CN111792890A - Full-scale fiber toughened ultrahigh-performance concrete and preparation method thereof - Google Patents
Full-scale fiber toughened ultrahigh-performance concrete and preparation method thereof Download PDFInfo
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- CN111792890A CN111792890A CN202010456161.7A CN202010456161A CN111792890A CN 111792890 A CN111792890 A CN 111792890A CN 202010456161 A CN202010456161 A CN 202010456161A CN 111792890 A CN111792890 A CN 111792890A
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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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- 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
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
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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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses full-scale fiber toughened ultrahigh-performance concrete and a preparation method thereof, wherein fibers used in the ultrahigh-performance concrete are divided into millimeter-scale, micron-scale and nanometer-scale fibers in a full-scale range to toughen the ultrahigh-performance concrete; the stress characteristics of the ultra-high performance concrete are matched with three fibers with different scales, so that the mechanical property requirements of different requirements are met, and the ultra-high performance concrete comprises the following components in parts by weight: 90-250 parts of full-scale fibers, 600-900 parts of cement, 100-300 parts of mineral powder, 100-200 parts of silica fume, 900-1200 parts of fine aggregate, 8-15 parts of an additive and 160-190 parts of water. The invention carries out toughening on the ultra-high performance concrete from three layers of millimeter, micron and nanometer by a full-scale fiber mode, thereby realizing the effect of restraining and controlling cracks with different scales of the ultra-high performance concrete under the stress condition.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to full-scale fiber toughened ultrahigh-performance concrete and a preparation method thereof.
Background
Ultra-high performance concrete is a novel cement-based material characterized by ultra-high strength, ultra-high toughness and ultra-high durability. The design, preparation, microstructure, performance and construction of ultra-high performance concrete materials and structures have become the most advanced and leading research direction in the field of building engineering. These advantages of ultra-high performance concrete leave a very large development space and a very large application advantage in infrastructure construction in the fields of traffic roads and bridges, energy engineering and the like.
The design theory of the ultra-high performance concrete mainly depends on the closest packing theory (DSP), the closest packing material consists of 70-80% of cement, 20-30% of superfine material with the average particle size being 1-2 orders of magnitude smaller than that of the cement, a high-efficiency water reducing agent and water, the principle of the particle is applied, the material reaches the closest packing state through reasonable particle packing according to a close packing theoretical model, and the particles are combined through chemical reaction to obtain the uniform and dense high-density material. The maximum stacking density theory is to optimize the particle size distribution of the full-range particles from micro to macro, improve the compactness or reduce the void ratio, so the method is suitable for optimizing the particle size distribution of all solid particles (from aggregates to silica fume) of various concretes. In addition, steel fibers are added, so that the toughness of the ultra-high performance concrete can be remarkably improved on the premise of closest packing.
At present, the toughness of the ultra-high performance concrete is improved mainly by adding steel fibers to improve the flexural strength and tensile strength of the ultra-high performance concrete, the doping amount of the steel fibers is generally 1.0 to 5.0 percent according to the volume, and a common mixer is difficult to form after the doping amount of the steel fibers exceeds 3.0 percent. And secondly, selecting steel fibers with different morphologies to improve the toughness of the ultrahigh-performance concrete, such as end hook steel fibers, corrugated steel fibers, indentation steel fibers and the like. The toughening of the steel fibres is only done from a macroscopic level and the control of micro-cracks is often insufficient, in particular micro-cracks induced internally during the initial failure stage. Therefore, the invention provides the full-scale fiber toughened ultra-high performance concrete, the fiber with different scales is selected to simultaneously improve the toughness of the ultra-high performance concrete from the three layers of millimeter, micron and nanometer, the shrinkage of the ultra-high performance concrete is further reduced, and the application of the ultra-high performance concrete in an ultra-long span structure is greatly expanded.
Disclosure of Invention
The invention aims to provide full-scale fiber toughened ultrahigh-performance concrete with improved strength and volume stability and a preparation method thereof.
The technical scheme provided by the invention for solving the technical problems is as follows: the full-scale fiber toughened ultrahigh-performance concrete comprises the following components in parts by weight: 90-250 parts of full-scale fibers, 600-900 parts of cement, 100-300 parts of mineral powder, 100-200 parts of silica fume, 900-1200 parts of fine aggregate, 8-15 parts of an additive and 160-190 parts of water, wherein the full-scale fibers comprise millimeter-scale fibers, micron-scale fibers and nano-scale fibers, the millimeter-scale fibers are steel fibers, the micron-scale fibers are basalt fibers, and the nano-scale fibers are one of calcium carbonate whiskers, carbon nanotubes and a plurality of nano-scale fiber composites.
In the invention, cement, mineral powder and silica fume form a cementing material system of the ultra-high performance concrete, the proportion of each cementing material component is designed according to the closest packing theory, and the proportion of each cementing material component is determined by adopting a minimum water consumption test method, thereby achieving the closest packing state.
The further technical scheme is that the weight ratio of the millimeter-scale fibers to the micrometer-scale fibers to the nanometer-scale fibers is 80-200: 5-20: 5 to 30.
The further technical scheme is that the diameter of the millimeter-scale fibers is larger than or equal to 100 micrometers, the diameter of the micrometer-scale fibers is 10-100 micrometers, and the diameter of the nanometer-scale fibers is smaller than 10 micrometers.
The further technical proposal is that the cement is 52.5R-grade ordinary portland cement or 42.5R-grade ordinary portland cement.
The further technical scheme is that the ore powder is S95-grade ore powder, and the specific surface area of the ore powder is more than or equal to 350m2/kg。
The further technical proposal is that the specific surface area of the silica fume is more than or equal to 15000m2/kg，SiO2The content is more than or equal to 85 percent.
The further technical scheme is that the fine aggregate is machine-made sand or natural river sand, and the particle size is 0.15-4.75 mm.
The concrete admixture has the further technical scheme that the admixture is a polycarboxylic acid high-efficiency water reducing agent, the water reducing rate is more than or equal to 30%, the solid content is more than or equal to 40%, the admixture has high water reducing, defoaming and shrinkage reducing functions, the working performance of the ultrahigh-performance concrete can still achieve the self-compacting effect under the water-cement ratio of 0.13, the gas content can be controlled below 3.0%, and the admixture has a certain shrinkage reducing function and can compensate the self shrinkage of the ultrahigh-performance concrete.
A preparation method of full-scale fiber toughened ultrahigh-performance concrete comprises the following steps:
(1) preparing materials: weighing 90-250 parts of full-scale fibers, 600-900 parts of cement, 100-300 parts of mineral powder, 100-200 parts of silica fume, 900-1200 parts of fine aggregate, 8-15 parts of an additive and 160-190 parts of water;
(2) dry premixing: stirring and dispersing cement, mineral powder, silica fume and fine aggregate to prepare ultrahigh-performance concrete dry powder with good homogeneity;
(3) dispersing: uniformly dispersing the nano-scale fibers into the additive;
(4) wet mixing: pouring the ultra-high performance concrete dry powder into a common forced mixer, adding weighed water and an additive in which nano-scale fibers are dispersed, and uniformly mixing to obtain a slurry material;
(5) fiber dispersion: uniformly adding the weighed millimeter-scale fibers and micrometer-scale fibers into a slurry material, and uniformly stirring to obtain ultra-high performance concrete slurry;
(6) pouring and forming: placing the prepared ultra-high performance concrete slurry in a mould in a pouring mode, and removing the mould after the slurry is hardened to obtain a test piece;
(7) and (5) maintenance: and maintaining the test piece.
The further technical scheme is that the stirring mode in the step (2) is vibration stirring, and the dispersion mode in the step (3) is ultrasonic dispersion.
Compared with the prior art, the invention has the following beneficial effects: the invention carries out toughening on the ultra-high performance concrete from three layers of nanometer, micrometer and millimeter by a full-scale fiber mode, thereby realizing the effect of restraining and controlling cracks with different scales of the ultra-high performance concrete under the stress condition. In addition, the nano-scale and micron-scale fibers can also restrain the matrix of the ultra-high performance concrete in the hydration process of the ultra-high performance concrete, so that the self-shrinkage of the ultra-high performance concrete can be controlled to a certain extent, and the volume stability of the ultra-high performance concrete is kept.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The full-scale fiber toughened ultrahigh-performance concrete comprises the following components in parts by weight: 160 parts of steel fiber, 10 parts of basalt fiber, 20 parts of calcium carbonate whisker, 0.8 part of carbon nano tube, 690 parts of common 52.5R portland cement, 212 parts of mineral powder, 160 parts of silica fume, 1060 parts of river sand, 9 parts of additive and 170 parts of water.
And is prepared by the following steps:
(1) carrying out vibration stirring dispersion on cement, mineral powder, silica fume and river sand to prepare ultrahigh-performance concrete dry powder with good homogeneity;
(2) dispersing the carbon nano tube and the calcium carbonate crystal whisker into the additive in an ultrasonic dispersion mode;
(3) pouring the ultrahigh-performance concrete dry powder into a common forced mixer, adding weighed water and an additive in which carbon nanotubes are dispersed, and stirring for 3-5 minutes to obtain a slurry material;
(4) uniformly adding the weighed steel fibers and basalt fibers into the slurry material, stirring while adding, ensuring that the fibers are not agglomerated, and stirring for 2-4 minutes to prepare the ultra-high performance concrete slurry;
(5) pouring and forming, namely placing the prepared ultra-high performance concrete slurry in a mould in a pouring mode, and removing the mould after 24 hours to obtain a test piece;
(6) curing the test piece under the condition of a standard concrete curing system at the room temperature of 20 +/-2 ℃; the humidity is not less than 95%.
After stirring, forming a concrete compressive strength test piece of 100mm multiplied by 100mm, a concrete flexural strength test piece of 100mm multiplied by 400mm, forming an axial tensile strength test piece according to the standard T/CCPA 7-2018 'ultra-high performance concrete basic performance and test method', demoulding after the slurry is hardened, and curing in a standard curing room, wherein the performance test results are shown in table 1.
Example 2
The full-scale fiber toughened ultrahigh-performance concrete comprises the following components in parts by weight: 200 parts of steel fiber, 10 parts of calcium carbonate whisker, 1.0 part of carbon nano tube, 690 parts of common 52.5R portland cement, 212 parts of mineral powder, 160 parts of silica fume, 1060 parts of river sand, 9 parts of an additive and 180 parts of water.
After stirring, forming a concrete compressive strength test piece of 100mm multiplied by 100mm, a concrete flexural strength test piece of 100mm multiplied by 400mm, forming an axial tensile strength test piece according to the standard T/CCPA 7-2018 'ultra-high performance concrete basic performance and test method', demoulding after the slurry is hardened, and curing in a standard curing room, wherein the performance test results are shown in table 1.
Example 3
The full-scale fiber toughened ultrahigh-performance concrete comprises the following components in parts by weight: 120 parts of steel fiber, 20 parts of basalt fiber, 20 parts of calcium carbonate whisker, 1.2 parts of carbon nano tube, 690 parts of common 42.5R portland cement, 212 parts of mineral powder, 160 parts of silica fume, 1060 parts of machine-made sand, 9 parts of additive and 170 parts of water.
After stirring, forming a concrete compressive strength test piece of 100mm multiplied by 100mm, a concrete flexural strength test piece of 100mm multiplied by 400mm, forming an axial tensile strength test piece according to the standard T/CCPA 7-2018 'ultra-high performance concrete basic performance and test method', demoulding after the slurry is hardened, and curing in a standard curing room, wherein the performance test results are shown in table 1.
TABLE 1
In table 1, comparative example 1 is conventional steel fiber-doped ultra-high performance concrete, and comparative example 2 is full-scale fiber-toughened ultra-high performance concrete prepared by a conventional stirring process. Compared with a comparative example, the strength, particularly the breaking strength and the tensile strength, of the ultrahigh-performance concrete in the embodiment of the invention are obviously improved, and the toughness of the ultrahigh-performance concrete can be obviously improved by the full-scale fiber combination preparation process used in the invention.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the above embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope of the invention.
Claims (10)
1. The full-scale fiber toughened ultrahigh-performance concrete is characterized by comprising the following components in parts by weight: 90-250 parts of full-scale fibers, 600-900 parts of cement, 100-300 parts of mineral powder, 100-200 parts of silica fume, 900-1200 parts of fine aggregate, 8-15 parts of an additive and 160-190 parts of water, wherein the full-scale fibers comprise millimeter-scale fibers, micron-scale fibers and nano-scale fibers, the millimeter-scale fibers are steel fibers, the micron-scale fibers are basalt fibers, and the nano-scale fibers are one of calcium carbonate whiskers, carbon nanotubes and a plurality of nano-scale fiber composites.
2. The full-scale fiber toughened ultrahigh-performance concrete according to claim 1, wherein the weight ratio of the millimeter-scale fibers to the micron-scale fibers to the nano-scale fibers is 80-200: 5-20: 5 to 30.
3. The full-scale fiber toughened ultrahigh-performance concrete according to claim 1, wherein the diameter of the millimeter-scale fibers is greater than or equal to 100 μm, the diameter of the micron-scale fibers is 10-100 μm, and the diameter of the nanometer-scale fibers is less than 10 μm.
4. The full-scale fiber-toughened ultra-high performance concrete according to claim 1, wherein said cement is a 52.5R-grade portland cement or a 42.5R-grade portland cement.
5. The full-scale fiber-toughened ultrahigh-performance concrete according to claim 1, wherein the mineral powder is S95-grade mineral powder, and the specific surface area of the mineral powder is greater than or equal to 350m2/kg。
6. The full-scale fiber-toughened ultrahigh-performance concrete according to claim 1, wherein the specific surface area of the silica fume is 15000m or more2/kg，SiO2The content is more than or equal to 85 percent.
7. The full-scale fiber toughened ultrahigh-performance concrete according to claim 1, wherein the fine aggregate is machine-made sand or natural river sand, and the particle size is 0.15-4.75 mm.
8. The full-scale fiber toughened ultrahigh-performance concrete according to claim 1, wherein the additive is a polycarboxylic acid high-efficiency water reducer, the water reduction rate is greater than or equal to 30%, and the solid content is greater than or equal to 40%.
9. The preparation method of the full-scale fiber toughened ultrahigh-performance concrete is characterized by comprising the following steps of:
(1) preparing materials: weighing 90-250 parts of full-scale fibers, 600-900 parts of cement, 100-300 parts of mineral powder, 100-200 parts of silica fume, 900-1200 parts of fine aggregate, 8-15 parts of an additive and 160-190 parts of water;
(2) dry premixing: stirring and dispersing cement, mineral powder, silica fume and fine aggregate to prepare ultrahigh-performance concrete dry powder with good homogeneity;
(3) dispersing: uniformly dispersing the nano-scale fibers into the additive;
(4) wet mixing: pouring the ultra-high performance concrete dry powder into a common forced mixer, adding weighed water and an additive in which nano-scale fibers are dispersed, and uniformly mixing to obtain a slurry material;
(5) fiber dispersion: uniformly adding the weighed millimeter-scale fibers and micrometer-scale fibers into a slurry material, and uniformly stirring to obtain ultra-high performance concrete slurry;
(6) pouring and forming: placing the prepared ultra-high performance concrete slurry in a mould in a pouring mode, and removing the mould after the slurry is hardened to obtain a test piece;
(7) and (5) maintenance: and maintaining the test piece.
10. The method for preparing full-scale fiber-toughened ultra-high performance concrete according to claim 9, wherein the stirring mode in step (2) is vibration stirring, and the dispersion mode in step (3) is ultrasonic dispersion.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679162A (en) * | 2020-12-29 | 2021-04-20 | 江南大学 | Low-shrinkage ultrahigh-strength self-compacting concrete and preparation method thereof |
| CN113087460A (en) * | 2021-03-22 | 2021-07-09 | 北京天地建设砼制品有限公司 | Environment-friendly anti-freezing concrete and preparation method thereof |
| CN113135711A (en) * | 2021-05-10 | 2021-07-20 | 山东省路桥集团有限公司 | Multi-scale fiber modified pervious concrete and preparation method thereof |
| CN113408171A (en) * | 2021-06-28 | 2021-09-17 | 东南大学 | Mechanical property prediction method of ultra-high performance concrete |
| CN113636814A (en) * | 2021-08-16 | 2021-11-12 | 湖南交通职业技术学院 | Ultrahigh-performance concrete and preparation method thereof |
| CN114276075A (en) * | 2021-07-26 | 2022-04-05 | 山西黄河前沿新材料研究院有限公司 | Multi-scale fiber composite reinforced gangue ceramsite concrete and preparation method thereof |
| CN114573299A (en) * | 2022-03-25 | 2022-06-03 | 安徽建筑大学 | Anti-cracking and anti-impact ultrahigh-performance radiation-proof concrete and preparation method thereof |
| CN115385634A (en) * | 2022-09-18 | 2022-11-25 | 大连理工大学 | Multi-scale multi-level steel-renewable plant fiber-nano fibrillated cellulose reduction anti-crack concrete and preparation method thereof |
| CN115417637A (en) * | 2022-08-17 | 2022-12-02 | 广州建筑产业研究院有限公司 | Concrete for prestressed high-performance tubular pile, tubular pile and preparation method |
| CN115991589A (en) * | 2021-10-20 | 2023-04-21 | 山东建筑大学 | High-strength high-ductility cement-based composite material, preparation method thereof and application of nanocellulose in cement-based composite material |
| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112679162A (en) * | 2020-12-29 | 2021-04-20 | 江南大学 | Low-shrinkage ultrahigh-strength self-compacting concrete and preparation method thereof |
| CN113087460A (en) * | 2021-03-22 | 2021-07-09 | 北京天地建设砼制品有限公司 | Environment-friendly anti-freezing concrete and preparation method thereof |
| CN113135711A (en) * | 2021-05-10 | 2021-07-20 | 山东省路桥集团有限公司 | Multi-scale fiber modified pervious concrete and preparation method thereof |
| CN113135711B (en) * | 2021-05-10 | 2022-03-04 | 山东省路桥集团有限公司 | Multi-scale fiber modified pervious concrete and preparation method thereof |
| CN113408171A (en) * | 2021-06-28 | 2021-09-17 | 东南大学 | Mechanical property prediction method of ultra-high performance concrete |
| CN114276075A (en) * | 2021-07-26 | 2022-04-05 | 山西黄河前沿新材料研究院有限公司 | Multi-scale fiber composite reinforced gangue ceramsite concrete and preparation method thereof |
| CN113636814A (en) * | 2021-08-16 | 2021-11-12 | 湖南交通职业技术学院 | Ultrahigh-performance concrete and preparation method thereof |
| CN115991589A (en) * | 2021-10-20 | 2023-04-21 | 山东建筑大学 | High-strength high-ductility cement-based composite material, preparation method thereof and application of nanocellulose in cement-based composite material |
| CN114573299A (en) * | 2022-03-25 | 2022-06-03 | 安徽建筑大学 | Anti-cracking and anti-impact ultrahigh-performance radiation-proof concrete and preparation method thereof |
| CN115417637A (en) * | 2022-08-17 | 2022-12-02 | 广州建筑产业研究院有限公司 | Concrete for prestressed high-performance tubular pile, tubular pile and preparation method |
| CN115385634A (en) * | 2022-09-18 | 2022-11-25 | 大连理工大学 | Multi-scale multi-level steel-renewable plant fiber-nano fibrillated cellulose reduction anti-crack concrete and preparation method thereof |
| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
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Application publication date: 20201020 |