CN111592252A - High-performance anti-cracking impact-resistant modified concrete and preparation method thereof - Google Patents
High-performance anti-cracking impact-resistant modified concrete and preparation method thereof Download PDFInfo
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- CN111592252A CN111592252A CN202010480679.4A CN202010480679A CN111592252A CN 111592252 A CN111592252 A CN 111592252A CN 202010480679 A CN202010480679 A CN 202010480679A CN 111592252 A CN111592252 A CN 111592252A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B16/0633—Polypropylene
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B16/065—Polyacrylates; Polymethacrylates
- C04B16/0658—Polyacrylonitrile
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/54—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polymers of unsaturated nitriles
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- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-performance anti-cracking impact-resistant modified concrete and a preparation method thereof. According to the invention, the modified polyacrylonitrile fiber can improve the stress resistance of early concrete, prevent early cracks from being generated and improve the early crack resistance of the concrete, the modified polyacrylonitrile fiber can increase the absorption of stress energy to the outside and improve the absorption of impact energy of the whole concrete, so that the impact resistance of the concrete is improved, the contact area of the modified polypropylene coarse fiber and the concrete is increased, the rough fiber surface enables the modified concrete to absorb more energy in the later-stage damage process, so that the toughening purpose is achieved, the change of the concrete from brittle damage to ductile damage is realized, the two fibers play different roles in the common concrete, and finally the modified concrete with good crack resistance and impact resistance is obtained.
Description
Technical Field
The invention relates to the technical field of concrete modification, in particular to high-performance anti-cracking impact-resistant modified concrete and a preparation method thereof.
Background
The concrete is a general term for engineering composite materials formed by cementing aggregate into a whole by cementing materials, and the term concrete generally refers to cement concrete which is prepared by mixing cement as the cementing material, sand and stone as the aggregate and water (with or without additives and admixtures) according to a certain proportion, stirring, molding and curing, and is also called ordinary concrete.
However, since the properties of concrete such as crack resistance and impact resistance are related to the engineering quality of building construction, in order to further improve the service performance and construction quality of concrete, a modifier is added to improve certain properties (strength) of concrete according to the use requirement, so that the concrete has excellent properties, and the obtained modified concrete meets the actual building construction requirement, therefore, a high-performance modified concrete is needed to improve the crack resistance and impact resistance of common concrete.
Disclosure of Invention
The invention aims to solve the problems and provides high-performance anti-cracking and anti-impact modified concrete and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-performance anti-cracking and impact-resistant modified concrete and a preparation method thereof are disclosed, wherein reinforcing fibers are doped in the concrete to improve the anti-cracking and impact-resistant capability of the concrete, and the reinforcing fibers are composed of modified polypropylene coarse fibers and modified polyacrylonitrile fibers with different sizes.
As a further description of the above technical solution:
the modified polypropylene crude fiber has the length of 45-55mm and the diameter of 1.0-1.5 mm.
As a further description of the above technical solution:
the length of the modacrylic fiber is between 6 and 8mm, and the diameter of the modacrylic fiber is between 0.06 and 0.09 mm.
As a further description of the above technical solution:
the content of the modified polypropylene fiber in concrete is 5kg/m3-10kg/m3The modified polyacrylonitrile fiber is in concreteIs 0kg/m3-5kg/m3。
As a further description of the above technical solution:
the modified polypropylene crude fiber is obtained by chemically surface-modifying polypropylene particles through one or more than one of organic modifier, silane coupling agent and electrodeless modified filler.
As a further description of the above technical solution:
the organic modifier is one or more than one mixture of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene and polyethylene glycol, the coupling agent is one or more than one mixture of silane coupling agent Si-69, KH570, KH550, KH151, silica gel anti-blocking agent and Tetraethoxysilane (TEOS), and the inorganic modified filler is one or more than one mixture of talcum powder, kaolin, silica, diatomite, montmorillonite and hydrotalcite.
As a further description of the above technical solution:
the modified polyacrylonitrile fiber is prepared by mixing starch, cerium oxide nano powder, dimethyl sulfoxide, polyacrylonitrile, dimethylformamide, graphene nano powder and powdered activated carbon in proportion, spinning by a wet spinning method, and placing in an electric field of 3-18 KV/cm.
As a further description of the above technical solution:
a preparation method of high-performance anti-cracking impact-resistant modified concrete comprises the following steps:
s1, mixing one or more of organic modifier, silane coupling agent and inorganic modified filler with polypropylene particles in proportion, and performing melt stretching to prepare modified polypropylene fibers;
s2, firstly, dissolving fully dried starch and cerium oxide in dimethyl sulfoxide according to a mass ratio to prepare a solution A, secondly, dissolving polyacrylonitrile in dimethyl formamide to form a solution B, then, mixing the solution A and the solution B in proportion to obtain a solution C, then, adding graphene nano powder and powdered activated carbon into the solution C to obtain a solution D, and finally, spinning the solution D by a wet spinning method, wherein an electric field of 3-18KV/cm is additionally applied during spinning;
s3, after the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are prepared according to the method, the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are put into concrete and fully stirred until the mixture is uniform, and the modified concrete is obtained.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: modified polypropylene crude fibers and modified polyacrylonitrile fibers with different sizes are added into common concrete and are uniformly stirred to obtain modified concrete, wherein, the modified polyacrylonitrile fiber can improve the stress resistance of the early concrete, thereby preventing the generation of early cracks and improving the early crack resistance of the concrete, and the modified polyacrylonitrile fiber can increase the absorption of stress energy to the outside, improve the absorption of impact energy by the whole concrete, thereby improving the shock resistance of the concrete, increasing the contact area of the modified polypropylene coarse fibers and the concrete, absorbing more energy in the later damage process of the modified concrete due to the rough fiber surface, thereby achieving the purpose of toughening, realizing the change of the concrete from brittle failure to ductile failure, and finally obtaining the modified concrete with good crack resistance and impact resistance by the two fibers playing different roles in the common concrete.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a high-performance anti-cracking and anti-impact modified concrete and its preparing method, the concrete is doped with reinforced fiber to improve the anti-cracking and anti-impact ability of the concrete, the reinforced fiber is composed of modified polypropylene coarse fiber and modified polyacrylonitrile fiber with different sizes, the early shaping crack of the concrete is mainly generated by the bleeding of water or cement paste, the sedimentation of coarse aggregate and temperature stress, the crack is generated when the stress is larger than the strength of the concrete, the anti-stress ability of the early concrete is improved by adding modified polyacrylonitrile fiber into the concrete, thereby preventing the early crack generation and improving the early anti-cracking ability of the concrete, besides, the concrete is a brittle material which is easy to generate brittle fracture when being impacted, the absorption of stress energy can be increased by adding modified polyacrylonitrile fiber, the absorption of the impact energy by the whole concrete is improved, so that the impact resistance of the concrete is improved; the fiber form of the modified polypropylene coarse fiber is mainly wave-shaped, surface nick, X-shaped cross section or rectangular film, so that the fiber surface is a non-smooth surface, the contact area of the modified polypropylene coarse fiber and concrete is increased, the damage form of the concrete mixed with the modified polypropylene fiber is mainly the extraction of the fiber, and the rough fiber surface ensures that the modified concrete absorbs more energy in the later damage process, so that the toughening purpose is achieved, the change of the concrete from brittle damage to toughness damage is realized, and finally the modified concrete with good crack resistance and impact resistance is obtained by adding the modified polypropylene fiber and the modified polyacrylonitrile fiber.
Example two:
different from the first embodiment
Referring to Table 1, the modified polypropylene crude fiber has a length of 45-55mm and a diameter of 1.0-1.5 mm.
Referring to Table 2, the modacrylic fibers were between 6 and 8mm in length and between 0.06 and 0.09mm in diameter.
Cracking resistance of concrete: the concrete crack resistance refers to the cracking resistance of the concrete, the cracking resistance of the concrete is comprehensive performance, and the cracking resistance has a certain relation with the breaking strength, the ultimate tensile deformation capacity, the tensile elastic modulus, the autogenous volume deformation, the creep and the thermal performance.
Breaking strength: the breaking strength refers to the ratio of the tensile force when the material breaks to the cross-sectional area of the break, namely the stress.
Tensile modulus of elasticity: the ratio of tensile stress to strain of a material in a stressed state is defined as follows: the elastic modulus can be regarded as an index for measuring the difficulty of the material in elastic deformation, and the larger the value of the elastic modulus is, the larger the stress for causing the material to generate certain elastic deformation is, namely, the larger the tensile strength of the material is.
The following table shows the test data of breaking strength and tensile elastic modulus of the modified polypropylene crude fiber and the modified polyacrylonitrile fiber respectively under the same realization condition:
TABLE 1 test data for breaking strength and tensile elastic modulus of crude fibers of modified polypropylene of different sizes
TABLE 2 fracture Strength and tensile elastic modulus test data for modacrylic fibers of various sizes
From the experimental data of the table above, it can be seen that: the modified polypropylene coarse fiber has the length of 45-55mm, the diameter of 1.0-1.5mm, the modified polyacrylonitrile fiber has the length of 6-8mm and the diameter of 0.06-0.09mm, the breaking strength and the tensile modulus are the maximum, namely the modified concrete added into the concrete has the best anti-cracking and anti-impact capability.
Example three:
the difference from the second embodiment is
Referring to tables 3 and 4, the content of the modified polypropylene crude fiber in the concrete was 5kg/m3-10kg/m3The content of the modified polyacrylonitrile fiber in the concrete is 0kg/m3-5kg/m3。
The following table shows the test data of breaking strength and tensile elastic modulus of the modified polypropylene crude fiber and the modified polyacrylonitrile fiber added with different contents in the common concrete under the same realization condition respectively:
TABLE 3 test data of breaking strength and tensile elastic modulus of modified concrete obtained by adding modified polypropylene crude fiber with different contents into concrete
TABLE 4 fracture Strength and tensile elastic modulus test data of modified concrete obtained by adding modified Polyacrylonitrile fiber with different contents into concrete
Obtained according to the above experimental data: the recommended addition content of the modified polypropylene crude fiber doped in the concrete is 5kg/m3-10kg/m3The addition content of the modified polyacrylonitrile fiber in the concrete is 0kg/m3-5kg/m3In addition, the performance of the concrete can be improved to the maximum extent, and the crack resistance and the impact resistance of the modified concrete are improved.
Example four:
different from the first embodiment
The modified polypropylene crude fiber is obtained by chemically surface-modifying polypropylene particles through one or more than one of an organic modifier, a silane coupling agent and an electrodeless modified filler, wherein the organic modifier provides hydrophilic groups for the polypropylene fiber, so that the defect that the polypropylene fiber is not hydrophilic is overcome, the affinity with concrete is improved, the silane coupling agent enables the surface of the polypropylene fiber to generate silicon-oxygen groups Si-O, when the concrete is hydrated and hardened, the silicon-oxygen groups on the fiber also participate in reaction, so that the fiber is chemically cross-linked with the concrete, the inorganic modified filler enables the surface of the polypropylene fiber to generate silicon dioxide, when the concrete is hydrated and hardened, the silicon dioxide on the fiber also participates in reaction, so that the chemical cross-linking with the concrete is further improved, and the modified polypropylene crude fiber has good affinity and binding power with the concrete, thereby greatly improving the reinforcing effect of the fiber in the concrete.
The organic modifier is one or more of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene and polyethylene glycol, the inorganic modified filler is one or more of talcum powder, kaolin, silica, diatomite, montmorillonite and hydrotalcite, the silane coupling agent is one or more of silane coupling agent Si-69, KH570, KH550, KH151, silica anti-blocking agent and Tetraethoxysilane (TEOS), and the inorganic modified filler is one or more of talcum powder, kaolin, silica, diatomite, montmorillonite and hydrotalcite.
The modified polyacrylonitrile fiber is prepared by mixing starch, cerium oxide nano powder, dimethyl sulfoxide, polyacrylonitrile, dimethylformamide, graphene nano powder and powdered activated carbon in proportion, spinning by a wet spinning method, and placing in an electric field of 3-18 KV/cm.
Example five:
a preparation method of high-performance anti-cracking impact-resistant modified concrete comprises the following steps:
s1, mixing one or more of organic modifier, silane coupling agent and inorganic modified filler with polypropylene particles in proportion, and performing melt stretching to prepare modified polypropylene fibers;
s2, firstly, dissolving fully dried starch and cerium oxide in dimethyl sulfoxide according to a mass ratio to prepare a solution A, secondly, dissolving polyacrylonitrile in dimethyl formamide to form a solution B, then, mixing the solution A and the solution B in proportion to obtain a solution C, then, adding graphene nano powder and powdered activated carbon into the solution C to obtain a solution D, and finally, spinning by adopting a wet spinning method, wherein an electric field of 3-18KV/cm is additionally applied during spinning;
s3, after the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are prepared according to the method, the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are put into concrete and fully stirred until the mixture is uniform, and the modified concrete is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A high-performance anti-cracking and impact-resistant modified concrete and a preparation method thereof are disclosed, wherein reinforcing fibers are doped in the concrete to improve the anti-cracking and impact-resistant capability of the concrete, and the high-performance anti-cracking and impact-resistant modified concrete is characterized in that the reinforcing fibers consist of modified polypropylene coarse fibers and modified polyacrylonitrile fibers with different sizes.
2. The concrete of claim 1, wherein the modified polypropylene coarse fibers have a length of 45-55mm and a diameter of 1.0-1.5 mm.
3. The concrete of claim 1, wherein the modacrylic fiber has a length of 6-8mm and a diameter of 0.06-0.09 mm.
4. The concrete of claim 1, wherein the modified polypropylene fiber is present in the concrete in an amount of 5kg/m3-10kg/m3The content of the modified polyacrylonitrile fiber in the concrete is 0kg/m3-5kg/m3。
5. The concrete of claim 1, wherein the modified polypropylene coarse fibers are obtained by chemically surface-modifying polypropylene particles with one or more of organic modifiers, silane coupling agents, and non-polar modified fillers.
6. The concrete of claim 5, wherein the organic modifier is one or more of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene and polyethylene glycol, the coupling agent is one or more of silane coupling agent Si-69, KH570, KH550, KH151, silica gel anti-blocking agent and Tetraethoxysilane (TEOS), and the inorganic modified filler is one or more of talc powder, kaolin, silica, diatomite, montmorillonite and hydrotalcite.
7. The high-performance anti-cracking impact-resistant modified concrete and the preparation method thereof according to claim 1, wherein the modified polyacrylonitrile fiber is prepared by mixing starch, cerium oxide nano powder, dimethyl sulfoxide, polyacrylonitrile, dimethylformamide, graphene nano powder and powdered activated carbon in proportion, spinning by a wet spinning method, and placing in an electric field of 3-18 KV/cm.
8. The preparation method of the high-performance anti-cracking impact-resistant modified concrete according to claim 1, comprising the following steps:
s1, mixing one or more of organic modifier, silane coupling agent and inorganic modified filler with polypropylene particles in proportion, and performing melt stretching to prepare modified polypropylene fibers;
s2, firstly, dissolving fully dried starch and cerium oxide in dimethyl sulfoxide according to a mass ratio to prepare a solution A, secondly, dissolving polyacrylonitrile in dimethyl formamide to form a solution B, then, mixing the solution A and the solution B in proportion to obtain a solution C, then, adding graphene nano powder and powdered activated carbon into the solution C to obtain a solution D, and finally, spinning the solution D by a wet spinning method, wherein an electric field of 3-18KV/cm is additionally applied during spinning;
s3, after the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are prepared according to the method, the modified polypropylene crude fiber and the modified polyacrylonitrile fiber are put into concrete and fully stirred until the mixture is uniform, and the modified concrete is obtained.
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| CN112936504A (en) * | 2021-02-24 | 2021-06-11 | 上海城建预制构件有限公司 | Bridge member and manufacturing method |
| CN113149522A (en) * | 2021-01-27 | 2021-07-23 | 淮安盖特建材科技有限公司 | Preparation method of high-strength high-performance concrete |
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Application publication date: 20200828 |