KR101437064B1 - Autoclave curing exposure concrete panel and method manufacturing thereof - Google Patents

Abstract

The present invention relates to an exposed concrete panel with a curing autoclave and to a method of manufacturing the same, the method including: forming a first mixture by mixing a cement, a silica flour, a silica sand, a cellulose fiber, a plaster, a lime and water; forming a second mixture by mixing the first mixture, aluminum oxide (Al_2O_3) and water; hardening the second mixture in a room temperature by disposing the second mixture on a frame; and curing and hardening a hardened object demolded from the frame in an autoclave. According to the present invention, the panel is elegant and easily colored, has excellent weather resistance or water resistance, and the manufacturing method minimizes construction defects because warping does not occur, and may manufacture the exposed concrete panel having various patterns and shapes and reduce manufacturing time while improving productivity.

Description

Technical Field [0001] The present invention relates to an autoclave curing exposed concrete panel and a method of manufacturing the same,

The present invention relates to an autoclave curing-exposed concrete panel and a method of manufacturing the same, more particularly, to a cement-based concrete panel which is easy to color, easy to color, excellent in weatherability and waterproof property, To an autoclave cured exposed concrete panel having improved productivity and a method of manufacturing the same.

Generally, concrete is formed by mixing, molding, and curing by using cement, aggregate, and water as main materials and adding a mixed material as necessary, and is used in various structures.

When such a concrete is kneaded by adding water to the cement, after losing its plasticity characteristic after lapse of a predetermined time, it solidifies and hardens and finally hardens. In order to prevent the occurrence of defects by providing sufficient strength after the hardened concrete is applied It will be cured to protect it for a certain period of time.

The concrete curing process depends on the weather conditions, the size and shape of the structure, the construction period, and the purpose of use. The wet curing, the steam curing, the electric curing and the membrane curing are included. ) Can be used.

On the other hand, exposed concrete is a wet method of casting concrete by casting a concrete in a field and curing it in a natural state for a certain period of time, and not using any other finishing materials such as paint or tile. Recently, there has been exposed concrete panel eh, which is made for construction methods such as stone cladding, that is, attaching natural stone, without such wet construction. These exposed concrete are manufactured by a general curing method in a factory, and some are made by mixing an expandable material such as anhydrous gypsum or adding other effective materials.

As a technique for a conventional panel using exposed concrete, there is disclosed in Korean Patent No. 10-1152880 "Exposed Concrete Finishing Panel and Method of Manufacturing the Exposed Concrete Finishing Panel ", Korean Published Patent Application No. 10-2009-0062535, And a manufacturing method thereof ".

However, in addition to the above-mentioned prior arts, existing technologies related to the manufacture of exposed concrete panels have problems in weatherability or waterproofness of exposed concrete panels made of steam curing, and in particular, to be. Also, since the conventional exposed concrete panel is not demolded until the completion of the steam curing after pouring into the mold, the demolding time is increased and the natural curing is required for at least 7 days after the demolding. Therefore, And the manufacturing cost is increased.

In order to solve the problems of the prior art as mentioned above, the present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a water- It is possible to manufacture a concrete panel, shorten the manufacturing time, and improve the productivity.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided an exposed concrete panel comprising: cement, silica flour, silica sand, cellulose fiber, gypsum, lime, Water is mixed to form a primary mixture, the primary mixture is mixed with aluminum oxide (Al ₂ O ₃ ) and water to form a secondary mixture, the secondary mixture is placed in a mold and cured at room temperature, There is provided an autoclave curing exposed concrete panel in which the cured product demolded from the mold is cured and cured in an autoclave.

Wherein the primary mixture comprises 7 to 15% by weight of the cement, 8 to 16% by weight of the fine silica powder, 50 to 70% by weight of the silica fiber, 2 to 6% by weight of the cellulose fiber, 0.8 to 1.6% 0.5 to 1.1% by weight of water and 5 to 15% by weight of water, wherein the silica sand is composed of silica sand and silica sand in a weight ratio of 1: 0.8 to 1.2, 70 to 85% by weight of the mixture, 5 to 12% by weight of the aluminum oxide, and 10 to 20% by weight of the water.

The secondary mixture is cured at 20 to 30 DEG C for 50 to 70 minutes in the mold, and the cured product can be cured at 150 to 210 DEG C for 6 to 20 hours in the autoclave.

According to another aspect of the present invention, there is provided a method for producing an exposed concrete panel, which comprises mixing a cement, a silica flour, a silica sand, a cellulose fiber, a gypsum, ; Mixing the primary mixture with aluminum oxide (Al ₂ O ₃ ) and water to form a secondary mixture; Placing the secondary mixture in a mold and curing at room temperature; And curing the cured product demolded from the mold in an autoclave and curing the cured product.

Wherein the primary mixture is formed by mixing the cement with 7-15 wt% of the cement powder, 8-16 wt% of the fine silica powder, 50-70 wt% with the silica fiber, 2-6 wt% with the cellulose fiber, 0.8 wt% By weight of the lime, 0.5 to 1.1% by weight of the lime and 5 to 15% by weight of the water, wherein the silica sand is composed of the silica sand in No. 5 and the silica sand in the weight ratio of 1: 0.8 to 1.2, In the mixture forming step, the secondary mixture may comprise 70 to 85 wt% of the primary mixture, 5 to 12 wt% of the aluminum oxide, and 10 to 20 wt% of the water.

The room temperature curing step comprises curing the secondary mixture in a mold at 20 to 30 DEG C for 50 to 70 minutes and the autoclave curing step is a step of curing the cured product in an autoclave at 150 to 210 DEG C for 6 to 20 hours It can be cured.

According to the autoclave curing exposed concrete panel according to the present invention and the method for producing the same, the cement is used after the autoclave curing. However, since the autoclave curing is excellent in whiteness and is easily colored and composed of fine particles, It is possible to manufacture an exposed concrete panel having various patterns and shapes, and it is possible to manufacture the exposed concrete panel after the mixing and pouring process, In addition, since the autoclave can be applied immediately after the autoclave curing for a short time, the production time can be shortened and the productivity can be improved.

1 is a flow chart illustrating a method of manufacturing an autoclave curing exposed concrete panel in accordance with one embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

The autoclave cured exposed concrete panel according to an embodiment of the present invention is formed by mixing cement, silica flour, silica sand, cellulose fiber, gypsum, lime and water to form a primary mixture And a secondary mixture is formed by mixing the primary mixture with aluminum oxide (Al ₂ O ₃ ) and water. The secondary mixture is placed in a mold and cured at room temperature, and the cured product demolded from the mold is autoclave ) And cured.

The primary mixture is composed of 7 to 15% by weight of cement, 8 to 16% by weight of fine silica powder, 50 to 70% by weight of silica sand, 2 to 6% by weight of cellulose fiber, 0.8 to 1.6% by weight of gypsum, 0.5 to 1.1% To 15% by weight. In this case, the silica sand may be formed in a weight ratio of 1: 0.8 to 1.2 in the No. 5 silica sand and the No. 6 silica sand.

The secondary mixture may consist of 70 to 85 wt% of the primary mixture, 5 to 12 wt% of aluminum oxide, and 10 to 20 wt% of water. The secondary mixture can also be cured in a mold at 20 to 30 ° C for 50 to 70 minutes.

The primary mixture or the secondary mixture may further comprise gravel as an aggregate.

The cured product can be cured in an autoclave at 150 to 210 ° C for 6 to 20 hours.

When aluminum oxide such as sintered bauxite (Al ₂ O ₃ .H ₂ O) is added to cement, for example, Portland cement, rapid reaction causes rapid curing with temperature rise. Therefore, according to the embodiment of the present invention, the autoclave curing exposed concrete panel can be demolded at a lapse of about one hour after molding, and can exhibit strength to such an extent that it can be transported.

Figures ginseng lime configuration of compounds of the cement (3CaO · SiO ₂₎ is faster hydration (水和), good strength and contributes to the early strength development. Therefore, a large amount of quartz gypsum is required for the early-strength cement. When the gypsum is present, the condensation time is controlled by the reaction with the gypsum. In this case, time can be derived. That is, as shown in Scheme 1 below, it is chemically induced to generate ettringite, which is calcium sulfo aluminate (3CaO 3Al ₂ O ₃ .CaSO ₄ ) compound, at an early stage.

[Reaction Scheme 1]

₃ CaO.Al ₂ O ₃ + 3 (CaSO ₄ .2H ₂ O) + 26 to 28H ₂ O? ₃ CaO.Al ₂ O ₃ .3 CaSO ₄ .30 to 32 H ₂ O (ettringite)

In addition, most of the conventional cement concrete secondary products are mainly used for the purpose of manifesting the strength by steam curing. In the present invention, curing takes place in an autoclave having a high-temperature and high-pressure facility, which leads to tobermorite as a stable substance. Tobermorite refers to Ca ₅ Si ₆ O ₁₆ (OH) ₂ · 4H ₂ O or Ca ₅ Si ₆ (O, OH) 18 · 5H ₂ O as the calcium silicate hydrate.

The curing of the autoclave is carried out, for example, at a temperature of 180 ° C and a pressure of 10 atmospheres, resulting in osmotic pressure inside the concrete. This will penetrate the hydration reaction to the inside of the concrete.

1 is a flow chart illustrating a method of manufacturing an autoclave curing exposed concrete panel in accordance with one embodiment of the present invention.

Referring to FIG. 1, the method for producing an autoclave curing exposed concrete panel according to an embodiment of the present invention includes cement, silica flour, silica sand, cellulose fiber, gypsum, lime, water by mixing in step (S11) and a step (S12) of forming a second mixture by mixing the first mixture with aluminum oxide (Al ₂ O ₃₎ and water, the mold for the second mixture to form a first mixture A step (S13) of curing at room temperature by pouring, and a step (S14) of curing and curing the autoclave with the cured product demolded from the mold.

The step of forming the primary mixture (S11) comprises the steps of: 7 to 15% by weight of the cement, 8 to 16% by weight of the fine silica powder, 50 to 70% by weight of silica, 2 to 6% by weight of cellulose fibers, %, Lime 0.5-1.1 wt.%, Water 5-15 wt.%. Here, the silica sand may be formed in a weight ratio of 1: 0.8 to 1.2 in the No. 5 silica sand and the No. 6 silica sand. Further, the first mixture may further contain gravel as an aggregate.

The step of forming the secondary mixture (S12) may comprise a secondary mixture comprising 70 to 85% by weight of the primary mixture, 5 to 12% by weight of aluminum oxide, and 10 to 20% by weight of water. The secondary mixture may further contain gravel as an aggregate.

The room temperature curing step (S13) can cure the secondary mixture in a mold at 20 to 30 DEG C for 50 to 70 minutes. Here, in order to form the mold frame, the molding space in which the secondary mixture is placed is formed in a concrete panel shape, for example, the upper part of the molding space is opened, or as another example, . ≪ / RTI > On the other hand, the concrete panel can be manufactured in various sizes including the dimensions (width × length × thickness) of 500 mm × 500 mm × 25 mm, 600 mm × 600 mm × 25 mm, and 600 mm × 1,200 mm × 25 mm.

In the autoclave curing step (S14), the cured product which is firstly cured from the mold and demolded can be cured in the autoclave at 150 to 210 DEG C for 6 to 20 hours.

<Example 1>

(1) A concrete panel (500 mm (width) x 500 mm (length) x 25 mm (thickness)) according to the composition and condition as shown in Table 1 below as Experimental Example 1 according to the autoclave curing- Respectively.

During primary mixing
(Preparation of primary mixture) Cement (general Portland cement): 11 wt%
Silica fine powder: 12 wt%
No. 5 Silica: 30 wt%
No. 6 Silica: 31 wt%
Cellulose fiber: 4 wt%
Gypsum: 1.2 wt%
Lime: 0.8 wt%
Water: 10 wt% During second mixing
(Preparation of the second mixture) Primary mixture: 77 wt%
Aluminum oxide: 8 wt%
Water: 15 wt% Primary hardening
(Mold curing) 25 ° C, 1 hour, atmospheric pressure Secondary hardening
(Autoclave curing) 180 占 폚, 8 hours, 10 atm

Exemplary embodiment 1 of the exposed concrete panel manufactured according to the composition and conditions described above is capable of disassembling from a mold after an hour of pouring into a mixing and a mold, And shortening the demold time. In addition, in the case of Example 1, after 8 hours of autoclave curing, it was possible to apply immediately to the construction, while the conventional exposed concrete panel required at least 7 days of natural curing after demoulding. However, even after using the ordinary Portland cement, It was confirmed that the whiteness was excellent and it was easy to color, and there was no warping before and after the application, so that the defective construction can be prevented. In addition, the weathering resistance and waterproofing performance of Example 1 were improved by the osmotic pressure due to the deeper structure inside the concrete panel due to the osmotic pressure.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (6)

In the exposed concrete panel,
The present invention relates to a method for producing a primary mixture by mixing cement, silica flour, silica sand, cellulose fiber, gypsum, lime and water to form a primary mixture and mixing the primary mixture with aluminum oxide (Al ₂ O ₃ ) And water are mixed to form a secondary mixture, the secondary mixture is placed in a mold and cured at room temperature, and the cured product demolded from the mold is cured in an autoclave and cured. The autoclave curing exposed concrete panel. The method according to claim 1,
The primary mixture may contain,
Wherein the cement powder comprises 7 to 15 wt% of the cement powder, 8 to 16 wt% of the fine silica powder, 50 to 70 wt% of the silica powder, 2 to 6 wt% of the cellulose fiber, 0.8 to 1.6 wt% of the gypsum, And 5 to 15% by weight of the water,
Preferably,
No. 5 No. 6 and No. 6 No. 1 in the weight ratio of 1: 0.8 to 1.2,
The secondary mixture may contain,
Wherein the primary mixture comprises 70 to 85% by weight of the primary mixture, 5 to 12% by weight of the aluminum oxide, and 10 to 20% by weight of the water. The method according to claim 1 or 2,
The secondary mixture may contain,
Curing at 20 to 30 DEG C for 50 to 70 minutes in the mold,
The cured product,
Wherein the curing is carried out at 150 to 210 DEG C for 6 to 20 hours in the autoclave. A method of manufacturing an exposed concrete panel,
Forming a first mixture by mixing cement, silica flour, silica sand, cellulose fiber, gypsum, lime, and water;
Mixing the primary mixture with aluminum oxide (Al ₂ O ₃ ) and water to form a secondary mixture;
Placing the secondary mixture in a mold and curing at room temperature; And
Curing the cured product demolded from the mold in an autoclave;
Wherein the method comprises the steps of: The method of claim 4,
Wherein the primary mixture forming step comprises:
Wherein said primary mixture comprises 7 to 15 wt% of said cement, 8 to 16 wt% of said fine silica powder, 50 to 70 wt% of said silica fiber, 2 to 6 wt% of said cellulose fiber, 0.8 to 1.6 wt% of said gypsum, To 1.1% by weight of water and 5 to 15% by weight of water,
Wherein the above-mentioned silica sand has a weight ratio of 1: 0.8 to 1.2,
The second mixture forming step comprises:
Wherein the secondary mixture comprises 70 to 85% by weight of the primary mixture, 5 to 12% by weight of the aluminum oxide, and 10 to 20% by weight of the water. The method according to claim 4 or 5,
In the room temperature curing step,
The secondary mixture is cured in a mold at 20 to 30 DEG C for 50 to 70 minutes,
In the autoclave curing step,
Wherein the cured product is cured in an autoclave at 150 to 210 占 폚 for 6 to 20 hours.

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