CN113831053A - Gradient concrete material with small bending deformation and preparation method thereof - Google Patents

Gradient concrete material with small bending deformation and preparation method thereof Download PDF

Info

Publication number
CN113831053A
CN113831053A CN202110972609.5A CN202110972609A CN113831053A CN 113831053 A CN113831053 A CN 113831053A CN 202110972609 A CN202110972609 A CN 202110972609A CN 113831053 A CN113831053 A CN 113831053A
Authority
CN
China
Prior art keywords
concrete
pouring
mixture
layer
uniformly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110972609.5A
Other languages
Chinese (zh)
Other versions
CN113831053B (en
Inventor
李悦
刘运泽
金彩云
李洪文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN202110972609.5A priority Critical patent/CN113831053B/en
Publication of CN113831053A publication Critical patent/CN113831053A/en
Application granted granted Critical
Publication of CN113831053B publication Critical patent/CN113831053B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C04B14/062—Microsilica, e.g. colloïdal silica
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/386—Carbon
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/46—Rock wool ; Ceramic or silicate fibres
    • C04B14/4681—Titanates
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • C04B24/045—Esters, e.g. lactones
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/124—Amides
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2623—Polyvinylalcohols; Polyvinylacetates
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2682—Halogen containing polymers, e.g. PVC
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E04C5/073—Discrete reinforcing elements, e.g. fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • 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)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Laminated Bodies (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a gradient concrete material with small flexural deformation and a preparation method thereof. In addition to the required conventional cement concrete raw materials, the concrete composite material also comprises performance adjusting materials such as titanium dioxide nanotubes, nano silicon dioxide, cobalt/carbon nanofiber composite materials, carbon nanofibers, chloroprene rubber, polyimide resin, dimethylacetamide, sodium polyacrylate, polyvinyl alcohol, octadecyl methacrylate, methyl cellulose and the like. The gradient layered preparation mode is adopted, namely the tensile layer, the transition layer and the compression layer are prepared in a layered mode. By adding different performance adjusting materials into each layer of concrete material, the flexural deformation of the material under the long-term load action can be greatly reduced, the damage of the flexural deformation to the engineering is reduced, and the concrete has important practical application value.

Description

Gradient concrete material with small bending deformation and preparation method thereof
Technical Field
The invention relates to the field of cement-based materials, in particular to a gradient concrete material with small bending deformation and a preparation method thereof.
Background
The concrete beam is the most common flexural member, and can generate flexural deformation and continuous increase of deflection under the action of continuous compressive stress, thereby influencing the durability and safety performance of the engineering structure. Therefore, the concrete deflection limit value is correspondingly regulated in the specification GB50010-2010 of concrete structure design. Because the bending deflection is obviously influenced by the composition, microstructure and the like of the cement-based material, the improvement of the resistance of the concrete material to bending deformation from the nano-micron layer has important significance.
At present, the improvement mode of the flexural deformation capability of the concrete material widely applied to the large-span structure is mainly to increase the sectional area of the member, improve the strength grade of the concrete and the like. However, the above method has the following problems: 1) along with the increase of the cross section area of the beam member, the self weight of the beam member can be obviously lifted, the bearing pressure of the structure is increased to a great extent, and particularly, the influence on a large-span structure with limited weight is great; 2) at present, the technical means for improving the strength of concrete materials mainly comprises the use of a lower water-cement ratio or the addition of a large amount of active cementing materials, but the risk of shrinkage cracking and the construction cost are obviously increased, and the increase of the cementing materials also obviously increases the carbon emission; 3) the solution of the microscopic level which plays a determining role in the macroscopic performance of the cement-based material is not carried out, and the performance of each part is not fully played aiming at the functions of different parts of the material when the material is subjected to bending deformation.
In order to solve the problems, the invention provides a gradient concrete material with small bending deformation and a preparation method thereof. The concrete beam prepared by the method has excellent mechanical properties, can obviously reduce the flexural deformation of the beam and improve the durability and safety performance of the concrete material, and the method is simple and convenient to implement, has lower cost and has important engineering practical popularization value.
Disclosure of Invention
The invention aims to provide a material design and a preparation method which can obviously reduce the flexural deformation of a concrete beam in practical engineering application. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a gradient concrete material with small bending deformation and a preparation method thereof. The material composition includes conventional cement concrete material and performance regulating material, and the composition and mixing amount of the performance regulating material3The content of the conventional cement concrete material and the performance adjusting material mixture) is: 0.8-1.4 kg/m titanium dioxide nanotube30.5-0.8 kg/m of cobalt/carbon nanofiber composite material30.4-0.8 kg/m of carbon nanofibers32-4 kg/m of nano silicon dioxide32-5 kg/m of chloroprene rubber36-9 kg/m sodium polyacrylate34 to 6kg/m of polyimide resin35-7 kg/m polyvinyl alcohol30.4-0.6 kg/m of dimethylacetamide3Octadecyl methacrylate 0.2 to 0.4kg/m30.3 to 0.5kg/m of methyl cellulose3。
The diameter of the titanium dioxide nanotube is 10 nm-30 nm, and the length of the titanium dioxide nanotube is 0.8-2 mu m; the particle size of the nano silicon dioxide is 20-40 nm, and the content is more than or equal to 99.5%; the carbon nanofibers in the cobalt/carbon nanofiber composite material have the diameter of 25-50 nm and the length of 10-20 mu m, and are prepared by using bacterial cellulose as a carbon source and adsorbing Co by utilizing rich oxygen-containing functional groups on the surface of the carbon source2+Then the product is prepared by freeze drying and one-step carbothermic reduction; the diameter of the carbon nanofiber is 150-200 nm, and the length of the carbon nanofiber is 10-20 μm.
The chloroprene rubber and the sodium polyacrylate are binders of titanium dioxide nanotubes, nano silicon dioxide and cement-based materials; the polyimide resin and the dimethylacetamide are binders of the cobalt/carbon nanofiber composite material and the cement-based material; the polyvinyl alcohol and the octadecyl methacrylate are used as binders of the carbon nanofibers and the cement-based material. The methyl cellulose is used for dispersing the cobalt/carbon nanofiber composite and the carbon nanofiber.
The gradient concrete material with small flexural deformation and the preparation method thereof are as follows:
pouring the tension layer, the transition layer and the compression layer from bottom to top according to the thickness and the stress direction of the beam, wherein the thickness ratio of each layer is 2: 1: 2. preparation of tension layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the carbon nanofibers into a methylcellulose aqueous solution with the mass concentration of 2% -4% for dispersion, then adding a mixture of polyvinyl alcohol and octadecyl methacrylate which have a bonding effect, uniformly stirring, heating in a water bath for 60min, controlling the water bath temperature to be 40-45 ℃, cooling to the ambient temperature, standing for 30min, pouring into the concrete, fully stirring, pouring into a mold after uniform stirring, and uniformly shaking by using a vibrating rod.
Preparing a transition layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the cobalt/carbon nanofiber composite material into a methylcellulose aqueous solution for dispersion, adding the mixture into a base solution of polyimide resin and dimethylacetamide which have the function of enhancing bonding after the mixture is completely dispersed, uniformly stirring the mixture, then carrying out water bath at 40-45 ℃ for 15min, and standing the mixture for 20 min. And finally, pouring the mixture into concrete for fully stirring, pouring the mixture into a mould after the mixture is uniformly stirred, and vibrating the mixture uniformly by using a vibrating rod.
Preparation of the compression layer: weighing the performance adjusting materials according to the proportion of the concrete dosage, firstly mixing chloroprene rubber and sodium polyacrylate and uniformly stirring to prepare a binder, adding the binder into water required by sample preparation, then pouring titanium dioxide nanotubes and nano-silica into the binder, fully stirring and dispersing uniformly, standing for 15-20 min, heating in a water bath for 45min, controlling the water bath temperature to be 35-40 ℃, cooling and standing for 30min, pouring into concrete, fully stirring, pouring into a mould after uniformly stirring, and uniformly shaking by using a vibrating bar.
Compared with the prior art, the invention has the advantages that:
1) the deformation of the bent material in the actual engineering is mainly bending deformation. The flexural material is divided into three layers according to the height, the upper part 2/5 is recorded as a compression layer, the middle part 1/5 is recorded as a transition layer, and the lower part 2/5 is recorded as a tension layer, and the gradient preparation method is creatively adopted, so that the integral stability of the material is ensured, the working performance of the compression zone, the transition zone and the tension zone is fully exerted, and the long-term deformation is reduced to the maximum extent.
2) In the tension layer of the material, the carbon nanofibers with extremely high toughness and excellent mechanical property are used as an internal reinforcing net, and all phases of the cement-based material which is originally simply bonded by gel are built into a more compact whole through the carbon nanofibers from the microstructure. And binding reinforcement of the nano carbon fiber and the aggregate phase is performed by using a binding agent made of polyvinyl alcohol and octadecyl methacrylate.
The ability of the pull zone to resist tensile deformation is significantly improved.
3) When the transition layer is prepared, the cobalt/carbon nanofiber composite material is added, so that the flexibility of the cement-based material of the transition layer is increased, and the buffering effect of the transition part is fully exerted. Meanwhile, the polyimide resin and the dimethylacetamide are added, so that the cobalt/carbon nanofiber composite material and the cement-based material can be fully bonded, and the integrity is improved.
4) In the compression layer of the flexural material, titanium dioxide nanotubes and nano-silica with small particle size and better pressure bearing performance are used as the filling stabilizing material for resisting extrusion deformation. The titanium dioxide nanotubes and the nano-silica are fully bonded at microscopic pores of the material through a bonding agent formed by the chloroprene rubber and the sodium polyacrylate. With the continuous hydration reaction of the nanometer silicon dioxide with very high activity, the overall bonding degree of the titanium dioxide nanometer tube and the surrounding materials is further increased.
5) The small-deformation multi-gradient cement-based material and the preparation method thereof provided by the invention have the advantages that the used material is economic and environment-friendly, and the preparation process is easy to operate and realize. The capability of resisting bending deformation of the cement-based material can be greatly improved, and the method has wide popularization value of practical engineering.
Drawings
FIG. 1C30 is a 60-day deflection curve of a concrete beam.
FIG. 2C50 is a 60-day deflection curve of a concrete beam.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
first, two groups of C30 strength concrete beams having a length of 1200mm, a width of 120mm and a height of 250mm were produced, the first group being beams containing no performance adjusting material and being designated as group A1. The other group was prepared according to the method proposed by the present invention and is denoted as group B1. The required amounts of materials were, group a 1: selecting according to the design rule of common concrete mix proportion JGJ 552011; group B1: except that the conventional raw materials are selected according to the design rule of common concrete mix proportion JGJ552011, the performance adjusting materials respectively adopt 0.036kg of titanium dioxide nanotubes with the diameter range of 10-20 nm, the length of 0.8-2 mu m, 0.1kg of nano silicon dioxide particles with the particle diameter range of 20-30 nm, 0.0324kg of cobalt/carbon nano fiber composite material with the diameter of 25-40 nm and the length of 10-20 mu m, 0.019kg of nano carbon fibers with the diameter of 150-200 nm and the length of 10-15 mu m, 0.112kg of chloroprene rubber, 0.24kg of sodium polyacrylate, 0.18kg of polyimide resin, 0.0144kg of methyl cellulose, 0.216kg of polyvinyl alcohol, 0.01kg of octadecyl methacrylate and 0.018kg of dimethylacetamide.
The concrete flexural beam is then prepared. The A1 group concrete beam is prepared by integrally mixing and pouring according to a conventional method. B1 groups are poured by a tension layer, a transition layer and a compression layer from bottom to top according to the thickness and the stress direction of the beam, and the thickness ratio of each layer is 2: 1: 2. firstly, preparing a tension layer: weighing the performance adjusting materials according to the proportion of the concrete dosage, firstly pouring the carbon nanofibers into a methylcellulose aqueous solution with the mass concentration of 2.4% for dispersion, then adding a mixture of polyvinyl alcohol and octadecyl methacrylate which have the function of bonding, uniformly stirring, heating in a water bath for 60min, controlling the water bath temperature to 40 ℃, cooling to the ambient temperature, standing for 30min, pouring into the concrete, fully stirring, pouring into a mould after uniform stirring, and uniformly shaking by using a vibrating bar. Secondly, preparing a transition layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the cobalt/carbon nano-fiber composite material into a methylcellulose aqueous solution for dispersion, adding the mixture into a base solution of polyimide resin and dimethylacetamide which have the function of enhancing bonding after the mixture is completely dispersed, uniformly stirring the mixture, then carrying out water bath at 40 ℃ for 15min, and standing the mixture for 20 min. And finally, pouring the mixture into concrete for fully stirring, pouring the mixture into a mould after the mixture is uniformly stirred, and vibrating the mixture uniformly by using a vibrating rod. The preparation of the pressed layer follows: weighing the performance adjusting materials according to the proportion of the concrete dosage, firstly mixing chloroprene rubber and sodium polyacrylate and uniformly stirring to prepare a binder, adding the binder into water required by sample preparation, then pouring titanium dioxide nanotubes and nano-silica into the binder, fully stirring and uniformly dispersing, standing for 15min, heating in a water bath for 45min, controlling the water bath temperature to be 35 ℃, cooling and standing for 30min, then pouring into concrete, fully stirring, pouring into a mould after uniform stirring, and uniformly shaking by using a vibrating bar. Finally, the deflection test of 60 days is carried out by placing the balance weight blocks with the same weight on the upper parts of the two groups of beams after the standard maintenance is finished, so as to compare the flexural deflection development conditions of the two groups of beams, and the result is shown in figure 1. It can be seen that the flexural deflection change of the concrete prepared by the method is obviously smaller than that of the concrete prepared by the conventional method, and the deflection reduction rate in the same period is between 36.6 and 44.8 percent.
Example two:
first, two groups of C50 strength concrete beams were made 1600mm in length, 150mm in width and 300mm in height, the first group being beams without performance adjusting materials and designated as group a 2. The other group, prepared according to the process proposed by the present invention, is denoted as group B2. The required amounts of materials were, group a 2: selecting according to the design rule of common concrete mix proportion JGJ 552011; group B2: except that the conventional raw materials are selected according to 'common concrete mix proportion design rule' JGJ552011, 0.072kg of titanium dioxide nanotubes with the diameter range of 10-20 nm and the length of 0.8-2 mu m, 0.216kg of nano silicon dioxide particles with the particle diameter range of 20-30 nm, 0.068kg of cobalt/carbon nanofiber composite material with the diameter of 25-40 nm and the length of 10-20 mu m, 0.043kg of carbon nanofibers with the diameter of 150-200 nm and the length of 10-15 mu m, 0.252kg of chloroprene rubber, 0.52kg of sodium polyacrylate, 0.36kg of polyimide resin, 0.028kg of methyl cellulose, 0.432kg of polyvinyl alcohol, 0.022kg of octadecyl methacrylate and 0.0375kg of dimethylacetamide are taken.
The concrete flexural beam is then prepared. The A2 group concrete beam is prepared by integrally mixing and pouring according to a conventional method. B2 groups are poured by a tension layer, a transition layer and a compression layer from bottom to top according to the thickness and the stress direction of the beam, and the thickness ratio of each layer is 2: 1: 2. firstly, preparing a tension layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the carbon nanofibers into a methyl cellulose aqueous solution with the mass concentration of 3% for dispersion, then adding a mixture of polyvinyl alcohol and octadecyl methacrylate which have the function of bonding, uniformly stirring, heating in a water bath for 60min, controlling the water bath temperature to 45 ℃, cooling to the ambient temperature, standing for 30min, pouring into the concrete, fully stirring, pouring into a mold after uniform stirring, and uniformly shaking by using a vibrating bar. Secondly, preparing a transition layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the cobalt/carbon nano-fiber composite material into a methylcellulose aqueous solution for dispersion, adding the mixture into a base solution of polyimide resin and dimethylacetamide which have the function of enhancing bonding after the mixture is completely dispersed, uniformly stirring the mixture, then carrying out water bath at 45 ℃ for 15min, and standing the mixture for 20 min. And finally, pouring the mixture into concrete for fully stirring, pouring the mixture into a mould after the mixture is uniformly stirred, and vibrating the mixture uniformly by using a vibrating rod. The preparation of the pressed layer follows: weighing the performance adjusting materials according to the proportion of the concrete dosage, firstly mixing chloroprene rubber and sodium polyacrylate and uniformly stirring to prepare a binder, adding the binder into water required by sample preparation, then pouring titanium dioxide nanotubes and nano-silica into the binder, fully stirring and uniformly dispersing, standing for 20min, heating in a water bath for 45min, controlling the water bath temperature to be 40 ℃, cooling and standing for 30min, then pouring into concrete, fully stirring, pouring into a mould after uniform stirring, and uniformly shaking by using a vibrating bar. Finally, the deflection test of 60 days is carried out by placing the balance weight blocks with the same weight on the upper parts of the two groups of beams after the standard maintenance is finished, so as to compare the flexural deflection development conditions of the two groups of beams, and the result is shown in figure 2. It can be seen that the flexural deflection change of the concrete prepared by the method is obviously smaller than that of the concrete prepared by the conventional method, and the deflection reduction rate in the same period is between 31.8 and 41.4 percent.
The above embodiments fully verify the superiority of the practical effect of the present invention. However, the above examples are only for the purpose of clarity of illustration and are not intended to limit the scope of the test. In the actual engineering operation, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from its scope.

Claims (3)

1. A gradient concrete material with small flexural deformation is characterized in that: the material composition comprises a cement concrete material and a performance adjusting material, and accounts for every m3Calculating the content of the mixture of the cement concrete material and the performance adjusting material, wherein the composition and the mixing amount of the performance adjusting material are as follows: 0.8-1.4 kg/m titanium dioxide nanotube30.5-0.8 kg/m of cobalt/carbon nanofiber composite material30.4-0.8 kg/m of carbon nanofibers32-4 kg/m of nano silicon dioxide32-5 kg/m of chloroprene rubber36-9 kg/m sodium polyacrylate34 to 6kg/m of polyimide resin35-7 kg/m polyvinyl alcohol30.4-0.6 kg/m of dimethylacetamide3Octadecyl methacrylate 0.2 to 0.4kg/m30.3 to 0.5kg/m of methyl cellulose3。
2. A gradient concrete material having a low flexural deformation according to claim 1, wherein: the diameter of the titanium dioxide nanotube is 10 nm-30 nm, and the length of the titanium dioxide nanotube is 0.8-2 mu m; the particle size of the nano silicon dioxide is 20-40 nm, and the content is more than or equal to 99.5%; the diameter of the carbon nanofiber in the cobalt/carbon nanofiber composite material is 25-50 nm, and the length of the carbon nanofiber composite material is 10-20 mu m; the diameter of the carbon nanofiber is 150-200 nm, and the length of the carbon nanofiber is 10-20 μm.
3. A method of producing a gradient concrete material having a low flexural deformation according to claim 1, characterized by the steps of:
1) pouring the tension layer, the transition layer and the compression layer from bottom to top according to the thickness and the stress direction of the beam, wherein the thickness ratio of each layer is 2: 1: 2;
2) preparation of tension layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the carbon nanofibers into a methylcellulose aqueous solution with the mass concentration of 2% -4% for dispersion, then adding a mixture of polyvinyl alcohol and octadecyl methacrylate which have a bonding effect, uniformly stirring, heating in a water bath for 60min, controlling the water bath temperature to be 40-45 ℃, cooling to the ambient temperature, standing for 30min, pouring into the concrete, fully stirring, pouring into a mold after uniform stirring, and uniformly shaking by using a vibrating rod;
3) preparing a transition layer: weighing the performance adjusting material according to the proportion of the concrete dosage, firstly pouring the cobalt/carbon nanofiber composite material into a methylcellulose aqueous solution for dispersion, adding the mixture into a base solution of polyimide resin and dimethylacetamide which have the function of enhancing bonding after the mixture is completely dispersed, uniformly stirring the mixture, then carrying out water bath at 40-45 ℃ for 15min, and immediately standing the mixture for 20 min; finally, pouring the mixture into concrete for fully stirring, pouring the mixture into a mould after the mixture is uniformly stirred, and vibrating the mixture uniformly by using a vibrating rod;
4) preparation of the compression layer: weighing the performance adjusting materials according to the proportion of the concrete dosage, firstly mixing chloroprene rubber and sodium polyacrylate and uniformly stirring to prepare a binder, adding the binder into water required by sample preparation, then pouring titanium dioxide nanotubes and nano-silica into the binder, fully stirring and dispersing uniformly, standing for 15-20 min, heating in a water bath for 45min, controlling the water bath temperature to be 35-40 ℃, cooling and standing for 30min, pouring into concrete, fully stirring, pouring into a mould after uniformly stirring, and uniformly shaking by using a vibrating bar.
CN202110972609.5A 2021-08-24 2021-08-24 Gradient concrete material with small bending deformation and preparation method thereof Active CN113831053B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110972609.5A CN113831053B (en) 2021-08-24 2021-08-24 Gradient concrete material with small bending deformation and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110972609.5A CN113831053B (en) 2021-08-24 2021-08-24 Gradient concrete material with small bending deformation and preparation method thereof

Publications (2)

Publication Number Publication Date
CN113831053A true CN113831053A (en) 2021-12-24
CN113831053B CN113831053B (en) 2022-09-09

Family

ID=78961027

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110972609.5A Active CN113831053B (en) 2021-08-24 2021-08-24 Gradient concrete material with small bending deformation and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113831053B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117846211A (en) * 2023-12-28 2024-04-09 广东工业大学 3D printing low-carbon optimized deformed concrete slab and preparation process thereof

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001234502A (en) * 1999-12-13 2001-08-31 Earth Kobo:Kk Decorative gradient-function permeable composition and its manufacturing method
EP2006259A2 (en) * 2007-05-01 2008-12-24 Owens-Corning Intellectual Capital, LLC Concrete product with enhanced ornamental surface layer
CN103011730A (en) * 2012-12-31 2013-04-03 东南大学 Fibre-polymer compound toughened concrete and preparation method for same
CN104563389A (en) * 2014-12-22 2015-04-29 扬州大学 High-strength reinforced and functionally-graded concrete beam
CN107129227A (en) * 2015-10-14 2017-09-05 东南大学 A kind of preparation method of pavement of road or airfield pavement paving structure
CN108424035A (en) * 2018-04-19 2018-08-21 中原工学院 A kind of preparation method of polymer water cement foaming agent and its foamed concrete
CN109485331A (en) * 2018-11-08 2019-03-19 刘元雪 Double gradient highly energy-consuming concrete and underground engineering protective buffering layer fill method
CN112062516A (en) * 2020-07-31 2020-12-11 中国人民解放军军事科学院国防工程研究院工程防护研究所 Novel gradient engineering material and preparation method thereof
CN113152784A (en) * 2021-04-08 2021-07-23 扬州大学 Laminated beam and preparation method thereof
CN213979574U (en) * 2020-10-21 2021-08-17 广州大学 Gradient function beam

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001234502A (en) * 1999-12-13 2001-08-31 Earth Kobo:Kk Decorative gradient-function permeable composition and its manufacturing method
EP2006259A2 (en) * 2007-05-01 2008-12-24 Owens-Corning Intellectual Capital, LLC Concrete product with enhanced ornamental surface layer
CN103011730A (en) * 2012-12-31 2013-04-03 东南大学 Fibre-polymer compound toughened concrete and preparation method for same
CN104563389A (en) * 2014-12-22 2015-04-29 扬州大学 High-strength reinforced and functionally-graded concrete beam
CN107129227A (en) * 2015-10-14 2017-09-05 东南大学 A kind of preparation method of pavement of road or airfield pavement paving structure
CN108424035A (en) * 2018-04-19 2018-08-21 中原工学院 A kind of preparation method of polymer water cement foaming agent and its foamed concrete
CN109485331A (en) * 2018-11-08 2019-03-19 刘元雪 Double gradient highly energy-consuming concrete and underground engineering protective buffering layer fill method
CN112062516A (en) * 2020-07-31 2020-12-11 中国人民解放军军事科学院国防工程研究院工程防护研究所 Novel gradient engineering material and preparation method thereof
CN213979574U (en) * 2020-10-21 2021-08-17 广州大学 Gradient function beam
CN113152784A (en) * 2021-04-08 2021-07-23 扬州大学 Laminated beam and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
沃丁柱: "《复合材料大全》", 31 January 2000 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117846211A (en) * 2023-12-28 2024-04-09 广东工业大学 3D printing low-carbon optimized deformed concrete slab and preparation process thereof

Also Published As

Publication number Publication date
CN113831053B (en) 2022-09-09

Similar Documents

Publication Publication Date Title
Wang et al. Effect and mechanisms of nanomaterials on interface between aggregates and cement mortars
CN104030634B (en) A kind of high-strength and high ductility RPC of carbon-doped nanometer tube and preparation method thereof
Mansur et al. Stress-strain relationship of high-strength fiber concrete in compression
EP2493829B1 (en) Material to be used as a concrete additive
CN111792890A (en) Full-scale fiber toughened ultrahigh-performance concrete and preparation method thereof
CN108529968A (en) A kind of fiber concrete material and preparation method thereof for 3D printing
JP2014037348A (en) Concrete mixture
CN106007553A (en) Carbon nanotube/polyvinyl alcohol high-tenacity intelligent cement mortar and preparation thereof
CN113831053B (en) Gradient concrete material with small bending deformation and preparation method thereof
CN113072343A (en) Steel fiber cement-based composite material reinforced based on nano scale and preparation method thereof
Chekravarty et al. Effect of using nano silica on mechanical properties of normal strength concrete
Sarika A study on properties of reactive powder concrete
CN111960769A (en) Novel nano modified high-strength concrete
WO2021056934A1 (en) Reinforced concrete internal curing high-water-absorption microsphere material and preparation method therefor
Sun et al. Multiple effects of nano-CaCO3 and modified polyvinyl alcohol fiber on flexure–tension-resistant performance of engineered cementitious composites
CN104496337A (en) Nano-clay modified fiber cement mortar and preparation method thereof
CN113896482A (en) Ultra-light high-strength concrete and preparation method thereof
CN112830743A (en) 3D printing high-ductility color concrete
Awan et al. Carbon nano fibre reinforcements in concrete
Arbelaiz et al. Natural fiber–reinforced cement mortar composite physicomechanical properties: from cellulose microfibers to nanocellulose
Bai et al. Effect of nanocellulose on early hydration and microstructure of cement paste under low and high water-cement ratios
Suresha et al. Morphology and physico-mechanical properties of basalt fiber reinforced composites
Sounthararajan et al. Effects on dual fibres to act as reinforcement in a composite matrix along with sugarcane bagasse ash in conventional concrete
Meng et al. Study on Splitting Tensile Mechanical Properties of Carbon Fiber/Polymer Latex Powder Composite Modified Concrete
CN111908860A (en) Cold region crack self-healing ultrahigh-performance cement-based composite material and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant