CN114213094A - Regenerated ceramic powder geopolymer repair mortar and preparation method thereof - Google Patents
Regenerated ceramic powder geopolymer repair mortar and preparation method thereof Download PDFInfo
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- CN114213094A CN114213094A CN202111603141.9A CN202111603141A CN114213094A CN 114213094 A CN114213094 A CN 114213094A CN 202111603141 A CN202111603141 A CN 202111603141A CN 114213094 A CN114213094 A CN 114213094A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/165—Ceramic waste
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- 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
- C04B2111/00017—Aspects relating to the protection of the environment
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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- 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
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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
Abstract
The invention discloses a regenerated ceramic powder geopolymer repair mortar and a preparation method thereof, wherein the regenerated ceramic powder geopolymer repair mortar comprises the following components in parts by weight: 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 0.1-1 part of carbon nano tube, 1-5 parts of nano magnesium oxide, 10-35 parts of iron tailing sand, 0.2-1 part of mixed fiber, 12-35 parts of alkaline activator, 0.4-1.2 parts of retarding water reducer, 0.3-5 parts of water retention thickener and 0.8-3 parts of early strength agent. The reclaimed ceramic powder geopolymer repair mortar is prepared by utilizing the characteristic of volcanic ash activity of ceramic waste and an alkali excitation principle and a certain mixing proportion, and has the technical advantages of better interface compatibility, good bonding strength, no shrinkage and micro-expansion, good mechanical property, high temperature resistance, crack resistance and the like, and has the advantages of low cost, low carbon and environmental protection.
Description
Technical Field
The invention relates to geopolymer repair mortar and a preparation method thereof, in particular to reclaimed ceramic powder geopolymer repair mortar and a preparation method thereof.
Background
Research shows that the main chemical component of the ceramic waste is SiO2、Al2O3、MgO、CaO、K2O、Fe2O3And the like, has the characteristics of good volcanic ash activity, compressive strength, high temperature resistance, corrosion resistance and the like, and is a very suitable recycled material when being applied to geopolymer mortar.
At present, for repairing diseases of concrete structures, repair mortar which takes cement as a cementing material is generally used for repairing; the traditional cement-based repair mortar generally has the problems of large shrinkage deformation, easy cracking and debonding, poor compatibility of a bonding surface and the like. The ideal repair mortar material has the characteristics of excellent interface compatibility, good bonding strength, no shrinkage and micro-expansion, quick hardening and early strength, excellent durability and workability and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the reclaimed ceramic powder geopolymer repair mortar and the preparation method thereof, and the reclaimed ceramic powder geopolymer repair mortar has the characteristics of excellent interface compatibility, good bonding strength, no shrinkage and micro expansion, quick hardening and early strength, excellent durability and workability and the like.
The technical scheme adopted by the invention for realizing the technical aim is to provide the reclaimed ceramic powder geopolymer repair mortar, which comprises the following components in parts by weight: 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 0.1-1 part of carbon nano tube, 1-5 parts of nano magnesium oxide, 10-35 parts of iron tailing sand, 0.2-1 part of mixed fiber, 12-35 parts of alkaline activator, 0.4-1.2 parts of retarding water reducer, 0.3-5 parts of water retention thickener and 0.8-3 parts of early strength agent.
Furthermore, the carbon nano tube is formed by compounding a multi-wall carbon nano tube and a carbon nano tube dispersing agent, wherein the multi-wall carbon nano tube accounts for 70-90% by weight, and the carbon nano tube dispersing agent accounts for 10-30% by weight; the tube diameter of the multi-wall carbon nano tube is 10-50nm, the length is 5-20 mu m, and the specific surface area is 50000-250000m2/kg。
Further, the regenerated ceramic powder is prepared from wall tiles, floor tiles or daily ceramic waste materials through the procedures of crushing by a jaw crusher, washing and selecting and ball mill powder, the particle diameter is 325-800 meshes, and the specific surface area is 350-500m2/kg。
Furthermore, the water-retaining thickener is prepared by compounding 35-60% of organic bentonite, 20-45% of redispersible latex powder and 20-30% of water-soluble polyamide wax according to the weight ratio.
Furthermore, the mixed fiber is formed by mixing 35-55% of basalt chopped fiber, 25-45% of stainless steel powder chopped fiber and 15-35% of polyvinyl alcohol fiber in percentage by weight; the basalt chopped fiber has the average length of 3-4mm, the diameter of 10-20 mu m and the monofilament tensile strength of 2000-4500 MPa; the stainless steel powder short fiber is an alloy material, the average length is 2-3mm, the diameter is 5-10 mu m, and the monofilament tensile strength is 1500-2000 Mpa; the polyvinyl alcohol fiber has the average length of 3-5mm, the diameter of 1-5 μm and the tensile strength of 500-1500 MPa.
Further, the iron tailing sand is prepared by crushing, grinding and washing the solid waste discharged after the concentrate is selected from the iron ore, and the solid waste is selected through the processes of crushing, grinding and water washing, wherein the particle grade is 50-70% by weight of 20-40 meshes, and the particle grade is 30-50% by weight of 40-70 meshes.
Further, the retarding and water reducing agent is prepared by compounding potassium dihydrogen phosphate, sodium gluconate and a polycarboxylic acid water reducing agent, wherein the potassium dihydrogen phosphate accounts for 0.5-2% by weight, the sodium gluconate accounts for 0.5-2% by weight, and the polycarboxylic acid water reducing agent accounts for 96-99% by weight.
Furthermore, the early strength agent is compounded by 40-60% of triethanolamine, 20-30% of ethylene glycol and 15-30% of calcium formate according to the weight ratio.
Further, the nano magnesium oxide is prepared by the following hydrothermal precipitation method: adding a precipitator into the magnesium salt aqueous solution, uniformly stirring, and finally preparing the nano magnesium oxide through the processes of hydrothermal reaction, washing, filtering, drying, grinding and calcining decomposition; the average grain diameter of the nano-magnesia is 10-70nm,the specific surface area is 35000-120000m2/kg。
The invention also provides a preparation method of the reclaimed ceramic powder geopolymer repair mortar for realizing the technical aim, which comprises the following steps: s1), firstly, determining the water-material ratio to be 0.13-0.16, accurately weighing 12-35 parts of alkaline exciting agent, 0.8-3 parts of early strength agent and 1/5 parts of total water consumption, putting into a stirrer together, stirring at high speed for 1-3min until the mixture is uniform, and cooling to room temperature to obtain a mixed solution A for later use; s2) then accurately weighing 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 10-35 parts of iron tailing sand, 0.3-5 parts of water retention thickener, 0.2-1 part of mixed fiber, 0.4-1.2 parts of retarding water reducer, 0.1-1 part of carbon nano tube and 1-5 parts of nano magnesium oxide, putting the materials into a low-speed stirrer, and dry-stirring for 2-3min to be uniform, then throwing 4/5 of total water consumption, and continuing stirring for 2-3min to be uniform to obtain mixed liquid B for later use; s3), finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
Compared with the prior art, the invention has the following beneficial effects: compared with the traditional cement-based repair mortar, the regenerated ceramic powder geopolymer repair mortar provided by the invention has the technical advantages of better interface compatibility, good bonding strength, no shrinkage and micro-expansion, good mechanical property, high temperature resistance, crack resistance and the like, and has economic and policy advantages of low cost, low carbon, environmental protection and the like. Activating the regenerated ceramic powder and the slag powder by using an alkali excitation principle, and filling and bridging the carbon nano tube and the nano magnesium oxide into a three-dimensional structure of the regenerated ceramic powder geopolymer mortar from a microscopic layer in a net shape to play roles in resisting high temperature, cracking, micro-expansion, compensating shrinkage and the like; the application of the mixed fiber penetrates through and is bridged in the geopolymer repair mortar network structure from a macroscopic layer, and the effects of crack resistance, toughening, bonding strength improvement and the like are achieved; the application of the water-retaining thickener ensures that the reclaimed ceramic powder geopolymer repair mortar has good workability, prevents the phenomena of particle stratification, sedimentation and the like, and ensures the construction performance and the construction quality; the setting time is adjusted, the early strength is improved, the construction efficiency is improved and the like while the water-cement ratio is reduced by applying the retarding water reducer and the early strength agent to improve the strength of the repair mortar; moreover, the regenerated ceramic powder geopolymer repair mortar can be fully bonded and adhered with a damaged joint surface, and alkali-activated reaction is generated, so that the repair quality of a damaged part is improved. The method is mainly applied to the fields of repairing projects such as concrete buildings, structures, civil air defense projects, subway tunnels, basements, kitchens, toilets and balconies, plugging and repairing projects of parts such as water and electricity wire grooves, water leakage holes, wall holes and cracks on the upstream surface or the downstream surface, emergency repair of underground pipe galleries, grooves, dam banks and infrastructures, and the like.
Drawings
Fig. 1 is a flow chart of a method for preparing a reclaimed ceramic powder geopolymer repair mortar according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The technical scheme adopted by the invention to achieve the technical aim is to provide the regenerated ceramic powder geopolymer repair mortar, which comprises the following components in parts by weight: 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 0.1-1 part of carbon nano tube, 1-5 parts of nano magnesium oxide, 10-35 parts of iron tailing sand, 0.2-1 part of mixed fiber, 12-35 parts of alkaline activator, 0.4-1.2 parts of retarding water reducer, 0.3-5 parts of water retention thickener and 0.8-3 parts of early strength agent.
Preferably, the regenerated ceramic powder is obtained by recycling ceramic waste materials such as wall tiles, floor tiles, daily ceramics and the like, the ceramic waste materials are prepared by the procedures of crushing by a jaw crusher, washing and selecting, ball mill powder and the like, the particle diameter is 325-800 meshes, and the specific surface area is 350-500 m-2Per kg, the regenerated ceramic powder has good activity and lower hydration water demand within the limited range, and the main chemical component of the regenerated ceramic powder is SiO2、Al2O3、MgO、CaO、 K2O、Fe2O3And the like, and has the characteristics of good volcanic ash activity, compressive strength, high temperature resistance, corrosion resistance and the like.
Preference is given toThe specific surface area of the slag powder is 450-550m2The activity index of/kg, 28d is 95-115%, and the main chemical components are CaO and SiO2、Al2O3And the like.
Preferably, the particle fineness of the phosphogypsum is 140-270 meshes, the mineral composition of the phosphogypsum is mainly compounds of sulfate and phosphate, and the phosphogypsum has the characteristics of adjusting the setting time of the polymer repair mortar of the regenerated ceramic powder, improving the structural compactness of the repair mortar and the like; soluble sulfate and phosphate react with CaO and MgO in the reclaimed ceramic powder geopolymer mortar to generate insoluble sulfate compounds and phosphate compounds (such as calcium phosphate or calcium sulfate), and the pores in the geopolymer mortar structure are filled while the setting time is adjusted; the sulfate in the phosphogypsum and the aluminate in the geopolymer repair mortar can form ettringite, and the ettringite has the characteristics of micro expansion, compensation contraction and the like so as to ensure that the reclaimed ceramic powder geopolymer repair mortar has good volume stability.
Preferably, the carbon nano tube is formed by compounding a multi-wall carbon nano tube and a carbon nano tube dispersant, wherein the multi-wall carbon nano tube accounts for 70-90% by weight, and the carbon nano tube dispersant accounts for 10-30% by weight; the tube diameter of the multi-wall carbon nano tube is 10-50nm, the length is 5-20 mu m, the specific surface area is 50000-250000m2Per kg; the carbon nano tube has outstanding mechanical property, can perform net filling and bridging on the repair mortar from a microscopic level, and achieves the effect of reinforcing and toughening the repair mortar; the carbon nano tube has good electric conduction and heat conduction performance, so that the high temperature resistance and crack resistance of the repair mortar are improved, the using amount of the carbon nano tube needs to be controlled within a limited range, otherwise, the problems that the reinforcing and toughening effect cannot be expected or the dispersibility is poor are easily caused, and the like.
Preferably, the nano magnesium oxide is prepared by a hydrothermal precipitation method, a precipitator is added into a magnesium salt aqueous solution and is uniformly stirred, and the nano magnesium oxide is finally prepared through the processes of hydrothermal reaction, washing and filtering, drying and grinding, calcining and decomposing and the like, wherein the nano magnesium oxide prepared by the hydrothermal precipitation method has the characteristics of high purity, high cost performance and the like; the nano magnesium oxide has an average particle diameter of 10-70nm and a specific surface area of35000-120000m2Kg, the nano-magnesia can not only fill micro pores, but also has little water demand for hydration, stable hydration product, and the hydration product Mg (OH)2The swelling force and the growth pressure of the crystal have expansion effect on the slurry, and the crack resistance and the micro-expansion compensation shrinkage property of the regenerated ceramic powder geopolymer repair mortar are improved.
Preferably, the iron tailings are obtained from solid wastes discharged after selecting ore concentrates from iron ores, and are prepared by the working procedures of crushing, grinding, washing, concentrating and the like again, wherein the particle size distribution is 50-70% by weight of 20-40 meshes, and the particle size distribution is 30-50% by weight of 40-70 meshes. The iron tailing sand has mechanical properties similar to those of natural sand, and can solve the problems of high supply, shortage, high cost and the like of the natural sand; meanwhile, the iron tailing sand has clear edges and corners, and has better matrix compatibility and better bonding strength when being applied to the repair mortar compared with natural sand.
Preferably, the mixed fiber is formed by mixing 35-55% of basalt chopped fiber, 25-45% of stainless steel powder short fiber and 15-35% of polyvinyl alcohol fiber in percentage by weight; wherein the average length of the basalt chopped fiber is 3-4mm, the diameter is 10-20 mu m, and the monofilament tensile strength is 2000-4500 MPa; the stainless steel powder short fiber is an alloy material, the average length is 2-3mm, the diameter is 5-10 mu m, and the monofilament tensile strength is 1500-2000 Mpa; the polyvinyl alcohol fiber is a synthetic fiber, the average length is 3-5mm, the diameter is 1-5 μm, and the tensile strength is 500-; the mixed fiber has the characteristics of good dispersibility, high tensile strength and the like, penetrates through and is bridged in the geopolymer repair mortar network structure from a macroscopic level, and plays roles in resisting cracking, toughening, improving bonding strength and the like; in order to avoid affecting the compressive strength of the repair mortar and the dispersibility of the mixed fibers, the amount of the mixed fibers is controlled within a limited range.
Preferably, the alkali activator consists of water glass and sodium hydroxide, the modulus of the water glass is between 1.0 and 3.0, and the sodium hydroxide is analytically pure.
Preferably, the retarding and water reducing agent is prepared by compounding potassium dihydrogen phosphate, sodium gluconate and a polycarboxylic acid water reducing agent, wherein the potassium dihydrogen phosphate accounts for 0.5-2% by weight, the sodium gluconate accounts for 0.5-2% by weight, and the polycarboxylic acid water reducing agent accounts for 96-99% by weight.
Preferably, the water-retaining thickener is prepared by compounding 35-60% of organic bentonite, 20-45% of redispersible latex powder and 20-30% of water-soluble polyamide wax according to the weight ratio; the water-retaining thickener ensures that the reclaimed ceramic powder geopolymer repair mortar has good workability, prevents the phenomena of particle stratification, sedimentation and the like, and ensures the construction performance and the construction quality.
Preferably, the early strength agent is prepared by compounding 40-60% of triethanolamine, 20-30% of ethylene glycol and 15-30% of calcium formate according to the weight ratio; the early strength agent shortens the setting time of the regenerated ceramic powder geopolymer repair mortar, and simultaneously increases the early strength of the regenerated ceramic powder geopolymer repair mortar, thereby improving the construction efficiency.
The invention also provides a preparation method of the regenerated ceramic powder geopolymer repair mortar, which comprises the following steps:
s1), firstly, determining the water-material ratio to be 0.13-0.16, accurately weighing 12-35 parts of alkaline activator, 0.8-3 parts of early strength agent and 1/5 of total water consumption, putting into a stirrer together, stirring at high speed for 1-3min until the mixture is uniform, and cooling to room temperature (because the alkaline activator is dissolved in water and releases heat, the mixed solution needs to be cooled to the room temperature so as not to influence the slurry performance), thus obtaining a mixed solution A for later use.
S2), then accurately weighing 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 10-35 parts of iron tailing sand, 0.3-5 parts of water retention thickener, 0.2-1 part of mixed fiber, 0.4-1.2 parts of retarding water reducer, 0.1-1 part of carbon nano tube and 1-5 parts of nano magnesium oxide, putting the materials into a low-speed stirrer, and dry-stirring for 2-3min to be uniform, then throwing 4/5 of total water consumption, and continuing stirring for 2-3min to be uniform to obtain mixed liquid B for later use.
S3), finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
Example 1
The reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following components in parts by weight: 55 parts of regenerated ceramic powder, 15 parts of slag powder, 5 parts of phosphogypsum, 0.2 part of carbon nano tube, 1 part of nano magnesium oxide, 10 parts of iron tailing sand, 0.3 part of mixed fiber, 12 parts of alkaline activator, 0.4 part of retarding and water reducing agent, 0.3 part of water-retaining thickener and 0.8 part of early strength admixture.
The preparation method of the reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following steps:
(1) firstly, determining the water-material ratio to be 0.15, accurately weighing 1/5 parts of 12 parts of alkaline activator, 0.8 part of early strength agent and total water consumption, putting the materials into a stirrer together, stirring at high speed for 1-3min until the materials are uniform, and cooling to room temperature (because the alkaline activator is dissolved in water and releases heat, the mixed solution needs to be cooled to the room temperature so as not to influence the slurry performance), so as to obtain a mixed solution A for later use.
(2) Then, 55 parts of regenerated ceramic powder, 15 parts of slag powder, 5 parts of phosphogypsum, 10 parts of iron tailing sand, 0.3 part of water-retaining thickener, 0.3 part of mixed fiber, 0.4 part of retarding water reducer, 0.2 part of carbon nano tube and 1 part of nano magnesium oxide are accurately weighed, put into a low-speed stirrer and are stirred for 2-3min to be uniform, 4/5 of total water consumption is then put into the stirrer, and the mixture is continuously stirred for 2-3min to be uniform, so that mixed liquid B is obtained for later use.
(3) And finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
Example 2
The reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following components in parts by weight: 30 parts of regenerated ceramic powder, 20 parts of slag powder, 5 parts of phosphogypsum, 0.2 part of carbon nano tube, 1.5 parts of nano magnesium oxide, 20 parts of iron tailing sand, 0.3 part of mixed fiber, 20 parts of alkaline activator, 0.8 part of retarding and water reducing agent, 1.2 parts of water-retaining thickener and 1 part of early strength admixture.
The preparation method of the reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following steps:
(1) firstly, determining the water-material ratio to be 0.15, accurately weighing 1/5 of 20 parts of alkaline activator, 1 part of early strength agent and total water consumption, putting into a stirrer together, stirring at high speed for 1-3min until the mixture is uniform, and cooling to room temperature (because the alkaline activator is dissolved in water and releases heat, the mixed solution needs to be cooled to the room temperature so as not to influence the slurry performance), so as to obtain a mixed solution A for later use.
(2) Then accurately weighing 30 parts of regenerated ceramic powder, 20 parts of slag powder, 5 parts of phosphogypsum, 20 parts of iron tailing sand, 1.2 parts of water-retaining thickener, 0.3 part of mixed fiber, 0.8 part of retarding water reducer, 0.2 part of carbon nano tube and 1.5 parts of nano magnesium oxide, putting the materials into a low-speed stirrer, and dry-stirring the materials for 2-3min to be uniform, then adding 4/5 of the total water consumption, and continuing stirring the materials for 2-3min to be uniform to obtain a mixed solution B for later use.
(3) And finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
Example 3
The reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following components in parts by weight: 30 parts of regenerated ceramic powder, 15 parts of slag powder, 5 parts of phosphogypsum, 0.2 part of carbon nano tube, 1.5 parts of nano magnesium oxide, 30 parts of iron tailing sand, 0.3 part of mixed fiber, 15 parts of alkaline activator, 0.8 part of retarding and water reducing agent, 1.2 parts of water-retaining thickener and 1 part of early strength admixture.
The preparation method of the reclaimed ceramic powder geopolymer repair mortar provided by the embodiment comprises the following steps:
(1) firstly, determining the water-material ratio to be 0.15, accurately weighing 1/5 of 15 parts of alkaline activator, 1 part of early strength agent and total water consumption, putting the materials into a stirrer together, stirring at high speed for 1-3min until the materials are uniform, and cooling to room temperature (because the alkaline activator is dissolved in water and releases heat, the mixed solution needs to be cooled to the room temperature so as not to influence the slurry performance), so as to obtain a mixed solution A for later use.
(2) Then accurately weighing 30 parts of regenerated ceramic powder, 15 parts of slag powder, 5 parts of phosphogypsum, 30 parts of iron tailing sand, 1.2 parts of water-retaining thickener, 0.3 part of mixed fiber, 0.8 part of retarding water reducer, 0.2 part of carbon nano tube and 1.5 parts of nano magnesium oxide, putting the materials into a low-speed stirrer, and dry-stirring the materials for 2-3min to be uniform, then adding 4/5 of the total water consumption, and continuing stirring the materials for 2-3min to be uniform to obtain a mixed solution B for later use.
(3) And finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
Comparative example
The cement-based repair mortar provided by the comparative example comprises the following components in parts by weight: 36 parts of ordinary cement, 30 parts of rapid-hardening cement, 2.5 parts of silica fume, 30 parts of natural sand, 0.6 part of water reducing agent and 0.9 part of retarder.
The preparation method of the cement-based repair mortar provided by the comparative example comprises the following steps:
(1) determining the water-material ratio to be 0.15, firstly weighing 0.6 part of water reducing agent, 0.9 part of retarder and 1/4 of total water consumption to fully dissolve the water reducing agent and the retarder to prepare a water reducing and retarding solution for later use.
(2) Then accurately weighing 36 parts of ordinary cement, 30 parts of rapid-hardening cement, 2.5 parts of silica fume, 30 parts of natural sand and 3/4 parts of total water consumption, and putting the materials into a mortar stirrer to be stirred for 2-3min to be uniform.
(3) And finally, pouring the prepared water-reducing and slow-setting solution into a mortar stirrer, continuously stirring for 2-3min until the solution is uniform, filling the solution into a mortar test mold, and curing and forming to obtain the cement-based repair mortar.
The invention refers to JC/T2381 & lt 2016 & gt repair mortar, JG/T336 & lt 2011 & gt polymer cement mortar for concrete structure repair, JT/T1211.1-2018 & lt 1 & gt part of quick repair material for cement concrete for highway engineering: the performance of each of examples 1-3 and comparative examples was tested according to the standards or specifications of Cement-based repair materials, GB/T17671-:
TABLE 1 Performance indices for examples 1-3 and comparative examples
Therefore, the regenerated ceramic powder geopolymer repair mortar provided by the invention activates the regenerated ceramic powder and the slag powder by utilizing the alkali excitation principle, and carbon nanotubes and nano magnesium oxide are filled in a net shape from a microscopic layer and bridged in a three-dimensional structure of the regenerated ceramic powder geopolymer mortar, so that the effects of high temperature resistance, crack resistance, micro expansion, shrinkage compensation and the like are achieved; the application of the mixed fiber penetrates through and is bridged in the geopolymer repair mortar network structure from a macroscopic layer, and the effects of crack resistance, toughening, bonding strength improvement and the like are achieved; the application of the water-retaining thickener ensures that the reclaimed ceramic powder geopolymer repair mortar has good workability, prevents the phenomena of particle stratification, sedimentation and the like, and ensures the construction performance and the construction quality; the setting time is adjusted, the early strength is improved, the construction efficiency is improved and the like while the water-cement ratio is reduced by applying the retarding water reducer and the early strength agent to improve the strength of the repair mortar; moreover, the regenerated ceramic powder geopolymer repair mortar can be fully bonded and adhered with a damaged joint surface, and alkali-activated reaction is generated, so that the repair quality of a damaged part is improved. Compared with the prior art, the adhesive has the technical advantages of better interface compatibility, good bonding strength, no shrinkage and micro-expansion, good mechanical property, high temperature resistance, crack resistance and the like, and also has the economic and policy advantages of low cost, low carbon, environmental protection and the like.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The reclaimed ceramic powder geopolymer repair mortar is characterized by comprising the following components in parts by weight: 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 0.1-1 part of carbon nano tube, 1-5 parts of nano magnesium oxide, 10-35 parts of iron tailing sand, 0.2-1 part of mixed fiber, 12-35 parts of alkaline activator, 0.4-1.2 parts of retarding water reducer, 0.3-5 parts of water retention thickener and 0.8-3 parts of early strength agent.
2. The regenerative ceramic powder geopolymer repair mortar of claim 1, wherein the carbon nanotubes are formed by compounding multiwalled carbon nanotubes and a carbon nanotube dispersant, the multiwalled carbon nanotubes account for 70-90% by weight, and the carbon nanotube dispersant accounts for 10-30% by weight; the tube diameter of the multi-wall carbon nano tube is 10-50nm, the length is 5-20 mu m, and the specific surface area is 50000-250000m2/kg。
3. The reclaimed ceramic powder geopolymer repair mortar as claimed in claim 1, wherein the reclaimed ceramic powder is prepared from wall tiles, floor tiles or household ceramic wastes by the steps of crushing by a jaw crusher, washing and selecting, and ball milling to obtain powder, the particle diameter is 325-800 meshes, the specific surface area is 350-500m2/kg。
4. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the water-retaining thickener is prepared by mixing 35-60% of organic bentonite, 20-45% of redispersible latex powder and 20-30% of water-soluble polyamide wax in percentage by weight.
5. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the mixed fiber is formed by mixing 35 to 55 weight percent of basalt chopped fiber, 25 to 45 weight percent of stainless steel powder chopped fiber and 15 to 35 weight percent of polyvinyl alcohol fiber; the basalt chopped fiber has the average length of 3-4mm, the diameter of 10-20 mu m and the monofilament tensile strength of 2000-4500 MPa; the stainless steel powder short fiber is an alloy material, the average length is 2-3mm, the diameter is 5-10 mu m, and the monofilament tensile strength is 1500-2000 Mpa; the polyvinyl alcohol fiber has the average length of 3-5mm, the diameter of 1-5 μm and the tensile strength of 500-1500 MPa.
6. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the iron tailings are prepared from solid wastes discharged after concentrate selection from iron ore through the processes of re-crushing, grinding and water washing concentration, and the particle size fraction is 50-70% by weight for 20-40 meshes and 30-50% by weight for 40-70 meshes.
7. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the set-retarding water-reducing agent is prepared by compounding monopotassium phosphate, sodium gluconate and a polycarboxylate water-reducing agent, wherein the monopotassium phosphate is 0.5-2% by weight, the sodium gluconate is 0.5-2% by weight, and the polycarboxylate water-reducing agent is 96-99% by weight.
8. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the early strength agent is prepared by compounding 40-60% of triethanolamine, 20-30% of ethylene glycol and 15-30% of calcium formate according to the weight ratio.
9. The reclaimed ceramic powder geopolymer repair mortar of claim 1, wherein the nano magnesia is prepared by a hydrothermal precipitation method comprising the following steps: adding a precipitator into the magnesium salt aqueous solution, uniformly stirring, and finally preparing the nano magnesium oxide through the processes of hydrothermal reaction, washing, filtering, drying, grinding and calcining decomposition; the average particle diameter of the nano-magnesia is 10-70nm, the specific surface area is 35000-120000m2/kg。
10. The method for preparing a recycled ceramic powder geopolymer repair mortar of any one of claims 1 to 9, comprising the steps of:
s1), firstly, determining the water-material ratio to be 0.13-0.16, accurately weighing 12-35 parts of alkaline exciting agent, 0.8-3 parts of early strength agent and 1/5 parts of total water consumption, putting into a stirrer together, stirring at high speed for 1-3min until the mixture is uniform, and cooling to room temperature to obtain a mixed solution A for later use;
s2) then accurately weighing 30-55 parts of regenerated ceramic powder, 15-20 parts of slag powder, 5-10 parts of phosphogypsum, 10-35 parts of iron tailing sand, 0.3-5 parts of water retention thickener, 0.2-1 part of mixed fiber, 0.4-1.2 parts of retarding water reducer, 0.1-1 part of carbon nano tube and 1-5 parts of nano magnesium oxide, putting the materials into a low-speed stirrer, and dry-stirring for 2-3min to be uniform, then throwing 4/5 of total water consumption, and continuing stirring for 2-3min to be uniform to obtain mixed liquid B for later use;
s3), finally, putting the mixed solution A and the mixed solution B into a stirrer together, stirring for 2-3min until the mixed solution A and the mixed solution B are uniform, putting the mixed solution A and the mixed solution B into a mortar test mold, and curing and forming to obtain the regenerated ceramic powder geopolymer repair mortar.
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