CN115159929B - Preparation method of ultra-high performance concrete - Google Patents
Preparation method of ultra-high performance concrete Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 63
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 52
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000002086 nanomaterial Substances 0.000 claims abstract description 36
- 108010010803 Gelatin Proteins 0.000 claims abstract description 29
- 239000008273 gelatin Substances 0.000 claims abstract description 29
- 229920000159 gelatin Polymers 0.000 claims abstract description 29
- 235000019322 gelatine Nutrition 0.000 claims abstract description 29
- 235000011852 gelatine desserts Nutrition 0.000 claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000004048 modification Effects 0.000 claims abstract description 7
- 238000012986 modification Methods 0.000 claims abstract description 7
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- 239000000203 mixture Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 22
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000499 gel Substances 0.000 claims description 6
- 238000009832 plasma treatment Methods 0.000 claims description 6
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
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- 238000001035 drying Methods 0.000 claims description 4
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- 238000001132 ultrasonic dispersion Methods 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
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- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 238000006482 condensation reaction Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000004108 freeze drying Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 238000002715 modification method Methods 0.000 claims description 2
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 230000036571 hydration Effects 0.000 abstract description 7
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 2
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- 230000000694 effects Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 238000011049 filling Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
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- 230000006872 improvement Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical group [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 238000009777 vacuum freeze-drying Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- -1 and at present Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002925 chemical effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1048—Polysaccharides, e.g. cellulose, or derivatives thereof
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application belongs to the technical field of production and application of ultra-high performance concrete, and particularly relates to a preparation method of ultra-high performance concrete. The application provides a preparation method of ultra-high performance concrete, which comprises the steps of firstly carrying out surface modification on ultra-high molecular weight polyethylene fibers to improve the bonding capacity of the ultra-high molecular weight polyethylene fibers, then adsorbing nano materials on the surfaces of the fibers by using gelatin, uniformly distributing the nano materials in the ultra-high performance concrete by using the fibers, and then melting the gelatin by using hydration process of dry materials and hydration heat, so that the nano materials are separated from the fibers and filled into the concrete, thereby achieving the purpose of improving the dispersibility.
Description
Technical Field
The application belongs to the technical field of production and application of ultra-high performance concrete, and particularly relates to a preparation method of ultra-high performance concrete.
Background
The common concrete material has the characteristics of good compression resistance, impermeability, plasticity and durability, local material availability, simple process, low cost and the like, and is widely applied to the construction of infrastructures, such as houses, highways, bridges, hydraulic engineering and the like, after the middle of 20 th century. Up to now, concrete has become the most commonly used and most used building material in the world, and statistics data show that the yield of ready mixed concrete in China reaches 23.36 hundreds of millions of cubic meters in 2018 only.
However, the common concrete has the defects of low tensile strength, high brittleness, easy cracking, heavy self weight and the like, and meanwhile, the low-strength concrete needs to consume more natural resources, releases more waste gas and dust in the production process, causes environmental pollution and cannot meet the development of building structures in the directions of light weight, large span, durability, environmental protection and the like. Accordingly, there is a need to further study and develop high strength durable concrete materials to accommodate the needs of modern infrastructure construction.
To make up for the shortages of common concrete, ultra High Performance Concrete (UHPC) has been developed. Ultra-high performance concrete has been born and developed for over 40 years, and a great deal of research shows that: compared with common concrete, UHPC has the advantages of super strong mechanical property (compressive strength is more than 120MPa, flexural strength is more than 15 MPa), super high toughness, excellent durability, light weight, low post maintenance cost and the like. However, the UHPC is not substantially popularized and applied all the time due to the influence of the problems of immature technical research, complex construction process, high manufacturing cost, large cement consumption and the like.
In 2012, in the third UHPC international conference, the application status of the nano material in the ultra-high performance concrete material is listed in the important rules of the conference, the research progress in the field is described in detail, and the nano material has become an important interest in improving the performance of the UHPC. At present, the view that the nano material can effectively improve the mechanical property and durability of the ultra-high performance concrete is proved by a great deal of scientific researches. However, there is a significant problem in that the nanomaterial is poorly dispersed in concrete, thereby resulting in incomplete improvement of ultra-high performance concrete.
Disclosure of Invention
Aiming at the technical problem that the nano material has poor dispersibility in ultra-high performance concrete, the application provides the preparation method of the ultra-high performance concrete, which has reasonable design, simple method and operation and can effectively improve the dispersibility of the nano material.
In order to achieve the above purpose, the application adopts the following technical scheme: the application provides a preparation method of ultra-high performance concrete, which comprises the following steps:
a. firstly, weighing the required ultra-high molecular weight polyethylene fiber according to the corresponding proportion of the ultra-high performance concrete, carrying out surface modification, and improving the bonding capacity of the ultra-high molecular weight polyethylene fiber for later use;
b. then, weighing corresponding nano materials according to the corresponding proportion of the ultra-high performance concrete, and then, dissolving the nano materials in a gelatin solution for ultrasonic dispersion;
c. adding the ultra-high molecular weight polyethylene fiber prepared in the step a into gelatin solution, uniformly dispersing by ultrasonic, and freeze-drying to obtain the ultra-high molecular weight polyethylene fiber attached with gelatin for later use;
d. then, mixing dry materials required by the ultra-high performance concrete together and uniformly stirring;
e. then adding the high-performance water reducer dry powder into the uniformly mixed dry material, and stirring to fully and uniformly mix the dry material and the high-performance water reducer dry powder;
f. weighing the required water according to the proportion of the water to the gel ratio of 0.18;
g. then, weighing two thirds of the mixture of the dry material obtained in the step e and the high-performance water reducing agent dry powder, uniformly stirring the mixture with all the water obtained in the step f, adding the mixture into the step c to obtain the ultra-high molecular weight polyethylene fiber attached with gelatin, and uniformly stirring the ultra-high molecular weight polyethylene fiber attached with gelatin;
h. and after the stirring is finished, continuously adding the rest one third of the mixture of the dry material and the high-performance water reducing agent dry powder into the mixture, continuously stirring the mixture until the mixture is uniformly stirred, and stopping stirring the mixture after the concrete substrate reaches the ideal fluidity to obtain the ultra-high-performance concrete material.
Preferably, in the step a, the modification method of the ultra-high molecular weight polyethylene fiber comprises the following steps:
a1, soaking the ultra-high molecular weight polyethylene fibers in ethanol, performing ultrasonic cleaning and drying;
a2, carrying out plasma treatment on the cleaned and dried ultra-high molecular weight polyethylene fibers;
and a3, immersing the ultra-high molecular weight polyethylene fiber subjected to plasma treatment in an ethanol/water mixed solution containing a silane coupling agent, taking out after reacting for 1-5 hours, and carrying out dehydration condensation reaction at 90-130 ℃ for 0.5-3 hours to obtain the ultra-high molecular weight polyethylene fiber with improved binding capacity.
Preferably, in the step b, the nano material is nano CaCO 3 Nano SiO 2 Nano Al 2 O 3 Nano MgO, carbon nano tube and graphene oxide.
Preferably, in the step b, the solid content of the gelatin solution is sufficient to satisfy the adhesion of the nanomaterial.
Preferably, in the step d, the dry material is cement, silica fume, mineral powder, quartz powder and quartz sand.
Preferably, in the step e, the high-performance water reducing agent dry powder accounts for 2% of the mass of the dry material.
Compared with the prior art, the application has the advantages and positive effects that,
1. the application provides a preparation method of ultra-high performance concrete, which comprises the steps of firstly carrying out surface modification on ultra-high molecular weight polyethylene fibers to improve the bonding capacity of the ultra-high molecular weight polyethylene fibers, then adsorbing nano materials on the surfaces of the fibers by using gelatin, uniformly distributing the nano materials in the ultra-high performance concrete by using the fibers, and then melting the gelatin by using hydration process of dry materials and hydration heat, so that the nano materials are separated from the fibers and filled into the concrete, thereby achieving the purpose of improving the dispersibility.
Detailed Description
In order that the above objects, features and advantages of the application may be more clearly understood, a further description of the application will be provided with reference to the following examples. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and therefore the present application is not limited to the specific embodiments of the disclosure that follow.
Example 1, this example is directed to a method for preparing ultra-high performance concrete with good nanomaterial dispersibility
It should be noted that, the purpose of improvement in this embodiment is mainly aimed at dispersion of nano materials, and the raw materials selected for ultra-high performance concrete may or may not be identical to this embodiment. In the embodiment, the dry material adopts cement, silica fume, mineral powder, quartz powder and quartz sand, wherein the cement is 42.5-grade ordinary Portland cement.
The main component of the silica fume is silicon dioxide, also called micro silicon powder, which is a byproduct in smelting metal silicon and ferrosilicon. The effects of silica fume in concrete are mainly pozzolanic chemical effects and physical effects of micro aggregate filling. The silicon dioxide can react with calcium hydroxide after cement hydration, and the compound product is calcium silicate gel. Calcium hydroxide has a reducing effect on the strength of concrete, but calcium silicate gel can increase the strength of concrete, so that the addition of silica fume can improve the strength of concrete to a certain extent. After being added into UHPC, the UHPC compactness can be improved.
The fly ash is mainly waste fine ash collected from a chimney of a coal-fired power plant, can be recycled and used as an admixture in concrete, can play a role of filling effect and rolling ball effect in a UHPC matrix, and improves the fluidity of the UHPC matrix.
Mineral powder, also called granulated blast furnace slag powder, is one of the important materials for preparing high-performance concrete which are recognized in the world today. In the preparation of UHPC, during steam curing, the mineral powder can exert the volcanic ash activity, can effectively reduce the content of calcium hydroxide in the matrix, and is beneficial to the strength improvement of UHPC. In addition, the composite material can be used as micro aggregate in a matrix to improve the pore structure in the matrix, improve the density and play a role in filling.
Quartz sand is present as an aggregate in the preparation of UHPC.
The quartz powder mainly plays a role in filling UHPC, fills gaps among other particles with small particle size, and improves the bulk density of UHPC.
The high-performance water reducer dry powder is a polycarboxylic acid high-efficiency water reducer, which is a high-performance water reducer and is one of the indispensable raw materials for preparing UHPC. The UHPC is mixed with a small amount of high-efficiency water reducer, so that the UHPC still has good workability and mechanical property under the condition of extremely low water-gel ratio.
The fiber mainly plays a role in toughening in UHPC, and at present, steel fibers and ultra-high molecular weight polyethylene fibers are commonly used in the market, and in the embodiment, short fibers of the ultra-high molecular weight polyethylene fibers are selected, wherein the mixing amount of the short fibers is 2% of the total volume.
The nanometer material is nanometer CaCO 3 Nano SiO 2 Nano Al 2 O 3 Nano MgO, carbon nanotubes and graphene oxide, in this embodiment, graphene oxide is selected. The doping amount is 0.026% of the total weight.
The addition amount of the nano material can be seen from the addition amount of the nano material, the addition amount of the nano material is too small in the whole preparation of the ultra-high performance concrete, and the water-gel ratio of the ultra-high performance concrete is low, so that the nano material is difficult to disperse.
For this purpose, the purpose of nanomaterial dispersion is achieved. In this embodiment, the required ultra-high molecular weight polyethylene fiber is weighed according to the corresponding proportion of the ultra-high performance concrete to perform surface modification, so that the bonding capability of the ultra-high molecular weight polyethylene fiber is improved for standby, the bonding capability of the ultra-high molecular weight polyethylene fiber is improved mainly by considering that the doping amount of the ultra-high molecular weight polyethylene fiber is large, and the diameter of the ultra-high molecular weight polyethylene fiber is generally about 3mm, and the ultra-high molecular weight polyethylene fiber has a certain volume, so that the ultra-high molecular weight polyethylene fiber can be uniformly dispersed when being stirred by stirring equipment, and nano materials are adsorbed on the ultra-high molecular weight polyethylene fiber, so that the aim of improving the dispersibility can be achieved by using the ultra-high molecular weight polyethylene fiber.
There are many methods for modifying ultra-high molecular weight polyethylene fibers, and this embodiment provides a method with better effect, specifically as follows:
soaking ultra-high molecular weight polyethylene fibers in ethanol, ultrasonically cleaning, and drying; carrying out plasma treatment on the cleaned and dried ultra-high molecular weight polyethylene fibers; finally, immersing the ultra-high molecular weight polyethylene fiber subjected to plasma treatment in an ethanol/water mixed solution containing a silane coupling agent, reacting for 1-5 hours, taking out, and carrying out dehydration condensation reaction at 90-130 ℃ for 0.5-3 hours to obtain the ultra-high molecular weight polyethylene fiber with improved binding capacity. The purpose of doing so is to improve the surface roughness of the ultra-high molecular weight polyethylene fiber under the function of ensuring the performance of the ultra-high molecular weight polyethylene fiber, thereby improving the bonding capacity of the ultra-high molecular weight polyethylene fiber for standby.
Then, weighing the corresponding nano material according to the corresponding proportion of the ultra-high performance concrete, then dissolving the nano material in a gelatin solution, and performing ultrasonic dispersion, wherein in the embodiment, gelatin is mainly selected in consideration of the fact that the gelatin is solid at low temperature and starts to liquefy at about 30-34 ℃, and the nano material is separated from the ultra-high molecular weight polyethylene fiber under the stirring effect along with the liquefaction of the gelatin, and the nano material is uniformly distributed under the effect of the ultra-high molecular weight polyethylene fiber, so that the aim of uniform distribution is achieved after the separation of the nano material. The solid content of the gelatin solution is sufficient to achieve uniform adhesion of the nanomaterial, and a large amount of water can be added to submerge the gelatin when the gelatin solution is used.
Then adding the ultra-high molecular weight polyethylene fiber into gelatin solution, uniformly dispersing by ultrasonic, and freeze-drying, wherein the vacuum freeze-drying technology is a drying technology of freezing wet materials or solution into solid state at a lower temperature (-10 ℃ to-50 ℃), directly sublimating moisture in the wet materials or solution into gas state without liquid state under vacuum (1.3-13 Pa), and finally dehydrating the materials, so that the ultra-high molecular weight polyethylene fiber attached with gelatin can be obtained for standby. The purpose of this is to ensure uniform dispersion by ultrasonic dispersion, and then to ensure adhesion of the gelatin containing nanomaterial to the ultra-high molecular weight polyethylene fibers by vacuum freeze-drying techniques.
And then, mixing dry materials required by the ultra-high performance concrete, stirring uniformly, adding the high performance water reducer dry powder into the uniformly mixed dry materials, and stirring to fully and uniformly mix the dry materials and the high performance water reducer dry powder, wherein the step is a common preparation step of the ultra-high performance concrete, and the detailed description is omitted.
Then, the water was weighed according to a ratio of 0.18. Then, after weighing two thirds of dry materials and the mixture of the high-performance water reducing agent dry powder and all the obtained water are uniformly stirred, the aim is mainly to ensure that the water-cement ratio of the ultra-high-performance concrete is low, the fluidity is poor, the stirring is not utilized uniformly, and the amount of the water-cement ratio is reduced by one third, so that the water-cement ratio is high, the fluidity is good, and the uniform distribution of fibers is promoted.
Then, the ultra-high molecular weight polyethylene fiber to which gelatin is attached is added thereto and stirred uniformly. In this process, since the hydration process is an exothermic process, it heats the gelatin during the hydration process, thereby freeing the gelatin from the ultra-high molecular weight polyethylene fibers, which may be more uniformly distributed as it is stirred.
And after the stirring is finished, continuously adding the rest one third of the mixture of the dry material and the high-performance water reducing agent dry powder into the mixture, continuously stirring the mixture until the mixture is uniformly stirred, and stopping stirring the mixture after the concrete substrate reaches the ideal fluidity to obtain the ultra-high-performance concrete material.
Experiment: the ultra-high performance concrete material prepared in the embodiment 1 is manufactured into test blocks, after curing is completed, a plurality of holes are drilled for taking materials, and after observation by a scanning electron microscope, graphene oxide is found in a taking sample and is uniformly distributed, so that the aim of uniformly dispersing nano materials is fulfilled.
The present application is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present application without departing from the technical content of the present application still belong to the protection scope of the technical solution of the present application.
Claims (5)
1. The preparation method of the ultra-high performance concrete is characterized by comprising the following steps of:
a. firstly, weighing the required ultra-high molecular weight polyethylene fiber according to the corresponding proportion of the ultra-high performance concrete, carrying out surface modification, and improving the bonding capacity of the ultra-high molecular weight polyethylene fiber for later use;
b. then, weighing corresponding nano materials according to the corresponding proportion of the ultra-high performance concrete, and then, dissolving the nano materials in a gelatin solution for ultrasonic dispersion;
c. adding the ultra-high molecular weight polyethylene fiber prepared in the step a into gelatin solution, uniformly dispersing by ultrasonic, and freeze-drying to obtain the ultra-high molecular weight polyethylene fiber attached with gelatin for later use;
d. then, mixing dry materials required by the ultra-high performance concrete together and uniformly stirring;
e. then adding the high-performance water reducer dry powder into the uniformly mixed dry material, and stirring to fully and uniformly mix the dry material and the high-performance water reducer dry powder;
f. weighing the required water according to the proportion of the water to the gel ratio of 0.18;
g. then, weighing two thirds of the mixture of the dry material obtained in the step e and the high-performance water reducing agent dry powder, uniformly stirring the mixture with all the water obtained in the step f, adding the mixture into the step c to obtain the ultra-high molecular weight polyethylene fiber attached with gelatin, and uniformly stirring the ultra-high molecular weight polyethylene fiber attached with gelatin;
h. after the stirring is completed, continuously adding the rest one third of the mixture of the dry material and the high-performance water reducing agent dry powder into the mixture, continuously stirring the mixture until the mixture is uniformly stirred, and stopping stirring the mixture after the concrete substrate reaches the ideal fluidity to obtain the ultra-high-performance concrete material;
wherein, in the step a, the modification method of the ultra-high molecular weight polyethylene fiber comprises the following steps:
a1, soaking the ultra-high molecular weight polyethylene fibers in ethanol, performing ultrasonic cleaning and drying;
a2, carrying out plasma treatment on the cleaned and dried ultra-high molecular weight polyethylene fibers;
and a3, immersing the ultra-high molecular weight polyethylene fiber subjected to plasma treatment in an ethanol/water mixed solution containing a silane coupling agent, taking out after reacting for 1-5 hours, and carrying out dehydration condensation reaction at 90-130 ℃ for 0.5-3 hours to obtain the ultra-high molecular weight polyethylene fiber with improved binding capacity.
2. The method for preparing ultra-high performance concrete according to claim 1, characterized in thatIn the step b, the nano material is nano CaCO 3 Nano SiO 2 Nano Al 2 O 3 Nano MgO, carbon nano tube and graphene oxide.
3. The method for preparing ultra-high performance concrete according to claim 2, wherein in the step b, the solid content of the gelatin solution is sufficient to satisfy the adhesion of the nanomaterial.
4. The method for preparing ultra-high performance concrete according to claim 3, wherein in the step d, the dry materials are cement, silica fume, mineral powder, quartz powder and quartz sand.
5. The method for preparing ultra-high performance concrete according to claim 4, wherein in the step e, the high performance water reducing agent dry powder accounts for 2% of the mass of the dry material.
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