latex powder is less than 5 μm.
Specifically, the redispersible latex powder has too low solid content and too large particle fineness, which means that the gelatin powder has too many impurities, resulting in poor performance of the redispersible latex powder.
Protective colloids refer to substances which increase the stability of an emulsion.
In some embodiments, the raw materials for preparing the self-leveling mortar further include, in parts by weight:
in some embodiments, the retarder is preferably a tartaric acid retarder.
The invention also provides a preparation method of the self-leveling mortar, which comprises the following steps:
120-160 parts of ordinary cement, 40-60 parts of quick-hardening cement, 20-240 parts of A, 1200 parts of sand, 2-8 parts of polycarboxylic acid water reducing agent, 0.2-0.8 part of coagulant and water are mixed and uniformly stirred to obtain the self-leveling mortar.
Wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
The mass ratio of water used for preparing the self-leveling mortar to gel materials (cement, rapid hardening cement, modified ceramic polishing powder and fly ash) is (0.33-0.5): 1.
Concretely, after water is added, the common cement, the quick-hardening cement, the modified ceramic polishing powder and the fly ash are subjected to hydration reaction to form a hydration product, wherein the hydration product contains Ca (OH)2Solution, Ca (OH)2The solution quickly reaches saturation and precipitates crystals, and meanwhile, ettringite crystals and hydrated calcium silicate gel are generated.
According to parts by weight, 1.2-4 parts of fiber, 120-160 parts of ordinary cement, 40-60 parts of rapid hardening cement, 20-240 parts of A, 1200 parts of sand, 2-8 parts of polycarboxylic acid water reducing agent, 0.2-0.8 part of coagulant and water are mixed and stirred uniformly, and the self-leveling mortar is obtained.
Specifically, the fibers have poor dispersibility in water, and are physically stirred in water before being used for preparing the self-leveling mortar, so that the dispersion effect of the fibers is improved, and the fibers can better play a role in improving the crack resistance of the self-leveling mortar.
In some embodiments, the mass ratio of fiber to water is preferably 1: 10.
In some embodiments, the specific steps of fiber dispersion include:
adding the fibers into water, uniformly stirring by using a glass rod, standing for 5min to obtain a fiber aqueous solution, then placing the fiber aqueous solution into a stirrer to stir so as to fully mix the fibers and the water, wherein the rotating speed is 600-1000r/min, the mixing time is 30min, and after the mixing is finished, standing for 30min, so that the self-leveling mortar can be prepared.
In some embodiments, the specific steps of fiber dispersion include:
adding the fibers into water, uniformly stirring by using a glass rod, standing for 5min to obtain a fiber aqueous solution, then placing the fiber aqueous solution in an ultrasonic disperser for 30min to fully mix the fibers and the water, and standing for 30min after dispersion is finished, so that the self-leveling mortar can be prepared.
In some embodiments, a method of making a self-leveling mortar includes the steps of:
and S100, physically stirring cement, quick-hardening cement, modified ceramic polishing powder, fly ash, dispersible rubber powder, cellulose ether and sand, and uniformly stirring to obtain a first mixture.
The cement, the quick-hardening cement, the modified ceramic polishing powder, the fly ash, the dispersible rubber powder, the cellulose ether and the sand are physically stirred, so that the cement, the quick-hardening cement, the modified ceramic polishing powder, the fly ash, the dispersible rubber powder, the cellulose ether and the sand are uniformly mixed, and the cement, the quick-hardening cement, the modified ceramic polishing powder and the fly ash are prevented from generating a gel and being adhered to the bottom after water is added.
S200, physically stirring the polycarboxylate superplasticizer, the coagulant, the defoaming agent, the retarder, the fibers and the water, and uniformly stirring to obtain a second mixture.
Specifically, when cement, quick-setting cement, modified ceramic polishing powder, fly ash, polycarboxylic acid water reducing agent, coagulant, defoaming agent, retarder, fiber and water are mixed simultaneously, organic additives (the polycarboxylic acid water reducing agent, the coagulant, the defoaming agent, the retarder and the fiber) are absorbed and agglomerated by inorganic powder (the cement, the quick-setting cement, the modified ceramic polishing powder and the fly ash), so that the inorganic powder (the cement, the modified ceramic polishing powder and sand) must be uniformly mixed, and then the organic additives (the polycarboxylic acid water reducing agent and the thickening agent) are added, so that the raw materials for preparing the self-leveling mortar can be mixed more uniformly, and the performance of the self-leveling mortar is improved more obviously.
And S300, adding the second mixture into the first mixture, stirring, carrying out hydration reaction on the cement, the rapid-hardening cement, the modified ceramic polishing powder and the fly ash, and obtaining the self-leveling mortar after the reaction is finished.
After water is added, organic powder (cement, rapid hardening cement, modified ceramic polishing powder and fly ash) undergoes hydration reaction to form hydration products, and the hydration products contain Ca (OH)2Solution, Ca (OH)2The solution quickly reaches saturation and precipitates crystals, meanwhile, ettringite crystals and hydrated calcium silicate gel are generated, so that inorganic powder is mixed before water is added (cement, quick-hardening cement, modified ceramic polishing powder and fly ash), otherwise, the cement and the admixture are hydrated into gel after the water is added, and the cement, the admixture and the sand are difficult to be mixedAnd (3) the organic additives can be dispersed after water is added, otherwise, the organic additives are absorbed and agglomerated by the inorganic powder. Therefore, the water can be added directly into the second mixture, or the first mixture can be stirred uniformly and then added with water for stirring, and then the second mixture without water can be added after the water is added for stirring.
In some embodiments, the method of preparing the modified ceramic polishing powder comprises the steps of:
s101, dispersing the ceramic polishing powder waste into water to obtain the dispersed ceramic polishing powder waste.
Specifically, the ceramic polishing powder waste is dispersed in water, so that the ceramic polishing powder waste reacts with subsequent substances more fully, and the utilization rate of the ceramic polishing powder waste is improved.
The volume of water used per 1g of ceramic polishing powder waste is preferably 5ml in some embodiments.
The water is preferably distilled water, and the impurities in the distilled water are less, so that the performance of the modified ceramic polishing powder is better.
S201, adding an acid solution into the dispersed ceramic polishing powder waste to remove metal oxides on the surface of the ceramic polishing powder waste to obtain the Fe-containing ceramic polishing powder waste3+、Al3+A metal salt solution of (a).
In some embodiments, the acid solution is preferably a dilute 8mol/L hydrochloric acid solution.
In some embodiments, the volume of the acid solution used per 1g of the ceramic polishing powder waste is preferably 5 ml.
S301, filtering the metal salt solution, and adding an alkali solution into the filtrate to adjust the pH to be alkaline so as to enable Fe in the metal salt solution3+、Al3+A hydroxide precipitate formed.
S401, washing the hydroxide precipitate with water to remove an alkali solution on the surface of the hydroxide precipitate, and drying and grinding the hydroxide precipitate to obtain the modified ceramic polishing powder.
Example 1
1. Preparing modified ceramic polishing powder:
dispersing the ceramic polishing powder waste in water (5 ml of water per 1g of the ceramic polishing powder waste) to obtain dispersed ceramic polishing powder waste;
adding 8mol/L dilute hydrochloric acid solution (5 ml dilute hydrochloric acid solution per 1g ceramic polishing powder waste) into the dispersed ceramic polishing powder waste to remove metal oxides on the surface of the ceramic polishing powder waste to obtain the Fe-containing ceramic polishing powder waste3+、Al3+A metal salt solution of (a);
adding ammonia water into the metal salt solution to adjust the pH to 8 so as to enable Fe in the metal salt solution3+、Al3+Forming hydroxide precipitate;
and (3) washing the hydroxide precipitate with water to remove ammonia water on the surface of the hydroxide precipitate, and drying and grinding the hydroxide precipitate to obtain the modified ceramic polishing powder.
2. Fiber dispersion:
adding 2 parts by weight of polypropylene fiber into water (the mass ratio of the fiber to the water is 1:10), uniformly stirring by using a glass rod, standing for 5min to obtain a fiber aqueous solution, then placing the fiber aqueous solution in an ultrasonic disperser for 30min to fully mix the fiber and the water, and standing for 30min after dispersion is finished, thus obtaining the self-leveling mortar.
3. Preparing self-leveling mortar:
in parts by weight, 140 parts of 42.5R ordinary portland cement, 60 parts of 42.5R sulphoaluminate cement, 60 parts of modified ceramic polishing powder, 140 parts of II-grade fly ash, 8 parts of dispersible rubber powder, 4 parts of cellulose ether and sand (the rubber-sand ratio is 1:1.5) are physically stirred and uniformly stirred to obtain a first mixture;
physically stirring 4 parts of polycarboxylic acid water reducing agent (the water reducing rate is 28%), 0.5 part of lithium carbonate coagulant, 0.8 part of defoaming agent, 0.8 part of retarder, well dispersed polypropylene fibers and water (the water-gel ratio is 0.38), and uniformly stirring to obtain a second mixture;
and adding the second mixture into the first mixture, stirring, carrying out hydration reaction on 42.5R ordinary portland cement, 42.5R sulphoaluminate cement, modified ceramic polishing powder and II-grade fly ash, and obtaining the self-leveling mortar after the reaction is finished.
Example 2
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
example 3
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
example 4
The raw materials and other steps are the same as those in example 1, and are not described again, and the parts of the raw materials and parts of the raw materials for preparing the self-leveling mortar are as follows by weight:
example 5
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
example 6
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
comparative example 1
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
comparative example 2
The other raw materials and steps are the same as those in example 1, and are not described again, and the parts of the raw materials and the parts by weight for preparing the self-leveling mortar are as follows:
table 1 shows the specific mixing ratio of the raw materials of the self-leveling mortar.
TABLE 1 self-leveling mortar mix proportion (kg)
The self-leveling slurry of the above examples and comparative examples was subjected to a performance test according to the requirements of JC/T985-2017 Cement-based self-leveling mortar for floors, and the results of the performance test are shown in the following table 2:
TABLE 2 self-leveling mortar Performance test results
As shown in Table 2, the mortars of the test examples 1 to 7 all meet the standard requirements of self-leveling mortar, and particularly, after fibers are added, the flexural strength is remarkably improved, and the mortar has excellent performance indexes.
Through the example 1 and the comparative example 1, the modified ceramic polishing powder does not affect the performance of mortar after replacing part of cement, and has excellent physical and mechanical properties.
The working performance of the doped ceramic polishing powder is not greatly different from that of the working performance of the doped ceramic polishing powder in the embodiment 2 and the comparative example 2, but the compressive strength, the breaking strength, the tensile bonding strength and the wear resistance are greatly improved.
The invention provides self-leveling mortar prepared from modified ceramic polishing powder, which utilizes the early strength of quick-hardening cement and the delayed coagulation of the ceramic polishing powder and fly ash, wherein the quick-hardening cement guarantees the early strength of the self-leveling mortar, the volcanic ash activity of the ceramic polishing powder and the fly ash guarantees the later strength of the self-leveling mortar, the cost of the self-leveling mortar is reduced, and the preparation process of the self-leveling mortar is improved. The modified ceramic polishing powder and the fly ash are utilized in a large mixing amount, so that the using amount of cement is reduced, and meanwhile, the workability, strength, durability and economy of the self-leveling mortar are improved, so that the building material embodies better economic effect and environmental protection effect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The self-leveling mortar is characterized in that the self-leveling mortar is prepared from the following raw materials in parts by weight:
wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
2. The self-leveling mortar according to claim 1, wherein the mortar has a mortar/mortar ratio of 1 (1-3).
3. Self-leveling mortar according to claim 1, wherein the specific surface area of the fly ash is>350kg/m2。
4. The self-leveling mortar of claim 1, wherein the raw materials for preparing the self-leveling mortar further comprise, in parts by weight:
1.2-4 parts of fiber.
5. The self-leveling mortar of claim 4, wherein the fibers include any one of polypropylene fibers, carbon fibers, glass fibers, and basalt fibers.
6. The self-leveling mortar of claim 1, wherein the raw materials for preparing the self-leveling mortar further comprise, in parts by weight:
0.8-2 parts of defoaming agent, 0.8-3.2 parts of retarder, 4-6 parts of cellulose ether and 4-16 parts of redispersible latex powder.
7. The preparation method of the self-leveling mortar is characterized by comprising the following steps:
120-160 parts of the common cement, 40-60 parts of the quick-setting cement, 20-240 parts of A, 180 parts of the sand, 2-8 parts of the polycarboxylic acid water reducing agent and 0.2-0.8 part of the coagulant are mixed with water in parts by weight and stirred uniformly to obtain the self-leveling mortar.
Wherein A comprises at least one of modified ceramic polishing powder and fly ash;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
8. The method of preparing a self-leveling mortar according to claim 7, comprising the steps of:
physically stirring the common cement, the quick-hardening cement, the modified ceramic polishing powder, the fly ash, the dispersible rubber powder, the cellulose ether and the sand, and uniformly stirring to obtain a first mixture;
physically stirring the polycarboxylate superplasticizer, the coagulant, the defoaming agent, the retarder, the fibers and the water, and uniformly stirring to obtain a second mixture;
and adding the second mixture into the first mixture, stirring, carrying out hydration reaction on the common cement, the rapid-hardening cement, the modified ceramic polishing powder and the fly ash, and obtaining the self-leveling mortar after the reaction is finished.
9. The method of preparing a self-leveling mortar according to claim 7, comprising the steps of:
mixing 1.2-4 parts of fiber, 120-160 parts of ordinary cement, 40-60 parts of rapid hardening cement, 20-240 parts of A, 1200 parts of sand, 2-8 parts of polycarboxylic acid water reducing agent, 0.2-0.8 part of coagulant and water, and uniformly stirring to obtain the self-leveling mortar.
10. The method for preparing self-leveling mortar according to claim 7, wherein the method for preparing the modified ceramic polishing powder comprises the steps of:
dispersing the ceramic polishing powder waste in water to obtain dispersed ceramic polishing powder waste;
adding an acid solution into the dispersed ceramic polishing powder waste to remove metal oxides on the surface of the ceramic polishing powder waste to obtain the Fe-containing ceramic polishing powder waste3+、Al3+A metal salt solution of (a);
filtering the metal salt solution, and adding an alkali solution into the filtrate to adjust the pH to be alkaline so as to enable Fe in the metal salt solution to be in3+、Al3+Forming hydroxide precipitate;
and (3) washing the hydroxide precipitate with water to remove the alkali solution on the surface of the hydroxide precipitate, and drying and grinding the hydroxide precipitate to obtain the modified ceramic polishing powder.
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| CN116655313A (en) * | 2023-03-06 | 2023-08-29 | 上海耐齐建材有限公司 | Cement self-leveling mortar and preparation method thereof |
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