KR20160144554A - Method for preparing high strength composite fibers reinforced concrete used for organic and inorganic combined fibers and anti-spalling fibers reinforced concrete manufactured thereby - Google Patents
Method for preparing high strength composite fibers reinforced concrete used for organic and inorganic combined fibers and anti-spalling fibers reinforced concrete manufactured thereby Download PDFInfo
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- KR20160144554A KR20160144554A KR1020150080710A KR20150080710A KR20160144554A KR 20160144554 A KR20160144554 A KR 20160144554A KR 1020150080710 A KR1020150080710 A KR 1020150080710A KR 20150080710 A KR20150080710 A KR 20150080710A KR 20160144554 A KR20160144554 A KR 20160144554A
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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
- C04B14/38—Fibrous materials; Whiskers
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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
- 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
-
- 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
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2046—Shock-absorbing materials
Abstract
Description
The present invention relates to a method for producing a high-strength composite fiber reinforced concrete using an organic-inorganic hybrid fiber, and an explosion-proof fiber reinforced concrete produced thereby.
In recent years, there have been many cases of exposure to earthquakes, explosions, fires, terrorist attacks or exhibits in domestic and foreign countries. As a result, human and material damages are becoming larger, and demands for safety measures against them are increasing. There is a growing interest in improving the impact resistance of structures.
Reflecting this tendency, conventionally, a method of improving the impact resistance by placing reinforcing bars and pouring concrete in order to improve the strength and impact resistance of the concrete has been used, but the performance of the concrete itself has not been improved, There is a problem that a large amount of reinforcing bars are used in the manufacture of the structure, which is not economical.
In order to solve the above problems, Korean Patent Registration No. 10-0620866 discloses a steel fiber reinforced cement composite and a method for manufacturing the same, and utilizes steel fiber in the manufacture of concrete to improve the performance of the concrete itself. A description has been given of a method for manufacturing a concrete composite having high strength, high toughness and high durability.
Korean Patent Registration No. 10-0612269 discloses a technical content of concrete including organic fibers, concrete cement matrix and premix dispersed in cement matrix, and uses the organic fiber in the production of concrete to improve the performance of the concrete itself A method has been disclosed in which a concrete with improved tensile stress can be produced.
However, in the method disclosed in the above documents 1 and 2, there is a convenience of construction due to the use of a single fiber, but most of the cases where a steel fiber or an organic fiber is mixed with 1.0% or more of the concrete volume is used. When the fibers are mixed in a large amount, there is a problem that the quality is lowered due to lowering of fluidity due to fiber bunching phenomenon and lowering of toughness such as tensile strength.
Therefore, in order to solve the above-mentioned problems, there is a need for research on a method for manufacturing high-purity concrete by improving the performance of the concrete itself.
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of manufacturing a fiber- mortar, and (b) molding and wet-curing the mortar. The present invention also provides a method for manufacturing a high-strength composite fiber reinforced concrete using the same.
The mortar has a water binder ratio of 15 to 35% by weight.
Further, the mortar is characterized by comprising the bundled steel fiber and the organic fiber bundle at a ratio of 3: 7 to 7: 3.
The mortar is characterized by containing the above-mentioned steel fiber and organic fiber bundles in an amount of 1.0 to 2.0% by volume based on 1 m 3 of concrete.
The present invention also provides a high-strength explosion-proof fiber reinforced concrete produced by the above-described method.
In order to accomplish the above object, the present invention provides a technique for manufacturing a high-strength composite fiber reinforced concrete by using an organic-inorganic hybrid fiber including steel fiber and organic fiber in the production of concrete I would like to.
According to the manufacturing method of the high-strength composite fiber reinforced concrete using the organic-inorganic hybrid fiber according to the present invention, the slump value is improved due to the use of the attached steel fiber and the organic fiber bundle in the concrete production, , The compressive strength and the tensile strength are improved, and the toughness due to the strain hardening property is improved, so that a high-tensile concrete can be produced.
In addition, the use of organic / inorganic composite fibers can reduce the amount of fiber consumed as compared with the conventional method of producing fiber reinforced concrete using single fibers. Also, by adding organic / inorganic composite fibers, The cost of manufacturing concrete can be reduced.
In addition, the composite fiber reinforced concrete manufactured by the manufacturing method of the high-tenacity composite fiber reinforced concrete according to the present invention has an explosion-proof resistance due to explosion resistance and the like, so that explosion-proof fiber reinforced concrete . ≪ / RTI >
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an image of a bundle of (a) rigid oil and (b) a polyamide fiber bundle used for producing a composite fiber reinforced concrete according to the present invention.
2 is a graph showing the slump value and the air amount test results of the fiber-reinforced concrete fabricated according to the example, the composite fiber-reinforced concrete fabricated according to the comparative example 1 and the comparative example 2;
Fig. 3 is a graph showing the compressive strength of the fiber-reinforced concrete produced according to the example of the composite fiber-reinforced concrete, the comparative example 1 and the comparative example 2, (a) the 7th day and the 28th day compressive strength, and (b) FIG.
Fig. 4 is a graph showing the results of impact resistance tests on the composite fiber reinforced concrete manufactured according to the example, the fiber-reinforced concrete prepared according to the comparative example 1 and the comparative example 2, and the front and back surfaces of the composite fiber- Image.
Hereinafter, the present invention will be described in detail.
The method for manufacturing a high-strength fiber-reinforced concrete using the organic-inorganic hybrid fiber according to the present invention comprises the steps of: (a) mixing water, a binder, an aggregate, a bundle steel fiber and an organic fiber bundle (B) molding the mortar, and wet-curing the mortar.
The step (a) is a step of producing a mortar including water, a binder, an aggregate, a bundle steel fiber, and an organic fiber bundle.
The mortar can be constructed so as to produce a mortar having uniform dispersion by preventing the fluidity from being deteriorated and having no aggregation of fibers during manufacture of the mortar including the attached steel fiber and the organic fiber bundle and the mechanical strength of the composite fiber reinforced concrete It can play a role of improving.
More specifically, the bundle of the above-mentioned steel fibers and organic fibers increases in volume as compared with a conventional steel fiber or organic fiber, so that the fiber bundles are uniformly dispersed in the mortar without causing agglomeration between the fibers.
At this time, the above-mentioned steel fiber has a function to improve the strength of the composite fiber reinforced concrete due to the strength of the steel fiber itself, and it is possible to improve the compressive strength and tensile strength by forming sufficient adhesion with the binder, have.
The organic fiber bundle includes a plurality of strands of organic fibers to improve friction characteristics, thereby increasing the bondability with the composite fiber reinforced concrete, thereby improving the strength of the composite fiber reinforced concrete due to the strength of the fiber bundle itself.
For this purpose, as shown in Fig. 1 (a), the above-mentioned attached steel fiber comprises an attached steel fiber produced by adhering 10 to 1000 strands of a steel fiber with an adhesive and 100 to 1000 strands of organic fibers And the organic fiber bundle prepared by attaching the organic fiber bundle to an adhesive can be used for producing the high-tenacity composite fiber reinforced concrete.
Further, the steel fiber may be configured to be used in the manufacture of a steel fiber having a diameter of 0.1 to 1 mm and a length of 10 to 70 mm.
If the length of the steel fiber is less than 10 mm, it is difficult to control the large cracks formed in the composite fiber reinforced concrete, so that the improvement effect of the tensile strength and the compressive strength may be deteriorated. If the length exceeds 70 mm, Can be degraded.
The organic fibers may be configured to be used for producing organic fiber bundles having a diameter of 0.01 to 1 mm and a length of 5 to 30 mm.
If the length of the organic fibers is less than 5 mm, the contact area between the composite fiber reinforced concrete and the fibers becomes narrow, and the improvement effect of the tensile strength and the compressive strength of the composite fiber reinforced concrete may be deteriorated. The dispersibility of the fibers in the reinforcement may be deteriorated and the physical properties of the concrete may be lowered.
In addition, when the diameter is less than 0.01, the surface area of the fiber increases and the contact area with the composite fiber reinforced concrete increases. However, the strength of the fiber itself may be lowered and the dispersibility of the fiber in the concrete may be decreased. mm, it is preferable to use organic fibers having the above-mentioned diameters and lengths because the surface area of the fibers is decreased to reduce the contact area and the strength may be lowered.
Wherein the organic fiber is selected from the group consisting of polyamide fiber, polypropylene fiber, polyvinyl alcohol fiber, polyester fiber, lyocell fiber, rayon fiber, polyacrylic fiber, polyolefin fiber, polyvinyl chloride fiber, wholly aromatic polyamide fiber, And preferably a polyamide fiber, a polyvinyl acetate fiber, or a polyethylene fiber may be used. Particularly, it is more preferable to use a polyamide fiber having various properties such as alkali resistance, hydrophilicity, vibration reduction property and the like, which can improve various physical properties of concrete.
In addition, the mortar may be configured to include the bundled steel fiber and the organic fiber bundle at a ratio of 3: 7 to 7: 3 in consideration of factors such as strength, durability, water tightness, or crack resistance of the composite fiber reinforced concrete.
Furthermore, the mortar is configured to include the bundled steel fiber and the organic fiber bundle in an amount of 1.0 to 2.0% by volume based on 1 m 3 of concrete, uniformly dispersed in the mortar, and maintained in fluidity to ensure workability .
Meanwhile, in this step, the mortar is produced by mixing the attached steel fiber and the organic fiber bundle showing the above characteristics with water, binder and aggregate.
The mortar may be configured to include a binder and water in consideration of factors such as strength, durability, water tightness, or crack resistance of the composite fiber reinforced concrete. The water binder ratio (W / B) By weight, and the water binding ratio represents the weight ratio of water to 100 parts by weight of the binder.
When the water-binding material ratio is less than 15% by weight, it is advantageous to realize high strength, but the viscosity decreases due to an increase in viscosity of the concrete and a decrease in fluidity due to elapsed time. It is possible to reduce the quality of the concrete due to an increase in shrinkage or a bleeding amount, so that the mortar can be manufactured by appropriately adjusting the above range.
It is preferable that the aggregate is added by controlling the content of the fine aggregate in consideration of factors such as strength, crack resistance or fluidity of the composite fiber reinforced concrete.
The mortar may further comprise fly ash, blast furnace slag, silica-fume or admixture.
More specifically, the present invention provides a method for improving the fluidity of the composite fiber reinforced concrete during the manufacture of the mortar, including the spherical particles of fly ash so as to improve workability, So as to improve the strength.
In addition, the silica mortar composed of ultrafine particles having a particle size of 0.1 占 퐉 or more may be filled in the mortar so as to further enhance the strength of the composite fiber reinforced concrete by filling voids between the cement particles.
The admixture may be any of various known water reducing agents, thickening agents, air entraining agents, waterproofing agents, swelling agents, foaming agents, defoaming agents, and the like.
More specifically, the present invention can be configured to include a water reducing agent to improve workability by improving the fluidity of the composite fiber-reinforced concrete during the production of the mortar. The fluidity of the composite fiber-reinforced concrete and the separation resistance of the cement composite It is possible to constitute a thickener so as to be improved.
In addition, it is possible to improve the workability of the concrete by improving the resistance to freezing and thawing by generating independent minute bubbles in the concrete, and to include the air entraining agent so that the bundle of the steel fibers and the organic fibers are more evenly distributed And may include a waterproofing agent to improve the adhesive strength of the mortar and reduce the absorption ratio and permeability to improve the waterproof performance of the composite fiber reinforced concrete.
The composite fiber reinforced concrete may include a blowing agent to improve the flowability of the composite fiber reinforced concrete, and may include a blowing agent to improve the flowability of the composite fiber reinforced concrete. And a defoaming agent to remove excess air in the fine cement and fine aggregate, if any.
The admixture is preferably added in consideration of factors such as workability, high toughening, fluidity, viscosity, and drying shrinkage control. For this purpose, each of the above fly ash, blast furnace slag, silica fume silica-fume or an admixture may be included in the mortar in an amount of 20 to 50% by weight based on the weight of the cement, and the respective admixtures may be added in a different amount depending on the use of the composite fiber-reinforced concrete.
The step (b) is a step of molding the mortar and wet-curing the mortar. The mortar is molded and wet-cured to produce the composite fiber-reinforced concrete. The mortar can be molded by various known methods , The mortar produced as described above may be supplied to a mold such as a mold to be directly cast on the site, or may be formed by precast casting in a factory.
In addition, the mortar molded as described above can be wet-cured to produce composite fiber-reinforced concrete. The hydration reaction of the composite fiber-reinforced concrete is activated to cure steam at a temperature of 60 to 80 ° C so that curing can proceed smoothly It is possible to construct a composite fiber reinforced concrete having improved mechanical properties.
According to the manufacturing method of the high-strength composite fiber reinforced concrete using the organic-inorganic hybrid fiber according to the present invention, the bundled steel fiber and the organic fiber bundle are included in the bundle of the attached steel fiber and the organic fiber The slump value is improved and the fluidity is increased to improve the workability, the compressive strength and the tensile strength are improved, and the toughness due to the strain hardening property is improved, so that a high-tensile concrete can be manufactured.
In addition, the use of organic / inorganic composite fibers can reduce the amount of fiber consumed as compared with the conventional method of producing fiber reinforced concrete using single fibers. Also, by adding organic / inorganic composite fibers, And the cost of manufacturing concrete can be reduced.
The present invention also provides a high-strength explosion-proof fiber reinforced concrete produced by the above-described method.
The composite fiber reinforced concrete manufactured by the manufacturing method of the high-tensile composite fiber reinforced concrete using the organic-inorganic hybrid fiber according to the present invention is improved in the compressive strength and the tensile strength and is used for the construction of the structure in various construction sites requiring high strength It is possible.
In addition, it is possible to greatly suppress destruction and exfoliation phenomena, and particularly, it is possible to provide protection and explosion-proof fiber reinforced concrete structures, which are intended to protect human lives and property from shell attacks such as military facilities, and survival structures Or for the installation of safety protection facilities to prepare for the explosion of gunpowder, oil, gas storage and handling facilities.
Hereinafter, the present invention will be described in more detail with reference to examples.
The embodiments presented are only a concrete example of the present invention and are not intended to limit the scope of the present invention.
<Examples>
To manufacture the composite fiber reinforced concrete according to the embodiment, a steel fiber having a diameter of 0.3 mm and a length of 40 mm was bonded to a steel fiber of about 100 strands using a water-soluble adhesive to prepare an attached steel fiber.
Further, about 200 strands of polyamide organic fibers having a diameter of 0.3 mm and a length of 20 mm were bonded using a water-soluble adhesive to prepare an organic fiber bundle.
The prepared steel fiber and the organic fiber bundle were mixed with cement, fine aggregate, water reducing agent and water at a mixing ratio of 1: 1 to prepare a mortar. The mortar was supplied to the mold to be molded, the mold was removed, The composite fiber reinforced concrete (width × width × thickness: 30 × 30 × 10) was produced by wet curing.
≪ Comparative Example 1 &
Fiber reinforced concrete was prepared in the same manner as in Example except that the polyamide organic fiber bundle was not incorporated.
≪ Comparative Example 2 &
Fiber reinforced concrete was manufactured in the same manner as in Example except that the attached steel fiber was used in the production of fiber reinforced concrete.
<Experimental Example 1> Analysis of change in slump value and air amount
FIG. 2 shows the analysis results of the fiber-reinforced concrete slump value and the air amount variation according to the composite fiber-reinforced concrete according to the embodiment thus prepared and Comparative Examples 1 and 2. FIG.
As shown in FIG. 2 (a), in the case of the composite fiber reinforced concrete of the example including the organic fiber bundle and the attached steel fiber, the slump value increased by 30% as compared with the concrete average of Comparative Examples 1 and 2 .
In addition, as shown in FIG. 2 (b), it was confirmed that the air amount also increased by 8% compared to the average of the fiber-reinforced concrete of Comparative Examples 1 and 2 in the case of the composite fiber reinforced concrete of the examples. It was confirmed that the slump value and the air amount were increased due to the proper adhesion force between the binders.
≪ Experimental Example 2 > Mechanical strength analysis
The mechanical strength of the composite fiber reinforced concrete according to the above-described Examples and Comparative Examples 1 and 2 was analyzed according to the change of the fiber combination, and the results of the analysis are shown in FIG.
As shown in Fig. 3 (a), in the case of the composite fiber reinforced concrete of the examples including the organic fiber bundle and the attached steel fiber as in the examples, the compressive strength of the concrete at 7 and 28 days And it was confirmed that they showed a tendency to improve about 3% and 14%, respectively, from the average.
In addition, as shown in Fig. 3 (b), in the case of the composite fiber reinforced concrete of the Examples, the tensile strength at the age of 7 days was increased by about 7% compared to the average of the fiber-reinforced concrete of Comparative Examples 1 and 2 It is judged that the strength is improved due to proper crosslinking action between fibers.
<Experimental Example 3> Impact resistance performance analysis
The impact resistance performance of the fiber-reinforced concrete according to the examples and comparative examples 1 and 2 as described above was analyzed according to the fiber combination combination. The analysis results are shown in FIG.
As shown in FIG. 4, it can be seen that the fiber reinforced concrete according to Comparative Examples 1 and 2 exhibits the phenomenon of penetration failure, whereas in the case of the composite fiber reinforced concrete according to the embodiment, It was confirmed that penetration breakage prevention and peeling phenomenon were greatly suppressed and excellent impact resistance performance was obtained.
As a result of the above-mentioned results, it has been found that the method of manufacturing the high-strength fiber-reinforced concrete using the organic-inorganic hybrid fiber according to the present invention includes the bundle of the attached steel fiber and the organic fiber, It is possible to improve the workability, the compressive strength and the tensile strength are improved, and the toughness due to the strain hardening property is improved, so that it is possible to manufacture a high-strength composite fiber reinforced concrete.
Claims (5)
and (b) molding the mortar and wet-curing the fiber-reinforced composite fiber reinforced concrete.
Wherein the mortar has a water binder ratio of 15 to 35% by weight.
Wherein the mortar comprises the bundled steel fiber and the organic fiber bundle at a ratio of 3: 7 to 7: 3.
Wherein said mortar comprises 1.0 to 2.0% by volume of said steel fiber and said organic fiber bundle based on 1 m < 3 > of concrete.
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| KR1020150080710A KR20160144554A (en) | 2015-06-08 | 2015-06-08 | Method for preparing high strength composite fibers reinforced concrete used for organic and inorganic combined fibers and anti-spalling fibers reinforced concrete manufactured thereby |
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| KR1020150080710A KR20160144554A (en) | 2015-06-08 | 2015-06-08 | Method for preparing high strength composite fibers reinforced concrete used for organic and inorganic combined fibers and anti-spalling fibers reinforced concrete manufactured thereby |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102066132B1 (en) | 2019-04-10 | 2020-01-14 | (주)동광기업 | A fiber reinforced blast resistance door |
| KR20200046565A (en) * | 2018-10-25 | 2020-05-07 | 아세아시멘트(주) | Refractory mortar |
| KR102291960B1 (en) * | 2020-11-16 | 2021-08-24 | 나비콘기업 주식회사 | Eco-friendly polymer mortar coposition including eco-friendly lyocell fiber and synthetic zeolite fine powder, manufacturing method and methods cross section recovery using the same |
| KR20230077123A (en) * | 2021-11-25 | 2023-06-01 | 롯데건설 주식회사 | Composite panel for structural explosion-proof reinforcement and its installation structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100612269B1 (en) | 1998-05-14 | 2006-08-11 | 뷰게스 | Concrete comprising organic fibers dispersed in a cement matrix, concrete cement matrix and premixes |
| KR100620866B1 (en) | 2004-02-16 | 2006-09-13 | 한국건설기술연구원 | Steel fiber reinforced cementitious composites and manufacturing method thereof |
| KR101035001B1 (en) | 2010-03-12 | 2011-05-17 | 코오롱건설주식회사 | A cement structure having hybrid fiber |
| KR101253249B1 (en) | 2009-11-11 | 2013-04-16 | 한국건설기술연구원 | Manufacturing methods of ultra-high performance fiber reinforecd concrete mixing the steel fiber of wave and straight type |
-
2015
- 2015-06-08 KR KR1020150080710A patent/KR20160144554A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100612269B1 (en) | 1998-05-14 | 2006-08-11 | 뷰게스 | Concrete comprising organic fibers dispersed in a cement matrix, concrete cement matrix and premixes |
| KR100620866B1 (en) | 2004-02-16 | 2006-09-13 | 한국건설기술연구원 | Steel fiber reinforced cementitious composites and manufacturing method thereof |
| KR101253249B1 (en) | 2009-11-11 | 2013-04-16 | 한국건설기술연구원 | Manufacturing methods of ultra-high performance fiber reinforecd concrete mixing the steel fiber of wave and straight type |
| KR101035001B1 (en) | 2010-03-12 | 2011-05-17 | 코오롱건설주식회사 | A cement structure having hybrid fiber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200046565A (en) * | 2018-10-25 | 2020-05-07 | 아세아시멘트(주) | Refractory mortar |
| KR102066132B1 (en) | 2019-04-10 | 2020-01-14 | (주)동광기업 | A fiber reinforced blast resistance door |
| KR102291960B1 (en) * | 2020-11-16 | 2021-08-24 | 나비콘기업 주식회사 | Eco-friendly polymer mortar coposition including eco-friendly lyocell fiber and synthetic zeolite fine powder, manufacturing method and methods cross section recovery using the same |
| KR20230077123A (en) * | 2021-11-25 | 2023-06-01 | 롯데건설 주식회사 | Composite panel for structural explosion-proof reinforcement and its installation structure |
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