CN114933456A - High-ductility waterproof anti-cracking composite mortar and preparation method thereof - Google Patents
High-ductility waterproof anti-cracking composite mortar and preparation method thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 92
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005336 cracking Methods 0.000 title claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000000835 fiber Substances 0.000 claims abstract description 67
- 239000000843 powder Substances 0.000 claims abstract description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 27
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 26
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000000839 emulsion Substances 0.000 claims abstract description 22
- 239000006004 Quartz sand Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000243 solution Substances 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 239000005871 repellent Substances 0.000 claims abstract description 18
- 230000002940 repellent Effects 0.000 claims abstract description 18
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims abstract description 16
- 239000004137 magnesium phosphate Substances 0.000 claims abstract description 16
- 229960002261 magnesium phosphate Drugs 0.000 claims abstract description 16
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims abstract description 16
- 235000010994 magnesium phosphates Nutrition 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims abstract description 16
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 34
- -1 polypropylene Polymers 0.000 claims description 28
- 239000004743 Polypropylene Substances 0.000 claims description 27
- 229920001155 polypropylene Polymers 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 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 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical class C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 4
- HXOGQBSDPSMHJK-UHFFFAOYSA-N triethoxy(6-methylheptyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCCCC(C)C HXOGQBSDPSMHJK-UHFFFAOYSA-N 0.000 claims description 4
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- HDFXRQJQZBPDLF-UHFFFAOYSA-L disodium hydrogen carbonate Chemical compound [Na+].[Na+].OC([O-])=O.OC([O-])=O HDFXRQJQZBPDLF-UHFFFAOYSA-L 0.000 claims description 2
- 235000019253 formic acid Nutrition 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 2
- 239000012498 ultrapure water Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 abstract description 4
- 229910010272 inorganic material Inorganic materials 0.000 abstract description 4
- 239000011147 inorganic material Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000007580 dry-mixing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 5
- 239000004567 concrete Substances 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000005372 silanol group Chemical group 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012412 chemical coupling Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011414 polymer cement Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003313 weakening effect Effects 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2069—Self-cleaning materials, e.g. using lotus effect
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- 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 the technical field of mortar, in particular to high-ductility waterproof anti-crack composite mortar and a preparation method thereof; the water-reducing agent comprises the following raw materials of 28-42 parts of cement, 20-30 parts of mineral powder, 20-35 parts of silica fume, 40-60 parts of quartz sand, 10-20 parts of fiber, 8-15 parts of magnesium phosphate whisker, 8-16 parts of carbon quantum dot solution, 0.8-1.2 parts of ethylene-vinyl acetate copolymer emulsion, 0.5-0.9 part of water reducing agent, 0.4-0.7 part of hydrophobic agent and 30-40 parts of water; firstly, dry-mixing and uniformly mixing partial inorganic materials, then uniformly dispersing fibers, magnesium phosphate whiskers, a carbon quantum dot solution, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent, a water repellent and water, and mixing dry powder and a mixed solution again; the porosity of the cured mortar can be reduced, so that the surface of the cured mortar is smooth and uniform, the particle density is high, the impermeability of the cured mortar is improved, the waterproof performance of the mortar is improved, the ductility, the crack resistance and the strength of the mortar are enhanced, and the mechanical property is stable.
Description
Technical Field
The invention relates to the technical field of mortar, in particular to high-ductility waterproof anti-cracking composite mortar and a preparation method thereof.
Background
The cement mortar is widely applied to building engineering as a common building material, and the engineering demand is large. However, the conventional cement-based material is a quasi-brittle material, has the disadvantages of low breaking strength and tensile strength, large brittleness, easy cracking and the like, and is often combined with reinforcing steel bars to form concrete so as to increase the strength of the concrete in order to fully utilize the advantages of the cement-based material. With the requirement on engineering speed and the development requirement of high-rise buildings, the on-site mixing mode is not suitable for the development requirement of cement-based materials, and the cement-based materials are often premixed into mortar and then transported to a construction site to be mixed with reinforcing steel bars. The quality of the mortar affects the strength and performance of buildings, and the requirements of high-span bridges and pavements on the mortar not only need better mechanical strength, but also need higher ductility, are not easy to crack and have good outer surface waterproof effect.
However, the existing mortar still has many problems, such as the increase of mortar shrinkage, wall cracking, serious leakage and easy hollowing and cracking; and the addition of common waterproof agent results in poor waterproof performance.
Disclosure of Invention
The invention aims to provide high-ductility waterproof anti-cracking composite mortar and a preparation method thereof, which can reduce the porosity of the mortar after curing, ensure that the surface of the mortar after curing is smooth and uniform, have high particle density, improve the anti-permeability performance of the mortar after curing, facilitate the improvement of the waterproof performance of the mortar, enhance the ductility, the anti-cracking performance and the strength of the mortar, and have stable mechanical properties.
In order to achieve the purpose, the invention provides the following technical scheme:
the high-ductility waterproof anti-crack composite mortar comprises the following raw materials in parts by mass: 28-42 parts of cement, 20-30 parts of mineral powder, 20-35 parts of silica fume, 40-60 parts of quartz sand, 10-20 parts of fiber, 8-15 parts of magnesium phosphate whisker, 8-16 parts of carbon quantum dot solution, 0.8-1.2 parts of ethylene-vinyl acetate copolymer emulsion, 0.5-0.9 part of water reducing agent, 0.4-0.7 part of water repellent and 30-40 parts of water;
the preparation method of the high-ductility waterproof anti-crack composite mortar comprises the following steps:
the method comprises the following steps: pouring cement, mineral powder, silica fume and quartz sand in parts by weight into a stirrer, setting the stirring speed to be 200-300 r/min, and performing dry stirring for 3-5 min to obtain uniformly mixed dry powder;
step two: adding water in parts by weight into fibers and magnesium phosphate whiskers in parts by weight, stirring, uniformly dispersing, adding a carbon quantum dot solution in parts by weight, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent and a water repellent in parts by weight, and stirring at 200-300 r/min for 20-30 min to obtain a mixed solution;
step three: and (3) adding the mixed solution obtained in the step (II) into the dry powder obtained in the step (I), stirring and adding at 200-300 r/min, after the adding is finished, wet stirring for 5-10 min, and uniformly mixing to obtain the high-ductility waterproof anti-cracking composite mortar.
Preferably, the cement is portland cement above 42.5 designation; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 18-24%.
Preferably, the mineral powder is granulated blast furnace slag powder of manganese ore and iron ore, wherein the mass ratio of the granulated blast furnace slag powder of the manganese ore to the granulated blast furnace slag powder of the iron ore is 1: 1, according to the standard GB/T18046-2000, the grade of the mineral powder is S105.
Preferably, the fineness of the quartz sand is 80 meshes and 200 meshes, and the mass ratio of the 80-mesh quartz sand to the 200-mesh quartz sand is 1: 2 to 3.
Preferably, the fiber has a fiber length shorter than 3mm and a diameter smaller than 2mm, and is a mixture of modified polypropylene fiber and modified PE fiber, and the mass ratio of the modified polypropylene fiber: modified PE fiber = 1-2: 1.
preferably, the modified polypropylene fiber is prepared by putting the polypropylene fiber into a container, adding absolute ethyl alcohol with the same mass to completely soak the polypropylene fiber, wherein the soaking time is 10-12 h, transferring the polypropylene fiber into a 50 ℃ oven to be dried to constant weight, weighing gamma-aminopropyltriethoxysilane with the mass of 0.1-0.5 time of that of the polypropylene fiber, adding deionized water with the same mass as that of the gamma-aminopropyltriethoxysilane, absolute ethyl alcohol with the mass of 6-9 times of that of the gamma-aminopropyltriethoxysilane, 400W power, performing ultrasonic dispersion in a 60 ℃ water bath for 20-30 min, standing for 2-3 h, filtering, washing with deionized water for 2-3 times, transferring the polypropylene fiber into a 60 ℃ oven to be dried to constant weight to obtain the modified polypropylene fiber;
preferably, the modified PE fiber is prepared in the same manner as the modified polypropylene fiber.
Preferably, the carbon quantum dot solution is an aqueous solution of carbon quantum dots, a certain amount of carbon quantum dots are taken, ultrapure water with the mass being 20-25 times that of the carbon quantum dots is added, and the mixture is subjected to 400W power ultrasonic treatment for 3-5 min to obtain a uniform mixed solution, namely the carbon quantum dot solution.
Preferably, the ethylene-vinyl acetate copolymer emulsion is prepared by taking 5 parts by mass of nano SiO 2 Adding 95 parts by mass of absolute ethyl alcohol, and performing ultrasonic dispersion for 1 hour to ensure that the nano SiO is obtained 2 Uniformly dispersing, adjusting the pH value to 4-5 by using formic acid, and adding 5 parts by weight of gamma-methyl propyleneReacting acyloxy propyl trimethoxy silane in water bath at the temperature of 80-90 ℃ for 10-12 h, stirring at the speed of 60-80 r/min in the reaction process, adjusting the pH to be neutral by using disodium hydrogen carbonate after reaction, and quickly filtering to obtain the gamma-methacryloxy propyl trimethoxy silane modified nano SiO 2 Adding 30 parts by mass of absolute ethyl alcohol, uniformly dispersing by ultrasonic, adding the mixture into an ethylene-vinyl acetate copolymer, and modifying the gamma-methacryloxypropyltrimethoxysilane by using the nano SiO 2 The mass ratio of the absolute ethyl alcohol mixed solution to the ethylene-vinyl acetate copolymer is 2-3: 50, stirring for 12 hours at the speed of 80-100 r/min to obtain the nano SiO 2 Modified ethylene-vinyl acetate copolymer emulsion.
Preferably, the water repellent is prepared from isooctyl triethoxysilane, graphene oxide and tetraethyl orthosilicate in a mass ratio of 3-5: 2-3: 1 are mixed.
The invention has the beneficial effects that:
1. the preparation method comprises the steps of compounding fibers and magnesium phosphate whiskers with cement, mineral powder, silica fume and quartz sand to enhance ductility of mortar and enhance crack resistance of the mortar after curing, adding ethylene-vinyl acetate copolymer emulsion in a compounding process, weakening thermal shrinkage degree of the mortar after curing by utilizing thermal expansion performance of the ethylene-vinyl acetate copolymer emulsion after curing, and further enhancing crack resistance of the mortar after curing, adding a water reducing agent in the compounding process to reduce use of water and facilitate transportation of the mortar, adding a carbon quantum dot solution and a water repellent in the compounding process, wherein the zero-dimensional carbon quantum dots can enhance strength and impermeability of the mortar, and improving waterproof performance of the mortar after curing by matching with the water repellent.
2. The fiber is a mixture of polypropylene fiber and PE fiber, the polypropylene fiber and the PE fiber are modified by gamma-aminopropyltriethoxysilane to obtain the modified polypropylene fiber and PE fiber, the surface of the smooth polypropylene fiber and PE fiber is modified, so that the polypropylene fiber and the PE fiber are not easy to agglomerate, the dispersibility of the polypropylene fiber and the PE fiber in water or mortar is improved, the uniform dispersion in the mortar is facilitated, the function of the fiber is fully utilized, and the reinforcement function of the fiber on the ductility and the crack resistance of the mortar is ensured. The polypropylene fibers and the PE fibers are mixed to dope the mortar together, the PE fibers have higher molecular weight and chain-shaped molecular structure, have better extensibility, and can further enhance the ductility of the mortar by matching with the polypropylene fibers.
3. The magnesium phosphate crystal whisker is in a whisker shape, has an inorganic substance and good compatibility with other inorganic materials in the mortar, and is beneficial to the compatibility and stability of the materials in the mortar. The organic polypropylene fiber and the PE fiber are matched with the inorganic magnesium phosphate whisker, after the mortar is cured, a three-dimensional network structure can be formed in the material, the bending toughness of the mortar after the mortar is cured can be enhanced, the improvement of ductility is facilitated, the fiber and the whisker are used, the shrinkage of the fiber and the whisker is inhibited in the mortar curing process, the dry shrinkage cracking resistance of the mortar is improved, and the generation of cracks is effectively prevented.
4. The use of the mineral powder, the silica fume and the quartz sand can reduce the consumption of cement to a certain extent and save the production cost, in addition, because the mineral powder, the silica fume, the quartz sand and the cement have different particle sizes, and after the mineral powder, the silica fume, the quartz sand and the cement are uniformly mixed, substances with different particle sizes are mutually matched, mutually filled and supported, thereby being beneficial to improving the integral strength, in addition, the mineral powder is granulated blast furnace slag powder of manganese ore and iron ore, contains a small amount of metal substances, has high strength and hardness, and is beneficial to improving the strength and hardness of the solidified mortar.
5. The carbon quantum dot solution contains nanoscale zero-dimensional carbon quantum dots, consists of amorphous and crystalline carbon cores, is added in a proper amount, and in the hydration process and the hardening process of cement, through the water adsorption of the carbon quantum dots and the transportation effect of water molecules in pores, the hydration speed of the cement is increased, the hardening speed is reduced, the hydration and hardening processes of cement mortar are favorably balanced, the hydration and hardening time of the cement mortar is proper, the stability of the mechanical property of the solidified mortar is favorably realized, and the improvement of the compressive strength of the solidified mortar is favorably realized; in addition, the nano-scale carbon quantum dots are distributed in gaps of mortar cement to play a filling role, so that the compactness of a cement structure is increased, the mechanical property is improved, the porosity of the solidified mortar is reduced, the surface of the solidified mortar is smooth and uniform, the particle density is high, a result similar to a lotus leaf effect is finally formed on the surface of the solidified mortar, the impermeability of the solidified mortar is improved, and the waterproof property of the mortar is improved.
6. The ethylene-vinyl acetate copolymer emulsion is nano SiO 2 The modified ethylene-vinyl acetate copolymer emulsion can expand to a certain degree when heated, is opposite to the property of the cured conventional silicate cement mortar that the mortar shrinks when heated, can compensate the shrinkage of the conventional silicate cement mortar after being cured, reduces the shrinkage degree, and further can improve the crack resistance of the mortar; gamma-methacryloxypropyltrimethoxysilane modified nano SiO 2 Then the nano SiO is firstly modified by gamma-methacryloxypropyltrimethoxysilane 2 The modified ethylene-vinyl acetate copolymer emulsion has good compatibility with inorganic materials in mortar, and is beneficial to stabilizing and improving the mechanical property of the mortar.
7. The water reducing agent is a polycarboxylic acid water reducing agent, has good compatibility with various cements, good slump retention performance of concrete, long construction time of the concrete and high alkali water rate, and in addition, the polycarboxylic acid water reducing agent has low mixing amount, high water reducing rate, small shrinkage and low alkali content and is beneficial to the durability of the concrete. The water reducing agent is used, so that the water content in the mortar is reduced, the mortar is convenient to transport and use, the water is saved, the energy is saved in the transportation or conveying process, and the production and transportation cost is reduced.
8. The water repellent is formed by mixing isooctyl triethoxysilane, graphene oxide and tetraethyl orthosilicate, tetraethyl orthosilicate can generate hydrolysis reaction with water to generate active silanol groups, the active silanol groups can generate chemical coupling effect with OH groups on the surfaces of cement mortar particles, and condensation reaction can also be generated to form a net-shaped cross-linked structure, isooctyl triethoxysilane can be firmly combined with inorganic organic matters in raw materials, graphene oxide silane is layered carbon and is hydrophobic, the mixed water repellent has certain hydrophobic effect, a hydrophobic and breathable layer can be constructed in the mortar and on the surface of the mortar, so that a certain ball effect can be generated when water drops on the mortar, a waterproof layer with a waterproof function is formed on the surface of the material after the mortar is solidified, and the improvement of the waterproof performance of the mortar is facilitated.
9. The method comprises the steps of firstly mixing most inorganic materials uniformly in a dry mode, uniformly dispersing fibers, magnesium phosphate whiskers, a carbon quantum dot solution, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent and a water repellent with water, and mixing the dry powder and the mixed solution again, so that the raw materials can be uniformly mixed in all the substances to form the mortar with uniform components, and the stability of the overall performance of the mortar is facilitated.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood 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 obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1
The high-ductility waterproof anti-cracking composite mortar comprises the following raw materials in parts by mass: 28 parts of cement, 20 parts of mineral powder, 20 parts of silica fume, 40 parts of quartz sand, 10 parts of fiber, 8 parts of magnesium phosphate whisker, 8 parts of carbon quantum dot solution, 0.8 part of ethylene-vinyl acetate copolymer emulsion, 0.5 part of water reducing agent, 0.4 part of water repellent and 30 parts of water;
the preparation method of the high-ductility waterproof anti-crack composite mortar comprises the following steps:
the method comprises the following steps: pouring cement, mineral powder, silica fume and quartz sand in parts by weight into a stirrer, setting the stirring speed at 200r/min, and performing dry stirring for 3min to obtain uniformly mixed dry powder;
step two: adding water in parts by weight into fibers and magnesium phosphate whiskers in parts by weight, stirring, uniformly dispersing, adding a carbon quantum dot solution in parts by weight, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent and a water repellent in parts by weight, and stirring at 200r/min for 20min to obtain a mixed solution;
step three: and (3) adding the mixed solution obtained in the step (II) into the dry powder obtained in the step (I), stirring and adding at 200r/min, after the addition is finished, wet stirring for 5min, and uniformly mixing to obtain the high-ductility waterproof anti-cracking composite mortar.
Example 2
The high-ductility waterproof anti-cracking composite mortar comprises the following raw materials in parts by mass: 42 parts of cement, 30 parts of mineral powder, 35 parts of silica fume, 60 parts of quartz sand, 20 parts of fiber, 15 parts of magnesium phosphate whisker, 16 parts of carbon quantum dot solution, 1.2 parts of ethylene-vinyl acetate copolymer emulsion, 0.9 part of water reducing agent, 0.7 part of water repellent and 40 parts of water;
the preparation method of the high-ductility waterproof anti-crack composite mortar comprises the following steps:
the method comprises the following steps: pouring cement, mineral powder, silica fume and quartz sand in parts by weight into a stirrer, setting the stirring speed to be 300r/min, and performing dry stirring for 5min to obtain uniformly mixed dry powder;
step two: taking fiber and magnesium phosphate whisker in parts by weight, adding water in parts by weight, stirring, uniformly dispersing, then adding carbon quantum dot solution in parts by weight, ethylene-vinyl acetate copolymer emulsion, water reducing agent and water repellent, and stirring for 30min at 300r/min to obtain a mixed solution;
step three: and (3) adding the mixed solution obtained in the step (II) into the dry powder obtained in the step (I), stirring and adding at 300r/min, after the adding is finished, wet stirring for 10min, and uniformly mixing to obtain the high-ductility waterproof anti-cracking composite mortar.
Example 3
The high-ductility waterproof anti-crack composite mortar comprises the following raw materials in parts by mass: 35 parts of cement, 25 parts of mineral powder, 30 parts of silica fume, 50 parts of quartz sand, 15 parts of fiber, 12 parts of magnesium phosphate whisker, 12 parts of carbon quantum dot solution, 1.0 part of ethylene-vinyl acetate copolymer emulsion, 0.7 part of water reducing agent, 0.5 part of water repellent and 35 parts of water;
the preparation method of the high-ductility waterproof anti-crack composite mortar comprises the following steps:
the method comprises the following steps: pouring cement, mineral powder, silica fume and quartz sand in parts by weight into a stirrer, setting the stirring speed to be 250r/min, and performing dry stirring for 4min to obtain uniformly mixed dry powder;
step two: adding water in parts by weight into fibers and magnesium phosphate whiskers in parts by weight, stirring, uniformly dispersing, adding a carbon quantum dot solution in parts by weight, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent and a water repellent in parts by weight, and stirring at the speed of 250r/min for 25min to obtain a mixed solution;
step three: and (3) adding the mixed solution obtained in the step two into the dry powder obtained in the step one, stirring and adding at 250r/min, after the addition is finished, wet stirring for 7min, and uniformly mixing to obtain the high-ductility waterproof anti-cracking composite mortar.
And (3) testing:
pouring the high-ductility waterproof anti-cracking composite mortar prepared in the embodiment into a rectangular mold, wherein the length is 1000mm, the width is 50mm, and the thickness is 10mm, and performing tensile detection according to the standard JC/T2461-2018 mechanical property test method for the high-ductility fiber reinforced cement-based composite material;
normal temperature crack resistance: according to JC/T951 2005 'test method for crack resistance of cement mortar', the standard requires that the cracking index is within 180-320 mm;
waterproof performance: according to the detection of JC/T984-2011 polymer cement waterproof mortar, the standard requirement is that the seepage pressure (MPa) resistance is more than or equal to 1.5 MPa;
the results obtained are shown in the table:
| example 1 | Example 2 | Example 3 | |
| Peak tensile stress (MPa) | 8.45 | 9.86 | 9.37 |
| Ultimate tensile strain (%) | 5.87 | 6.94 | 6.51 |
| Cracking index (mm) | 181.7 | 180.6 | 181.1 |
| Anti-seepage pressure (MPa) | 1.7 | 1.9 | 1.8 |
As shown in the table, the high-ductility waterproof anti-crack composite mortar prepared by the method has a large ultimate tensile strain value after being prepared into a mold, which shows that the ductility is high, the cracking index is low, the high-ductility waterproof anti-crack composite mortar has good anti-cracking performance, the anti-permeation pressure value is high, and the waterproof performance is good.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The high-ductility waterproof anti-crack composite mortar is characterized by comprising the following raw materials in parts by mass: 28-42 parts of cement, 20-30 parts of mineral powder, 20-35 parts of silica fume, 40-60 parts of quartz sand, 10-20 parts of fiber, 8-15 parts of magnesium phosphate whisker, 8-16 parts of carbon quantum dot solution, 0.8-1.2 parts of ethylene-vinyl acetate copolymer emulsion, 0.5-0.9 part of water reducing agent, 0.4-0.7 part of water repellent and 30-40 parts of water;
the preparation method of the high-ductility waterproof anti-crack composite mortar comprises the following steps:
the method comprises the following steps: pouring cement, mineral powder, silica fume and quartz sand in parts by weight into a stirrer, setting the stirring speed to be 200-300 r/min, and performing dry stirring for 3-5 min to obtain uniformly mixed dry powder;
step two: adding water in parts by weight into fibers and magnesium phosphate whiskers in parts by weight, stirring, uniformly dispersing, adding a carbon quantum dot solution in parts by weight, an ethylene-vinyl acetate copolymer emulsion, a water reducing agent and a water repellent in parts by weight, and stirring at 200-300 r/min for 20-30 min to obtain a mixed solution;
step three: and (3) adding the mixed solution obtained in the step (II) into the dry powder obtained in the step (I), stirring and adding at 200-300 r/min, after the adding is finished, wet-stirring for 5-10 min, and uniformly mixing to obtain the high-ductility waterproof anti-cracking composite mortar.
2. The high-ductility waterproof anti-crack composite mortar according to claim 1, wherein the cement is Portland cement with a designation of 42.5 or more; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 18-24%.
3. The high-ductility waterproof anti-crack composite mortar according to claim 1, wherein the mineral powder is granulated blast furnace slag powder of manganese ore and iron ore, and the mass ratio of the granulated blast furnace slag powder of manganese ore to iron ore is 1: 1, grade of ore fines is S105.
4. The high-ductility waterproof anti-cracking composite mortar according to claim 1, wherein the fineness of the quartz sand is 80 meshes and 200 meshes, and the mass ratio of the 80-mesh quartz sand to the 200-mesh quartz sand is 1: 2 to 3.
5. The high-ductility waterproof anti-crack composite mortar according to claim 1, wherein the fiber has a fiber length shorter than 3mm and a diameter smaller than 2mm, and is a mixture of modified polypropylene fibers and modified PE fibers, and the mass ratio of the modified polypropylene fibers to the modified PE fibers is as follows: the modified PE fiber = 1-2: 1.
6. the high-ductility waterproof anti-crack composite mortar according to claim 5, wherein: the modified polypropylene fiber is prepared by putting polypropylene fiber into a container, adding absolute ethyl alcohol with the same mass, completely soaking the polypropylene fiber with the absolute ethyl alcohol for 10-12 hours, transferring the container into a 50 ℃ oven to dry to constant weight, weighing gamma-aminopropyltriethoxysilane with the mass of 0.1-0.5 time of that of the polypropylene fiber, adding deionized water with the same mass as that of the gamma-aminopropyltriethoxysilane, absolute ethyl alcohol with the mass of 6-9 times of that of the gamma-aminopropyltriethoxysilane, 400W power, performing ultrasonic dispersion for 20-30 min in a 60 ℃ water bath, standing for 2-3 hours, filtering, washing with deionized water for 2-3 times, transferring the container into a 60 ℃ oven to dry to constant weight, and obtaining the modified polypropylene fiber;
the preparation method of the modified PE fiber is the same as that of the modified polypropylene fiber.
7. The high-ductility waterproof anti-crack composite mortar according to claim 1, wherein: the carbon quantum dot solution is an aqueous solution of carbon quantum dots, a certain amount of carbon quantum dots are taken, ultrapure water with the mass being 20-25 times that of the carbon quantum dots is added, and the mixture is subjected to 400W power ultrasonic treatment for 3-5 min to obtain a uniform mixed solution, namely the carbon quantum dot solution.
8. The high-ductility waterproof anti-crack composite mortar according to claim 1, wherein: the ethylene-vinyl acetate copolymer emulsion is prepared by taking 5 parts by mass of nano SiO 2 Adding 95 parts by mass of absolute ethyl alcohol, and ultrasonically dispersing for 1 hour to ensure that the nano SiO 2 Uniformly dispersing, adjusting the pH to 4-5 by using formic acid, adding 5 parts by weight of gamma-methacryloxypropyltrimethoxysilane, reacting in a water bath at the temperature of 80-90 ℃ for 10-12 h, stirring at the speed of 60-80 r/min in the reaction process, adjusting the pH to be neutral by using disodium hydrogen carbonate after the reaction, and quickly filtering to obtain the gamma-methacryloxypropyltrimethoxysilane-methacryloxypropyltrimethoxysilane modified nano SiO 2 Adding 30 parts by mass of absolute ethyl alcohol, uniformly dispersing by ultrasonic, adding the mixture into an ethylene-vinyl acetate copolymer, and modifying the gamma-methacryloxypropyltrimethoxysilane by using the nano SiO 2 The mass ratio of the absolute ethyl alcohol mixed solution to the ethylene-vinyl acetate copolymer is 2-3: 50, stirring for 12 hours at the speed of 80-100 r/min to obtain the nano SiO 2 Modified ethylene-vinyl acetate copolymer emulsion.
9. The high-ductility waterproof anti-cracking composite mortar according to claim 1, characterized in that: the water repellent is prepared from isooctyltriethoxysilane, graphene oxide and tetraethyl orthosilicate in a mass ratio of 3-5: 2-3: 1 are mixed.
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