CN110467404B - Method and device for improving ordered arrangement of short fibers in ECC concrete - Google Patents
Method and device for improving ordered arrangement of short fibers in ECC concrete Download PDFInfo
- Publication number
- CN110467404B CN110467404B CN201910876934.4A CN201910876934A CN110467404B CN 110467404 B CN110467404 B CN 110467404B CN 201910876934 A CN201910876934 A CN 201910876934A CN 110467404 B CN110467404 B CN 110467404B
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- short fibers
- ecc concrete
- cement
- sample containing
- ordered arrangement
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- 239000000835 fiber Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 239000012615 aggregate Substances 0.000 claims abstract description 5
- 230000007547 defect Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 4
- 150000004645 aluminates Chemical class 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000009969 flowable effect Effects 0.000 claims description 3
- 239000002367 phosphate rock Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- 239000003469 silicate cement Substances 0.000 claims description 2
- 239000013008 thixotropic agent Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 description 6
- 238000009960 carding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
-
- 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
-
- 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
- C04B28/06—Aluminous 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
- 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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- 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)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method and a device for improving the orderly arrangement of short fibers in ECC concrete, wherein the device comprises a sample containing barrel, a through hole is formed in the bottom of the sample containing barrel, an annular shoulder is reserved at the periphery of the through hole, a bottom plate is placed on the annular shoulder, sieve holes are uniformly distributed on the bottom plate, a circular pressing plate is connected in a sliding manner, and a handle is fixedly connected in the center of the top of the circular pressing plate. According to the invention, cement, mineral admixture, fine aggregate, water, additive and short fibers are utilized to prepare the fluidity ECC concrete, then the fluidity ECC concrete is poured into a sample containing barrel with sieve holes uniformly distributed at the bottom, and a certain pressure is applied to the sample containing barrel, so that the ordered arrangement of fibers in the ECC concrete can be improved after the sieve holes are combed, and the defect of the hetero-directional distribution of the short fibers in the ECC concrete is overcome.
Description
Technical Field
The invention relates to a method and a device for improving ordered arrangement of short fibers in ECC concrete, and belongs to the technical field of ECC concrete.
Background
ECC concrete is widely applied to building and bridge engineering such as earthquake-proof reinforcement and repair due to the advantages of more than 300 times of common concrete in multi-crack cracking and deformation capacity, strong self-repair capacity and the like. At present, the reports at home and abroad mainly focus on fiber selection and improvement of ECC toughness, and related researches on how to improve the ordered arrangement of short fibers in ECC concrete are less.
The forming mode of the ECC concrete is that after cement, fly ash, sand, additive and water are uniformly stirred, fibers are added for stirring, and the short fibers in the formed ECC concrete are distributed in a hybrid way and are randomly distributed in all directions. Short fibers mainly improve the tensile capacity of ECC concrete, but the distribution of the short fibers is hybrid, and the fiber distribution in the tensile direction is only a part of the short fibers, so that the tensile effect of the fibers is weakened.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for improving the ordered arrangement of short fibers in ECC concrete, so as to improve the ordered distribution of the short fibers in the ECC concrete and enhance the tensile effect of the fibers.
The invention is composed as follows: a method for improving the ordered arrangement of short fibers in ECC concrete includes such steps as preparing the flowable ECC concrete from cement, mineral additive, fine aggregate, water, additive and short fibers, pouring it in a barrel with sieve holes uniformly distributed on its bottom, applying a certain pressure to it, and carding by sieve holes to improve the ordered arrangement of fibers in ECC concrete.
Further, the proportion of the cement, the mineral admixture, the fine aggregate, the water, the admixture and the short fiber is as follows: 1:1-1.5:0.2-0.5:0.3-0.6:0.002-0.004:0.03-0.05.
Further, the cement is ordinary silicate cement, aluminate cement or sulphoaluminate cement, and the strength grade of the cement is not lower than 42.5.
Further, the mineral admixture is a mixture of fly ash, silica powder, ground phosphate rock and slag powder.
Further, the fine aggregate is river sand or machine-made sand, and the maximum grain diameter of the fine aggregate is below 0.5 mm.
Further, the additive is one or a mixture of more of a powder water reducing agent, a thickening agent or a thixotropic agent.
Further, the short fibers are one or two of high-strength high-modulus PVA short fibers or high-strength PE short fibers, wherein the tensile strength of the high-strength high-modulus PVA short fibers is required to be more than 1500MPa, and the length of the high-strength high-modulus PVA short fibers is 6-15 mm; the tensile strength of the high-strength PE short fiber is required to be more than 3000MPa, and the length is 6-15 mm.
Meanwhile, the invention also provides a device for improving the ordered arrangement of the short fibers in the ECC concrete for the method, which comprises a sample containing barrel, wherein a through hole is formed in the bottom of the sample containing barrel, an annular shoulder is reserved at the periphery of the through hole, a bottom plate is placed on the annular shoulder, sieve holes are uniformly distributed on the bottom plate, a circular pressing plate is connected in a sliding manner, and a handle is fixedly connected in the center of the top of the circular pressing plate.
Further, the bottom plate is in clearance fit with the sample containing barrel, the aperture of the sieve holes is 2mm, 4mm or 6mm, and the aperture is selected according to the length and the length of the fibers.
Due to the adoption of the technical scheme, the invention has the advantages that: according to the invention, cement, mineral admixture, fine aggregate, water, additive and short fibers are utilized to prepare the fluidity ECC concrete, then the fluidity ECC concrete is poured into a sample containing barrel with sieve holes uniformly distributed at the bottom, and a certain pressure is applied to the sample containing barrel, so that the ordered arrangement of fibers in the ECC concrete can be improved after the sieve holes are combed, and the defect of the hetero-directional distribution of the short fibers in the ECC concrete is overcome.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals illustrate: 1-sample holding barrel, 2-bottom plate, 3-annular shoulder, 4-through hole, 5-sieve mesh, 6-circular pressing plate and 7-handle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
Embodiments of the invention: as shown in fig. 1, the device for improving the ordered arrangement of short fibers in ECC concrete comprises a sample containing barrel 1, wherein a through hole 4 is formed in the bottom of the sample containing barrel 1, an annular shoulder 3 is reserved at the periphery of the through hole 4, a bottom plate 2 is placed on the annular shoulder 3, sieve holes 5 are uniformly distributed on the bottom plate 2, a circular pressing plate 6 is connected in an inner sliding manner, and a handle 7 is fixedly connected to the center of the top of the circular pressing plate 6. The bottom plate 2 is in clearance fit with the sample containing barrel 1, and the aperture of the sieve holes 5 is 4mm.
The invention discloses a method for improving ordered arrangement of short fibers in ECC concrete, which comprises the following steps:
firstly, preparing the fluidity ECC concrete by using cement, mineral admixture, fine aggregate, water, additive and short fiber, wherein the proportions of the cement, the mineral admixture, the fine aggregate, the water, the additive and the short fiber are as follows: 1:1:0.2:0.3:0.002:0.03.
The cement is aluminate cement, and the strength grade is not lower than 42.5.
The mineral admixture is a mixture of fly ash, silica powder, ground phosphate rock and slag powder.
The fine aggregate is river sand, and the maximum grain diameter is below 0.5 mm.
The additive is a mixture of a powder water reducer and a thickener.
The short fiber is a high-strength high-modulus PVA short fiber, the tensile strength of which is required to be more than 1500MPa, and the length of which is 8mm.
Step two, according to the length of the fiber in the ECC concrete, different bottom plates 2 can be selected; the pore diameters of the sieve pores 5 of different bottom plates 2 are different and can be divided into sieve pores 5 with three pore diameters, namely, the pore diameter of the sieve pores 5 is 2mm, 4mm or 6mm; then placing the selected bottom plate 2 into the bottom of the sample containing barrel 1, and erecting the bottom plate 2 on the annular shoulder 3;
pouring the prepared ECC concrete in the step one into the sample containing barrel 1, applying pressure to the sample containing barrel 1 through the circular pressing plate 6, enabling the ECC concrete to flow out of the sieve holes 5 on the bottom plate 2, and effectively improving ordered arrangement of fibers in the ECC concrete after carding through the sieve holes 5, so that the defect of heterogeneous distribution of short fibers in the ECC concrete is overcome, and pouring or smearing the ordered ECC concrete.
Claims (5)
1. A method for improving the ordered arrangement of short fibers in ECC concrete is characterized by comprising the following steps: firstly, preparing flowable ECC concrete by using cement, mineral admixture, fine aggregate, water, additive and short fibers, pouring the flowable ECC concrete into a sample containing barrel with sieve holes uniformly distributed at the bottom, and applying certain pressure into the sample containing barrel, so that the ordered arrangement of fibers in the ECC concrete can be improved after the sieve holes are combed, and the defect of the hetero-directional distribution of the short fibers in the ECC concrete is overcome; the proportion of the cement, the mineral admixture, the fine aggregate, the water, the admixture and the short fiber is as follows: 1:1 to 1.5:0.2 to 0.5:0.3 to 0.6:0.002 to 0.004:0.03 to 0.05; the short fibers are one or two of high-strength high-modulus PVA short fibers or high-strength PE short fibers, wherein the tensile strength of the high-strength high-modulus PVA short fibers is required to be more than 1500MPa, and the length of the high-strength high-modulus PVA short fibers is 6-15 mm; the tensile strength of the high-strength PE short fiber is required to be more than 3000MPa, and the length is 6-15 mm; the device comprises a sample containing barrel (1), wherein a through hole (4) is formed in the bottom of the sample containing barrel (1), an annular shoulder (3) is reserved at the periphery of the through hole (4), a bottom plate (2) is placed on the annular shoulder (3), sieve holes (5) are uniformly distributed on the bottom plate (2), a circular pressing plate (6) is connected in a sliding manner, and a handle (7) is fixedly connected in the center of the top of the circular pressing plate (6); the bottom plate (2) is in clearance fit with the sample containing barrel (1), and the aperture of the sieve holes (5) is 2mm, 4mm or 6mm.
2. The method for improving the ordered arrangement of short fibers in ECC concrete according to claim 1, wherein the method comprises the following steps: the cement is ordinary silicate cement, aluminate cement or sulphoaluminate cement, and the strength grade of the cement is not lower than 42.5.
3. The method for improving the ordered arrangement of short fibers in ECC concrete according to claim 1, wherein the method comprises the following steps: the mineral admixture is a mixture of fly ash, silica powder, ground phosphate rock and slag powder.
4. The method for improving the ordered arrangement of short fibers in ECC concrete according to claim 1, wherein the method comprises the following steps: the fine aggregate is river sand or machine-made sand, and the maximum grain diameter of the fine aggregate is below 0.5 mm.
5. The method for improving the ordered arrangement of short fibers in ECC concrete according to claim 1, wherein the method comprises the following steps: the additive is one or a mixture of more of a powder water reducer, a thickener or a thixotropic agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910876934.4A CN110467404B (en) | 2019-09-17 | 2019-09-17 | Method and device for improving ordered arrangement of short fibers in ECC concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910876934.4A CN110467404B (en) | 2019-09-17 | 2019-09-17 | Method and device for improving ordered arrangement of short fibers in ECC concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110467404A CN110467404A (en) | 2019-11-19 |
| CN110467404B true CN110467404B (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910876934.4A Active CN110467404B (en) | 2019-09-17 | 2019-09-17 | Method and device for improving ordered arrangement of short fibers in ECC concrete |
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| Country | Link |
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| CN (1) | CN110467404B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10286821A (en) * | 1997-04-15 | 1998-10-27 | Ohbayashi Corp | Manufacture of fiber-reinforced concrete |
| JP2005067945A (en) * | 2003-08-22 | 2005-03-17 | Ps Mitsubishi Construction Co Ltd | Super-high strength high toughness mortar |
| CN101289290A (en) * | 2007-04-20 | 2008-10-22 | 天津市奥立纤维水泥制品厂 | Complex fiber cement well lid and method for preparing same |
| CN107651925A (en) * | 2017-11-02 | 2018-02-02 | 中晶蓝实业有限公司 | The production method of fibre cement product based on carbide slag desulfurization |
| CN109206101A (en) * | 2017-06-29 | 2019-01-15 | 河北卓达建材研究院有限公司 | A kind of stream slurry shaping powder coal ash-alkaline residue cementitious material purposes |
| CN210999227U (en) * | 2019-09-17 | 2020-07-14 | 贵州中建建筑科研设计院有限公司 | Improve device that short fiber orderliness was arranged in ECC concrete |
-
2019
- 2019-09-17 CN CN201910876934.4A patent/CN110467404B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10286821A (en) * | 1997-04-15 | 1998-10-27 | Ohbayashi Corp | Manufacture of fiber-reinforced concrete |
| JP2005067945A (en) * | 2003-08-22 | 2005-03-17 | Ps Mitsubishi Construction Co Ltd | Super-high strength high toughness mortar |
| CN101289290A (en) * | 2007-04-20 | 2008-10-22 | 天津市奥立纤维水泥制品厂 | Complex fiber cement well lid and method for preparing same |
| CN109206101A (en) * | 2017-06-29 | 2019-01-15 | 河北卓达建材研究院有限公司 | A kind of stream slurry shaping powder coal ash-alkaline residue cementitious material purposes |
| CN107651925A (en) * | 2017-11-02 | 2018-02-02 | 中晶蓝实业有限公司 | The production method of fibre cement product based on carbide slag desulfurization |
| CN210999227U (en) * | 2019-09-17 | 2020-07-14 | 贵州中建建筑科研设计院有限公司 | Improve device that short fiber orderliness was arranged in ECC concrete |
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| CN110467404A (en) | 2019-11-19 |
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