CN111056790A - High-performance concrete doped with micro-nano-grade fibers and preparation method thereof - Google Patents
High-performance concrete doped with micro-nano-grade fibers and preparation method thereof Download PDFInfo
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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
- 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
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a high-performance concrete doped with micro-nano-scale fibers and a preparation method thereof, belongs to the technical field of concrete, and realizes the synergistic effect of macro-scale fibers and micro-nano-scale fibers at different stages of concrete damage, thereby improving the mechanical property and durability of the concrete. The concrete is doped with polyvinyl alcohol fibers and carbon nanofibers, so that the compressive strength, the rupture strength and the crack resistance are remarkably improved, and the concrete can be applied to structures with requirements on the strength and the crack resistance. The preparation method comprises the steps of weighing cement, fly ash, coarse aggregate and fine aggregate according to the weight, putting the weighed materials into a mixture, uniformly mixing, adding polyvinyl alcohol fiber into the mixture for multiple times, mixing the carbon nanofibers, the water reducing agent and a proper amount of water, and performing ultrasonic dispersion to prepare carbon nanotube slurry; and finally, putting the residual water, the water reducing agent and the carbon nanofiber slurry into the mixture, and uniformly stirring to obtain the hybrid polyvinyl alcohol-carbon nanofiber concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a high-performance concrete mixed with polyvinyl alcohol-carbon nanofiber and a preparation method thereof.
Background
As a novel high-technology concrete, the high-performance concrete has the characteristics of high durability, high strength and high workability, and is generally considered as an important development direction of concrete materials by the engineering industry. But the characteristics of high gel material dosage and low water-gel ratio bring the characteristics of high brittleness and easier cracking while having a plurality of excellent properties. In order to improve the characteristic, domestic and foreign scholars generally adopt a mode of adding fibers into concrete to improve the toughness of the concrete.
Research shows that a large number of micro cracks are distributed in the concrete, and the damage process of the concrete is the process that the cracks are generated and continuously spread until the cracks are unstable. The fiber is added, so that the plastic deformation of the concrete is restrained, the stress in the concrete is shared, and the generation and the development of micro cracks are delayed or hindered. Meanwhile, the action mechanisms of the fibers with different sizes and different elastic moduli in the process of inhibiting the damage of the concrete are different. Therefore, it is one of the important research directions of fiber concrete to mix various fibers in concrete to exert their synergistic effect and further improve the concrete performance.
The polyvinyl alcohol fiber (PVA fiber) is used as a novel synthetic fiber processed by advanced technology, has the characteristics of high strength, high elastic modulus, wear resistance, corrosion resistance and the like, and has good cohesiveness with a concrete matrix material, thereby effectively improving the toughness of concrete.
The nano carbon fibers (CNFs) inhibit the development of cracks in a manner of transferring the load between cracks and cavities, and realize the specific improvement of the macro and micro structures of concrete. The carbon nanofiber is a novel carbon material, is an expression of another form of chemical vapor grown carbon fiber, is obtained by cracking and decomposing a vapor hydrocarbon, belongs to non-continuous graphite fiber, and has a diameter of 50-200 nm and a length-diameter ratio of 100-1000. Compared with common carbon fiber, the carbon fiber has common characteristics and also has other special advantages, such as large length-diameter ratio, large specific surface area, compact structure and the like. Meanwhile, the nano-material has the characteristics of small-size effect, surface effect, quantum size effect and the like when being used as a nano-material. When the additive is mixed into concrete, the activity of the concrete can be improved, the durability of the concrete can be improved, and the functional requirements of the concrete can be enhanced.
Disclosure of Invention
The invention aims to provide a composite micro-nano fiber high-performance concrete and a preparation method thereof, belongs to the technical field of concrete, and realizes the synergistic effect of macro fibers and micro nano fibers at different stages of concrete destruction, thereby improving the mechanical property and durability of the concrete and providing a basis for practical engineering application.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high performance concrete with composite doped micron-nanometer level fiber features that nanometer carbon fiber in 0.05-0.3 wt% of concrete gel material and polyvinyl alcohol fiber in 0.05-0.3 vol% of concrete are mixed into the high performance concrete matrix, and the concrete matrix consists of the following components in parts by weight: 1 part of water, 2.24 parts of cement, 7.09 parts of broken stone, 3.82 parts of sand, 0.39 part of fly ash and 0.03 part of water reducing agent.
According to the composite micro-nano fiber doped high-performance concrete, the particle size of the crushed stone is 5-20 mm in continuous gradation; the sand is river sand and natural medium sand with fineness modulus of 2.64; the cement is ordinary portland cement with the strength grade of P.O 42.5; the fly ash is I-grade fly ash; the water reducing agent is a polycarboxylic acid water reducing agent.
The carbon nanofiber high-performance concrete doped with the micro-nano fibers has the diameter of 150nm and the length of 5-10 mu m.
In the above high-performance concrete doped with micro-nano-scale fibers, the polyvinyl alcohol fibers have a diameter of 31 μm and a length of 12 mm.
In the designed mixing amount range, the optimum mixing ratio of the composite micro-nano fiber high-performance concrete for improving the compressive strength of the concrete is as follows: the mass ratio of the water to the cementing material is 0.35, the volume mixing amount of the fly ash is 20%, the volume mixing amount of the polyvinyl alcohol fiber is 0.1%, and the mass fraction of the carbon nanofibers is 0.1%.
In the designed mixing amount range, the optimum mixing proportion for improving the flexural strength of the concrete is as follows: 0.35 percent of water-gel ratio, 25 percent of volume doping amount of fly ash, 0.3 percent of volume doping amount of polyvinyl alcohol fiber and 0.3 percent of mass fraction of nano carbon fiber.
In the designed mixing amount range, the optimum mixing proportion for improving the fracture toughness of the concrete is as follows: 0.35 percent of water-gel ratio, 25 percent of volume doping amount of fly ash, 0.3 percent of volume doping amount of polyvinyl alcohol fiber and 0.3 percent of mass fraction of nano carbon fiber.
The preparation method of the composite micro-nano fiber high-performance concrete comprises the following steps:
firstly, stirring the weighed cementing material and fine aggregate in a forced stirrer for 1 min;
secondly, adding the coarse aggregate and the water reducing agent and stirring for 1 min;
thirdly, after the aggregate and the cementing material are uniformly stirred, 1/3 water is added to stir the mixture until the mixture is wet, and then the PVA fiber is added into the stirrer for multiple times to be stirred until the fiber is not agglomerated;
weighing water and a polycarboxylic acid high-performance water reducing agent according to the weight, mixing the carbon nanofibers, the water reducing agent and the water according to the mass ratio of 1:2:50, and performing ultrasonic dispersion for 6min to obtain a carbon nanofiber mixed solution;
and fifthly, adding the residual water, the polycarboxylic acid high-performance water reducing agent and the nano carbon fiber mixed solution prepared in the fourth step into the dry material prepared in the third step, and uniformly stirring to obtain the hybrid polyvinyl alcohol-nano carbon fiber high-performance concrete.
The invention has the following beneficial effects:
firstly, the working performance of concrete is improved by replacing cement with fly ash in an equivalent manner; the dispersion of the carbon nanofibers is facilitated while the strength of the concrete is improved.
Secondly, a method for dispersing the carbon nanofibers is explicitly provided, so that the carbon nanofibers can be uniformly dispersed in the concrete matrix.
Thirdly, the hybrid fiber has the modification effects of improving the internal integrity of the material and inhibiting the generation and development of micro cracks on the concrete, so that the compression resistance, the rupture strength and the crack resistance of the concrete are obviously improved.
Drawings
FIG. 1 is a photograph showing the shape of a test piece after a concrete axial compression failure test of a control group;
FIG. 2 is a photograph showing the shape of a test piece after the concrete axial compression failure test prepared by the method of the present invention;
FIG. 3 is a photograph showing the shape of a test piece after a concrete fracture resistance test of a control group;
FIG. 4 is a photograph showing the shape of a test piece after the concrete fracture resistance test prepared by the method of the present invention;
FIG. 5 is a photograph showing the shape of a test piece after a concrete fatigue loading experiment in a control group;
FIG. 6 is a photograph showing the morphology of a test piece after the fatigue loading test of the concrete prepared by the method of the present invention.
Detailed Description
The first embodiment is as follows:
the high performance concrete with composite doped micron-nanometer level fiber features that nanometer carbon fiber in 0.05-0.3 wt% of concrete gel material and polyvinyl alcohol fiber in 0.05-0.3 vol% of concrete are mixed into the high performance concrete matrix, and the concrete matrix consists of the following components in parts by weight: 1 part of water, 2.24 parts of cement, 7.09 parts of broken stone, 3.82 parts of sand, 0.39 part of fly ash and 0.03 part of water reducing agent.
According to the composite micro-nano fiber doped high-performance concrete, the particle size of the crushed stone is 5-20 mm in continuous gradation; the sand is river sand and natural medium sand with fineness modulus of 2.64; the cement is ordinary portland cement with the strength grade of P.O 42.5; the fly ash is I-grade fly ash; the water reducing agent is a polycarboxylic acid water reducing agent.
The carbon nanofiber high-performance concrete doped with the micro-nano fibers has the diameter of 150nm and the length of 5-10 mu m.
In the above high-performance concrete doped with micro-nano-scale fibers, the polyvinyl alcohol fibers have a diameter of 31 μm and a length of 12 mm.
The preparation method of the composite micro-nano fiber high-performance concrete comprises the following steps:
firstly, stirring the weighed cementing material and fine aggregate in a forced stirrer for 1 min; the cementing material is cement; the fine aggregate is river sand;
secondly, adding the coarse aggregate and the water reducing agent and stirring for 1 min; the coarse aggregate is broken stone; the water reducing agent is a polycarboxylic acid high-performance water reducing agent;
thirdly, after the aggregate and the cementing material are uniformly stirred, 1/3 water is added to stir the mixture until the mixture is wet, and then the PVA fiber is added into the stirrer for multiple times to be stirred until the fiber is not agglomerated;
weighing water and a polycarboxylic acid high-performance water reducing agent according to the weight, mixing the carbon nanofibers, the water reducing agent and the water according to the mass ratio of 1:2:50, and performing ultrasonic dispersion for 6min to obtain a carbon nanofiber mixed solution;
and fifthly, adding the residual water, the polycarboxylic acid high-performance water reducing agent and the nano carbon fiber mixed solution prepared in the fourth step into the dry material prepared in the third step, and uniformly stirring to obtain the hybrid polyvinyl alcohol-nano carbon fiber high-performance concrete.
Example 1:
cube compressive strength test: this example produced 10 test pieces in total, of which 1 group had no added fiber as a control and 9 groups had hybrid fiber incorporated by orthogonal experimental design as test groups. The weight percentage of the matrix concrete is as follows: 1 part of water, 2.24 parts of cement, 7.09 parts of broken stone, 3.82 parts of sand, 0.39 part of fly ash and 0.03 part of water reducing agent.
The cube compression strength test adopts a cube of 100mm multiplied by 100mm, each group is made into 3 test pieces, and the test grouping and the test result are as follows:
as can be seen from the test data in the table, the invention can fully play the gain role of the hybrid fiber through proper proportion of the polyvinyl alcohol fiber and the nano carbon fiber, thereby improving the compressive strength of the concrete, wherein the strength improvement range is the group A at most1B2C2D2And 19.6% higher than the control group.
Example 2:
breaking strength: this example produced 10 test pieces in total, of which 1 group had no added fiber as a control and 9 groups had hybrid fiber incorporated by orthogonal experimental design as test groups.
The base concrete mixing ratio was the same as in example 1.
The flexural strength test adopts cuboids with the side length of 100mm multiplied by 400mm, each group is provided with 3 test pieces, and the test grouping and the test result are as follows:
as can be seen from the test data in the table, the invention can fully play the gain role of the hybrid fiber through proper proportion of the polyvinyl alcohol fiber and the nano carbon fiber, thereby improving the flexural strength of the concrete, wherein the strength improvement range is the group A at most1B3C3D3And is 23.9% higher than the control group.
Example 3:
fracture toughness: this example produced 10 test pieces in total, of which 1 group had no added fiber as a control and 9 groups had hybrid fiber incorporated by orthogonal experimental design as test groups.
The base concrete mixing ratio was the same as in example 1.
The fracture toughness test adopts 100mm multiplied by 515mm size test pieces, each group is made into 3 test pieces, the test groups are divided and the test results are as follows:
as can be seen from the test data in the table, the invention can fully play the gain role of the hybrid fiber through proper proportion of the polyvinyl alcohol fiber and the nano carbon fiber, thereby improving the fracture toughness of the concrete, wherein the strength improvement range is the group A at most1B3C3D3249% higher than the control group.
FIG. 1 and FIG. 2 are group A1B1C1D1And group A1B2C2D2And (5) testing the shape of the test piece after the cube is damaged by pressure.
FIG. 3 and FIG. 4 are group A1B1C1D1And group A1B2C2D2And the shape of the test piece after the fracture test is damaged.
FIG. 5 and FIG. 6 are group A1B1C1D1And group A1B2C2D2The fracture toughness test shows the shape of the test piece after being damaged.
Claims (9)
1. The high performance concrete with composite doped micron-nanometer level fiber features that nanometer carbon fiber in 0.05-0.3 wt% of concrete cementing material and polyvinyl alcohol fiber in 0.05-0.3 vol% of concrete are doped into the high performance concrete matrix.
2. The high-performance concrete with the micro-nano-scale fiber mixed therein as claimed in claim 1, wherein the weight component of the high-performance concrete matrix is as follows: 1 part of water, 2.24 parts of cement, 7.09 parts of broken stone, 3.82 parts of sand, 0.39 part of fly ash and 0.03 part of water reducing agent.
3. The micro-nano fiber blended high performance concrete according to claim 1 or 2, characterized in that the crushed stone has a continuous gradation of 5-20 mm in particle size; the river sand is natural medium sand with fineness modulus of 2.64; the cement is ordinary portland cement with the strength grade of P.O 42.5; the fly ash is I-grade fly ash; the water reducing agent is a polycarboxylic acid water reducing agent.
4. The highly functional concrete of claim 1 or 2, wherein the carbon nanofibers have a diameter of 150nm and a length of 5-10 μm.
5. The highly functional concrete according to claim 1 or 2, wherein the polyvinyl alcohol fibers have a diameter of 31 μm and a length of 12 mm.
6. The high-performance concrete of the compound micro-nano fiber according to claim 1 or 2, wherein the concrete comprises the following components in percentage by weight: 0.35 percent of water-gel ratio, 20 percent of volume doping amount of fly ash, 0.1 percent of volume doping amount of polyvinyl alcohol fiber and 0.1 percent of mass fraction of nano carbon fiber.
7. The high-performance concrete of the compound micro-nano fiber according to claim 1 or 2, wherein the concrete comprises the following components in percentage by weight: 0.35 percent of water-gel ratio, 25 percent of volume doping amount of fly ash, 0.3 percent of volume doping amount of polyvinyl alcohol fiber and 0.3 percent of mass fraction of nano carbon fiber.
8. The high-performance concrete of the compound micro-nano fiber according to claim 1 or 2, wherein the concrete comprises the following components in percentage by weight: 0.35 percent of water-gel ratio, 25 percent of volume doping amount of fly ash, 0.3 percent of volume doping amount of polyvinyl alcohol fiber and 0.3 percent of mass fraction of nano carbon fiber.
9. A method for preparing a high performance concrete doped with micro-nano fibers according to any one of claims 1 to 5, which comprises the following steps:
firstly, stirring the weighed cementing material and fine aggregate in a forced stirrer for 1 min;
secondly, adding the coarse aggregate and the water reducing agent and stirring for 1 min;
thirdly, after the aggregate and the cementing material are uniformly stirred, 1/3 water is added to stir the mixture until the mixture is wet, and then the PVA fiber is added into the stirrer for multiple times to be stirred until the fiber is not agglomerated;
weighing water and a polycarboxylic acid high-performance water reducing agent according to the weight, mixing the carbon nanofibers, the water reducing agent and the water in a mass ratio of 1:2:50, and performing ultrasonic dispersion for 6min to obtain a carbon nanofiber mixed solution;
and fifthly, adding the residual water, the polycarboxylic acid high-performance water reducing agent and the nano carbon fiber mixed solution prepared in the fourth step into the dry material prepared in the third step, and uniformly stirring to obtain the hybrid polyvinyl alcohol-nano carbon fiber high-performance concrete.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112110697A (en) * | 2020-09-08 | 2020-12-22 | 中国人民解放军空军工程大学 | Method for improving dynamic property of concrete by applying multi-scale fiber structure |
| CN113060989A (en) * | 2021-03-25 | 2021-07-02 | 中国人民解放军空军工程大学 | Method for enhancing concrete resistance and electromagnetic shielding performance by using carbon nanofibers |
| CN113816695A (en) * | 2021-10-26 | 2021-12-21 | 西安建筑科技大学 | Carbon nanotube modified concrete and preparation method and application thereof |
| CN113880525A (en) * | 2021-10-28 | 2022-01-04 | 深圳市福盈混凝土有限公司 | Carbon nanotube concrete and preparation method thereof |
| CN113929391A (en) * | 2021-10-26 | 2022-01-14 | 西安建筑科技大学 | Carbon fiber reinforced concrete and preparation method and application thereof |
| CN114349444A (en) * | 2022-01-25 | 2022-04-15 | 大连海事大学 | Sensing type crack induction material and preparation method and application thereof |
| CN115010415A (en) * | 2022-06-10 | 2022-09-06 | 三亚瑞泽双林混凝土有限公司 | High-performance concrete and preparation method thereof |
| CN115477507A (en) * | 2022-09-15 | 2022-12-16 | 杭州三中新型建材科技有限公司 | Anti-cracking special fiber concrete and preparation method thereof |
| CN115572098A (en) * | 2022-10-27 | 2023-01-06 | 光明铁道控股有限公司 | Concrete additive and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
| CN115849806A (en) * | 2022-11-25 | 2023-03-28 | 河北宏京新型建材有限公司 | UHPC decorative concrete and preparation method thereof |
| CN116023059A (en) * | 2022-12-12 | 2023-04-28 | 辰龙新材料科技发展(山东)有限公司 | Multistage hybrid fiber, cement-based repair material, preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112110697A (en) * | 2020-09-08 | 2020-12-22 | 中国人民解放军空军工程大学 | Method for improving dynamic property of concrete by applying multi-scale fiber structure |
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| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
| CN115477507A (en) * | 2022-09-15 | 2022-12-16 | 杭州三中新型建材科技有限公司 | Anti-cracking special fiber concrete and preparation method thereof |
| CN115572098A (en) * | 2022-10-27 | 2023-01-06 | 光明铁道控股有限公司 | Concrete additive and preparation method thereof |
| CN115572098B (en) * | 2022-10-27 | 2024-05-28 | 光明铁道控股有限公司 | Concrete additive and preparation method thereof |
| CN115849806A (en) * | 2022-11-25 | 2023-03-28 | 河北宏京新型建材有限公司 | UHPC decorative concrete and preparation method thereof |
| CN115849806B (en) * | 2022-11-25 | 2024-04-09 | 河北宏京新型建材有限公司 | Decorative concrete and preparation method thereof |
| CN116023059A (en) * | 2022-12-12 | 2023-04-28 | 辰龙新材料科技发展(山东)有限公司 | Multistage hybrid fiber, cement-based repair material, preparation method and application thereof |
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