CN114920504A - Hybrid fiber reinforced ultra-high performance concrete - Google Patents
Hybrid fiber reinforced ultra-high performance concrete Download PDFInfo
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- CN114920504A CN114920504A CN202210589961.5A CN202210589961A CN114920504A CN 114920504 A CN114920504 A CN 114920504A CN 202210589961 A CN202210589961 A CN 202210589961A CN 114920504 A CN114920504 A CN 114920504A
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- fiber
- high performance
- performance concrete
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- waste tire
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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
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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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- 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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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of building materials, and particularly relates to hybrid fiber reinforced ultra-high performance concrete which comprises 550-650 kg/m 3 50-130 kg/m of cement 3 105-210 kg/m of silica fume 3 80-130 kg/m of fly ash 3 580-680 kg/m of slag powder 3 850 to 1080kg/m of fine aggregate 3 0.5-0.8 wt% of water reducing agent, 0.01-0.05 wt% of plant fiber and 0.02-0.25 wt% of waste tire steel fiber. According to the invention, the plant fiber (flexible fiber) and the waste tire steel fiber (rigid fiber) are compounded to play a 'hybrid effect' of the mixed fiber, and meanwhile, the waste tire steel fiber is wound together by utilizing the winding effect of the plant fiber, so that the steel fiber forms a continuous phase in concrete, and the mechanical property of UHPC is further improved.
Description
Technical Field
The invention relates to the field of building materials, in particular to hybrid fiber reinforced ultra-high performance concrete.
Background
The concrete is a cement-based composite material, and is a hydraulic cementing material formed by using cement as a cementing material and adding various admixtures, aggregates, additives and the like. Since its introduction, it has been widely used in the fields of buildings, bridges, roads, water conservancy and the like by virtue of its advantages of abundant raw materials, low cost, good plasticity and the like, and has gradually become the most widely used and most widely used building engineering material in the world. At present, China is still in the period of large-scale development of infrastructure construction, and the commercial concrete yield of China reaches about 35 billions of cubic meters in 2021 years. However, with the progress of society and the rapid development of economy, super High-rise buildings and large-span bridges at home and abroad grow endlessly, the Performance defects of the common Concrete, such as great self weight, low strength, poor durability, large brittleness and the like, cannot meet the requirements of people on super High-rise and super large span of modern building structures, and the super High Performance Concrete (UHPC) is produced under the background.
In the practical application of UHPC, the problems of high cost, complex production process and the like limit the large-area popularization and application of UHPC, and the existing research shows that the cost of steel fiber with the volume doping amount of only 1 percent exceeds the cost of other UHPC materials. Meanwhile, with the development of society, the demands of modern building structures for super-high-rise and super-large spanning are met, the automobile ownership is promoted year by year due to the improvement of the living standard of people, the pollution of waste tires is brought along, tire oil, rubber particles, carbon black, steel fibers, polymer fibers (nylon fibers) and the like can be obtained after the waste tires are processed by related processing and utilizing equipment, and the steel fibers and the polymer fibers have no good utilization channel. Therefore, the steel fiber and the polymer fiber produced by the waste tire are utilized well, so that the method has great environmental protection value and commercial value.
For the study of steel fibers of waste tires, foreign scholars were the first to try to incorporate waste tire cord fabric fibers into concrete to study the shrinkage and bending strength of the waste cord fabric fiber concrete. Most of the researchers who follow are concerned more about the feasibility, the working performance, the mechanical properties, the length-diameter ratio and the like of the steel fiber reinforced concrete for the scrap tires. Although there has been some research on steel fiber reinforced concrete for scrap tires, there is less research on doping steel fiber for scrap tires in UHPC, and less research on modifying UHPC by mixing it with other fibers.
Disclosure of Invention
The invention aims to solve the problems and provide hybrid fiber reinforced ultrahigh-performance concrete.
In order to achieve the purpose, the invention adopts the technical scheme that:
the hybrid fiber reinforced ultra-high performance concrete comprises 550-650 kg/m 3 50-130 kg/m of cement 3 105-210 kg/m of silica fume 3 80-130 kg/m of fly ash 3 580-680 kg/m of slag powder 3 850 to 1080kg/m of fine aggregate 3 0.5-0.8 wt% of water reducing agent, 0.01-0.05 wt% of plant fiber and 0.02-0.25 wt% of waste tire steel fiber.
Furthermore, the water-to-glue ratio is 0.20-0.22.
Further, the cement is 600-650 kg/m 3 The silica fume is 80-130 kg/m 3 The fly ash is 145-210 kg/m 3 The slag powder is 100-130 kg/m 3 。
Further, the fine aggregate is 620-680 kg/m 3 Coarse aggregate 950E up to E1080kg/m 3 。
Furthermore, the weight percentage of the plant fiber is 0.03-0.05 percent, and the weight percentage of the steel fiber of the waste tyre is 0.15-0.25 percent.
The invention has the beneficial effects that:
(1) the waste tire steel fiber can be used to replace the steel fiber with higher price, so that the production cost of UHPC is reduced, and the waste tire steel fiber is recycled, so that the environmental pollution is reduced;
(2) the plant fiber (flexible fiber) and the waste tire steel fiber (rigid fiber) are compounded to play a role in mixing the fibers, and the waste tire steel fiber is wound together by utilizing the winding effect of the plant fiber, so that the steel fiber forms a continuous phase in concrete, and the mechanical property of the UHPC is further improved;
(3) the mixing mode of the fibers is improved, the fibers are mixed with the water reducing agent solution and then mixed with dry mixing materials such as cement, the dispersibility of the fibers can be improved, and the distribution uniformity of the fibers in concrete is improved.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
The finished product of each cubic meter of the hybrid fiber reinforced ultrahigh-performance concrete is prepared by uniformly mixing the following components in corresponding weight ratio:
a cementitious material comprising: cement 550kg/m 3 50/m of silica fume 3 105kg/m of fly ash 3 80kg/m of slag powder 3 Wherein the cement is PO52.5 ordinary portland cement, the fly ash is I-grade fly ash, and the slag powder is S105-grade slag powder;
an aggregate comprising: fine aggregate 580kg/m 3 980kg/m of coarse aggregate 3 Wherein the fine aggregate is quartz sand (fineness modulus is 1.8), and the coarse aggregate is 5-20mm basalt broken stone in continuous gradation;
the high-efficiency water reducing agent is a high-performance polycarboxylic acid water reducing agent, the water reducing rate is 25%, and the content of the high-efficiency water reducing agent is 0.5 wt% of the cementing material;
the plant fiber and the steel fiber of the waste tire are calculated according to the external doping mass, the doping amount of the plant fiber is 0.05 percent of the using amount of the cementing material, the doping amount of the steel fiber of the waste tire is 0.15 percent of the using amount of the cementing material, wherein the length of the plant fiber is 8mm, the diameter of the plant fiber is 0.15mm, and the length of the steel fiber of the waste tire is 12mm, and the diameter of the steel fiber of the waste tire is 0.18 mm.
Water, and the water-to-glue ratio of the mixture is kept to be 0.2.
The preparation method of the hybrid fiber reinforced ultra-high performance concrete comprises the following steps:
step 1, preparation of the mixture:
firstly adding fine aggregate, water accounting for 50 wt% of total water consumption and a high-efficiency water reducing agent accounting for 80% of total high-efficiency water reducing agent, stirring for 1-2min, then adding cement, silica fume, fly ash and slag powder, and stirring for 2-3min to form a cement paste thin shell with low water-cement ratio; then adding coarse aggregate, stirring for 2-3min, and fully mixing;
step 2, fiber mixing
Adding the residual high-efficiency water reducing agent into the residual water, stirring for 1-2min, and adding plant fiber and waste tire steel fiber to form a fiber mixed solution;
step 3, forming
Adding the fiber mixed solution obtained in the step (2) into the mixture obtained in the step (1), stirring for 1-2min, and pouring into a mold;
step 4, maintenance
And after the finished product is demoulded, curing the concrete product to the age by a conventional method, and finishing the curing to form the finished product concrete.
Example 2
The finished product of each cubic meter of the hybrid fiber reinforced ultrahigh-performance concrete is prepared by uniformly mixing the following components in corresponding weight ratio:
a cementitious material comprising: cement 600kg/m 3 80kg/m of silica fume 3 80kg/m of fly ash 3 80kg/m of slag powder 3 Wherein the cement is PO52.5 ordinary portland cement, the fly ash is I-grade fly ash, and the slag powder is S105-grade slag powder;
an aggregate comprising: 680kg/m fine aggregate 3 880kg/m of coarse aggregate 3 Wherein the fine aggregate is quartz sand (fineness modulus 1.8), and the coarse aggregate is 5-20mm continuous graded basalt broken stone;
the high-efficiency water reducing agent is a high-performance polycarboxylic acid water reducing agent, the water reducing rate is 25%, and the content of the high-efficiency water reducing agent is 0.8 wt% of the cementing material;
the plant fiber and the steel fiber of the waste tire are calculated according to the external doping mass, the doping amount of the plant fiber is 0.03 percent of the using amount of the cementing material, the doping amount of the steel fiber of the waste tire is 0.25 percent of the using amount of the cementing material, wherein the length of the plant fiber is 8mm, the diameter of the plant fiber is 0.15mm, and the length of the steel fiber of the waste tire is 12mm, and the diameter of the steel fiber of the waste tire is 0.18 mm.
Water, keeping the water-to-cement ratio of the mixture at 0.22.
The preparation method of the hybrid fiber reinforced ultrahigh-performance concrete comprises the following steps:
step 1, preparing a mixture:
firstly adding fine aggregate, water accounting for 60 wt% of total water consumption and a high-efficiency water reducing agent accounting for 70% of total high-efficiency water reducing agent, stirring for 1-2min, then adding cement, silica fume, fly ash and slag powder, and stirring for 2-3min to form a cement paste thin shell with low water-cement ratio; then adding the coarse aggregate, stirring for 2-3min, and fully mixing;
step 2, fiber mixing
Adding the residual high-efficiency water reducing agent into the residual water, stirring for 1-2min, and adding plant fiber and waste tire steel fiber to form a fiber mixed solution;
step 3, forming
Adding the fiber mixed solution in the step 2 into the mixture formed in the step 1, stirring for 1-2min, and pouring into a mold;
step 4, maintenance
And after the finished product is demoulded, curing to the age by a conventional method, and forming the finished product concrete after the curing is finished.
Comparative example 1
Comparative example 1 differs from example 2 only in the absence of plant fibers.
Comparative example 2
Comparative example 2 differs from 1 of example 2 in that the fibers are mixed together with dry materials such as cement.
The properties of the hybrid fiber reinforced ultrahigh performance concrete obtained in examples 1 to 2 of the present invention were measured and compared with those of comparative documents 1 to 2, and the measurement results are shown in table 1.
Wherein, the mechanical property test: the cubic compression strength test and the prismatic bending strength test are carried out according to the standard requirements, the size of a cubic test piece is a test block of 100mm multiplied by 100mm, the size of a prismatic test piece is 100mm multiplied by 400mm, and each mixing ratio has 3 groups of parallel tests. Testing was performed after maintenance to specified age (28 days).
TABLE 1 results of Performance test of examples 1-2 and comparative examples 1-2
| Test specimen | Compressive strength/Mpa/28 d | Flexural strength/Mpa/28 d |
| Example 1 | 141.25 | 26.13 |
| Example 2 | 139.35 | 25.88 |
| Comparative example 1 | 128.65 | 21.87 |
| Comparative example 2 | 132.56 | 22.12 |
As can be seen from Table 1, the mechanical properties of single steel fiber doped with UHPC can be improved by the addition of the plant fiber, and the mechanical properties can be improved to a certain extent by the preparation method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (5)
1. The hybrid fiber reinforced ultra-high performance concrete is characterized by comprising 550-650 kg/m 3 50-130 kg/m of cement 3 105-210 kg/m of silica fume 3 80-130 kg/m of fly ash 3 580-680 kg/m of slag powder 3 850 to 1080kg/m of fine aggregate 3 0.5-0.8 wt% of water reducing agent, 0.01-0.05 wt% of plant fiber and 0.02-0.25 wt% of waste tire steel fiber.
2. The hybrid fiber reinforced ultra-high performance concrete according to claim 1, wherein the water-to-cement ratio is 0.20 to 0.22.
3. The hybrid fiber reinforced ultra high performance concrete according to claim 1, wherein the cement is 600 to 650kg/m 3 The silica fume is 80-130 kg/m 3 The fly ash is 145-210 kg/m 3 The slag powder is 100-130 kg/m 3 。
4. The hybrid fiber reinforced ultra high performance concrete according to claim 1, wherein the fine aggregate is 620 to 680kg/m 3 The coarse aggregate is 950-1080 kg/m 3 。
5. The hybrid fiber reinforced ultra-high performance concrete according to claim 1, wherein the vegetable fiber is 0.03 to 0.05 wt% and the steel fiber of junked tires is 0.15 to 0.25 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210589961.5A CN114920504A (en) | 2022-05-26 | 2022-05-26 | Hybrid fiber reinforced ultra-high performance concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210589961.5A CN114920504A (en) | 2022-05-26 | 2022-05-26 | Hybrid fiber reinforced ultra-high performance concrete |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115636642A (en) * | 2022-10-28 | 2023-01-24 | 天津住建混凝土有限公司 | C60 concrete and preparation method thereof |
| CN115724628A (en) * | 2022-11-16 | 2023-03-03 | 华润水泥技术研发有限公司 | Fiber-mixed ultrahigh-performance concrete material and preparation method thereof |
-
2022
- 2022-05-26 CN CN202210589961.5A patent/CN114920504A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115636642A (en) * | 2022-10-28 | 2023-01-24 | 天津住建混凝土有限公司 | C60 concrete and preparation method thereof |
| CN115724628A (en) * | 2022-11-16 | 2023-03-03 | 华润水泥技术研发有限公司 | Fiber-mixed ultrahigh-performance concrete material and preparation method thereof |
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