CN116283106A - Ultra-high performance concrete doped with hybrid POMF/SF and preparation method thereof - Google Patents
Ultra-high performance concrete doped with hybrid POMF/SF and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 42
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 18
- 239000006004 Quartz sand Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229920012196 Polyoxymethylene Copolymer Polymers 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 14
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims 2
- 239000002253 acid Substances 0.000 claims 2
- 229920001223 polyethylene glycol Polymers 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- -1 polyoxymethylene Polymers 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 229930040373 Paraformaldehyde Natural products 0.000 abstract 1
- 229920006324 polyoxymethylene Polymers 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
-
- 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
- C04B14/48—Metal
-
- 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
- C04B16/0675—Macromolecular compounds fibrous from polymers 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses ultra-high performance concrete doped with hybrid POMF/SF and a preparation method thereof, and belongs to the technical field of building materials. The ultra-high performance concrete doped with the hybrid POMF/SF is prepared from the following raw materials: 809kg/m cement 3 1079kg/m quartz sand 3 270kg/m of silica fume 3 177kg/m of water 3 21.6kg/m water reducing agent 3 0-236 kg/m of Steel Fiber (SF) 3 0 to 43kg/m of polyoxymethylene copolymer fibers (POMF) 3 The components are mixed and stirred uniformly according to a certain sequence to form the hybrid fiber ultra-high performance concrete.The invention plays a role in reinforcing on multiple scales by playing the mixing effect of the steel fiber and the polyoxymethylene fiber, reasonably regulates and controls the mixing amount proportion of the two fibers, improves the fluidity of the material compared with single-doped fiber ultra-high performance concrete with the same volume mixing amount, and improves the compressive strength and the elastic modulus of the concrete to a certain extent.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to ultra-high performance concrete doped with hybrid POMF/SF and a preparation method thereof.
Background
Concrete is a foundation of national construction and is a core material for construction, however, the concrete is influenced by the property of the material, and the defects of high brittleness, easiness in cracking, low early strength and the like commonly exist in the concrete at present, so that the safety of a structure is influenced. The fiber concrete is a cement-based mixed material prepared by taking concrete as a matrix and doping other fibers. The fiber is doped into the concrete to improve the performances of tensile strength, fracture resistance, impact resistance, wear resistance and the like, wherein the high-elasticity-modulus high-strength fiber can improve the strength of the concrete, and the low-elasticity-modulus low-strength fiber can reduce and inhibit the cracking of the concrete. Simultaneously, two kinds of fibers are doped, so that the fibers with different excellent characteristics can work cooperatively, and the effect of the fibers is exerted in different stress gas stages to enhance the mechanical properties of the concrete. At present, more researches are carried out on the single doping of a fiber, and more popular is the doping of Steel Fibers (SF), and the doping of SF can improve the toughness of concrete, but the SF is easy to agglomerate into blocks, so that the fluidity of the concrete is reduced, the fiber is unevenly distributed, the porosity is increased, the mechanical property of the concrete is reduced, and in addition, the requirement of improving various properties of the concrete cannot be met by the single fiber material at present.
In order to solve the above problems, mixed polyvinyl alcohol fibers (PVAF) are used, however, PVAF is expensive, has poor hydrolyzability, and is easily hydrolyzed in a wet environment to lose strength and toughness. There are also blends of polypropylene fibers (PPF) that have limited use due to relatively poor chemical and abrasion resistance. The copolymer formaldehyde fiber (POMF) has a strong-C-O-structure in the main chain, so that the stable chemical components and excellent mechanical properties are maintained, and the POMF can form a strong interface with cement. However, the influence of the mixed mixing of POMF and SF on the mechanical properties of concrete has not been studied, and the preferable mixing ratio of POMF and SF has not been studied. Therefore, it is necessary to comprehensively consider various conditions such as mechanical properties, fluidity and the like, and further develop ultra-high performance concrete related to hybrid POMF/SF and a preparation method thereof.
Disclosure of Invention
The invention aims to provide ultra-high performance concrete doped with hybrid POMF/SF and a preparation method thereof, and aims to solve the problems of low tensile strength, poor toughness, easiness in cracking and low early strength of the concrete in the prior art.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention provides ultra-high performance concrete doped with hybrid POMF/SF, which is prepared from the following raw materials in unit volume by mass:
809kg/m cement 3 The method comprises the steps of carrying out a first treatment on the surface of the 1079kg/m quartz sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 270kg/m of silica fume 3 The method comprises the steps of carrying out a first treatment on the surface of the 177kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the 21.6kg/m water reducing agent 3 The method comprises the steps of carrying out a first treatment on the surface of the Steel Fiber (SF) 0-236 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 0 to 43kg/m of polyoxymethylene copolymer fibers (POMF) 3 。
Preferably, in the ultra-high performance concrete mixed with the hybrid POMF/SF, the Steel Fiber (SF) has a length of 13mm, a diameter of 0.2mm, a density of 7.85g/cm3, a tensile strength of 2600MPa, an elastic modulus of 200GPa, a copolyformaldehyde fiber (POMF) has a length of 12mm, a diameter of 0.1mm, a density of 1.41g/cm3, a tensile strength of 686MPa, and an elastic modulus of 7.5GPa.
Preferably, in an ultra-high performance concrete incorporating hybrid POMF/SF as described above, the silica sand particle size is about half of each of 20-40 and 70-140 mesh.
Preferably, in an ultra-high performance concrete incorporating hybrid POMF/SF as described above, the cement is a PIL525R ordinary silicate.
Preferably, in the ultra-high performance concrete mixed with the hybrid POMF/SF, the water reducing agent is a polycarboxylate ether type high efficiency water reducing agent.
Preferably, in the ultra-high performance concrete mixed with the hybrid POMF/SF, the silica fume is silicon dioxide (SiO 2) powder with the particle size of 50-100 mu m, and capillary holes in cement mortar can be filled with the silica fume, so that the permeability of the concrete and corrosion problems caused by the permeability are reduced, and the chemical resistance of the concrete is improved.
Compared with the prior art, the invention has at least the following beneficial effects:
the mixed POMF/BF is doped in the concrete formula, so that the appearance of new cracks can be effectively delayed, the expansion of the original defects can be prevented, and the cracking resistance and the durability of the concrete are improved. Even if the concrete cracks, the fiber can bear tensile stress across the crack, so that the concrete has certain ductility. Meanwhile, the compactness of the cement matrix can be improved by doping the fiber, and the invasion of external moisture is prevented.
The concrete prepared by the method has great improvement on mechanical properties, and is mainly characterized by the reverse surfaces such as tensile strength, flexural strength, toughness and the like. The elastic modulus and the tensile strength of the hybrid POMF/BF are large, and the fibers and the concrete bear the tensile force together through the cohesive force and the mechanical biting force, so that the bearing capacity of the concrete is improved.
Another object of the present invention is to provide a method for preparing ultra-high performance concrete doped with hybrid POMF/SF, comprising the steps of:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) And (3) shaping and curing the concrete slurry to obtain the ultra-high performance concrete doped with the hybrid POMF/SF.
Preferably, in the step (3), before the hybrid POMF/SF is put into the concrete mixer, the fibers are firstly put into bags, and the concrete is subjected to blowing-off treatment by using a high-pressure air gun, so that the agglomeration phenomenon of the fibers is reduced, the fibers are more easily mixed in the concrete mixer, and the fibers are more uniformly distributed in the concrete.
The invention has simple production process and easy implementation, and can be directly put into practical engineering for application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail by specific embodiments, but the embodiments of the present invention are not limited thereto.
The compressive strength and elastic modulus of the concrete obtained below were tested according to the standard of the ordinary concrete mechanical property test method GB/50081-2002, and fluidity was evaluated by using a table jump test according to GB/T2419.
Example 1:
this example provides a hybrid POMF/SF ultra-high performance concrete, raw material ratio (1 m 3 The material amounts of the concrete) are shown in table 1:
table 1: mixing proportion design (kg/m) of hybrid POMF/SF ultra-high performance concrete 3 )
| Cement and its preparation method | Quartz sand | Silica fume | Water and its preparation method | Water reducing agent | SF | POMF |
| 809 | 1079 | 270 | 177 | 21.6 | 0 | 0 |
The preparation method comprises the following steps:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) Pouring concrete slurry into a mould (150 mm multiplied by 150mm cubic mould, pouring 12 moulds in total), using a vibrating table and manual insertion to compact, trowelling, covering a plastic film, and curing for 28 days to obtain the ultra-high performance concrete doped with hybrid POMF/SF.
Example 2:
this example provides a hybrid POMF/SF ultra-high performance concrete, raw material ratio (1 m 3 The material amounts of the concrete) are shown in table 2:
table 2: mixing proportion design (kg/m) of hybrid POMF/SF ultra-high performance concrete 3 )
| Cement and its preparation method | Quartz sand | Silica fume | Water and its preparation method | Water reducing agent | SF | POMF |
| 809 | 1079 | 270 | 177 | 21.6 | 235.5 | 0 |
The preparation method comprises the following steps:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) Pouring concrete slurry into a mould (150 mm multiplied by 150mm cubic mould, pouring 12 moulds in total), using a vibrating table and manual insertion to compact, trowelling, covering a plastic film, and curing for 28 days to obtain the ultra-high performance concrete doped with hybrid POMF/SF.
Example 3:
this example provides a hybrid POMF/SF ultra-high performance concrete, raw material ratio (1 m 3 The material amounts of the concrete) are shown in table 3:
table 3: mixing proportion design (kg/m) of hybrid POMF/SF ultra-high performance concrete 3 )
| Cement and its preparation method | Quartz sand | Silica fume | Water and its preparation method | Water reducing agent | SF | POMF |
| 809 | 1079 | 270 | 177 | 21.6 | 157 | 14.1 |
The preparation method comprises the following steps:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) Pouring concrete slurry into a mould (150 mm multiplied by 150mm cubic mould, pouring 12 moulds in total), using a vibrating table and manual insertion to compact, trowelling, covering a plastic film, and curing for 28 days to obtain the ultra-high performance concrete doped with hybrid POMF/SF.
Example 4:
this example provides a hybrid POMF/SF ultra-high performance concrete, raw material ratio (1 m 3 The material amounts of the concrete) are shown in table 4:
table 4: mixing proportion design (kg/m) of hybrid POMF/SF ultra-high performance concrete 3 )
| Cement and its preparation method | Quartz sand | Silica fume | Water and its preparation method | Water reducing agent | SF | POMF |
| 809 | 1079 | 270 | 177 | 21.6 | 78.5 | 28.2 |
The preparation method comprises the following steps:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) Pouring concrete slurry into a mould (150 mm multiplied by 150mm cubic mould, pouring 12 moulds in total), using a vibrating table and manual insertion to compact, trowelling, covering a plastic film, and curing for 28 days to obtain the ultra-high performance concrete doped with hybrid POMF/SF.
Example 5:
this example provides a hybrid POMF/SF ultra-high performance concrete, raw material ratio (1 m 3 The material amounts of the concrete) are shown in table 5:
table 5: mixing proportion design (kg/m) of hybrid POMF/SF ultra-high performance concrete 3 )
| Cement and its preparation method | Quartz sand | Silica fume | Water and its preparation method | Water reducing agent | SF | POMF |
| 809 | 1079 | 270 | 177 | 21.6 | 0 | 42.3 |
The preparation method comprises the following steps:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding two fibers and stirring for 6min to obtain concrete slurry;
(4) Pouring concrete slurry into a mould (150 mm multiplied by 150mm cubic mould, pouring 12 moulds in total), using a vibrating table and manual insertion to compact, trowelling, covering a plastic film, and curing for 28 days to obtain the ultra-high performance concrete doped with hybrid POMF/SF.
The concrete test pieces obtained in examples 1 to 5 were subjected to 28-day axial compressive strength and dynamic compressive strength, respectively, and the test results are shown in Table 5
Table 5: mechanical Properties of concrete test pieces of examples 1 to 5
Note that: the SF/POMF mixing ratio is the volumetric mixing ratio of SF to POMF.
From the above table, it can be seen that the compressive strength and elastic modulus of examples 2 to 5 are all superior to those of example 1, and that example 2 is the most preferred example. It can also be seen that the flowability of examples 2 to 5, in which the fibers were incorporated, was slightly lower than that of example 1, in which the fibers were not incorporated, and that of examples 3 and 4, in which the hybrid POMF/SF was incorporated, were higher than that of examples 2 and 5, in which the individual fibers were incorporated. Meanwhile, the flowability, compressive strength and elastic modulus can be correspondingly adjusted within a certain range by adjusting the mixing proportion of the two fibers.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. An ultra-high performance concrete doped with hybrid POMF/SF and a preparation method thereof are characterized in that the ultra-high performance concrete is prepared from the following raw materials in unit volume by mass: 809kg/m cement 3 The method comprises the steps of carrying out a first treatment on the surface of the 1079kg/m quartz sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 270kg/m of silica fume 3 The method comprises the steps of carrying out a first treatment on the surface of the 177kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the 21.6kg/m water reducing agent 3 The method comprises the steps of carrying out a first treatment on the surface of the Steel Fiber (SF) 0-236 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 0 to 43kg/m of polyoxymethylene copolymer fibers (POMF) 3 。
2. The ultra-high performance concrete incorporating hybrid POMF/SF according to claim 1, wherein said cement is PIL525R ordinary silicate.
3. An ultra-high performance concrete incorporating hybrid POMF/SF according to claim 1 wherein the silica sand particle size comprises 20-40 mesh and 70-140 mesh, each half.
4. The ultra-high performance concrete doped with hybrid POMF/SF according to claim 1, wherein the water reducer is a polycarboxylate ether type high efficiency water reducer, mainly comprising polycarboxylic acid and polyethylene glycol, and the mass ratio of the polycarboxylic acid to the polyethylene glycol is 1:1.5.
5. The ultra-high performance concrete incorporating hybrid POMF/SF according to claim 1, wherein the silica fume is a silica (SiO 2) powder having a particle size of 50-100 μm.
6. A hybrid-incorporated POMF/SF as claimed in claim 1The ultra-high performance concrete is characterized in that the SF length is 13mm, the diameter is 0.2mm, and the density is 7.85g/cm 3 The tensile strength was 2600MPa, and the elastic modulus was 200GPa.
7. The ultra-high performance concrete incorporating hybrid POMF/SF according to claim 1, wherein said POMF has a length of 12mm, a diameter of 0.1mm, and a density of 1.41g/cm 3 The tensile strength was 686MPa, and the elastic modulus was 7.5GPa.
8. The ultra-high performance concrete incorporating hybrid POMF/SF and method of preparing the same as claimed in any one of claims 1 to 7, characterized by comprising the steps of:
(1) Putting the weighed cement, silica fume and quartz sand into a concrete mixer, and mixing for 3min to obtain a concrete powder premix;
(2) Firstly adding 2/3 of water and a water reducing agent, stirring for 6min, and then adding the rest of water and the water reducing agent, stirring for 3min to obtain a flowing matrix;
(3) Simultaneously adding the two fibers and stirring for 6min to obtain the concrete slurry.
(4) And (3) shaping and curing the concrete slurry to obtain the ultra-high performance concrete doped with the hybrid POMF/SF.
9. The method according to claim 8, wherein in the step (3), before the mixed POMF/SF is put into the concrete mixer, the fibers are packed in bags, and the concrete is subjected to a blowing treatment by a high-pressure air gun.
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| CN117886528A (en) * | 2024-03-18 | 2024-04-16 | 中国电建集团西北勘测设计研究院有限公司 | Aggregate alkali-inhibiting active material and preparation method thereof |
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2023
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117886528A (en) * | 2024-03-18 | 2024-04-16 | 中国电建集团西北勘测设计研究院有限公司 | Aggregate alkali-inhibiting active material and preparation method thereof |
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