CN114105565A - Ground mortar and preparation method thereof - Google Patents
Ground mortar and preparation method thereof Download PDFInfo
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- CN114105565A CN114105565A CN202111502529.XA CN202111502529A CN114105565A CN 114105565 A CN114105565 A CN 114105565A CN 202111502529 A CN202111502529 A CN 202111502529A CN 114105565 A CN114105565 A CN 114105565A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 95
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 87
- 238000005498 polishing Methods 0.000 claims description 73
- 239000000919 ceramic Substances 0.000 claims description 72
- 238000003756 stirring Methods 0.000 claims description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 28
- 239000002562 thickening agent Substances 0.000 claims description 19
- -1 polypropylene Polymers 0.000 claims description 17
- 239000004743 Polypropylene Substances 0.000 claims description 15
- 229920001155 polypropylene Polymers 0.000 claims description 15
- 238000006703 hydration reaction Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 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
- 239000010883 coal ash Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 20
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 239000002699 waste material Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 239000006087 Silane Coupling Agent Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 239000004094 surface-active agent Substances 0.000 description 11
- 239000007822 coupling agent Substances 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000011259 mixed solution Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 8
- 230000036571 hydration Effects 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 239000003112 inhibitor Substances 0.000 description 7
- 238000000498 ball milling Methods 0.000 description 5
- 229920005646 polycarboxylate Polymers 0.000 description 5
- 229910021487 silica fume Inorganic materials 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000006259 organic additive Substances 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000006482 condensation reaction Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 235000010354 butylated hydroxytoluene 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
- 238000010276 construction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 241000252506 Characiformes Species 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910003849 O-Si Inorganic materials 0.000 description 1
- 229910003872 O—Si Inorganic materials 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- 229910006283 Si—O—H Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical compound COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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
- C04B2111/60—Flooring 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
- 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
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 relates to ground mortar and a preparation method thereof, wherein the ground mortar comprises the following raw materials in parts by weight: 15-25 parts of cement; 25-40 parts of admixture; 25-35 parts of sand; 3-4 parts of a polycarboxylic acid water reducing agent; 2-3 parts of fibers; and (3) water. According to the ground mortar and the preparation method thereof provided by the invention, the fibers are added into the ground mortar, so that the anti-cracking capability of the ground mortar is improved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to ground mortar and a preparation method thereof.
Background
The ground mortar is a granular or powdery material prepared by physically mixing dry and screened aggregate (such as quartz sand), inorganic cementing material (such as cement), additive (such as polymer) and the like according to a certain proportion, and the ground mortar is transported to a construction site in a bag or in bulk form and is used for leveling the inner and outer ground of a building after being mixed with water.
However, the ground mortar on the market has the problem of poor crack resistance because the ground mortar cracks and expands due to plastic shrinkage, drying shrinkage and temperature change of the ground mortar in the using process.
Disclosure of Invention
Based on the above, the invention provides the ground mortar with strong crack resistance and the preparation method thereof.
The ground mortar comprises the following raw materials in parts by weight:
preferably, the admixture includes at least one of mineral powder, coal ash and modified ceramic polishing powder.
Preferably, the fiber includes any one of polypropylene fiber, basalt fiber, carbon fiber, and quartz fiber.
Preferably, the polypropylene fibers have a monofilament length of 6mm and a diameter of 10-20 mm.
Preferably, the preparation raw materials of the ground mortar further comprise, by weight:
2.5 parts of a thickening agent.
Preferably, the thickener includes at least one of an inorganic thickener, an ether-based thickener, and a polyacrylate thickener.
Preferably, the cement comprises at least one of composite portland cement PC32.5 and ordinary portland cement p.o42.5.
Preferably, the fineness modulus of the sand is 2.3-3.2.
The invention also provides a preparation method of the ground mortar, which comprises the following steps:
mixing 15-25 parts of cement, 25-40 parts of admixture, 25-35 parts of sand, 3-4 parts of polycarboxylic acid water reducer, 2-3 parts of fiber and water in parts by weight, and stirring for dissolving to obtain the product, namely the ground mortar.
Preferably, the preparation method of the ground mortar comprises the following steps:
the method comprises the following steps of (1) physically stirring cement, an admixture and sand, and uniformly stirring to obtain a first mixture;
adding water into the first mixture, carrying out hydration reaction on the cement, the admixture and the water, and uniformly stirring to obtain a second mixture;
and adding a polycarboxylic acid water reducing agent and fibers into the second mixture, and uniformly stirring to obtain the ground mortar.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by adding the fibers, the fibers have better dispersibility, and can be uniformly dispersed after being added into the ground mortar to form a criss-cross net structure, so that the expansion of ground mortar cracks caused by plastic shrinkage, drying shrinkage and temperature change of the ground mortar can be effectively inhibited, the occurrence of new cracks is delayed, and the crack resistance of the ground mortar is improved.
In addition, the fibers are mixed in the ground mortar, and cement in the ground mortar can wrap the surfaces of the fibers, so that the fluidity of the ground mortar is reduced, the segregation and bleeding conditions of the ground mortar are improved, and the anti-segregation performance of the ground mortar is improved.
The polycarboxylate superplasticizer can reduce the water consumption of the ground mortar and can realize the fluidity of the ground mortar.
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, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides ground mortar, which comprises the following raw materials in parts by weight:
according to the invention, by adding the fibers, the fibers have better dispersibility, and can be uniformly dispersed after being added into the ground mortar to form a criss-cross net structure, so that the expansion of ground mortar cracks caused by plastic shrinkage, drying shrinkage and temperature change of the ground mortar can be effectively inhibited, the occurrence of new cracks is delayed, and the crack resistance of the ground mortar is improved.
In addition, the fibers are mixed in the ground mortar, and cement in the ground mortar can wrap the surfaces of the fibers, so that the fluidity of the ground mortar is reduced, the segregation and bleeding conditions of the ground mortar are improved, and the anti-segregation performance of the ground mortar is improved.
The polycarboxylate superplasticizer can reduce the water consumption of the ground mortar and can realize the fluidity of the ground mortar.
Specifically, the water reducing efficiency of the polycarboxylic acid water reducing agent is 30-36%.
In some embodiments, the admixture comprises at least one of mineral fines, coal ash, and modified ceramic polishing powder.
In some embodiments, the fibers comprise any one of polypropylene fibers, basalt fibers, carbon fibers, and quartz fibers.
In some embodiments, the polypropylene fibers have a filament length of 6mm and a fiber diameter of 10-20 mm.
The excessive monofilament length of the polypropylene fiber can influence the dispersibility of the ground mortar, and the addition of the polypropylene fiber with the excessive monofilament length into the ground mortar can reduce the anti-cracking effect of the ground mortar; too large a diameter of the polypropylene fiber affects the compressive strength of the ground mortar; therefore, by setting the length and diameter of the polypropylene fiber filaments to the above values, the dispersibility of the floor mortar can be improved, and the compressive strength of the floor mortar can be improved.
In some embodiments, the ground mortar is prepared from the following raw materials in parts by weight:
2.5 parts of a thickening agent.
The thickening agent is added into the ground mortar to increase the consistency of the ground mortar, so that the water retention effect of the mortar is improved.
In some embodiments, the thickener comprises at least one of an inorganic thickener, an ether thickener, and a polyacrylate thickener.
In some embodiments, the cement includes at least one of composite portland cement PC32.5 and portland cement p.o42.5.
In some embodiments, the sand has a fineness modulus of 2.3 to 3.2.
The fineness modulus of the sand is preferably 2.3-3.0, the fineness modulus of the sand can influence the fluidity, the workability and the water consumption of a mixture, the water retention performance of the coarse sand is easily reduced, and the fluidity and the consistency of the fine sand are influenced, so that more water is added to the ground mortar during actual stirring; therefore, by setting the fineness modulus of sand to the above value, the effect of improving the fluidity and water retentivity of the ground mortar can be achieved.
In some embodiments, the activity of the modified ceramic polishing powder>65% of specific surface area>1023m2Density/kg>2.56g/cm3。
The activity of the modified ceramic polishing powder is more than 65%, so that the activity of the modified ceramic polishing powder is in a range, the quality of the modified ceramic polishing powder is stable, and the modified ceramic polishing powder is used for replacing fly ash and mineral powder in ground mortar, so that the stability of the water retention and compressive strength of the ground mortar can be improved.
The activity of the modified ceramic polishing powder refers to the strength after replacing a certain amount of cement, and the activity index is measured according to the compressive strength ratio of 7d to 28d, which is shown in GB/T1596-2017 appendix C.
In some embodiments, the ground mortar is prepared from the following raw materials in parts by weight:
in some embodiments, the ground mortar is prepared from the following raw materials in parts by weight:
the invention also provides a preparation method of the ground mortar, which comprises the following steps:
mixing 15-25 parts of cement, 25-40 parts of admixture, 25-35 parts of sand, 3-4 parts of polycarboxylic acid water reducer, 2-3 parts of fiber and water in parts by weight, and stirring for dissolving to obtain the product, namely the ground mortar.
Concretely, after water is added, the cement and the admixture undergo hydration reaction to form hydration products, and the hydration products contain Ca (OH)2Solution, Ca (OH)2The solution quickly reaches saturation and precipitates crystals, and meanwhile, ettringite crystals and hydrated calcium silicate gel are generated.
In some embodiments, a method of preparing a floor screed comprises the steps of:
and S100, physically stirring the cement, the admixture and the sand, and uniformly stirring to obtain a first mixture.
Specifically, the cement, the admixture and the sand are physically stirred to uniformly mix the cement, the admixture and the sand, so that the cement, the admixture and the sand are prevented from sticking to the bottom after water is added.
When cement, admixture, sand, polycarboxylate water reducer, fiber and water are mixed simultaneously, organic additives (polycarboxylate water reducer and fiber) are absorbed and agglomerated by inorganic powder (cement, admixture and sand), therefore, the inorganic powder (cement, admixture and sand) must be mixed uniformly, and then the organic additives (polycarboxylate water reducer and fiber) are added, so that the raw materials for preparing the ground mortar can be mixed more uniformly, and the performance of the ground mortar is improved more obviously.
And S200, adding water into the first mixture, carrying out hydration reaction on the cement, the admixture and the water, and uniformly stirring to obtain a second mixture.
S300, adding a polycarboxylic acid water reducing agent and polypropylene fibers into the second mixture, and uniformly stirring to obtain the ground mortar.
After water is added, the cement and the admixture undergo 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, therefore, inorganic powder (cement, admixture and sand) needs to be mixed before water is added, otherwise, the cement and the admixture are hydrated into gel after the water is added, the cement, the admixture and the sand are difficult to be uniformly mixed, after the water is added, the organic additive can be dispersed, otherwise, the organic additive is absorbed and agglomerated by the inorganic powder.
Specifically, adding the polycarboxylic acid water reducing agent and the polypropylene fibers into the second mixture, uniformly stirring, wherein the stirring time is not less than 1.5 min.
In some embodiments, the mass ratio of the first mixture to the water is 1:0.35 to 0.45.
In some embodiments, the method of preparing the modified ceramic polishing powder comprises the steps of:
s101, after ball milling is carried out on the ceramic polishing powder waste, adding mixed liquor of concentrated sulfuric acid and hydrogen peroxide into the ceramic polishing powder waste, stirring and reacting, and obtaining the hydroxylated ceramic polishing powder after the reaction is finished.
The purpose of adding the mixed solution of concentrated sulfuric acid and hydrogen peroxide into the ceramic polishing powder waste is to activate the ceramic polishing powder waste after ball milling and add SiO in the ceramic polishing powder waste after ball milling2Hydroxyl (Si-O-Si → Si-O-H) is introduced to improve the grafting rate of the subsequent ceramic polishing powder waste and the silane coupling agent, and the hydroxylated ceramic polishing powder is obtained after washing and drying.
The mixed liquid of concentrated sulfuric acid and hydrogen peroxide is also called piranha solution and has strong oxidability.
In some embodiments, the specific steps of ball milling the ceramic polishing powder waste are as follows: grinding the specific surface area of the ceramic polishing powder waste to 850-900 m by using a ball mill2And/kg, so as to increase the contact area of the ceramic polishing powder waste and the mixed solution of concentrated sulfuric acid and hydrogen peroxide for reaction, and further improve the reaction efficiency.
In one embodiment, the mass concentration of the concentrated sulfuric acid is preferably 98%, the mass solubility of the hydrogen peroxide is preferably 30%, and the volume ratio of the concentrated sulfuric acid to the hydrogen peroxide is 8-6: 3.
The mass ratio of the ceramic polishing powder waste to the mixed liquid of concentrated sulfuric acid and hydrogen peroxide is 7-9: 9.
In some embodiments, the mixed solution of concentrated sulfuric acid and hydrogen peroxide is added into the ceramic polishing powder waste, and the reaction time is 30min, and the reaction temperature is 70 ℃.
S201, melting the hydroxylated ceramic polishing powder, the silane coupling agent and the polymerization inhibitor into toluene for modification, and obtaining the coupling agent modified ceramic polishing powder after the modification is finished.
Specifically, toluene is used as a solvent, a silane coupling agent and hydroxyl groups of the hydroxylated ceramic polishing powder are subjected to condensation reaction and are connected by siloxane bonds (Me-O-Si + Si-OH → MeOH + Si-O-Si), and the coupling agent modified ceramic polishing powder is obtained by drying.
The silane coupling agent is used for connecting the particles of the ceramic polishing powder with the molecules of the surfactant in the subsequent step S301, so that the ceramic polishing powder and the surfactant are combined more effectively, and the dispersion effect of the ceramic polishing powder is enhanced.
The polymerization inhibitor is added in the step of preparing the coupling agent modified ceramic polishing powder in order to reduce the reaction rate of the condensation reaction of the silane coupling agent and the hydroxylated ceramic polishing powder and achieve the purpose of preventing the condensation reaction of the silane coupling agent and the hydroxylated ceramic polishing powder from generating sudden polymerization.
In some embodiments, the polymerization inhibitor comprises any one of hydroquinone, p-hydroxyanisole, and 2, 6-di-tert-butyl-4-methylphenol (BHT).
In some embodiments, the mass concentration of the polymerization inhibitor is preferably 1%.
In some embodiments, the silane coupling agent comprises an amino-functional silane coupling agent (KH-550), a gamma- (2, 3-glycidoxy) propyltrimethoxysilane coupling agent (KH-560), gamma-methacryloxypropyltrimethoxysilane; any one of silane coupling agents (KH-570).
S301, adding the coupling agent modified ceramic polishing powder into a surfactant solution, stirring, uniformly stirring to obtain a mixed solution, carrying out centrifugal separation on the mixed solution, drying the centrifugally separated solid, adding silica fume into the dried solid, and uniformly mixing to obtain the modified ceramic polishing powder.
Specifically, the ceramic polishing powder modified by the coupling agent is added into a surfactant solution to perform surface modification treatment on the ceramic polishing powder, and a solute in the surfactant is adsorbed on the surface of the ceramic polishing powder, so that an organic molecular layer is formed on the surface of the ceramic polishing powder, and the ceramic polishing powder is changed from hydrophilicity to hydrophilicity.
And (3) centrifugally separating the mixed solution, and drying the centrifugally separated solid to remove the unreacted silane coupling agent, the polymerization inhibitor and the surfactant.
The silicon ash refers to SiO generated in the smelting of ferrosilicon and industrial silicon2And Si gas and oxygen in the air are quickly oxidized and condensed to form a siliceous powder material, and the purpose of adding the silica fume into the modified ceramic polishing powder is that when the modified ceramic polishing powder is stirred with cement, the silica fume in the modified ceramic polishing powder fills gaps among cement particles, and simultaneously, the silica fume is mixed with the cement to form the siliceous powder materialAnd the cement and hydration products of the cement form gel, so that the water retention and the compressive strength of the ground mortar are improved.
In some embodiments, the surfactant is preferably a quaternary ammonium surfactant.
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 ground mortar.
In some embodiments, the mass ratio of the hydroxylated ceramic polishing powder to the silane coupling agent to the polymerization inhibitor to the toluene is 1: 1: 0.25: 2.5.
in some embodiments, in the step of modifying the hydroxylated ceramic polishing powder, the silane coupling agent and the polymerization inhibitor by melting into toluene, the modification temperature is 80 ℃, and the modification time is 4 hours.
The mass ratio of the coupling agent modified ceramic polishing powder to the surfactant solution is 1: 1-1.5
Adding the coupling agent modified ceramic polishing powder into a surfactant solution, stirring and reacting for 3.5-4.5 h at 75-85 ℃.
Example 1
Physically stirring 20kg of ordinary portland cement P.O42.5, 35kg of modified ceramic polishing powder and 30kg of sand for 0.5min to obtain a first mixture;
adding 35kg of water into the first mixture, and stirring for 1min to obtain a second mixture;
adding 3.5kg of polycarboxylic acid water reducing agent, 2kg of polypropylene fiber and 2.5kg of thickening agent into the second mixture, and stirring for 3.5min to react to obtain ground mortar;
wherein the sand is machine-made sand with fineness modulus of 2.8, and the activity of the modified ceramic polishing powder>65% of specific surface area>1023m2Density/kg>2.56g/cm3。
Example 2
Physically stirring 18kg of ordinary portland cement P.O42.5, 33kg of modified ceramic polishing powder and 26kg of sand for 1min to obtain a first mixture;
adding 30kg of water into the first mixture, and stirring for 1min to obtain a second mixture;
adding 3.2kg of polycarboxylic acid water reducing agent, 2.5kg of polypropylene fiber and 2.2kg of thickening agent into the second mixture, and stirring for 3min to react to obtain ground mortar;
wherein the sand is machine-made sand with fineness modulus of 3.0, and the activity of the modified ceramic polishing powder>65% of specific surface area>1023m2Density/kg>2.56g/cm3。
Example 3
Carrying out physical stirring on 23kg of ordinary portland cement P.O42.5, 28kg of modified ceramic polishing powder and 32kg of sand, and stirring for 1.5min to obtain a first mixture;
adding 40kg of water into the first mixture, and stirring for 0.5min to obtain a second mixture;
adding 3.6kg of polycarboxylic acid water reducing agent, 2.8kg of polypropylene fiber and 2.7kg of thickening agent into the second mixture, and stirring for 3min to react to obtain ground mortar;
wherein the sand is machine-made sand with fineness modulus of 2.6, and the activity of the modified ceramic polishing powder>65% of specific surface area>1023m2Density/kg>2.56g/cm3。
Comparative example 1
In close contrast to example 3, 18kg of modified ceramic polishing powder was replaced by 10kg of fly ash and 8kg of mineral powder in the preparation of the floor mortar and used for comparative study with the floor mortar of the present invention.
Comparative example 2
With strict reference to example 3, a floor mortar was prepared without adding fibres and was used for a comparative study with the floor mortar according to the invention.
The preparation methods of the modified ceramic polishing powders used in examples 1 to 3 and comparative example 1 were as follows:
ball-milling the surface area of the ceramic polishing powder waste to 850-900 m2Adding a mixed solution of 98% concentrated sulfuric acid and 30% hydrogen peroxide into the ceramic polishing powder waste, stirring, heating at 70 ℃, stirring, reacting for 30 minutes, preparing the 98% concentrated sulfuric acid and the 30% hydrogen peroxide according to a ratio of 7:3, and obtaining hydroxylated ceramic polishing powder after the reaction is finished;
the method comprises the following steps of (1) melting hydroxylated ceramic polishing powder, a silane coupling agent and 0.1 wt% of hydroquinone into toluene, heating to 80 ℃, reacting for 4 hours for modification, and preparing coupling agent modified ceramic polishing powder after the modification is finished;
adding the coupling agent modified ceramic polishing powder into a surfactant solution, stirring for reaction, reacting at 80 ℃ for 5 hours to obtain a mixed solution after the reaction is finished, carrying out centrifugal separation on the mixed solution, drying the centrifugally separated solid, and uniformly mixing the dried solid and silica fume to obtain the modified ceramic polishing powder.
Performance testing of ground mortar
The ground mortars prepared in the above examples 1 to 3 and comparative example 1 were subjected to the following standard: JC/T2457-2018 Dry-Mixed floor mortar for construction carry out performance test, and the results are shown in Table 1:
TABLE 1 Performance test results for ground mortar
The test results in the table 1 show that the environmental protection mortar can meet the requirements of national standard JC/T2457-2018 'Dry-mixed floor mortar for buildings' in various properties.
Comparing the data of example 3 with that of comparative example 1, example 3 doped with the modified ceramic polishing powder has higher compressive strength and flexural strength than comparative example 1 doped with conventional admixtures (coal ore powder and ore powder), which shows that the modified ceramic polishing powder used in the present application can replace coal ore powder and has improved compressive strength and flexural strength, and example 3 doped with the modified ceramic polishing powder has lower consistency than comparative example 1 doped with conventional admixtures (coal ore powder and ore powder), which shows that the ground mortar prepared by the method has improved fluidity.
From the data of example 1, example 2 and example 3, it can be seen that there are two samples with compressive strength exceeding that of comparative example 1, which is more flexible in strength adjustment. The three examples are all higher than the comparative example in the aspect of the flexural strength and are reliable in the flexural strength, and the three examples are all higher than the comparative example in the aspect of the flexural strength and are reliable in the flexural strength. With the change of the mixing amount of the polishing powder, the consistency, the compressive strength and the precipitation resistance strength are changed, so that the mixing amount of the modified ceramic polishing powder can be adjusted to meet more engineering requirements.
The modified ceramic polishing powder is related to the morphological effect of the modified ceramic polishing powder, one part of the modified ceramic polishing powder participates in the hydration of cement to generate more hydration products, the unit water consumption of the mortar can be reduced, the other part of the modified ceramic polishing powder which does not participate in the hydration is filled among cement particles, and then the pores formed after the mortar is hardened by redundant water are reduced, so that the structure of the ground mortar is more compact, and the performances of the ground mortar, such as compressive strength, precipitation resistance and the like, are improved.
Comparing the flexural strength data of example 3 with that of comparative example 2, the flexural strength of comparative example 2 without the addition of fibers was significantly lower than that of example 3, and from the flexural strength data of example 1, example 2 and example 3, it can be seen that the flexural strength increased with the increase in the amount of the fibers incorporated, indicating that the addition of fibers can improve the anti-settling property of the floor mortar.
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 ground mortar is characterized in that the ground mortar is prepared from the following raw materials in parts by weight:
and (3) water.
2. The floor screed of claim 1, wherein the admixture comprises at least one of mineral fines, coal ash, and modified ceramic polishing powder.
3. The ground screed of claim 1, wherein the fibers comprise any one of polypropylene fibers, basalt fibers, carbon fibers, and quartz fibers.
4. The floor screed according to claim 3, wherein the polypropylene fibres have a filament length of 6mm and a diameter of 10-20 mm.
5. The ground mortar of claim 1, wherein the raw materials for preparing the ground mortar further comprise, in parts by weight:
2.5 parts of a thickening agent.
6. The ground screed of claim 5, wherein the thickener comprises at least one of an inorganic thickener, an ether thickener, and a polyacrylate thickener.
7. The ground screed of claim 1, wherein the cement comprises at least one of Portland composite cement PC32.5 and Portland cement P.O42.5.
8. The ground mortar of claim 1, wherein the sand has a fineness modulus of 2.3 to 3.2.
9. A preparation method of ground mortar is characterized by comprising the following steps:
mixing 15-25 parts of cement, 25-40 parts of admixture, 25-35 parts of sand, 3-4 parts of polycarboxylic acid water reducer, 2-3 parts of fiber and water in parts by weight, and stirring for dissolving to obtain the product, namely the ground mortar.
10. The method for preparing the ground mortar according to claim 9, wherein the method for preparing the ground mortar comprises the steps of:
the method comprises the following steps of (1) physically stirring cement, an admixture and sand, and uniformly stirring to obtain a first mixture;
adding water into the first mixture, carrying out hydration reaction on the cement, the admixture and the water, and uniformly stirring to obtain a second mixture;
and adding a polycarboxylic acid water reducing agent and fibers into the second mixture, and uniformly stirring to obtain the ground mortar.
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