CN114434595A - Low-shrinkage high-strength concrete and preparation method thereof - Google Patents
Low-shrinkage high-strength concrete and preparation method thereof Download PDFInfo
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000011812 mixed powder Substances 0.000 claims abstract description 65
- 238000003756 stirring Methods 0.000 claims abstract description 58
- 238000005121 nitriding Methods 0.000 claims abstract description 52
- 230000004048 modification Effects 0.000 claims abstract description 41
- 238000012986 modification Methods 0.000 claims abstract description 41
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 20
- 239000003607 modifier Substances 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 21
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 20
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 20
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 18
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 11
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 11
- 229920002873 Polyethylenimine Polymers 0.000 claims description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 11
- 239000010881 fly ash Substances 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 11
- 229920001285 xanthan gum Polymers 0.000 claims description 11
- 239000000230 xanthan gum Substances 0.000 claims description 11
- 229940082509 xanthan gum Drugs 0.000 claims description 11
- 235000010493 xanthan gum Nutrition 0.000 claims description 11
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 10
- 239000006004 Quartz sand Substances 0.000 claims description 10
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- 229910021536 Zeolite Inorganic materials 0.000 claims description 10
- 239000010432 diamond Substances 0.000 claims description 10
- 229910003460 diamond Inorganic materials 0.000 claims description 10
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 235000019359 magnesium stearate Nutrition 0.000 claims description 10
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- 239000004408 titanium dioxide Substances 0.000 claims description 10
- 239000010457 zeolite Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- OMNKZBIFPJNNIO-UHFFFAOYSA-N n-(2-methyl-4-oxopentan-2-yl)prop-2-enamide Chemical compound CC(=O)CC(C)(C)NC(=O)C=C OMNKZBIFPJNNIO-UHFFFAOYSA-N 0.000 claims description 5
- 229940047670 sodium acrylate Drugs 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 239000004567 concrete Substances 0.000 abstract description 26
- 238000003763 carbonization Methods 0.000 abstract description 11
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- 239000004005 microsphere Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000011405 expansive cement Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011325 microbead Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2111/00008—Obtaining or using nanotechnology related 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
- C04B2111/346—Materials exhibiting reduced plastic shrinkage cracking
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of low-shrinkage high-strength concrete, belonging to the technical field of building materials, and the preparation method comprises primary mixing, nitriding treatment, polymer surface modification, vacuum cold treatment and post treatment; the nitriding treatment is to place the primary mixed powder in a vacuum nitriding furnace for vacuum nitriding; performing surface modification on the polymer, namely putting the primary mixed powder subjected to nitriding treatment and a surface modifier into a stirrer for stirring, and performing microwave radiation modification after stirring; the preparation method can improve the compressive strength, the breaking strength, the tensile strength, the ductility and the volume stability of the concrete, reduce the dead weight, and simultaneously improve the elastic modulus, the carbonization resistance, the erosion resistance, the durability, the fluidity and the workability.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to low-shrinkage high-strength concrete and a preparation method thereof.
Background
The concrete is a general term of engineering composite materials formed by cementing aggregate into a whole by cementing materials, has the characteristics of rich raw materials, low price and simple production process, so that the dosage of the concrete is increased, and meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and is widely applied to various civil engineering, shipbuilding industry, mechanical industry, ocean development, geothermal engineering and the like.
As a civil engineering material with the largest using amount, the concrete also has the advantages of strong plasticity, good bond strength, good economy, high safety, good fire resistance, wide application range, good durability and relatively low energy consumption, but the existing concrete has the defects of low tensile strength, poor ductility, great weight and poor volume stability, and limits the further popularization and use of the concrete.
The method for improving the volume stability of concrete mainly comprises the steps of adopting common lightweight aggregate, adopting expansive cement, reducing the water cement ratio and adopting steam curing or high-pressure steam curing, but the adoption of the common lightweight aggregate can reduce the elastic modulus and has influence on the strength; the adoption of the expansive cement can reduce the carbonization resistance, the erosion resistance and the durability; reducing the water cement ratio reduces the fluidity and workability of the concrete; the later strength and durability of the concrete can be influenced by adopting steam curing or high-pressure steam curing, and at present, no method capable of improving the compressive strength, the breaking strength, the tensile strength, the ductility and the volume stability of the concrete, reducing the dead weight and simultaneously improving the elastic modulus, the carbonization resistance, the erosion resistance, the durability, the flowability and the workability exists.
Chinese patent CN104844099B discloses a low-shrinkage low-viscosity ultrahigh-strength concrete, which comprises the following components in percentage by weight according to a single formula: cement of 250-300kg, micro-beads of 120-180kg, mineral powder of 90-120kg and machine-made sand of 820-860 kg; 950 kg of broken stone and 1000kg of water reducing agent, and 7-11kg of water reducing agent; stirring with 115 kg of water and 125kg of water for 1.5-2min to obtain low-shrinkage low-viscosity ultrahigh-strength concrete; the low-shrinkage low-viscosity ultrahigh-strength concrete has low total shrinkage, the emptying time of an inverted slump cone is 5-10s, the 28d compressive strength is 110-135 MPa, and the 56d compressive strength is 120-135MPa, and the defects of the patent are as follows: the prepared low-shrinkage low-viscosity ultrahigh-strength concrete has poor carbonization resistance, erosion resistance and durability.
Chinese patent CN110563409B discloses a steam-curing-free, light and ultra-high-strength concrete and a preparation method thereof, wherein the concrete consists of a cementing material, interface modified high-strength porous microspheres, natural sand, a high-water-absorption slow-release type internal curing material, an ultra-dispersion shrinkage-reduction type additive and water, and the composition of cementing material particles is designed and optimized by adopting silica fume, fly ash microbeads and ultrafine limestone powder; firing high-strength porous microspheres, and treating the surfaces of the porous microspheres to obtain interface modified high-strength porous microspheres so as to optimize a concrete interface transition region; can show the early self-constriction that reduces the concrete, the concrete of preparation has intensity height, and the quality is light, and the shrinkage is reduced characteristics such as little, can obviously reduce the structure dead weight, the not enough of this patent: the prepared concrete has small elastic modulus and poor fluidity and workability.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides low-shrinkage high-strength concrete and a preparation method thereof, which can improve the compressive strength, the breaking strength, the tensile strength, the ductility and the volume stability of the concrete, reduce the self weight, and simultaneously improve the elastic modulus, the carbonization resistance, the erosion resistance, the durability, the fluidity and the workability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a process for preparing the low-shrinkage high-strength concrete includes primary mixing, nitridizing, high-molecular surface modification, vacuum cooling and post-treating.
And the primary mixing step comprises the steps of mixing cement, fly ash, quartz sand, nano boron nitride powder, desulfurized gypsum powder, diamond titanium dioxide powder, zeolite powder, sodium metasilicate, magnesium stearate and light magnesium oxide, stirring, and stirring to obtain primary mixed powder.
The stirring speed in the primary mixing step is 400-600rpm, and the stirring time is 1-1.5 h.
The cement is ordinary portland cement PO 42.5.
The particle size of the nanometer boron nitride powder is 60-90 nm.
The primary mixed powder comprises, by weight, 400-420 parts of cement, 30-40 parts of fly ash, 500-530 parts of quartz sand, 20-30 parts of nano boron nitride powder, 30-40 parts of desulfurized gypsum powder, 15-20 parts of diamond titanium dioxide, 25-30 parts of zeolite powder, 12-15 parts of sodium metasilicate, 10-15 parts of magnesium stearate and 35-40 parts of light magnesium oxide.
The nitriding treatment is to carry out vacuum nitriding on the primary mixed powder, wherein the vacuum degree during the vacuum nitriding is controlled to be 70-90Pa, and the flow rate of ammonia gas is 2-3m3The temperature is 300-.
And (3) performing high-molecular surface modification, namely mixing the primary mixed powder subjected to nitriding treatment with a surface modifier, stirring, performing microwave radiation modification after stirring is finished, and obtaining the primary mixed powder subjected to surface modification after the microwave radiation modification is finished.
The stirring speed in the polymer surface modification step is 300-400rpm, and the stirring time is 50-55 min.
The frequency of microwave radiation modification in the polymer surface modification step is 2-3GHz, the power of microwave is 500-600W, and the time of microwave radiation modification is 20-25 min.
Wherein the mass ratio of the primary mixed powder after the nitriding treatment to the surface modifier is 30: 1-1.2.
The surface modifier comprises the following components in parts by weight: 12-15 parts of maleic anhydride, 7-8 parts of sodium acrylate, 0.5-1 part of diacetone acrylamide and 0.1-0.2 part of azobisisobutyronitrile.
And (3) performing vacuum cooling treatment after uniformly mixing the surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum, controlling the vacuum degree in the vacuum cooling treatment to be 50-60Pa, the temperature to be-10-5 ℃, the time of the vacuum cooling treatment to be 40-50min, and finishing the vacuum cooling treatment to obtain the mixed powder.
Wherein the mass ratio of the surface-modified primary mixed powder, the polycarboxylic acid water reducing agent, the magnesium oxide expanding agent, the polyvinyl alcohol fiber and the xanthan gum is 1000-1100: 4-6: 5-7: 8-10: 10-12.
And the post-treatment comprises the steps of mixing water, mixed powder, polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate, stirring, injecting the mixture into a mold for molding after stirring is finished, then standing the mold, removing the mold, and maintaining to obtain the low-shrinkage high-strength concrete.
The stirring speed in the post-treatment step is 500-600rpm, and the stirring time is 1-1.5 h.
In the post-treatment step, the temperature of the die during standing treatment is 30-40 ℃, the humidity is 60-80%, and the standing treatment time is 20-22 h.
The temperature in the post-treatment step is 15-25 ℃, the humidity is 95-98%, and the curing time is 5-7 d.
The content of the dimethyl diallyl ammonium chloride in the dimethyl diallyl ammonium chloride aqueous solution is 63-67%.
Wherein the mass ratio of the water, the mixed powder, the polyethyleneimine, the dimethyl diallyl ammonium chloride aqueous solution and the hydroxyethyl methacrylate is 120-150: 800-820: 5-8: 10-12: 3-6.
Compared with the prior art, the invention has the beneficial effects that:
(1) the preparation method of the low-shrinkage high-strength concrete can improve the compressive strength, the breaking strength and the splitting tensile strength of the concrete, simultaneously reduce the apparent density and improve the elastic modulus, wherein the compressive strength of the prepared low-shrinkage high-strength concrete is 63.2-64.5MPa, the breaking strength is 9.6-9.9MPa, the splitting tensile strength is 4.41-4.56MPa, and the apparent density is 1920-1940kg/m3The elastic modulus is 45.6-46.1 GPa;
(2) the preparation method of the low-shrinkage high-strength concrete can reduce the self-shrinkage capacity of the concrete, and the 14d self-shrinkage capacity of the prepared low-shrinkage high-strength concrete is 3.7-4.0 ppm;
(3) the preparation method of the low-shrinkage high-strength concrete can improve the carbonization resistance, the erosion resistance and the durability of the concrete, the 14d self-shrinkage of the prepared low-shrinkage high-strength concrete is 3.7-4.0ppm, the carbonization depth at 3d is 0.52-0.56mm, the carbonization depth at 7d is 0.85-0.87mm, the carbonization depth at 14d is 1.10-1.13mm, the carbonization depth at 28d is 1.49-1.53mm, the compressive strength and corrosion resistance coefficient after 90 times of dry and wet cycles is 95.8-96.7%, and the electric flux at 56d is 187-194C;
(4) the inventionThe preparation method of the low-shrinkage high-strength concrete can improve the fluidity and the workability of the concrete, the slump expansion degree of the prepared low-shrinkage high-strength concrete is 749-757mm, and the expansion time T is500Is 3.8-4.1 s;
(5) the preparation method of the low-shrinkage high-strength concrete can reduce the curing time of the concrete to 5-7 days.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
A preparation method of low-shrinkage high-strength concrete comprises the following steps:
1. primary mixing: putting cement, fly ash, quartz sand, nano boron nitride powder, desulfurized gypsum powder, diamond titanium dioxide powder, zeolite powder, sodium metasilicate, magnesium stearate and light magnesium oxide into a stirrer for stirring, controlling the stirring speed to be 400rpm and the stirring time to be 1h, and obtaining primary mixed powder after the stirring is finished.
The cement is ordinary portland cement PO 42.5.
The particle size of the nanometer boron nitride powder is 60 nm.
The primary mixed powder comprises, by weight, 400 parts of cement, 30 parts of fly ash, 500 parts of quartz sand, 20 parts of nano boron nitride powder, 30 parts of desulfurized gypsum powder, 15 parts of diamond titanium dioxide, 25 parts of zeolite powder, 12 parts of sodium metasilicate, 10 parts of magnesium stearate and 35 parts of light magnesium oxide.
2. Nitriding treatment: placing the primary mixed powder in a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to 70Pa, and introducing the powder into the vacuum nitriding furnace at a flow rate of 2m3H, ammonia gas, heating the vacuum nitriding furnace to 300 ℃, opening an exhaust valve of the vacuum nitriding furnace when the pressure in the vacuum nitriding furnace reaches 0.03MPa, maintaining the pressure in the vacuum nitriding furnace at 0.03MPa by controlling the opening of the exhaust valve, and treating for 2.5 hours in the vacuum nitriding furnace to obtain the nitrided primary mixed powder.
3. Polymer surface modification: and (2) putting the primary mixed powder subjected to nitriding treatment and a surface modifier into a stirrer for stirring, controlling the stirring speed to be 300rpm, stirring for 50min, performing microwave radiation modification after stirring is finished, controlling the frequency of the microwave radiation modification to be 2GHz, controlling the microwave power to be 500W, and controlling the microwave radiation modification time to be 20min, thus obtaining the primary mixed powder subjected to surface modification after the microwave radiation modification is finished.
Wherein the mass ratio of the primary mixed powder after the nitriding treatment to the surface modifier is 30:1.
The surface modifier comprises the following components in parts by weight: 12 parts of maleic anhydride, 7 parts of sodium acrylate, 0.5 part of diacetone acrylamide and 0.1 part of azobisisobutyronitrile.
4. Vacuum cooling treatment: uniformly mixing the surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum, then placing the mixture into vacuum refrigeration equipment for vacuum cold treatment, controlling the vacuum degree in the vacuum cold treatment to be 50Pa, controlling the temperature to be-10 ℃, controlling the time of the vacuum cold treatment to be 40min, and obtaining the mixed powder after the vacuum cold treatment.
The surface-modified primary mixed powder, the polycarboxylic acid water reducing agent, the magnesium oxide expanding agent, the polyvinyl alcohol fiber and the xanthan gum are in a mass ratio of 1000: 4: 5: 8: 10.
5. and (3) post-treatment: and (2) putting water, mixed powder, polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate into a stirrer, stirring at the stirring speed of 500rpm for 1h, injecting the mixture into a mold for molding after stirring, then placing the mold at the temperature of 30 ℃ and the humidity of 60%, standing the mold for 20h, removing the mold, and curing the mold for 5d at the temperature of 15 ℃ and the humidity of 95% to obtain the low-shrinkage high-strength concrete.
The content of the dimethyl diallyl ammonium chloride in the dimethyl diallyl ammonium chloride aqueous solution is 63%.
Wherein the mass ratio of water, mixed powder, polyethyleneimine, dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate is 120: 800: 5: 10: 3.
example 2
A preparation method of low-shrinkage high-strength concrete comprises the following steps:
1. primary mixing: putting cement, fly ash, quartz sand, nano boron nitride powder, desulfurized gypsum powder, diamond titanium dioxide powder, zeolite powder, sodium metasilicate, magnesium stearate and light magnesium oxide into a mixer for stirring, controlling the stirring speed to be 500rpm and the stirring time to be 1.2h, and obtaining primary mixed powder after the stirring is finished.
The cement is ordinary portland cement PO 42.5.
The particle size of the nanometer boron nitride powder is 80 nm.
The primary mixed powder comprises, by weight, 410 parts of cement, 35 parts of fly ash, 520 parts of quartz sand, 25 parts of nano boron nitride powder, 35 parts of desulfurized gypsum powder, 17 parts of diamond titanium dioxide, 27 parts of zeolite powder, 13 parts of sodium metasilicate, 12 parts of magnesium stearate and 37 parts of light magnesium oxide.
2. Nitriding treatment: placing the primary mixed powder in a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to 80Pa, and introducing the powder into the vacuum nitriding furnace at a flow rate of 2.5m3H, ammonia gas, heating the temperature of the vacuum nitriding furnace to 320 ℃, opening an exhaust valve of the vacuum nitriding furnace when the pressure in the vacuum nitriding furnace reaches 0.04MPa, maintaining the pressure in the vacuum nitriding furnace at 0.04MPa by controlling the opening of the exhaust valve, and treating in the vacuum nitriding furnace for 2.7 hours to obtain the primary mixed powder after nitriding treatment.
3. Polymer surface modification: and (3) putting the primary mixed powder subjected to nitriding treatment and a surface modifier into a stirrer for stirring, controlling the stirring speed to be 350rpm, stirring for 52min, performing microwave radiation modification after stirring is finished, controlling the frequency of the microwave radiation modification to be 2.5GHz, controlling the microwave power to be 550W, and controlling the time of the microwave radiation modification to be 22min, thus obtaining the primary mixed powder subjected to surface modification after the microwave radiation modification is finished.
Wherein the mass ratio of the primary mixed powder after the nitriding treatment to the surface modifier is 30: 1.1.
The surface modifier comprises the following components in parts by weight: 13 parts of maleic anhydride, 7.5 parts of sodium acrylate, 0.7 part of diacetone acrylamide and 0.1 part of azobisisobutyronitrile.
4. Vacuum cooling treatment: uniformly mixing the surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum, then placing the mixture into vacuum refrigeration equipment for vacuum cold treatment, controlling the vacuum degree in the vacuum cold treatment to be 55Pa, controlling the temperature to be-7 ℃, controlling the time of the vacuum cold treatment to be 45min, and obtaining the mixed powder after the vacuum cold treatment.
The surface-modified primary mixed powder, the polycarboxylic acid water reducing agent, the magnesium oxide expanding agent, the polyvinyl alcohol fiber and the xanthan gum are in a mass ratio of 1050: 5: 6: 9: 11.
5. and (3) post-treatment: and (2) putting water, mixed powder, polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate into a stirrer, stirring at the stirring speed of 550rpm for 1.2h, injecting the mixture into a mold after stirring is finished, standing the mold at the temperature of 35 ℃ and the humidity of 70% for 21h, removing the mold, and curing at the temperature of 20 ℃ and the humidity of 97% for 6d to obtain the low-shrinkage high-strength concrete.
The content of the dimethyl diallyl ammonium chloride in the dimethyl diallyl ammonium chloride aqueous solution is 65%.
Wherein the mass ratio of water, mixed powder, polyethyleneimine, dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate is 130: 810: 7: 11: 5.
example 3
A preparation method of low-shrinkage high-strength concrete comprises the following steps:
1. primary mixing: putting cement, fly ash, quartz sand, nano boron nitride powder, desulfurized gypsum powder, diamond titanium dioxide powder, zeolite powder, sodium metasilicate, magnesium stearate and light magnesium oxide into a mixer for stirring, controlling the stirring speed to be 600rpm, and the stirring time to be 1.5h, and obtaining primary mixed powder after the stirring is finished.
The cement is ordinary portland cement PO 42.5.
The particle size of the nanometer boron nitride powder is 90 nm.
The primary mixed powder comprises, by weight, 420 parts of cement, 40 parts of fly ash, 530 parts of quartz sand, 30 parts of nano boron nitride powder, 40 parts of desulfurized gypsum powder, 20 parts of diamond titanium dioxide, 30 parts of zeolite powder, 15 parts of sodium metasilicate, 15 parts of magnesium stearate and 30 parts of light magnesium oxide.
2. Nitriding treatment: placing the primary mixed powder in a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to 90Pa, and introducing 3m of flow into the vacuum nitriding furnace3H, ammonia gas, heating the temperature of the vacuum nitriding furnace to 350 ℃, opening an exhaust valve of the vacuum nitriding furnace when the pressure in the vacuum nitriding furnace reaches 0.05MPa, maintaining the pressure in the vacuum nitriding furnace at 0.05MPa by controlling the opening of the exhaust valve, and treating for 3 hours in the vacuum nitriding furnace to obtain the primary mixed powder after nitriding treatment.
3. Polymer surface modification: and (3) putting the primary mixed powder subjected to nitriding treatment and a surface modifier into a stirrer for stirring, controlling the stirring speed to be 400rpm and the stirring time to be 55min, performing microwave radiation modification after the stirring is finished, controlling the frequency of the microwave radiation modification to be 3GHz, controlling the microwave power to be 600W, and controlling the microwave radiation modification time to be 25min, thus obtaining the primary mixed powder subjected to surface modification after the microwave radiation modification is finished.
Wherein the mass ratio of the primary mixed powder after the nitriding treatment to the surface modifier is 30: 1.2.
The surface modifier comprises the following components in parts by weight: 15 parts of maleic anhydride, 8 parts of sodium acrylate, 1 part of diacetone acrylamide and 0.2 part of azobisisobutyronitrile.
4. Vacuum cooling treatment: uniformly mixing the surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum, then placing the mixture into vacuum refrigeration equipment for vacuum cold treatment, controlling the vacuum degree in the vacuum cold treatment to be 60Pa, controlling the temperature to be-5 ℃, controlling the time of the vacuum cold treatment to be 50min, and obtaining the mixed powder after the vacuum cold treatment.
The surface-modified primary mixed powder, the polycarboxylic acid water reducing agent, the magnesium oxide expanding agent, the polyvinyl alcohol fiber and the xanthan gum are mixed according to the mass ratio of 1100: 6: 7: 10: 12.
5. and (3) post-treatment: and (2) putting water, mixed powder, polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate into a stirrer, stirring at the stirring speed of 600rpm for 1.5h, injecting the mixture into a mold for molding after stirring, standing the mold at the temperature of 40 ℃ and the humidity of 80% for 22h, removing the mold, and curing at the temperature of 25 ℃ and the humidity of 98% for 7d to obtain the low-shrinkage high-strength concrete.
The content of the dimethyl diallyl ammonium chloride in the dimethyl diallyl ammonium chloride aqueous solution is 67%.
Wherein the mass ratio of water, mixed powder, polyethyleneimine, dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate is 150: 820: 8: 12: 6.
comparative example 1
The preparation method of the low-shrinkage high-strength concrete in the embodiment 1 is adopted, and the difference is that: omitting the 2 nd step of nitriding treatment, namely directly using the primary mixed powder prepared in the 1 st step for 3 rd step of macromolecular surface modification.
Comparative example 2
The preparation method of the low-shrinkage high-strength concrete in the embodiment 1 is adopted, and the difference is that: omitting the step 3 of high molecular surface modification, namely directly using the primary mixed powder after the nitriding treatment prepared in the step 2 for the step 4 of vacuum cold treatment.
Comparative example 3
The preparation method of the low-shrinkage high-strength concrete in the embodiment 1 is adopted, and the difference is that: omitting the vacuum cold treatment in the 4 th step of vacuum cold treatment, namely modifying the 4 th step of vacuum cold treatment into surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum according to the mass ratio of 1000: 4: 5: 8: 10 to obtain mixed powder after being uniformly mixed.
Comparative example 4
The preparation method of the low-shrinkage high-strength concrete in the embodiment 1 is adopted, and the difference is that: in the 5 th post-treatment step, the addition of polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate is omitted.
The low-shrinkage high-strength concrete prepared in examples 1 to 3 and comparative examples 1 to 4 were tested for compressive strength, flexural strength, tensile strength, self-weight, and modulus of elasticity, and the test results were as follows:
the self-shrinkage, carbonization depth, compression strength and corrosion resistance coefficient after 90 times of dry and wet cycles and electric flux of the low-shrinkage high-strength concrete prepared in the examples 1 to 3 and the comparative examples 1 to 4 are tested, and the test results are as follows:
slump-spread and spread time of the low-shrinkage high-strength concrete prepared in examples 1 to 3 and comparative examples 1 to 4 were measured, and the results were as follows:
all percentages used in the present invention are mass percentages unless otherwise indicated.
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 changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 preparation method of low-shrinkage high-strength concrete is characterized by comprising the steps of primary mixing, nitriding treatment, high polymer surface modification, vacuum cooling treatment and post-treatment;
the primary mixing step comprises the steps of mixing cement, fly ash, quartz sand, nano boron nitride powder, desulfurized gypsum powder, diamond titanium dioxide powder, zeolite powder, sodium metasilicate, magnesium stearate and light magnesium oxide, stirring, and obtaining primary mixed powder after stirring;
the composition of the primary mixed powder in the primary mixing step comprises, by weight, 400-420 parts of cement, 30-40 parts of fly ash, 500-530 parts of quartz sand, 20-30 parts of nano boron nitride powder, 30-40 parts of desulfurized gypsum powder, 15-20 parts of diamond titanium dioxide, 25-30 parts of zeolite powder, 12-15 parts of sodium metasilicate, 10-15 parts of magnesium stearate and 35-40 parts of light magnesium oxide;
the nitriding treatment is to carry out vacuum nitriding on the primary mixed powder, wherein the vacuum degree during the vacuum nitriding is controlled to be 70-90Pa, and the flow rate of ammonia gas is 2-3m3The temperature is 300-350 ℃, the pressure of vacuum nitridation is 0.03-0.05MPa, and the time of vacuum nitridation is 2.5-3h, so as to obtain primary mixed powder after nitridation treatment;
the polymer surface modification is to mix the primary mixed powder after the nitridation treatment with a surface modifier and then stir the mixture, and then carry out microwave radiation modification after the stirring is finished, so as to obtain the primary mixed powder after the surface modification is finished;
the mass ratio of the primary mixed powder subjected to nitriding treatment to the surface modifier in the polymer surface modification step is 30: 1-1.2;
the surface modifier comprises the following components in parts by weight: 12-15 parts of maleic anhydride, 7-8 parts of sodium acrylate, 0.5-1 part of diacetone acrylamide and 0.1-0.2 part of azobisisobutyronitrile;
the frequency of microwave radiation modification in the polymer surface modification step is 2-3GHz, the power of microwave is 500-600W, and the time of microwave radiation modification is 20-25 min;
performing vacuum cooling treatment, namely uniformly mixing the surface-modified primary mixed powder, a polycarboxylic acid water reducing agent, a magnesium oxide expanding agent, polyvinyl alcohol fibers and xanthan gum, performing vacuum cooling treatment, controlling the vacuum degree in the vacuum cooling treatment to be 50-60Pa, the temperature to be-10 ℃ to-5 ℃, the time of the vacuum cooling treatment to be 40-50min, and finishing the vacuum cooling treatment to obtain mixed powder;
the mass ratio of the surface-modified primary mixed powder, the polycarboxylic acid water reducing agent, the magnesium oxide expanding agent, the polyvinyl alcohol fiber and the xanthan gum in the vacuum cooling treatment step is 1000-1100: 4-6: 5-7: 8-10: 10-12;
the post-treatment comprises the steps of mixing water, mixed powder, polyethyleneimine, a dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate, stirring, injecting the mixture into a mold for molding after stirring is finished, then standing the mold, removing the mold, and maintaining to obtain the low-shrinkage high-strength concrete;
the mass ratio of water, mixed powder, polyethyleneimine, dimethyl diallyl ammonium chloride aqueous solution and hydroxyethyl methacrylate in the post-treatment step is 120-150: 800-820: 5-8: 10-12: 3-6.
2. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the stirring speed in the primary mixing step is 400-600rpm, and the stirring time is 1-1.5 h.
3. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the cement in the primary mixing step is Portland cement PO 42.5.
4. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the particle size of the nano boron nitride powder in the primary mixing step is 60-90 nm.
5. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the stirring speed in the step of modifying the polymer surface is 300-400rpm, and the stirring time is 50-55 min.
6. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the temperature of the standing treatment of the mold in the post-treatment step is 30-40 ℃, the humidity is 60-80%, and the standing treatment time is 20-22 h.
7. The method for preparing low-shrinkage high-strength concrete according to claim 1, wherein the temperature during curing in the post-treatment step is 15-25 ℃, the humidity is 95-98%, and the curing time is 5-7 d.
8. The low-shrinkage high-strength concrete prepared by the preparation method of claim 1, which is characterized in that the compressive strength is 63.2-64.5MPa, the breaking strength is 9.6-9.9MPa, the split tensile strength is 4.41-4.56MPa, and the apparent density is 1920-3The elastic modulus is 45.6-46.1 GPa.
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