CN115246729A - Crack-resistant and seepage-proof dry-mixed plastering mortar and processing technology thereof - Google Patents
Crack-resistant and seepage-proof dry-mixed plastering mortar and processing technology thereof Download PDFInfo
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- CN115246729A CN115246729A CN202210945586.3A CN202210945586A CN115246729A CN 115246729 A CN115246729 A CN 115246729A CN 202210945586 A CN202210945586 A CN 202210945586A CN 115246729 A CN115246729 A CN 115246729A
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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
- C04B28/02—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
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation 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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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses anti-cracking and anti-seepage dry-mixed plastering mortar and a processing technology thereof. The crack-resistant and seepage-proof dry-mixed plastering mortar is prepared from portland cement, fly ash, bentonite, desulfurized gypsum, slag powder, hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound. The prepared dry-mixed plastering mortar has good crack resistance and seepage resistance and long service life, and meets the requirement of the mortar on industrial application.
Description
Technical Field
The invention relates to the technical field of mortar, in particular to anti-cracking and anti-seepage dry-mixed plastering mortar and a processing technology thereof.
Background
The dry-mixed plastering mortar is a material which has wide source and is convenient for construction, and is widely applied to building engineering. With the use of a large amount of mortar, the mortar also has a plurality of defects, the anti-cracking and anti-seepage performance of the mortar is not good, and a plurality of problems are easy to occur in the long-term use of the mortar, so that the construction is influenced. In order to solve the problems, the mortar is provided with anti-cracking and anti-seepage performance by adding substances such as fibers and the like into the mortar, but too much fiber is added to cause a plurality of problems, such as the fibers are easy to agglomerate in materials to influence the use of the mortar.
In order to solve the problems, the invention provides an anti-cracking and anti-seepage dry-mixed plastering mortar and a processing technology thereof.
Disclosure of Invention
The invention aims to provide an anti-cracking and anti-seepage dry-mixed plastering mortar and a processing technology thereof, and aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a processing technology of crack-resistant and seepage-proof dry-mixed plastering mortar comprises the following steps:
the method comprises the following steps: taking the polypropylene fiber-carbon nanotube composite and deionized water, carrying out ultrasonic dispersion for 5-10min, adding hexamethyldisilazane, and stirring at 35-40 ℃ for 1-2h to obtain a modified polypropylene fiber-carbon nanotube composite;
step two: the method comprises the steps of uniformly mixing cement, fly ash, bentonite, desulfurized gypsum and slag powder, drying at 40-50 ℃ for 30-60min, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and uniformly mixing to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
Preferably, the dry-mixed plastering mortar comprises the following components: according to weight, 20-30 parts of cement, 10-15 parts of fly ash, 1-2 parts of bentonite, 1-4 parts of desulfurized gypsum, 5-10 parts of slag powder, 0.2-0.6 part of hydroxypropyl methyl cellulose ether, 0.5-0.7 part of EVA latex powder, 1-3 parts of water reducing agent and 6-8 parts of modified polypropylene fiber-carbon nanotube composite.
Preferably, the cement is portland cement with a strength grade of 52.5.
Preferably, the water reducing agent is lignosulfonate.
Preferably, the preparation method of the polypropylene fiber-carbon nanotube composite comprises the following steps: taking concentrated sulfuric acid and concentrated nitric acid, mixing uniformly, adding the carbon nano tube, mixing uniformly, refluxing for 2.5-3.5h at 55-65 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; uniformly mixing the carboxylated carbon nanotubes, the polypropylene fiber coated with the silicon dioxide and the deionized water, stirring for 12-14h, filtering, washing and drying to obtain the polypropylene fiber-carbon nanotube composite.
Preferably, the preparation method of the polypropylene fiber coated with the silicon dioxide comprises the following steps: taking polypropylene fiber, ethanol, deionized water and hexadecyl trimethyl ammonium bromide, carrying out ultrasonic dispersion for 40-60min, dropwise adding ammonia water, carrying out ultrasonic dispersion for 40-60min, dropwise adding tetraethoxysilane, stirring for 10-12h at 42-48 ℃, adding tannic acid, reacting for 2-4h, centrifuging, washing, and drying for 4-5h at 50-60 ℃ to obtain the silica-coated polypropylene fiber.
Preferably, the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide is 0.1: (4-6).
Compared with the prior art, the invention has the following beneficial effects:
(1) The polypropylene fiber has good toughness, high strength and good chemical resistance, and can bear certain tensile stress when being added into dry-mixed plastering mortar, prevent mortar from settling and prevent mortar from generating cracks. The silica can be well filled into the pores of the mortar, the impermeability and the mechanical strength of the mortar are improved, the polypropylene fibers are coated with the silica, and the tannin is added, so that the specific surface area of the silica is larger, more polypropylene fibers can be grafted, and the impermeability and the crack resistance of the mortar are greatly improved.
(2) The silicon dioxide is easy to agglomerate, and the problem that the performance of the mortar is influenced by the easy agglomeration of the silicon dioxide is solved by loading the silicon dioxide on the carboxylated carbon nanotube. However, when the silicon dioxide with high specific surface area is added into the dry-mixed plastering mortar, more free water can be adsorbed, so that the lubricating effect of water is reduced, and the friction is enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 50min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 50min, dropwise adding 20mL of tetraethoxysilane, stirring for 11h at 46 ℃, adding 1g of tannic acid, reacting for 3h, centrifuging, washing, and drying for 4.5h at 55 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of 98% concentrated sulfuric acid and 25mL of 65% concentrated nitric acid, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3h at 60 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 5g of polypropylene fiber coated with silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 13h, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:5.
step three: preparing a modified polypropylene fiber-carbon nanotube compound:
and (3) taking 3g of polypropylene fiber-carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 7min, adding 5mL of hexamethyldisilazane, and stirring at 37 ℃ for 1.5h to obtain the modified polypropylene fiber-carbon nanotube composite.
Step four: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of water reducing agent and 7 parts of modified polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the mons monster china cement plant, cat no: PO 52.5.
Example 2
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 40min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 40min, dropwise adding 20mL of tetraethoxysilane, stirring for 10h at 42 ℃, adding 1g of tannic acid, reacting for 2h, centrifuging, washing, and drying for 4h at 50 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of concentrated sulfuric acid with the mass fraction of 98% and 25mL of concentrated nitric acid with the mass fraction of 65%, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 2.5 hours at 55 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 4g of polypropylene fiber coated with silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 12h, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:4.
step three: preparing a modified polypropylene fiber-carbon nanotube compound:
and (3) taking 3g of polypropylene fiber-carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 5min, adding 5mL of hexamethyldisilazane, and stirring at 35 ℃ for 1h to obtain the modified polypropylene fiber-carbon nanotube composite.
Step four: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 30min at 40 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the anti-cracking and anti-seepage dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 20 parts of portland cement, 10 parts of fly ash, 1 part of bentonite, 1 part of desulfurized gypsum, 5 parts of slag powder, 0.2 part of hydroxypropyl methyl cellulose ether, 0.5 part of EVA latex powder, 1 part of water reducing agent and 6 parts of modified polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Example 3
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, carrying out ultrasonic dispersion for 60min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, carrying out ultrasonic dispersion for 60min, dropwise adding 20mL of tetraethoxysilane, stirring for 12h at 48 ℃, adding 1g of tannic acid, reacting for 4h, centrifuging, washing, and drying for 5h at 60 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of 98% concentrated sulfuric acid and 25mL of 65% concentrated nitric acid, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3.5h at 65 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 6g of polypropylene fiber coated with silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 14h, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:6.
step three: preparing a modified polypropylene fiber-carbon nanotube compound:
taking 3g of the polypropylene fiber-carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 10min, adding 5mL of hexamethyldisilazane, and stirring at 40 ℃ for 2h to obtain the modified polypropylene fiber-carbon nanotube composite.
Step four: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 60min at 50 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 30 parts of portland cement, 15 parts of fly ash, 2 parts of bentonite, 4 parts of desulfurized gypsum, 10 parts of slag powder, 0.6 part of hydroxypropyl methyl cellulose ether, 0.7 part of EVA latex powder, 3 parts of a water reducing agent and 8 parts of a modified polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Example 4: the same procedure as in example 1 was repeated except that the polypropylene fibers were not coated with silica.
The method comprises the following steps: preparation of silica-carbon nanotube composites
Taking 60mL of 98% concentrated sulfuric acid and 25mL of 65% concentrated nitric acid, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3h at 60 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 5g of silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 13 hours, filtered, washed and dried to obtain the silicon dioxide-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the silicon dioxide to be 0.1:5.
step two: preparing a modified silicon dioxide-carbon nanotube compound:
and (3) taking 3g of the carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 7min, adding 5mL of hexamethyldisilazane, and stirring at 37 ℃ for 1.5h to obtain the modified silicon dioxide-carbon nanotube composite.
Step three: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent, a modified silicon dioxide-carbon nanotube compound and polypropylene fiber, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight parts, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of a water reducing agent, 5 parts of a modified polypropylene fiber-carbon nanotube composite and 2 parts of polypropylene fiber.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Example 5: the same procedure as in example 1 was repeated except that no tannic acid was added.
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 50min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 50min, dropwise adding 20mL of tetraethoxysilane, stirring for 11h at 46 ℃, centrifuging, washing, and drying for 4.5h at 55 ℃ to obtain the silicon dioxide coated polypropylene fiber.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of 98% concentrated sulfuric acid and 25mL of 65% concentrated nitric acid, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3h at 60 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 5g of polypropylene fiber coated with silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 13h, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:5.
step three: preparing a modified polypropylene fiber-carbon nanotube compound:
and (3) taking 3g of polypropylene fiber-carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 7min, adding 5mL of hexamethyldisilazane, and stirring at 37 ℃ for 1.5h to obtain the modified polypropylene fiber-carbon nanotube composite.
Step four: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of water reducing agent and 7 parts of modified polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Example 6: the procedure of example 1 was repeated except that no carbon nanotubes were added.
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 50min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 50min, dropwise adding 20mL of tetraethoxysilane, stirring for 11h at 46 ℃, adding 1g of tannic acid, reacting for 3h, centrifuging, washing, and drying for 4.5h at 55 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of modified silica-coated polypropylene fiber:
and (3) taking 3g of polypropylene fiber coated with silicon dioxide and 200mL of deionized water, carrying out ultrasonic dispersion for 7min, adding 5mL of hexamethyldisilazane, and stirring at 37 ℃ for 1.5h to obtain the modified polypropylene fiber coated with silicon dioxide.
Step three: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and modified silicon dioxide-coated polypropylene fiber, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight parts, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of a water reducing agent and 7 parts of modified silica-coated polypropylene fiber.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Example 7: the procedure of example 1 was repeated except that hexamethyldisilazane was not added.
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 50min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 50min, dropwise adding 20mL of tetraethoxysilane, stirring for 11h at 46 ℃, adding 1g of tannic acid, reacting for 3h, centrifuging, washing, and drying for 4.5h at 55 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of concentrated sulfuric acid with the mass fraction of 98% and 25mL of concentrated nitric acid with the mass fraction of 65%, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3 hours at 60 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotube, 5g of polypropylene fiber coated with silicon dioxide and 10mL of deionized water are uniformly mixed, stirred for 13h, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:5.
step three: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of water reducing agent and 7 parts of polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the mons monster china cement plant, cat no: PO 52.5.
Example 8: controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:10, the rest was the same as in example 1.
The method comprises the following steps: polypropylene fiber coated with silicon dioxide
Taking 5g of polypropylene fiber, 500mL of ethanol, 100mL of deionized water and 3g of hexadecyl trimethyl ammonium bromide, ultrasonically dispersing for 50min, dropwise adding 20mL of ammonia water with the mass fraction of 28%, ultrasonically dispersing for 50min, dropwise adding 20mL of tetraethoxysilane, stirring for 11h at 46 ℃, adding 1g of tannic acid, reacting for 3h, centrifuging, washing, and drying for 4.5h at 55 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
Step two: preparation of polypropylene fiber-carbon nanotube composite
Taking 60mL of concentrated sulfuric acid with the mass fraction of 98% and 25mL of concentrated nitric acid with the mass fraction of 65%, uniformly mixing, adding 0.1g of carbon nano tube, uniformly mixing, refluxing for 3 hours at 60 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; 0.1g of carboxylated carbon nanotubes, 10g of silica-coated polypropylene fibers and 10mL of deionized water are uniformly mixed, stirred for 13 hours, filtered, washed and dried to obtain the polypropylene fiber-carbon nanotube composite.
Controlling the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide to be 0.1:10.
step three: preparing a modified polypropylene fiber-carbon nanotube compound:
and (3) taking 3g of polypropylene fiber-carbon nanotube composite and 200mL of deionized water, carrying out ultrasonic dispersion for 7min, adding 5mL of hexamethyldisilazane, and stirring at 37 ℃ for 1.5h to obtain the modified polypropylene fiber-carbon nanotube composite.
Step four: taking portland cement, fly ash, bentonite, desulfurized gypsum and slag powder, mixing uniformly, drying for 50min at 45 ℃, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and mixing uniformly to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
The dry-mixed plastering mortar comprises the following components: according to the weight, 25 parts of portland cement, 13 parts of fly ash, 1.5 parts of bentonite, 3 parts of desulfurized gypsum, 7 parts of slag powder, 0.4 part of hydroxypropyl methyl cellulose ether, 0.6 part of EVA latex powder, 2 parts of water reducing agent and 7 parts of modified polypropylene fiber-carbon nanotube composite.
Portland cement was purchased from the caruncle midwife cement plant, cat no: PO 52.5.
Experiment:
the dry-mixed plastering mortar prepared in examples 1 to 8 was subjected to a performance test, a sample of 40 × 40 × 160mm was prepared and subjected to a shrinkage test according to JGJ/T70-2009, a sample of 30mm in height, 70mm in upper opening diameter and 80mm in lower opening diameter was prepared and subjected to an anti-bleeding test according to JGJ/T70-2009, and a microcomputer servo anti-bending and anti-compression testing machine was used to test the strength, and the obtained data are shown in the following table:
and (4) conclusion: as can be seen from the comparison of the data in the table, in example 4, the performance of the mortar is reduced to some extent because the polypropylene is not uniformly dispersed without coating the polypropylene fibers with the silica. Example 5 no tannic acid was added and the grafted polypropylene fibers were less and adversely affected the mortar properties. In example 6, carbon nanotubes are not added, and the polypropylene fibers coated with silicon dioxide are easy to agglomerate, so that the crack resistance and seepage prevention of the mortar are greatly influenced. In example 7, hexamethyldisilazane is not added, and the polypropylene fiber-carbon nanotube composite is not subjected to hydrophobic modification, so that the polypropylene fiber-carbon nanotube composite can absorb excessive free water, thereby affecting the use performance of the mortar. In example 8, the mortar performance was also affected by a small amount of the carboxylated carbon nanotube.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A processing technology of crack-resistant and seepage-proof dry-mixed plastering mortar is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: taking the polypropylene fiber-carbon nanotube composite and deionized water, carrying out ultrasonic dispersion for 5-10min, adding hexamethyldisilazane, and stirring at 35-40 ℃ for 1-2h to obtain a modified polypropylene fiber-carbon nanotube composite;
step two: the method comprises the steps of uniformly mixing cement, fly ash, bentonite, desulfurized gypsum and slag powder, drying at 40-50 ℃ for 30-60min, grinding, adding hydroxypropyl methyl cellulose ether, EVA latex powder, a water reducing agent and a modified polypropylene fiber-carbon nanotube compound, and uniformly mixing to obtain the crack-resistant and seepage-proof dry-mixed plastering mortar.
2. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 1, which is characterized in that: the dry-mixed plastering mortar comprises the following components: according to weight, 20-30 parts of cement, 10-15 parts of fly ash, 1-2 parts of bentonite, 1-4 parts of desulfurized gypsum, 5-10 parts of slag powder, 0.2-0.6 part of hydroxypropyl methyl cellulose ether, 0.5-0.7 part of EVA latex powder, 1-3 parts of water reducing agent and 6-8 parts of modified polypropylene fiber-carbon nanotube composite.
3. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 2, which is characterized in that: the cement is portland cement with a strength grade of 52.5.
4. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 2, which is characterized in that: the water reducing agent is lignosulfonate.
5. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 1, which is characterized in that: the preparation method of the polypropylene fiber-carbon nanotube composite comprises the following steps: taking concentrated sulfuric acid and concentrated nitric acid, mixing uniformly, adding the carbon nano tube, mixing uniformly, refluxing for 2.5-3.5h at 55-65 ℃, centrifuging, washing and drying to obtain a carboxylated carbon nano tube; uniformly mixing the carboxylated carbon nanotubes, the polypropylene fiber coated with the silicon dioxide and the deionized water, stirring for 12-14h, filtering, washing and drying to obtain the polypropylene fiber-carbon nanotube composite.
6. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 5, which is characterized in that: the preparation method of the polypropylene fiber coated with the silicon dioxide comprises the following steps: taking polypropylene fiber, ethanol, deionized water and hexadecyl trimethyl ammonium bromide, carrying out ultrasonic dispersion for 40-60min, dropwise adding ammonia water, carrying out ultrasonic dispersion for 40-60min, dropwise adding ethyl orthosilicate, stirring for 10-12h at 42-48 ℃, adding tannic acid, reacting for 2-4h, centrifuging, washing, and drying for 4-5h at 50-60 ℃ to obtain the polypropylene fiber coated with silicon dioxide.
7. The processing technology of the crack-resistant and seepage-resistant dry-mixed plastering mortar of claim 5, which is characterized in that: the mass ratio of the carboxylated carbon nanotubes to the polypropylene fibers coated with the silicon dioxide is 0.1: (4-6).
8. An anti-crack and anti-seepage dry-mixed plastering mortar processed by the processing technology of the anti-crack and anti-seepage dry-mixed plastering mortar according to any one of claims 1 to 7.
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