KR101583001B1 - Using a high-performance two-layer concrete pavement concrete apparatus and method - Google Patents

Abstract

The present invention relates to a method of forming a two-layer concrete pavement by a conventional concrete produced from a single plant plant, and a high-strength and high-durability high-performance concrete mixed with a bubble and a mixed material in the ordinary concrete, Layer concrete paving apparatus and method using a high-performance concrete in which an upper layer is packed so as to be laminated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance two-layer concrete pavement concrete apparatus and method,

The present invention relates to a two-layer concrete paving method and apparatus, and more particularly, to a two-ply concrete pavement method and apparatus, in which a lower layer of a two-layer concrete pavement is formed by ordinary concrete produced in a single plant plant, The present invention relates to a two-layer concrete paving apparatus and method using a high-performance concrete in which a high-strength and high-durability high-performance concrete is packed on an upper surface of a lower layer so that an upper layer is laminated to a thickness thinner than a thickness of a lower layer.

Generally, the concrete pavement is produced by the concrete plant with a slump of 40 mm or less in the plant and is transported to the dump truck and then laid using a slip form paver. The design life of the jointed concrete pavement, which forms joints at regular intervals on the pavement surface of the concrete pavement, has been applied for 20 years. However, many damage such as spalling, cracking, So that the use performance is rapidly reduced.

Two-layer concrete pavement has been developed and applied in Europe and the like to prevent premature damage of the concrete pavement and to ensure long-life serviceability. That is, the lower layer of the two-layer concrete pavement is usually used as concrete for economical efficiency, and the upper layer is made of high-performance concrete for durability on the upper surface thereof. In order to install two layers of concrete, There is a problem in that it is difficult to operate the plant and the construction cost increases.

A hybrid road pavement material and road pavement method have been disclosed in Korean Patent Laid-Open No. 10-2007-0095661 as a method of maintaining high strength while improving durability.

The present invention relates to an asphalt pavement, and more particularly, to a pavement asphalt pavement which comprises a pavement asphalt pavement, an asphalt pavement, And injecting the resin composition to form a resin packing layer on the semi-rigid packaging layer.

However, since the process of forming the infiltration resin layer between the semi-rigid packaging layer and the resin packing layer is complicated, there is a problem that the construction and curing period are increased and the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for forming a two-layer concrete pavement by forming a lower layer of a concrete pavement with water, cement, Layered concrete with high-strength and high-durability high-performance concrete mixed with high-strength concrete and having a thickness lower than that of the lower layer on the lower layer.

Another object of the present invention is to provide a method for forming a lower layer by using ordinary concrete produced in a single plant plant in a two-layer concrete pavement in which a lower layer of ordinary concrete and an upper layer of high- The present invention provides a two-layer concrete paving apparatus and method using a high-performance concrete that can improve workability and economy by forming and stacking high-performance concrete by injecting air bubbles and mixed materials into an upper layer stacked on an upper surface.

The present invention relates to a two-layer concrete paving apparatus using high-performance concrete,

A conventional slip form paver which forms a lower layer of a two-layer concrete pavement with a slump of 40 mm or less normal concrete;

A high-performance concrete forming unit for mixing the bubble slurry with the ordinary concrete to form a high-performance concrete;

A high-performance concrete discharging unit discharging high-performance concrete to the upper surface of the lower layer while dissipating bubbles contained in the high-performance concrete to form an upper layer of the two-layer concrete pavement;

And a vibration workbench provided on the slip foam paver for vibrating the high-performance concrete forming the upper layer.

The present invention relates to a two-layer concrete paving method using high-performance concrete,

Pressing a normal concrete with a slump of 40 mm or less with a conventional slip form paver to form a lower layer of a two-layer concrete pavement;

Forming a high-performance concrete by mixing the bubble slurry with the ordinary concrete;

A high-performance concrete discharging step of discharging high-performance concrete to the upper surface of the lower layer while dissipating bubbles contained in the high-performance concrete to form an upper layer of the two-layer concrete pavement;

And forming the upper part of the two-layer concrete pavement by using a vibrating workbench provided on the slip foam paver to form the upper layer of the high-performance concrete.

According to the present invention, it is possible to form a lower layer of a two-layer concrete pavement with a normal concrete produced from a single plant plant, and to mix the high-strength and high-durability high-performance concrete mixed with bubbles and mixed materials in the above- Layer concrete that is laminated with a thinner thickness than the first concrete pavement, the construction and curing time of the two-ply concrete pavement can be shortened, and the construction and economy can be improved.

1 is a flow chart
Figures 2 to 3 are schematic views of the present invention
4 is a cross-sectional view of the concrete
5 is a view showing a slurry of the present invention
6 is a view for forming the bubble slurry of the present invention
Figure 7 is an enlarged view of the bubble slider of the present invention
8 to 9 show the construction process of the present invention
10 to 11 are slump photographs of normal concrete, high-performance concrete applied to the present invention
12 is a graph showing the discharge process of the high performance concrete according to the present invention
13 is a cross-sectional view of the high-
14 is a sectional view of a two-layer concrete pavement according to the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a flow chart of the present invention, and Figs. 2 to 3 are schematic views of the present invention.

The two-layer concrete pavement apparatus 100 using the high performance concrete according to the present invention comprises a conventional slip form paver 110 (see FIG. 1), which forms a lower layer 51 of a two-layer concrete pavement 50 with a slump of 40 mm or less, And a high performance concrete forming part 120 for forming a high performance concrete 124 by mixing the bubble slurry 123 with the ordinary concrete is formed in the high performance concrete 124. The high performance concrete forming part 120, A high performance concrete discharging portion 130 for discharging the high performance concrete 124 to the upper surface of the upper layer 51 and forming the upper layer 52 of the two-layer concrete pavement 50, And a vibrating table 140 installed on the slip foam paver 110 so as to vibrate the vibrating table 124 by vibrating the vibrating table 124. More specifically, the vibrating table 140 will be described below.

The high performance concrete forming unit 120 is provided with a hopper 121 for supplying a normal concrete to a tip end of the slip foam pamper 110. The hopper 121 is connected to the high performance concrete pumping unit 130, And a bubble slurry 123 for mixing with ordinary concrete so as to increase the slump of the ordinary concrete moved to the connecting member 122 And a screw 125 that mixes the normal concrete and the bubble slurry 123 to form a high-performance concrete 124. The high-

The bubble slurry 123 is preferably mixed with a slurry in which bubbles and water and a mixed material are mixed.

It is preferable that the mixed material is one or more of silica fume, meta kaolin, fly ash, fine powder of blast furnace slag, latex, polymer and coloring agent.

The high performance concrete discharge unit 130 is provided with a discharge guide member 131 for receiving the high performance concrete 124 and discharging the high performance concrete 124 to the upper surface of the lower layer. The high performance concrete 124, which is supplied to the discharge guide member 131, And an air supply hole 132 penetrating the discharge guide member 131 to supply air containing high pressure of 5 atm or higher and to dissipate the air.

Hereinafter, the operation of the present invention will be described.

4, water, cement, aggregate, and the like supplied from the plant 10 are mixed and mixed at a predetermined ratio to form a normal concrete having a slump of 40 mm or less, and then the dump truck 40 To the site of the two-story concrete pavement (50).

5 to 6, a mixed material such as silica fume, metakaolin, fly ash, latex, polymer and the like is mixed with water at a ratio of 1: 1, The slurry is produced by mixing the slurry, the foaming agent and the bubbles produced in the bubble generator with a mixing device such as a vertical stirring screw to form a foam slurry, and then the mixture is added to the ordinary concrete.

The bubble slurry is preferably mixed with 1 kg of a slurry containing water and a mixed material in an amount of 8 to 10 L, but it is preferable to mix the slurry in consideration of the strength and slump of the high performance concrete 124. The reason why the bubble slurry is produced by the mixing apparatus of the up-and-down stirring screw or the like is that the separation phenomenon of the material due to the difference in weight between the slurry and the bubble can be overcome and the bubble of the bubble slurry is light, It is impossible.

The high performance concrete 124 refers to concrete having high strength and high durability compared to ordinary concrete. High strength means strength of 35 MPa or more, and high durability means concrete having freeze-thaw resistance of 90% or more.

An enlarged photograph of the bubble slurry mixed by the mixing apparatus of the up-and-down stirring screw is shown in FIG. 7, the size of the bubble A contained in the bubble slurry is about 0.1 to 1 mm, (A) and the silica fume (S) are distributed evenly among the mixed materials.

Here, the silica fume of the mixed material is usually mixed in an amount of 5 to 15 parts by weight based on 100 parts by weight of the cement forming the concrete, and the meta kaolin is mixed with 7 to 20 parts by weight based on 100 parts by weight of the concrete forming the concrete. The fly ash and the blast furnace slag are usually mixed in a proportion of 15 to 25 parts by weight based on 100 parts by weight of the cement forming the concrete and the latex and the polymer are preferably mixed with 3 to 15 parts by weight based on 100 parts by weight of the concrete forming the concrete Do. If it is less than the above range, the high strength and high durability are inferior. If it exceeds the above range, the high cost and high durability are not higher than the above range, and the construction cost rises.

The coloring agent of the mixed material is preferably mixed in an amount of 2 to 7 parts by weight based on 100 parts by weight of the cement forming the concrete. The chromaticity of the asphalt pavement is shown using iron oxide as the coloring agent, In case of exceeding the asphalt pavement chromaticity, the cost of construction is increased because there is no difference in the degree of asphalt pavement.

On the other hand, when the ordinary concrete that has been field-transferred by the dump truck 40 is put into the field ground, as shown in FIGS. 8 to 9, the ordinary concrete is sliced by a slip form paver 200 to 300 mm A lower layer 51 of the two-layer concrete pavement 50 is formed which is planarized by the flat workbench 111 with a width and a width of a first lane through a third lane.

When the lower layer 51 of the two-layer concrete pavement 50 is formed, the ordinary concrete is supplied to the hopper 121 of the high-performance concrete forming part 120, and the high- And a bubble slurry in which bubbles and a slurry in which water and a mixed material are mixed is introduced into ordinary concrete which is supplied to the hopper 121 and moves along the connecting member 122, The mixing ratio of the normal concrete to the air bubble slurry is usually 300 to 400 liters of the air bubble slurry per cubic meter of the concrete, which is preferably about 20 to 40% of the amount of the air bubble mixed with the air bubble slurry.

The high performance concrete forming part 120 is a vertical stirring mixer and is formed so as to be inclined so that the outlet side is higher than the inlet side so that the bubble slurry and the ordinary concrete can be easily mixed by the height difference of the screw 125 .

The high-performance concrete 124 mixed with the bubble slurry is mixed with the bubbles by the ball bearing effect of the bubbles, and the fluidity is significantly increased due to the mixing of the bubbles. FIG. 11 shows that the slump of the high performance concrete 124 mixed with the foamed slurry into the ordinary concrete is widened to a large extent It is 230 mm larger than the other. That is, FIG. 10 shows that the amount of air existing in the ordinary concrete before mixing the air bubble slurry into the ordinary concrete was 3%, while the amount of air existing in the high performance concrete 124 in which the air bubble slurry was mixed with the ordinary concrete was 26% Of the total population.

However, in the case of high-performance concrete (124) containing a large amount of air, the strength and durability are largely lowered, and usually included in ordinary concrete The compressive strength is reduced by about 4% when the amount of air in the concrete is increased by 1% in relation to the amount of air to be compressed and the compressive strength. That is, since the high-performance concrete 124 containing a large amount of air is greatly reduced in strength, it is difficult to use as a structural material, and the slump is greatly increased, thereby deviating from the workability range due to high-performance concrete discharge.

12, in order to reduce a large amount of air contained in the high-performance concrete 124 of the high-performance concrete forming unit 120, a defoaming agent may be added or the high-performance concrete discharging unit 130 may discharge .

The defoaming agent is preferably mixed with 0.1 to 2.0 parts by weight based on 100 parts by weight of the high-performance concrete for the purpose of removing bubbles uniformly dispersed in the high-performance concrete 124.

When discharging the high performance concrete 124 to the high performance concrete discharging unit 130, the high performance concrete is supplied to the entrance of the discharge guide member 131 detachably mounted to the high performance concrete forming unit 120.

Since the diameter of the center portion of the discharge guide member 131 is smaller than the diameter of both ends of the discharge hole 131, the high performance concrete 124 discharged from the discharge guide member 131 is compressed and pressure is generated.

13, the high-performance concrete 124 is discharged to the outlet of the discharge guide member 131 via the central portion of the discharge guide member 131, and at the same time, the high- Is swirled and discharged to the outlet of the discharge guide member (131) through the air supply hole (132) radially inclined to the outer peripheral surface of the member (131). At this time, the compressed air and the high-performance concrete 124 are spread by the spraying method, and when the compressed air and the high-performance concrete 124 are spread by the spraying method, the compressed air and the high- A large amount of air bubbles are dissipated.

The amount of bubbles contained in the high-performance concrete 124 in which the bubbles dissipate is close to the range of the amount of air contained in the ordinary concrete before mixing the bubble slurry, and the amount of air contained in the high-performance concrete is reduced to 3 to 7% Of course, it can be reduced to a slump of 40 mm or less to discharge the high-performance concrete 124 securing workability, high strength and high durability. Table 1 below shows the slump and air volume of high-performance concrete with bubble-free high-performance concrete mixed with ordinary concrete, bubble slurry before bubble slurry was mixed with ordinary concrete with slump 0 mm and slump 80 mm.

Plain concrete classification Concrete condition Slump (mm) Air volume (%)
Concrete
(Slump 0mm) Plain concrete 0 4.2 When the bubble slurry is mixed
High-performance concrete 200 26.0 Bubble dissipated
High-performance concrete 0 4.3
Plain concrete
(Slump 80mm) Plain concrete 80 6.5 When the bubble slurry is mixed
High-performance concrete 270 37.0 Bubble dissipated
High-performance concrete 125 4.5

Table 2 below shows the required properties of the two-layer concrete pavement (50).

Item layer standard Test Methods slump Upper layer 30 ± 10 mm KS F 2403 Bottom layer 20 mm or less Air volume Upper layer 4 to 7% KS F 2409 Bottom layer 4 to 7% Compressive strength (28 days) Upper layer 40 MPa KS F 2405 Bottom layer 30 MPa Flexural strength (28 days) Upper layer 7.0 MPa KS F 2408 Bottom layer 4.5MPa 56 days pitch characteristics Upper layer Below 1000 Coulombs KS F 2711 Freeze-thaw Upper layer More than 80% KS F 2456 Surface peel resistance Upper layer 0.1 kg / m 2 or less ASTM C 672

When the high performance concrete 124 discharged to the discharge guide member 131 of the high performance concrete discharge unit 130 is placed on the upper surface of the lower layer 51 of the two-layer concrete pavement 50, as shown in FIG. 14, The high performance concrete 124 poured on the upper surface of the lower layer 51 is applied to the slip form paver 110 by the operation of the vibration table 140 provided as high as the thickness of the upper layer 52, Layer concrete pavement 50 can be formed by curing and forming an upper layer 52 that maintains a horizontal surface while being cured.

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, silica fume, meta kaolin, fly ash, blast furnace slag powder, latex, polymer and the like are exemplified as the mixed material in the above embodiment. However, other mixed materials, Needless to say, the manufacturing apparatus and the manufacturing method of the present invention can be applied to a material.

100: Two-layer concrete pavement device 110: Slip foam paver
120: high performance concrete forming part 130: high performance concrete discharging part
140: Vibration table

Claims (10)

A conventional slip form paver which forms a lower layer of a two-layer concrete pavement with a slump of 40 mm or less normal concrete;
A hopper for supplying the ordinary concrete to the tip of the slip foam paver and a connecting member for guiding the movement of the ordinary concrete supplied to the hopper while connecting the hopper and the high performance concrete discharging part, A high performance concrete forming part provided with a bubble slurry for mixing with ordinary concrete to increase the slump of concrete and having a screw for mixing the ordinary concrete and the bubble slurry to form high performance concrete;
And a discharge guide member for receiving high-performance concrete to form an upper layer of the two-layer concrete pavement on the upper surface of the lower layer and discharging the high-performance concrete to the upper surface of the lower layer, wherein the bubbles contained in the high- A high-performance concrete discharging unit having an air supply hole penetrating the discharge guide member to supply and dissipate the air;
And a vibrating work table provided on the slip foam paddle to vibrate the high-performance concrete forming the upper layer. The two-layer concrete paving apparatus using the high performance concrete.
delete The method according to claim 1,
Wherein the bubble slurry is a mixture of bubbles and a slurry in which water and a mixed material are mixed.
[4] The method according to claim 3,
Wherein the mixed material is at least one selected from the group consisting of silica fume, meta kaolin, fly ash, blast furnace slag, latex, polymer and colorant.
delete Pressing a normal concrete with a slump of 40 mm or less with a conventional slip form paver to form a lower layer of a two-layer concrete pavement;
A hopper for supplying the ordinary concrete to the tip of the slip foam paver and a connecting member for guiding the movement of the ordinary concrete supplied to the hopper while connecting the hopper and the high performance concrete discharging part, A high performance concrete forming step having a bubble slurry for mixing with ordinary concrete so as to increase the slump of concrete and having a screw for mixing the ordinary concrete and the bubble slurry to form a high performance concrete;
And a discharge guide member for receiving high-performance concrete to form an upper layer of the two-layer concrete pavement on the upper surface of the lower layer and discharging the high-performance concrete to the upper surface of the lower layer, wherein the bubbles contained in the high- A high performance concrete discharging step provided with an air supply hole penetrating through a discharge guide member so as to supply and dissipate the air;
Wherein the high performance concrete forming the upper layer is formed by a vibration workbench provided on a slip foam paver to form an upper portion of a two-layer concrete pavement.
delete The method of claim 6,
Wherein the bubble slurry is a mixture of bubbles and a slurry containing a mixture of water and a mixed material.
9. The method of claim 8,
Wherein the mixed material is at least one of silica fume, meta kaolin, fly ash, blast furnace slag fine powder, latex, polymer, and coloring agent.
delete

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