KR20160001237A - Injection apparatus and method for mix concrete that have been undergoing process of mixing and dissipating air and mixing materials on common concrete - Google Patents

Abstract

The present invention relates to a device and a method for injecting mixed concrete. The method of the present invention comprises a step of mixing air and a powder admixture to normal concrete and dissipating the same. High fluidity concrete with good fluidity is formed by supplying air as much as 20-40% of a volume to the normal concrete. The powder admixture is added into the high fluidity concrete to form mixed concrete, and the mixed concrete is discharged through an injection unit. When the mixed concrete is injected, air contained in the mixed concrete can be dissipated and discharged by high pressure air.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed concrete spraying apparatus and method for mixing and dispersing bubbles and powder mixed materials in a concrete,

The present invention relates to an apparatus and a method for spraying mixed concrete in which bubbles and powder mixed materials are mixed. More specifically, the present invention relates to an apparatus and a method for spraying high-flowable concrete with good fluidity by mixing 20-40% The mixed concrete, which is formed by injecting the powdery mixed material into the high-flowable concrete, is discharged to the jetting section. The air mixed with the high-pressure air is dispersed and discharged. The present invention relates to a mixed concrete spraying apparatus and method through mixing and dissipating materials.

Generally, the functional concrete is formed by mixing various powder mixed materials into the ordinary concrete. For example, it is possible to form the high strength concrete by mixing the silica fume into the ordinary concrete, and to form the color concrete by mixing the iron oxide powder into the ordinary concrete And it is possible to form accelerated concrete by mixing Agunin clinker powder with ordinary concrete.

When the powder mixture material is very fine and is added and mixed in concrete formulations, it is not well dispersed and is pre-blended with Portland cement to be manufactured and used in the form of special mixed cement. In a separate process and stored in a separate storage, which is a factor that greatly increases the production cost.

Therefore, if the powdery mixed material can be mixed with the ordinary concrete and mixed uniformly, the desired functional concrete can be produced only at the cost of the powdery mixed material itself. However, when the powder mixed material is mixed with the ordinary concrete, the powder mixed material is not mixed because of the nature of the concrete, so that the air bubble is usually mixed with the concrete.

The amount of bubbles to be mixed with the above-mentioned ordinary concrete is roughly divided into a small amount of less than 7% and a large amount of not less than 20%, and a small amount of less than 7% is used as an air entrining agent to improve the workability of unhardened concrete And 20% or more of bubbles are used for lightweight foamed concrete. By introducing 20% or more stable pores into hardened paste or mortar, it is possible to reduce the density of concrete, Lightweight.

When the cement paste is used only for the lightweight foamed concrete, the density is about 0.3 to 0.5 t / m.sup.3. When the mortar mixed with fine aggregate is used, the density is about 0.8 to 1.5 t / m.sup.3, , Panels, and fillers.

Bubbles are also used in shotcrete. They are used to increase the pumping capacity of concrete by mixing 10 ~ 20% of concrete with concrete volume, and to increase the build-up thickness after shortening.

Korean Patent No. 10-0568932

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-described problems, and an object of the present invention is to provide a high strength concrete having high fluidity by mixing 20 to 40% When the mixed concrete formed by injecting the mixed material is discharged to the jet part, the air mixed air is dispersed by the high pressure air and discharged, And to provide a mixed concrete spraying apparatus and method.

Another object of the present invention is to provide a method of manufacturing a concrete structure which can produce only a required amount of functional concrete by mixing powder mixed materials in a field on a concrete mixer, And mixing and dissipating the powder mixed material. The present invention also provides a mixed concrete spraying apparatus and method.

The mixed concrete spraying apparatus according to the present invention is a mixed concrete spraying apparatus that mixes and disperses bubbles and powder mixed material in a normal concrete,

A concrete concrete forming part for injecting and mixing water, cement and aggregate into a hopper of a ready-mixed concrete truck to form ordinary concrete;

A high fluidity concrete forming unit for injecting bubbles into the hopper of the remicon truck, mixing the ordinary concrete with bubbles to form a high fluidity concrete having a slump of at least 250 mm;

A mixed concrete forming part for mixing the powdery mixed material, the fluidizing agent and the stone powder into the high-fluid concrete, mixing the mixed powder with the mixed concrete to form a mixed concrete maintaining the set slump;

And a mixed concrete spraying unit spraying the mixed concrete with high-pressure air having a pressure of 5 atm or higher to dissipate the bubbles contained in the mixed concrete to spray the mixed concrete.

In addition, the mixed concrete spraying method through mixing and dissipating bubble and powder mixed material into the concrete of the present invention,

A concrete concrete forming step of injecting and mixing water, cement and aggregate introduced into the hopper of the remicon truck to form ordinary concrete;

A high fluidity concrete forming step of injecting bubbles into the hopper of the remicon truck and mixing the ordinary concrete with bubbles to form a high fluidity concrete having a slump of at least 250 mm;

A mixed concrete forming step of mixing a powder mixture material, a fluidizing agent and a stone powder into the high-fluid concrete, mixing the mixture with a mixing part to form a mixed concrete maintaining a set slump;

And a mixed concrete spraying step of spraying the mixed concrete with air having a high pressure of 5 atm or higher to dissipate the air bubbles contained in the mixed concrete and inject the mixed concrete.

According to the present invention, high-fluidity concrete having good flowability is formed by mixing 20 to 40% of bubbles with volume of ordinary concrete, and when discharging the mixed concrete formed by injecting the powder mixture material into the high- , And the air contained in the mixed concrete is dissipated by the high-pressure air, so that the desired functional concrete can be efficiently produced.

In addition, according to the present invention, when a special mixed cement is used, the desired functional powder mixed material is put into the remicon truck and mixed with each other without requiring any process such as production, movement, storage, etc., And an economical efficiency can be improved by reducing the construction cost.

1 is a flow chart
Fig. 2 is a block diagram
3 is a view showing a concrete concrete forming part of the present invention
4 is a view showing the bubble of the present invention
Fig. 5 is a view showing a state in which bubbles and mixed materials are introduced into the ready-
6 is a view showing the mixing part of the present invention
FIGS. 7 to 8 show slump photographs of the ordinary concrete and the high-melt concrete of the present invention
FIG. 9 is a photograph showing a mixture of air bubbles and silica fumes in the mixed concrete according to the present invention
10 is a slump photograph of the mixed concrete according to the present invention
Figs. 11 to 12 are views for shorting the mixed concrete according to the present invention in a mixed concrete spraying part
13 is a cross-sectional view of the mixed concrete injection part of the present invention
14 is a graph showing the distribution of bubbles contained in mixed concrete shot in the mixed concrete spraying part of the present invention
FIG. 15 is a photograph showing an enlarged photograph of carbon black powder added to ordinary concrete and mixed with ordinary concrete

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a flowchart of the present invention, and Fig. 2 is a block diagram of the present invention.

The mixed concrete spraying apparatus 100 through the process of mixing and dispersing the bubble and powder mixed material into the concrete according to the present invention mixes and mixes the water, cement and aggregate introduced into the hopper 11 of the ready- A bubble is introduced into the hopper 11 of the ready-mixed concrete truck 10, and the ordinary concrete and bubbles are mixed into the mixing part 150 to form a regular concrete A high fluidity concrete forming part 120 forming a high flowable concrete having a slump of 250 mm or more is formed. The powdery mixed material and the fluidizing agent or the fine powder are put into the high fluidity concrete, and mixed with the mixed part 150, The mixed concrete is sprayed with air having a pressure higher than 5 atm to dissipate the bubbles contained in the mixed concrete And a mixed concrete spraying unit 140 for spraying the mixed concrete. The concrete concrete spraying unit 140 will be described in more detail as follows.

The bubbles are preferably produced in a foaming agent and a foaming agent or a bubble generator.

The powder mixed material may be one or more of silica fume, metakaolin, fly ash, blast furnace slab powder, carbon black, iron oxide powder, polymer powder, waste glass powder, rice hull material, expansion material and quick-setting clinker powder.

The powder mixed material is usually mixed in an amount of 1 to 40 parts by weight based on 100 parts by weight of the cement forming the concrete.

The mixed concrete spraying unit 140 is provided with a spraying guide member 141 mounted on a guide member 12 provided in the remicon truck 10 for guiding the movement of the mixed concrete to guide the discharge of the mixed concrete And an air supply hole 142 radially penetrating the jet guide member 141 to supply air of 5 atm or higher to dissipate bubbles contained in the mixed concrete to reduce the amount of air.

The mixing unit 150 includes a shaft 151 that rotates by the power of a motor in the inside of the ready-mix truck 10, and at least one step is formed radially in the shaft 151, And a mixing member 152 for mixing the mixed materials.

The following describes the manufacturing process of the present invention.

3, water, cement, and aggregate supplied to the hopper 11 at a predetermined ratio from the raw material plant BP are supplied to the ordinary ready-mixed truck 10, and the ready- The mixture is mixed to form a concrete having a slump of 60 mm or more, and then transferred to a construction site.

In this case, the ordinary concrete formed in the ready-mixed concrete truck 10 has a reduced fluidity due to the time it takes to move to the construction site, resulting in loss of slump and difficulty in pumping. In order to solve this problem, As shown in FIG. 6, the mixed concrete is mixed with the mixing part 150 to form a high-fluid concrete having a slump of 250 mm or more.

Here, the bubbles normally contain 20 to 40% of the volume of the concrete.

Preferably, the bubbles are produced by foaming agents and foaming agents or bubbler. The foaming agent is an admixture which physically introduces bubbles by a surfactant action by diluting with 30 to 50 times of water. The amount of air bubbles in the present invention is 20 to 40% of the total concrete volume, and the shape of the air bubbles is nearly spherical. The size of the air bubbles is in the range of 0.01 to 0.3 mm .

The powdery mixed material is mixed with 1 to 40 parts by weight based on 100 parts by weight of the cement forming the concrete. The powdery mixed material may be silica fume, meta kaolin, fly ash, blast furnace slab powder, carbon black , Iron oxide powder, polymer powder, waste glass powder, rice hull material, expanding material and quick-setting clinker powder, or by mixing one or more of them, so that the desired functionality can be expressed.

For example, in order to form high-strength concrete, silica fume is usually mixed into concrete. The silica fume is mixed with 5-15 parts by weight based on 100 parts by weight of cement which forms a concrete, and in order to form black concrete, The carbon black is mixed with 1 to 5 parts by weight based on 100 parts by weight of the cement forming the concrete. In order to form the hard steel concrete, usually, the quick-setting clinker powder is mixed into the concrete, The hard clinker powder is usually mixed with 7 to 30 parts by weight based on 100 parts by weight of the concrete forming the concrete.

Here, it is preferable to determine the powder mixed material in consideration of the slump and strength of the final mixed concrete. If the mixing amount of the powder mixed material is smaller than the above range, the high strength and high durability are inferior. , And the cost of construction increases because the high durability does not appear higher.

The mixer 150 mixes the normal concrete and the bubble and the powder mixed material so that the shaft 151 formed in the mixer truck 10 rotates by the power of the motor, The mixing member 152 formed in at least one step in the longitudinal direction is rotated to mix the ordinary concrete with the bubble and the powder mixed material.

FIG. 7 shows a slump of a normal concrete, wherein a slump of a normal concrete formed by a standard mixing ratio of water, cement, and aggregate is 0 mm. FIG. 8 shows a slump of a high- Which is much larger than the slump of concrete. That is, as shown in FIG. 7, the amount of air existing in the ordinary concrete before the introduction of the air bubbles into the ordinary concrete was 3%. However, as shown in FIG. 8, the amount of air existing in the high- .

As described above, the high-fluidity concrete having a slump of 250 mm or more can easily disperse the powdery mixed material due to the high flowability. When the ball-bearing effect of the bubble is manifested, the powdery mixed material is dispersed and mixed uniformly in the high-

FIG. 9 is a photograph of a bubble in a cement paste, and powder mixed material is deposited on the surface of the bubble to be uniformly dispersed in the high flowable concrete when the ball is balled.

However, the strength and durability of the mixed concrete are greatly reduced in the mixed concrete containing a large amount of air bubbles. In the case of the mixed concrete containing a large amount of air bubbles, In case of 1% increase in air content in the mixed concrete in relation to the amount of air contained in the mixed concrete and the compressive strength, the compressive strength is reduced by about 4%. That is, the mixed concrete having a large amount of bubbles as described above is greatly difficult to be used as a structural material because the strength is greatly reduced, and the slump is greatly increased, thereby deviating from the required workability range due to the placement of the mixed concrete.

Therefore, as shown in FIGS. 11 to 12, in order to dissipate the bubbles contained in the mixed concrete which is formed in the ready-mixed concrete truck 10 and moved to the guide member 12, the mixed concrete The mixed concrete discharged through the jet guide member 141 is compressed and discharged because the jet guide member 141 of the mixed concrete jetting unit 140 penetrates through the middle portion of the jet guide member 141 at both ends.

13, when the mixed concrete is compressed and discharged by the jet guide member 141, the air guide hole 142 is formed in the jet guide member 141, The compressed air and the mixed concrete are sprayed and compressed air and the mixed concrete collide with each other and the mixed concrete is broken into small particles so that the mixed air is mixed with the mixed concrete, The bubbles contained are dissipated.

Since the high-pressure compressed air at a pressure higher than 5 atm breaks the mixed concrete into small particles, the air bubbles contained in the mixed concrete dissipate. Therefore, the final air amount is set to 3 To 6%, and the final air amount is slightly different according to the air pressure of the compressed air. The final air is composed of small particles smaller than 200 μm, and the bubbles of particles larger than 200 μm are discharged by high- .

FIG. 14 is a diagram showing a state in which mixed concrete is sprayed by compressed air. It can be seen that almost all the large bubbles are dispersed and small bubbles smaller than 200 μm are mainly present, and the bubble size is the freezing- .

In addition, when the mixed concrete is discharged to the injection guide member 141, the mixed concrete is broken into small particles and strikes the object surface, and local remodeling is performed by the impact of the intergranular particles, thereby dispersing the powdery mixed material. The local remodeling of mixed concrete by scattering and impact energy is well applied in dry shotcrete.

There are two principle of mixing the powdery mixed material into the concrete mixer in a uniform manner when the powdery mixed material is mixed with the ordinary concrete as described above. The first principle is that a large amount of air bubbles are mixed into the concrete, And the second principle is that when discharging the mixed concrete to the injection guide member 141, it is possible to prevent the powder mixture from being mixed in the high-flowable concrete after the ordinary concrete is formed into high-flowable concrete using the ball- The mixed concrete is broken into small particles by high-pressure compressed air, and local dispersion is performed by scattering and impact, and dispersion of the powder mixture is achieved.

15 is an enlarged photograph of carbon black powder according to the present invention, which is usually put into concrete and dispersed, and a test piece is made of black concrete. The carbon black powder is usually 1/500 to 1/700 of that of the Portland cement, and therefore, it is not easy to add and disperse it into the concrete mixer. However, as shown in the photograph, the carbon black powder is well dispersed in the mixed concrete can confirm.

The slump of the final mixed concrete may deviate from the desired fluidity range due to 20 to 40% of bubbles mixed with the high-strength concrete during the formation of the high-kinetic concrete and the powder mixture material to be mixed at the formation of the mixed concrete. In order to control, a fluidizer or a stone is added to form a mixed concrete to form a mixed concrete.

The fluidizing agent may be a high fluidity agent, a high performance fluidizing agent, a water reducing agent, an AE water reducing agent, or the like, and is preferably mixed with 2 to 3 parts by weight based on 100 parts by weight of cement for forming concrete.

The amount of the above-mentioned abrasive powder can be determined by taking into consideration the slump of the final mixed concrete and the degree of the powder mixture of the final mixed concrete. The amount of the abrasive powder to be used is determined based on 100 parts by weight of the cement forming the concrete Preferably 7 to 10 parts by weight.

Table 1 shows the results of the slump 60 mm normal concrete after the field transfer, and the slump 20 mm high strength concrete and the slump 130 mm high strength concrete. The first case shows the process of manufacturing a very small high-strength concrete with a final slump of 20 mm or less. When mixed with 33% of the base material in a slump 60 mm of ordinary concrete, a high-dynamic concrete is formed with a slump of 260 mm, A mixed concrete having a slump of 190 mm is formed. When the mixed concrete is discharged to the concrete spraying unit 140 with high-pressure compressed air at a pressure of 5 atm or higher, a high-strength concrete having a slump of 80 to 90 mm is formed do.

Since the high-strength concrete with a slump of 80 to 90 mm does not conform to the high-strength concrete with a final slump of 20 mm or less, when the mixed concrete containing 7 parts by weight of silica fume is mixed with 3 parts by weight of the dried sand, If the mixed concrete is injected into the concrete spraying part 140 with high-pressure compressed air having a pressure higher than 5 atm, it is possible to manufacture a highly-reinforced concrete having a final air amount of 4.5% and a final slump of 20 mm. Therefore, it is desirable to determine the amount of fluidizing agent and the amount of quartz by the test compounding and the experience, and the second case shows a process of producing a high strength concrete having a final slump.

Functional Concrete Classification Concrete condition Slump (mm) Air volume (%)


High strength concrete
(Final slump 20 mm)
Plain concrete 60 4.2 Bubble inclusion
High flow concrete 260 33.0 7% incorporation of silica fume
Mixed concrete 190 29.0 Addition of fine sand 3%
Mixed concrete 150 28.5 Bubble dissipation
High strength concrete 20 4.5

High strength concrete
(Final slump 130mm)

Plain concrete 60 6.5 Bubble inclusion
High flow concrete 250 32.0 7% incorporation of silica fume
Mixed concrete 185 30.5 Addition of fluidizing agent
Mixed concrete 230 29.5 Bubble dissipation
High strength concrete 130 4.3

The present invention is not limited to the above-described embodiments. Anything having substantially the same constitution as the technical idea described in the claims of the present invention and achieving the same operational effect will be included in the technical scope of the present invention.

Particularly, in the present invention, as the powder mixing material in the above-described embodiment, the powdery mixed material is selected from the group consisting of silica, meta kaolin, fly ash, blast furnace slag, carbon black, iron oxide powder, polymer powder, waste glass powder, rice hull ash, However, it goes without saying that the present invention can also be applied to other powdery mixed materials, which improve the properties of ordinary concrete and are economically feasible, in addition to such powdery mixed materials.

100: Mixed concrete spraying device
110: Plain concrete forming part
120: High-fluidity concrete forming part
130: Mixed concrete forming part
140: Mixed concrete spraying part

Claims (14)

A concrete concrete forming part for injecting and mixing water, cement, and aggregate into the hopper of the ready-mixed concrete truck to form ordinary concrete;
A high fluidity concrete forming unit for injecting bubbles into the hopper of the remicon truck, mixing the ordinary concrete with bubbles to form a high fluidity concrete having a slump of at least 250 mm;
A mixed concrete forming part for mixing the powdery mixed material, the fluidizing agent and the stone powder into the high-fluid concrete, mixing the mixed powder with the mixed concrete to form a mixed concrete maintaining the set slump;
And spraying the mixed concrete with air having a pressure higher than 5 atmospheres to dissipate the bubbles contained in the mixed concrete to spray the mixed concrete. The method for mixing and dispersing bubbles and powder mixed material in a normal concrete, Mixed concrete spraying device through.
The method according to claim 1,
Wherein the bubbles are produced from a foaming agent and a foaming agent or a bubbler, and mixing and dispersing the bubbles and the powder mixed material into the ordinary concrete.
[3] The method according to claim 1,
Characterized in that at least one of silica fume, metakaolin, fly ash, blast furnace slab powder, carbon black, iron oxide powder, polymer powder, waste glass powder, rice hull material, Mixed concrete spraying device by mixing and dissipating bubble and powder mixed material.
The method according to claim 1,
Wherein the powder mixed material is mixed in an amount of 1 to 40 parts by weight based on 100 parts by weight of the cement forming the concrete, and mixing and dissipating the mixed material of bubbles and powder into the ordinary concrete.
[3] The mixed concrete injection system according to claim 1,
An injection guide member mounted on a guide member provided in the ready mixer truck for guiding the movement of the mixed concrete to guide the discharge of the mixed concrete;
And an air supply hole radially penetrating the injection guide member to supply air of 5 atm or higher to dissipate bubbles contained in the mixed concrete to reduce the amount of air. Mixed concrete spraying system through mixing and dissipating materials.
The method of claim 5,
Wherein the injection guide member is formed so as to penetrate through the center portion of the concrete in a smaller size than both ends of the injection guide member, and mixing and dissipating the bubble and powder mixed material in the ordinary concrete.
[2] The apparatus according to claim 1,
A shaft rotatably driven by a motor in the remicon truck;
And a mixing member for mixing at least one or more stages of the concrete with the bubbles and the powder mixing material. The mixed concrete spraying method according to claim 1, Device.
A concrete concrete forming step of injecting and mixing water, cement and aggregate introduced into the hopper of the remicon truck to form ordinary concrete;
A high fluidity concrete forming step of injecting bubbles into the hopper of the remicon truck and mixing the ordinary concrete with bubbles to form a high fluidity concrete having a slump of at least 250 mm;
A mixed concrete forming step of mixing a powder mixture material, a fluidizing agent and a stone powder into the high-fluid concrete, mixing the mixture with a mixing part to form a mixed concrete maintaining a set slump;
And spraying the mixed concrete with air having a pressure higher than 5 atmospheres to dissipate the bubbles contained in the mixed concrete to spray the mixed concrete. The method for mixing and dispersing bubbles and powder mixed material in a normal concrete, Mixed concrete spraying method through.
The method of claim 8,
Wherein the bubbles are produced from a foaming agent and a foaming agent or a bubbler, and mixing and dissolving the bubbles and the powder mixed material in the ordinary concrete.
9. The method according to claim 8,
Characterized in that at least one of silica fume, metakaolin, fly ash, blast furnace slab powder, carbon black, iron oxide powder, polymer powder, waste glass powder, rice hull material, Mixed concrete spraying method by mixing and dissipating bubble and powder mixed material.
The method of claim 8,
Wherein the powder mixed material is mixed in an amount of 1 to 40 parts by weight based on 100 parts by weight of the cement forming the concrete, and mixing and dissipating the mixed material of bubbles and powder into the ordinary concrete.
The method as set forth in claim 8, wherein, in the mixed concrete injection step,
An injection guide member mounted on a guide member provided in the ready mixer truck for guiding the movement of the mixed concrete to guide the discharge of the mixed concrete;
And an air supply hole radially penetrating the injection guide member to supply air of 5 atm or higher to dissipate bubbles contained in the mixed concrete to reduce the amount of air. Mixed concrete spraying method by mixing and dissipating materials.
The method of claim 12,
Wherein the injection guide member is formed so as to penetrate through the center portion of the concrete in a smaller size than both ends of the injection guide member, and mixing and dissipating the bubble and powder mixed material in the ordinary concrete.
9. The apparatus according to claim 8,
A shaft rotatably driven by a motor in the remicon truck;
And a mixing member for mixing at least one or more stages of the concrete with the bubbles and the powder mixing material. The mixed concrete spraying method according to claim 1, Way.

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